Functional polyolefinic film

A functional polyolefinic(tubular) film combined with an inorganic filler (such as CaCO.sub.3) having a thickness of 5-150 .mu.m, which is applied in a corona discharge at a high voltage current of 50-3,000 W/m.sup.2 /min. A process for manufacturing that film. Products obtained from that film [packaging bag, adhesive-backed sheet and adhesive tape (such as tape for adhesive masking film for coating)].

BACKGROUND OF THE INVENTION 
1. Field of the Invention 
The present invention relates to a functional polyolefinic film. In more 
detail, it relates to a polyolefinic film, or a tubular film applied in 
corona discharge treatment at a high voltage current, which has not been 
proposed conventionally, and manufacturing method thereof, and bags for 
packaging, adhesive sheet and adhesive tape manufactured from their films. 
2. Description of the Prior Art 
In general, paper is opaque and weak against water, and also in mechanical 
strength but quite low in cost, hygroscopic, superior in touching, air 
permeability, moisture permeability, adhesive property, writing property 
and printing property and so on, in addition, easy to be torn by hand and 
good to recover as base material (hereinafter referred as 
"recoverability") and to be disposed (hereinafter referred as 
"disposability"), so that a large amount of paper has been used. On the 
other hand, polyolefinic film is superior in transparency, mechanical 
strength and water resistance, comparatively low in cost, and so that a 
large amount of the film is used also in a various fields, but not soft in 
touch, inferior in air permeability, moisture permeability and adhesive 
property and not easy to be torn by hand like in case of paper and 
inferior in base material recoverability and disposalability. That is, 
there have not existed such polyolefinic film such as having water 
resistance and being superior in touch, air permeability, moisture 
permeability, writing property and printing property. If such film as a 
polyolefinic film which has such properties of paper is developed, it can 
be not only for replacement with paper but also for a widely new use, in 
which a tearing property is needed but paper is not used therefor due to 
low water resistance. 
The object of the present invention is to provide the functional 
polyolefinic film or tubular film, which have not been proposed 
conventionally, being superior in touch, air permeability, moisture 
permeability, printing property, writing property and adhesive property 
like in paper, and easy to be torn by hand, resistance for water and 
chemicals, which means not broken with water and not deteriorated by being 
in contact with such as acid or alkali and good for disposability, and 
manufacturing method thereof and the products in which such materials are 
used. 
The present inventor has completed the invention relating to the 
manufacturing technique by applying a corona discharge on the inner 
surface of the polyolefinic tubular film to make a masking film, filed a 
patent application thereof and obtained a Japanese Patent under the number 
of 2,514,899. On the other hand, when developing this technique of the 
patent, he has found an outstanding result for solving the above 
conventional problems in case a specific condition of the corona discharge 
is applied and continued to study this technique and completed the present 
invention. 
SUMMARY OF THE INVENTION 
The present invention relates to a functional polyolefinic tubular film 
consisting of polyolefinic resin composition combined with inorganic 
filler which is 5-150 .mu.m in thickness and on either inner or outer 
surface, or on both surfaces of which a corona discharge is applied at a 
application power of 50-3,000 W/m.sup.2 /min. 
Further, the present invention relates to a functional polyolefinic tubular 
film consisting of polyolefinic resin composition combined with inorganic 
filler, on either inner or outer surface, or on both surfaces of which a 
corona dicharge is applied, is characterized in that at least one of 
physical property values of tearing strength, strength at rupture, 
elongation at rupture and shock strength after the corona discharge is 
applied is less than 70 as a relative value compared with 100 as the 
corresponding physical value taken before the corona dicharge treatment. 
Still further the present invention relates to a functional polyolefinic 
tubular film consisting of polyolefinic resin composition combined with 
inorganic filler, on either inner or outer surface, or on both surfaces of 
which a corona dicharge treatment is applied, is characterized in that one 
or both of physical property values of an air permeability and a moisture 
permeability after the corona discharge application is more than 300 as a 
relative value compared with 100 as the corresponding physical property 
value taken before applying the corona discharge. 
Further more details of the invention will be explained as follows. 
Provided that the physical property value (initial value) of the tubular 
film before the corona discharge application is settled as 100, the 
physical property value after applying the corona discharge, as to tearing 
strength, strength at rupture, elongation at rupture or shock strength, at 
least one of them, preferably plural values are less than 70, more 
preferably less than 60 and most preferably in particular less than 50. 
The lower limit of these physical property value is not determined in 
particular, as long as the aimed tubular film is obtained, it may be 
lower, but usually the lower limit is about 10. Further, in the case of 
the air permeability and the moisture permeability, provided that at least 
one of them, preferably both of them, is settled as 100 as initial value, 
it may be more than 300, more preferably more than 400 and most preferably 
more than 500. As to the upper limit of the physical properties value 
after the corona discharge application, as long as the aimed tubular film 
is obtained, it may be a higher value, but it is usually about 2,000. It 
is essential to make the physical property value of the tubular film after 
the corona charge treatment in order to obtain the tub ar film which is 
the purpose of the present invention. 
For reference, the measuring method of each physical property values are as 
follows. 
Tearing strength: JIS K7128, Process B (Elmendorf method) 
Strength at rupture: JIS K7127 
Elongation at rupture: JIS K7127 
Shock strength: ASTM D1709 
Air permeability: JIS P 8117 
Moisture permeability: JIS Z 0208 
In the preferable manner of the functional polyolefinic tubular film of the 
present invention, a polyolefinic resin composition containing at most 30 
parts by weight of styrene-butadiene co-polymer containing 65-85 wt % of 
styrene is used. In the preferable manner of the functional polyolefinic 
tubular film of the present invention, a polyethylenic resin containing at 
most 30 wt % of polypropylenic resin is used as polyolefinic resin. 
In another preferable manner of the functional polyolefinic tubular film, 
it is prepared in a form of roll to intend to make the product compact and 
improve the usability. When preparing the tubular film in a form of roll, 
it is carried out by being rolled up on a core in a flat form in the 
longitudinal direction. As a core material, a tubular body, for example, a 
paper tube, a plastic tube, a metal tube or a wood tube or the like, or a 
rounded bar (for example, a bar like solid cylinder) made of the above 
material. From the cost and functional viewpoint, the paper tube is 
preferable. Further, if it does not matter from manufacturing or using 
viewpoint, without using a core to prepare a roll, the above tubular film 
may be rolled up. 
Further, the functional polyolefinic tubular film of the present invention 
can be made flat and folded to make the film compact and intend to improve 
the usability. 
And, the present invention relates to a manufacturing method of a 
functional polyolefinic tubular film characterized in applying a corona 
discharge in application power of 50-3,000 W/m.sup.2 /min. on either inner 
or outer or both surfaces of a polyolefinic tubular film composition 
combined with an inorganic filler. 
In the present invention, the tubular film usually is manufactured by an 
inflation method, which may be carried out in air cooling or in water 
cooling. 
The thickness of the tubular film obtained by the above inflation method is 
preferably within the range of 5-150 .mu.m, preferably in particular it is 
within the range of 10-80 .mu.m. This is because, if the thickness is less 
than 5 .mu.m, it is too weak-kneed, and happens to become difficult in 
manufacturing, and if it is more than 150 .mu.m, the central portion in 
thickness direction of the film is hardly influenced by a high voltage 
current and it is hard to obtain a functional film to be attained by the 
present invention. 
In particular, when the thickness of the film is thin like in approximately 
10-30 .mu.m, the functional film is manufactured at a comparatively low 
treating power and promptly at low cost, which has the superior physical 
properties, that the present invention intends to obtain, such as the 
touching, the air permeability, the moisture permeability, the printing 
property, the writing property and the adhesive property and that the 
tearing becomes more easy and superior in water resistance and in 
resistance to chemicals. 
In the present invention, the corona discharge on the tubular film is 
carried out on either inner or outer, or both surfaces within a specific 
range by applying a high treating power of 50-3,000 W/m.sup.2 /min. If the 
treating power is less than 50 W/m.sup.2 /min., the functional film having 
the specific properties which the present invention intends can not be 
obtained, if it is more than 3,000 W/m.sup.2 /min., the lives of the 
electrode roll and the treatment roll become short and the film suffers 
from generating a lot of large holes, a film having even quality can not 
be obtained. And, the treating power shows the value which is given by 
dividing an electric capacity(W) indicated with a number of watt by the 
width (m) of the film to be treated and a film speed (m/min.), which 
indicates a unit of W/m.sup.2 /min. The power applied in the present 
invention is given by arranging appropriately the power and/or the film 
speed in accordance with the film width. For instance, compared with the 
normal corona discharge, if employing the followings such as approximately 
2-100 times of power, or approximately 0.01-0.5 times of film speed, the 
large amount of treating power of the present invention is applied. 
Further, it needs not to mention that, if it is possible to obtain a 
wished film, the treatment power may be of 50-3,000 W/m.sup.2 /min. by 
combining the power capacity other than the above with film speed. 
The corona discharge application on the inner surface of the tubular film 
can be carried out by applying the treating power of 50-3,000 W/m.sup.2 
/min. on the outer surface of the tubular film while contacting at least a 
pair of electrodes applied by a high voltage current with the outer 
surface of the film in the state keeping a space of 1-7 mm from the inner 
surface of the film running in the existence of a sealed gas such as air, 
nitrogen gas, argon gas, xenon gas or carbon dioxide. In a known corona 
discharge treatment, although merely 30-40 W/m.sup.2 /min. of high voltage 
current is applied, in the present invention, although the application 
power is varied in a high or low value according to the thickness of the 
polyolefinic film, in the case of a similar thickness at least 2 times of 
the treating power of normal corona discharge is applied, such powerful 
treating power has never been informed, for the first time it has been 
experimented and reported by the present inventor. Accordingly, the effect 
of such powerful application power of the present invention has not 
completely been expected. 
The corona discharge application on the outer surface of the tubular film 
is carried out by making the inner surface of the tubular film in running 
state tightly in contact with the inner surface right after being molded 
in an inflation method, or after being applied with the corona discharge 
application, and being applied by 50-3,000 W/m.sup.2 /min. of the 
application power on the outer surface keeping a gap of 1-3 mm between at 
least a pair of electrodes applied by a high voltage current. 
In the case, in the present invention, both surfaces of the tubular film 
are applied with the corona discharge, the treating power for a corona 
discharge may be same or different, if it is same, in the form of a flat 
film both surfaces of it show a homogeneous nature, on the contrary, if a 
different treating power is used, in the form of a flat film, both 
surfaces of the film can be different in the nature of wetting tension and 
so on. In the latter case, it is advantageous to differentiate the front 
and the back when using it in the case where the front and the back is 
needed to be differentiated. Further, when carrying out the corona 
discharge treatment, it does not matter which surface of the inner or 
outer first to be applied. 
In the present invention, polyolefinic resin includes a single polymer or a 
combination of more than one selected from the group of a high-pressure 
low-density polyethylene, an ethylene-vinyl acetate co-polymer, an 
ethylene-acrylic ester co-polymer, an ionomer, a high density 
polyethylene, a medium density polyethylene, a straight-chain low density 
ethylene-.alpha.-olefin co-polymer, a very-low density straight-chain 
ethylene-.alpha.-olefin co-polymer, a polyolefinic by metallocene 
catalyst, polypropylene, a polybutene-1, a poly-4-methylpentene-1. 
As the inorganic filler to be used in the present invention, calcium 
carbonate, talc, kaolin, diatomite, calcium sulfite, magnesium carbonate, 
barium carbonate, magnesium sulfite, barium sulfite, calcium sulfite, 
aluminum hydroxide, magnesium hydroxide, calcium oxide, magnesium oxide, 
zinc oxide, titanium oxide, clay, calcium silicate, hydrotalcite, silica, 
silica gel, alumina, alumina gel, zeolite, cristobalite, tourmaline, 
shirasu(volcanic ash), shirasu balloon, crinobutilite, Ohya-stone, kaolin, 
colloidal sulfur, ultramarine, chromium oxide, nickel oxide, wet ferric 
oxide (which is formed by blowing a gas containing oxygen such as air in a 
suspension including neutralization reaction precipitates between an 
aqueous solution of ferrous salt and an alkaline aqueous solution such as 
aqueous solution of the alkali carbonate while controlling the temperature 
at 20-70.degree. C. For example, goethite particle (.alpha.-FeOOH), 
lepidocrosite particle (.gamma.-FeOOH) or .delta.-FeOOH particle are 
mentioned. Configuration of the particles is like either one of a spindle, 
a needle or plate), particle of granular magnetite (which is formed by 
blowing a gas containing oxygen such as air in a suspension including 
neutralization reaction precipitates between an aqueous solution of 
ferrous salt and an alkaline aqueous solution such as aqueous solution of 
alkali hydroxide while controlling the temperature at 45-100.degree. C. 
For example, hematite (.alpha.-Fe.sub.2 O.sub.3) particle, magnetite 
(FeO.sub.x.Fe.sub.2 O.sub.3, 0&lt;x.ltoreq.1) particle or maghemite 
(.gamma.-Fe.sub.2 O.sub.3) particle are mentioned. Configuration of 
particles is like either one of a spindle, a needle, a plate, a sphere, an 
octahedron, a polyhedron or an amorphous and so on) are mentioned, and 
these can be used in single manner or in any combination manner of more 
than one. 
The inorganic filler to be used in the present invention is preferably 
treated in surface with any treatment agent in order to prevent it from 
being condensed, increase the dispersion to polyolefinic resin and 
increase its workability. As the agent for surface treatment, the 
followings are mentioned: silane coupling agent (for example, amino 
silane, me acryloxysilane, glycidoxysilane, mercaptosilane, vinyl silane 
and so on), aluminum coupling agent (for example, 
di-isopropoxy-aluminium-ethylacetoacetate, 
di-isopropoxy-aluminium-monometacrylate, aluminium-stearate-oxidetrimer, 
isopropoxy-aluminium-alkylacetoacetate-mono-di-octylphosphate and so on), 
titanate coupling agent (for example, isopropyl triisostearoyl titanate, 
isopropyl bis(di-octylphosphite) titanate, isopropyldodecylbenzene 
sulfonyl titanate and so on), aliphatic acid (for example, stearic acid, 
palmitic acid, myristic acid, lauric acid and oleic acid and so on), 
aliphatic acid metal salt (for example, sodium stearate, calcium stearate, 
sodium palmitate, calcium palmitate, sodium milistate, calcium milistate, 
sodium laurate, calcium laurate, sodium oleate and calcium oleate and so 
on) and fatty amide (for example, stearamide and oleamide and so on). 
The diameter of the particles of the inorganic filler combined in the 
polyolefinic resin in the present invention is preferably 0.1-20 .mu.m in 
average. This is because what is less than 0.1 .mu.m is liable to be 
aggregated and difficult to combine to polyolefinic resin, and what is 
more than 20 .mu.m in average diameter of the inorganic filler, a forming 
a film by inflation method becomes difficult and the surface property of 
the film happens to be deteriorated. 
In addition, the amount of volume to be combined of the inorganic filler is 
appropriately optional in accordance with the tubular film to attain, but 
normally it is 20-300 parts by weight to 100 parts by weight of 
polyolefinic resin. This is because, if the combined amount of the 
inorganic filler is less than 20 parts by weight, the function to be 
attained by the present invention, for example to obtain a property like a 
paper is difficult, and if it is more than 300 parts by weight, it is 
difficult to form the film by inflation, in addition the surface property 
of the thus obtained film happens to be deteriorated. 
The base material of the functional polyolefinic tubular film of the 
present invention is a resin composition consisting of the above 
polyolefinic resin and the inorganic filler, but when using a resin 
composition containing at most 30 parts by weight styrene-butadiene 
copolymer containing 65-85 wt % of styrene in addition to the above 
polyolefinic resin and the inorganic filler, a flexibility, an easy 
tearing property and an elongation at rupture are improved to approach to 
the paper property. 
And, when using a polyethylenic resin as a resin component, if a 
polyethylenic resin combined with at most 30 wt % of the polypropylenic 
resin i.e. a composition consisting of 70-100 wt % of polyethylene resin 
and 30-0 wt % of polypropylene resin is used, the obtained properties such 
as an easy tearing and a tensile strength are more improved to approach to 
the paper property. 
In the resin composition of the present invention, a 
biodegradation-imparting agent or a photodegradation-imparting agent may 
be combined. As the biodegradation-imparting agent, the followings can be 
mentioned, that is: a monosaccharide such as glucose, galactose, mannose 
and fructose, a disaccharide such as maltose, lactose and sucrose, a 
polysaccharide such as starch, dextrin, cellulose, inulin, agarose, 
fructan, an amino sugar such as chitin, chitosan, amikacin, sisomicin, a 
reducing sugar such as aldose, ketose and heptose and an sugar alcohol 
such as tetritol and pentitol. The starch or its derivatives which are 
easy to be available and low in cost are easy to manufacture the film 
involving such materials with a higher function, and preferable in the 
property of biodegradation-imparting agent. 
Further, as a starch or its derivatives, for instance, the starch obtained 
from Indian corn, potato, rice, sweet potato and wheat and so on, or the 
starch grafted with polymerizable monomer, the starch coated with silicone 
and so on or starch derivatives, such as modified starch which contains as 
main ingredients sugars such as glucose, molasses or casein sugar, and 
which is modified with organic material which is liable to be eaten by any 
organisms. 
In the present invention, the combination amount of the 
biodegradation-imparting agent to a resin composition is not limited in 
particular, however it varies greatly depending on the kind of the 
biodegradation-imparting agent to be used or the use of the film to be 
used, and usually the biodegradation-imparting agent is combined by the 
amount of 1-80 wt % preferably 5-70 wt % of 100 wt % of the composition 
including polyolefinic resin. 
In particular, in the case starch or its derivatives are combined as the 
biodegradation-imparting agent, the combination amount thereof is 5-70 wt 
% preferably 6-50 wt %, in particular preferably 7-20 wt % of 100 wt % of 
the composition including polyolefinic resin. If the amount of the starch 
or its derivatives is more than 5 wt %, according to the increased amount 
the biodegradation property is increased, and if it is more than 70 wt %, 
the physical property of polyolefinic resin is decreased outstandingly to 
cause it as the film to become inappropriate in actual use. 
Further, by the combination of the photodegradation-imparting agent i.e. an 
additive generally calied as a photosensitive reagent, such as a light 
sensitizer having a carbonyl group (benzophenone, acetophenone, 
anthroquinone etc.) or metallic compound (such as metallic salts of 
organic acid), in addition to the biodegradability, the photodegradability 
is added, so that the decomposition of the film can be promoted after 
disposal. Further, when containing such photodegradation-imparting agent 
which may decompose the films when the films are abolished in soil or 
water, even if there is little microorganisms in the soil or water into 
which the films are abolished, or the abolished films are come out of the 
soil or water, the decomposition of the films are promoted rapidly. For 
that purpose, in the preferable manner of embodiment, the tubular film is 
manufactured from the resin composition combined with the 
photodegradation-imparting agent in addition to the 
biodegradation-imparting agent. 
As the concrete example one or a combination of at least two selected from 
the followings is mentioned: ferrous diethyl-dithiocarbamate, manganese 
diethyl-di-thiocarbamate, zinc dibutyl-di-thiocarbamate, zinc 
di-isopropyl-di-thiophosphate, 1,4-benzoquione, benzylidenephthalide, 
.beta.-[cyanobenzyliden] phtharide, 
N-o-phenyl-3-benzylidenephthaloimidine, anthraquinone and its derivatives, 
benzophenone and its derivatives, benzotriazole and its derivatives, 
1,2-dibenzoylethylene, dibenzoylbenzene, ditoluylbenzene, indandione, 
indanone, coumaranone, aliphatic acid metallic salt (for example: cobalt 
acetate, nickel acetate, nickel laurate, copper stearate acid, ferric 
stearate, zinc stearic acid), iron acetyllactonate, 
2-hydroxy-4-octyloxylbenzophenone and so on. 
The combined amount of the photodegradation-imparting agent may be 
different depending on the photodegradability intended, however usually it 
is combined in such a manner that of 100 wt % of a composition with 
polyolefinic resin 0.2-10 wt %, preferably 0.5-10 wt % of 
photodegradation-imparting agent may be included. 
And, by adding autooxidation agent, oxidized oil or metallic salts, 
metallic oxide or metallic hydroxide and so on besides 
biodegradation-imparting agent and photodegradation-imparting agent, it is 
further promoted to decompose the films in soil or water. It is a matter 
of course to carry out a combination of other additives within the range 
wherein the object of the present invention may not be lost. 
As autooxidation agent, substances to promote the oxidative destruction of 
the polyolefinic resin having carbon-carbon double bond, such as oleic 
acid or ester thereof and so on, as oxidized oil, oxidized animal oil 
(such as tallow, lard, milk fat) and oxidized vegetable oil (such as 
rape-seed oil, corn oil, sunflower oil, safflower oil) and as metallic 
salts, metallic oxides or metallic hydroxides such as inorganic acid salts 
(such as sulfite, hydrochloride, carbonate) or organic acid salts (such as 
carboxylate), oxide, or hydroxides of sodium, potassium, calcium, 
magnesium, zinc, aluminium, manganese or iron are mentioned. 
Further, the resin composition to be manufactured as the tubular film of 
the present invention may be combined with the biodegradation plastics 
and/or the photodegradation plastics. As the biodegradation plastics; 
polycaprolactone, aliphatic acid polyester such as poly (lactic acid), 
poly (glycol acid) or poly(hydroxybutylate), aliphatic polyestercopolymer, 
polyurethane resin, polyamide resin, polyvinylalcohol, polyether such as 
polyethyleneglycol or polypropyleneglycol, as the 
photodegradation-plastics; ethylene-carbon monoxide copolymer, polyketone 
such as vinylketone copolymer are mentioned. 
The present invention also relates to such functional polyolefinic film as 
mentioned below. 
A film applied with a corona discharge at an treating power of 50-3,000 
W/m.sup.2 /min. on at least one side of the film being made of 
polyolefinic resin composition combined with an inorganic filler and 
having 5-150 .mu.m in thickness. 
A film applied with a corona discharge on at least one side of the film 
being made of polyolefinic resin composition combined with an inorganic 
filler, at least one of the physical properties of a tearing strength, a 
strength at rupture, an elongation at rupture or a shock strength after 
the corona discharge application is less than 70 comparing to the 
corresponding physical property value as 100 of the film just before the 
corona discharge application. 
A film applied with a corona discharge on at least one surface of the film 
being made of polyolefinic resin composition combined with an inorganic 
filler, one or both physical property values of an air permeability or a 
moisture permeability after the corona discharge application is more than 
300 as relative value comparing to the corresponding value as 100 of the 
film just before the corona discharge application. For reference, all of 
the examples and the preferable manners of the above mentioned substances 
or processes to the functional polyolefinic tubular film of the present 
invention can be adapted similarly to the functional polyolefinic film of 
the present invention. The functional polyolefinic film according to the 
present invention can be processed by applying the corona discharge on at 
least one surface of the film consisting of the polyolefinic resin 
composition combined with an inorganic filler at the power of 50-3,000 
W/m.sup.2 /min. 
Concretely, after applying a corona discharge at a given power, the 
functional polyolefinic film according to the present invention can be 
manufactured by cutting a tubular film at any portion perpendicular to the 
longitudinal direction, or by applying a corona discharge at a given power 
to a plain sheet-like film opened from a tubular film or to an originally 
formed sheet-like film. 
Further, the functional polyolefinic film of the present invention, which 
forms an approximately square shape, rectangular shape or band-like, can 
intend to make it compact or increase the way of how to use it by rolling 
it on a tubular body or bar to form a roll or folding it. 
The functional polyolefinic film and the tubular film have a various uses, 
but above all, the present invention relates to a packaging bag which is 
formed by cutting the functional polyolefinic tubular film by a given 
length perpendicular to the longitudinal direction of the tube and 
heat-sealing one opening. Accordingly, the above heat-sealed portion forms 
a bottom portion of the bag and the given length at the time of cutting 
becomes a height of the bag. 
The functional polyolefinic film of the present invention can be used 
preferably as a base material of an adhesive-backed sheet or adhesive 
tape. Accordingly, the present invention relates to an adhesive-backed 
sheet which is formed by applying an adhesive on one or both surfaces of 
the functional polyolefinic film, or an adhesive tape which is formed by 
applying an adhesive on one or both surfaces of the functional 
polyolefinic film cut by a given width. 
In the adhesive-backed sheet or adhesive tape, the support member may be a 
type of one-sided adhesive, in which one surface is applied with an 
adhesive and the opposite surface is applied with a release medium or a 
type of both-sided adhesive in which both surfaces are applied with an 
adhesive. In the case of the latter i.e. both-sided adhesive, one of the 
both sides is layered with a release sheet. And, in the case of former 
i.e. one side adhesive, a release agent may happen to be omitted. 
The adhesive tape according to the present invention can be made use of 
preferably the object to be coated by applying it as a masking film for 
coating. In a preferable case where the adhesive tape of the present 
invention is applied to a masking film for use of coating, the above 
mentioned adhesive tape of the present invention is adhered on at least 
one portion of the edge area of the masking film (for instance, 
polyolefinic film) leaving an un-adhered portion. 
Also, the functional polyolefinic tubular film of the present invention can 
be used as a masking film itself for use of coating. 
The functional polyolefinic tubular film and the functional polyolefinic 
film of the present invention are a completely new type of film which is 
very similar in paper natures such as air permeability, moisture 
permeability, susceptibility to water, hygroscopicity, printing property, 
flexibility, coating ability, writing ability and adhesive property, near 
to the values of paper nature in connection with the strength such as the 
tensile strength and the tearing strength, which paper has, easy to break 
or tear it by hand, in addition superior in the properties of such as 
water resistance and chemical resistance and preferable in treatment for 
disposal. 
Therefore, it needs not to mention as a replacement of a paper, and it is 
used as replacements of such as non-woven, woven fabrics and clothes, for 
instance, for use of packages (bags, boxes, envelopes) for cookies, 
fruits, vegetables, corns, fishery products, miscellaneous goods, 
clothing, books, toys, tools, CDs, CD-ROMs, floppy discs, stationery, 
mechanical parts and electronic parts, also for use of protective sheet 
(film), or for use of provisional adhering sheet (film) and for use of 
base material for adhesive-backed sheet and adhesive tape. 
In addition, since the above film of the present invention is superior in 
printing property and writing property, it can be used for a replacement 
of normal paper, in particular of a synthetic paper. 
Further, since the present invention has air permeability, moisture 
permeability and light intercepting property, it can be used as packaging 
paper, paper for Shoji, house film for agriculture, mulching film for 
agriculture, light intercepting bag for fruits, protecting film or masking 
film and so on. 
Other than the above, since the film of the present invention has the above 
superior properties, it can be used as sheets for construction (for 
instance, such as moisture preventing sheet) or wall papers. In 
particular, adhesive-backed sheet (film) and adhesive tape are what the 
nature of the functional polyolefinic film of the present invention is 
maximally utilized. 
Since the adhesive-backed sheet and a sive tape are adhered on the plates 
of such as glass, metals, stones, plastics, woods and protects them, it is 
preferably used for adhering things such as baggages, corrugated boards, 
boxes, papers, plastics, fabrics, woods, metals and ceramics. In 
particular, the adhesive-backed sheet is used as dust-taking off roll and 
the adhesive tape is used as tape for adhering masking film, for adhering 
paper diaper, kraft tape or gum tape for packaging. The masking film for 
coating which is adhered by the adhesive tape of the present invention is 
used for instance for coating automobiles, buildings, roads, exercise 
field (stadium), parking areas and vehicles.

EMBODIMENT 
Next, although the present invention is explained in detail based on the 
embodiment illustrated, it is not limited to this explanation. 
Manufacturing Example No. 1 of tubular film 
100 parts by weight of linear chain ethylene-butene-1 copolymer prepared in 
a low pressure vapor phase method at 0.920 g/ml density, 1.0 g/10 min. 
melt index, and 70 parts by weight of calcium carbonate (the surface is 
treated by sodium stearate) having particle dia. in 2 .mu.m in average are 
heated and kneaded at 180.degree. C. for 20 minutes in a Banbury mixer to 
obtain a resin composition. It is excluded from a circular die at 
180.degree. C. and obtained a tubular film by an air cooled inflation 
method having the thickness of 10 .mu.m and 30 cm of flat width. 
Keeping the inside gap of the tubular film in 1.8 mm, while sealing air 
inside, and keeping the running speed of the film at 15 m/min., using a 
corona discharge instrument (made by Kasuga Denki), it is applied at 30 
kHz frequency and the application power of 85 W/m.sup.2 /min. 
Then, it is made running at the speed of 15 m/min. while keeping contact 
the inner surfaces of the tubular film tightly, and then while keeping the 
gap between an electrode and the film in 1.8 mm, and using a film outer 
surface corona discharge application instrument (made by Kasuga Denki), it 
is applied at 30 kHz frequency and the application power of 85 W/m.sup.2 
/min. 
Thus processed films are measured of each physical property value and the 
results are compared with each of the initial value. 
Tearing strength: JIS K7128, Process B (Elmendorf method) 
Strength at rupture: JIS K7127 
Elongation at rupture: JIS K7127 
Shock strength: ASTM D1709 
Air permeability: JIS P 8117 
Moisture permeability: JIS Z 0208 
The obtained film was 60% of the initial value of the tearing strength 
(vertical direction: 7.2 g), 54% of the initial value of the strength at 
rupture (vertical direction: 0.41 kg/25 mm), 83% of the initial value of 
the elongation at rupture (vertical direction: 365%), 26% of the initial 
value of the shock strength (28 g/26 inches height), 5 times of the 
initial value of the air permeability (26 sec/100 cc), 8 times of the 
initial value of the moisture permeability (16,000 g/m.sup.2 for 24 hrs), 
and easily torn by hands, sufficient for permeability in air and moisture, 
so that the nature of the film was to be said similar to paper. 
Comparative example in manufacturing the tubular film 
In the manufacturing example 1, the corona discharge treatment was carried 
out on both inner and outer surfaces, at the application power of 20 
W/m.sup.2 /min., which is to be carried out for improving a normal surface 
wetting tension, the values of the tearing strength, strength at rupture, 
elongation at rupture, shock strength, air permeability and moisture 
permeability were all appropriately same with the initial value 
respectively and the functional polyolefinic film similar to the nature of 
paper was not obtained. 
Manufacturing example 2 of the tubular film 
100 parts by weight of high density polyethylene at 0.950 g/ml density, 2.0 
g/10 min. melt index, 20 parts by weight of magnetite 
(FeO.sub.0.5.Fe.sub.2 O.sub.3) having particle dia. in 0.3 .mu.m in 
average and 20 parts by weight of barium sulfate (the surface is treated 
with sodium stearate) having particle dia. in 15 .mu.m in average are 
heated and kneaded at 180.degree. C. for 20 minutes in a Banbury mixer to 
obtain a resin composition. It is excluded from a circular die at 
180.degree. C. and obtained a tubular film having the thickness of 20 
.mu.m and 50 cm of flat width at 3.5 blow ratio and a winding speed of 80 
m/min. by an air cooled inflation method. Keeping the inside gap of the 
tubular film in 2.5 mm, while sealing air inside, and keeping the running 
speed of the film at 30 m/min., using a corona discharge instrument (made 
by Kasuga Denki), it is applied at 20 kHz frequency and the treating power 
of 300 W/m.sup.2 /min. Then, it is made run at the speed of 30 m/min., 
while keeping contact the inner surface of the tubular film tightly, and 
then while keeping the gap between an electrode and the film in 2.5 mm, 
and using a film outer surface corona discharge application instrument 
(made by Kasuga Denki), it is applied at 20 kHz frequency and the 
application power of 300 W/m.sup.2 /min. 
The obtained film was 72% of the initial value of the tearing strength 
(vertical direction: 18.5 g), 63% of the initial value of the strength at 
rupture (vertical direction: 0.87 kg/25 mm), 73% of the initial value of 
the elongation at rupture (vertical direction: 387%), 41% of the initial 
value of the shock strength (36 g/26 inches height), 3.6 times of the 
initial value of the air permeability (58 sec/100 cc), 5.4 times of the 
initial value of the moisture permeability (10,800 g/m.sup.2 for 24 hrs), 
and easily torn by hands, sufficient for permeability in air and moisture, 
so that the nature of the film was to be said similar to paper. 
Manufacturing example 3 of the tubular film 
100 parts by weight of ethylene-vinyl acetate copolymer containing 18 wt % 
of vinyl acetate at 0.935 g/ml density, 3.2 g/10 min. melt index, 20 parts 
by weight of starch particle of indian corn and 30 parts by weight of 
zeolite having particle dia. in 5 .mu.m in average are heated and kneaded 
at 180.degree. C. for 20 minutes in a Banbury mixer to obtain a resin 
composition. It is excluded from a circular die at 170.degree. C. and 
obtained a tubular film having the thickness of 80 .mu.m and 80 cm of flat 
width at 3.2 blow ratio and a winding speed of 50 m/min. by an air cooled 
inflation method. Keeping the inside gap of the tubular film in 2.5 mm, 
while sealing air inside, and keeping the running speed of the film at 20 
m/min., using a corona discharge application instrument (made by Kasuga 
Denki), it is applied at 15 kHz frequency and the application power of 
1,200 W/m.sup.2 /min. Then, it is made run at the speed of 20 m/min. while 
keeping contact the inner surfaces of the tubular film each other tightly, 
and then while keeping the gap between an electrode and the film in 2.5 
mm, and using a film corona discharge application instrument (made by 
Kasuga Denki), it is applied at 15 kHz frequency and the application power 
of 1,200 W/m.sup.2 /min. 
The obtained film was 47% of the initial value of the tearing strength 
(vertical direction: 38.1 g), 58% of the initial value of the strength at 
ruptured vertical direction: 1.26 kg/25 mm), 67% of the initial value of 
the elongation at rupture (vertical direction: 425%), 55% of the initial 
value of the shock strength (47 g/26 inches height), 7.2 times of the 
initial value of the air permeability (287 sec/100 cc), 6.7 times of the 
initial value of the moisture permeability (8,900 g/m.sup.2 for 24 hrs), 
and easily torn by hands, sufficient for permeability in air and moisture 
and sufficient flexibility, so that the nature of the film was to be said 
similar to paper. Further, after this film was buried in soil for three 
months, strength at rupture lowered by 15.7% of the above initial value to 
show a sufficient biodegradability. 
Manufacturing example 4 of the tubular film 
100 parts by weight of ethylene-ethyl acrylate copolymer containing 12 wt % 
of ethyl acrylate at 0.940 g/ml density, 2.8 g/10 min. melt index, 30 
parts by weight of polycaprolactone and 245 parts by weight of 
cristobalite particle having particle dia. in 10 .mu.m in average are 
heated and kneaded at 180.degree. C. for 20 minutes in a Banbury mixer to 
obtain a resin composition. It is excluded from a circular die at 
165.degree. C. and obtained a tubular film having the thickness of 130 
.mu.m and 100 cm of flat width at 2.7 blow ratio and a winding speed of 40 
m/min. by an air cooled inflation method. 
Keeping the inside gap of the tubular film in 6.0 mm, while sealing air 
inside as a sealed gas, and keeping the running speed of the film at 10 
m/min., using a corona discharge application instrument (made by Kasuga 
Denki), it is applied at 8 kHz frequency and the application power of 
2,800 W/m.sup.2 /min. Then, it is made run at the speed of 10 m/min. while 
keeping contacting the inner surfaces of the tubular film each other 
tightly, and then while keeping the gap between an electrode and the film 
in 3.0 mm, and using a film corona discharge application instrument (made 
by Kasuga Denki), it is applied at 8 kHz frequency and the application 
power of 2,800 W/m.sup.2 /min. 
The obtained film was 48% of the initial value of the tearing strength 
(vertical direction: 87 g), 56% of the initial value of the strength at 
rupture (vertical direction: 1.89 kg/25 mm), 73% of the initial value of 
the elongation at rupture (vertical direction: 215%), 47% of the initial 
value of the shock strength (63 g/26 inches height), 6.1 times of the 
initial value of the air permeability (6,350 sec/100 cc), 4.3 times of the 
initial value of the moisture permeability (1,230 g/m.sup.2 for 24 hrs), 
and easily torn by hands, sufficient for permeability in air and moisture 
and sufficient flexibility, so that the nature of the film was to be said 
similar to paper. 
Further, after this film was buried in soil for three months, strength at 
rupture was lowered by 7.2% of the above initial value (vertical 
direction: 1.89 kg/25 mm) to show sufficient biodegradability. 
Manufacturing example 5 of the tubular film 
In the manufacturing example 2, the same processes as well as the 
manufacturing example 2 are followed other than the further combination of 
15 parts by weight of styrene-butadiene co-polymer containing 70 wt % of 
styrene and 30 wt % of butadiene (melt index 0.9 g/10 min., trade name 
K-resin made by Philips). The obtained film was 53% of the initial value 
of the tearing strength (vertical direction: 13.8 g), 41% of the initial 
value of the strength at rupture (vertical direction: 0.65 kg/25 mm), 65% 
of the initial value of the elongation at rupture (vertical direction: 
395%), 36% of the initial value of the shock strength (28 g/26 inches 
height), 5.4 times of the initial value of the air permeability (68 
sec/100 cc), 7.6 times of the initial value of the moisture permeability 
(9,800 g/m.sup.2 for 24 hrs), and easily torn by hands, sufficient for 
permeability in air and moisture with increased flexibility, so that the 
nature of the film was to be said similar to paper. 
Manufacturing example 6 of the tubular film 
100 parts by weight of a resin composition consisting of 85 wt % of high 
density polyethylene at 0.950 g/ml density, 2.0 g/10 min. melt index and 
15 parts by weight of polyplopylene at 0.90 g/ml density, 9 g/10 min. melt 
flow rate (230.degree. C. ) and 70 pats by weight of calcium carbonate 
having particle dia. 2 .mu.m in average are heated and kneaded at 
180.degree. C. for 20 minutes in a Banbury mixer to obtain a resin 
composition. It is excluded from a circular die at 180.degree. C. and 
obtained a tubular film having the thickness of 10 .mu.m and 30 cm of flat 
width at 3.5 blow ratio and a winding speed of 80 m/min. by an air cooled 
inflation method. 
Keeping the inside gap of the tubular film in 1.8 mm, while sealing air 
inside as a sealed gas, and keeping the running speed of the film at 15 
m/min., using a film inner surface corona discharge application instrument 
(made by Kasuga Denki), it is applied at 30 kHz frequency and the 
application power of 85 W/m.sup.2 /min. 
Then, it is made run at the speed of 15 m/min. while keeping contact the 
inner surfaces of the tubular film each other tightly, and then while 
keeping the gap between an electrode and the film in 1.8 mm, and using a 
film cuter surface corona discharge application instrument (made by Kasuga 
Denki), it is applied 30 kHz frequency and the application power of 85 
W/m.sup.2 /min. 
The obtained film was 35% of the initial value of the tearing strength 
(vertical direction: 3.7 g), 41% of the initial value of the strength at 
rupture (vertical direction: 0.26 kg/25 mm), 52% of the initial value of 
the elongation at rupture (vertical direction: 341%), 14% of the initial 
value of the shock strength (17 g/26 inches height), 8 times of the 
initial value of the air permeability (18 sec/100 cc), 13 times of the 
initial value of the moisture permeability (28,000 g/m.sup.2 for 24 hrs), 
and easily torn by hands, sufficient for permeability in air and moisture, 
so that the nature of the film was to be said similar to paper. 
Manufacturing example 7 of the tubular film 
In the manufacturing example 1 of the tubular film, the order of the corona 
discharge to the inner or outer surface is reversed, that is, after 
application on the outer, the inner surface treatment was carried out, the 
other processes were carried out as well as in the example 1, then the 
functional polyolefinic film having approximately same physical properties 
similar to the example 1 were obtained. 
Manufacturing Example 8 of tubular film 
100 parts by weight of linear chain ethylene-butene-1 copolymer prepared in 
a low pressure vapor phase method at 0.920 g/ml density, 1.0 g/10 min. 
melt index, and 70 parts by weight of calcium carbonate (the surface is 
treated by sodium stearate) having particle dia. in 2 .mu.m in average are 
heated and kneaded at 180.degree. C. for 20 minutes in a Banbury mixer to 
obtain a resin composition. It is excluded from a circular die at 
180.degree. C. and obtained a tubular film having the thickness of 10 
.mu.m and 30 cm in flat width at 3.0 blow rate and a winding speed of 60 
m/min. by an air cooled inflation method. 
Keeping the inside gap of the tubular film in 1.8 mm, while sealing air 
inside as a sealed gas, and keeping the running speed of the film at 15 
m/min., using a film inner surface coroa discharge application instrument 
(made by Kasuga Denki), it is applied at 30 kHz frequency and the 
application power of 150 W/m.sup.2 /min. 
The obtained film was 66% of the initial value of the tearing strength 
(vertical direction: 7.2 g), 59% of the initial value of the strength at 
rupture (vertical direction: 0.41 kg/25 mm), 89% of the initial value of 
the elongation at rupture (vertical direction: 365%), 30% of the initial 
value of the shock strength (28 g/26 inches height), 4.5 times of the 
initial value of the air permeability (26 sec/100 cc), 7.2 times of the 
initial value of the moisture permeability (16,000 g/m.sup.2 for 24 hrs), 
and easily torn by hands, sufficient for permeability in air and moisture, 
so that the nature of the film was to be said similar to paper. Since this 
film is treated by corona discharge merely on the inner surface, by 
developing that film, a sheet-like film, merely one side surface of which 
is applied by a corona discharge is obtained. That sheet-like film can be 
easily differentiated in front and back, and by applying an adhesive layer 
on the surface applied by a corona discharge, without applying a release 
agent on the other surface an adhesive-backed sheet or adhesive tape is 
obtained. 
Packaging bag manufacturing example 
By cutting the tubular film obtained in the manufacturing example 4 in a 
length of 50 cm each and the bottom portion was sealed by heat to obtain a 
packaging bag. In this bag 20 kg of brocoli was packed and the opening was 
sealed by heat, and observed it for 4 days at 15.degree. C. and was found 
that the freshness of the content was kept. Accordingly, it was found that 
this packaging bag is effective as freshness keeping film. 
Manufacturing example of functional polyolefinic film 
By flatting the tubular film obtained from the manufacturing example 1 and 
cutting it at both edges in the longitudinal direction with a razor to 
obtain two sheets of long films, and each of sheets is wound around a 
paper cylinder to obtain a roll. A plain film having a length of 100 cm 
and a width of 30 cm was obtained from the roll. When using this film as a 
mulching film, it is recognized that growth of the needs are delayed. 
Example of manufacture of adhesive-backed sheet 
By cutting the tubular film obtained by the manufacturing example 2 in 
longitudinal direction in parallel at one side with a razor and developing 
the same to obtain a flat sheet. Then, by cutting it perpendicularly to 
the longitudinal direction in the length of 300 cm to obtain a sheet film 
having a rectangular shape of 100 cm.times.300 cm. On one surface thereof 
an adhesive was applied with an acrylic adhesive and on the other surface 
a silicone release agent is applied to obtain an adhesive-backed sheet. 
This adhesive-backed sheet was adhered on both sides of a glass of 3 cm 
thickness to protect the glass. This glass plate was not hurt on the 
surface during displacement in a warehouse or transportation with 
vehicles. Used sheets were burnt in the combustion furnace to find that 
those were completely burnt out under the condition of low temperature and 
oxygen concentration. 
For reference, the adhesive-backed sheets are prepared intending these 
sheet to be overlapped in plurality for stock before use, so that one side 
thereof is applied by a release agent, however if it is stocked 
individually until its use, there is no need of applying a release agent. 
Example for manufacturing adhesive tape 
The tubular film obtained by the manufacturing example 5 was cut in the 
longitudinal direction in parallel at both sides with razor to obtain two 
sheets of plain film having width of 50 cm. On the surface of these films 
a release agent containing long chain alkyl pendant type polymer as main 
ingredient was applied, on the back surface an adhesive containing 
polystyrene-polyisoprene-polystyrene-block copolymer and petroleum resin 
as a main ingredient was applied and thus obtained sheets were wound on a 
paper cylinder, which was cut off at every 3 cm width to obtain a 
plurality of adhesive tapes. 
This adhesive tape is easy to cut by hands and very convenient when using. 
This adhesive tape was applied as fixing a floor seal sheet on a floor. In 
this case, since the tape is easy to be cut by hands, working efficiency 
was outstandingly improved. In addition, since the surface of the base 
material for the adhesive tape is applied powerfully by corona discharge , 
a free energy on the surface of the base material is very large as 60-70 
erg/cm.sup.2, plural convexes and concaves are generated on the surface of 
the base material and the bonding strength between the base material and 
the release agent or the adhesive agent is great, so that the release 
agent or the adhesive agent is kept stable without peeling off from the 
surface of the base material. And, when peeling off the adhesive tape from 
the objects, there remains no adhesive thereon. 
Example for manufacturing masking film 
The corona discharge treatment was applied on the back surface of a high 
density polyethylene film having 10 .mu.m in thickness, 100 cm in width 
and 50 cm in length, and the wetting tension was arranged as 45 dyn/cm. 
And, to one end in the longitudinal direction, an adhesive tape 
manufactured in the above mentioned manufacturing example was applied 
becomes opposite (overlapped) to the corona discharge applied surface of 
the film to obtain a masking film for coating. 
This masking film was applied to an iron plate standing vertically in such 
a manner as the portion of the adhesive tape was located above and the 
tape itself was positioned laterally 30 cm in length, and the remaining 
tape was cut off. When a red acrylic coating material was applied on that 
film, the coating material was applied evenly on the film without any 
trouble, and there was no dropping of the coating material. The masking 
film and the adhesive tape were bonded rigidly and the adhesive layer of 
the adhesive tape also was also rigidly bonded to the supporting member 
without peeling off. 
Use examples as film with the air and moisture permeability 
The air permeability and the moisture permeability of the film prepared in 
the manufacturing example 4 are measured. 
Air permeability: 1,040 sec/100 cc 
Moisture permeability: 5,289 g/m.sup.2 .multidot.24 hrs 
Thus, in the present invention, although the film is not elongated, it has 
an air permeability and a moisture permeability equal to a normal 
elongated film for use of baby's nappy holder, and has become obvious that 
the touch is better than the conventional film for use of baby's nappy 
holder. Further, from this film, a simple rain coat is manufactured and 
tried it on actually, there was no becoming stuffy and kept in shape and 
strength even in wetting without becoming softened. Further, in use of an 
air permeable bag for accommodating a heating agent for a throwaway body 
warmer, there was ample air permeability and heat transmissibility. 
Effect of the Invention 
Now, the effects derived from the present invention are described 
hereinafter. 
As mentioned above, the functional polyolefinic tubular film and the 
functional polyolefinic film of the present invention are what are 
obtained after being applied by the strong corona discharge, which was at 
least two times compared with the conventional one and has never been 
carried out for such a film, so that the following effects, which have 
never been realized hitherto, are derived. 
(a) Since the tearing strength and the tensile strength are lowered, which 
is easy to tear by hand, so that the products prepared from this film are 
easy to be torn without using such as cutters, accordingly working 
efficiency is superior. In particular, in the case of the tape, it is 
superior in being torn laterally. 
(b) The outer look and the touch are paper-like, it is used not only as a 
replacement of paper but also as the replacements of non-woven fabrics, 
fabrics and cloth. 
(c) Since the degree of the air and moisture permeability is large, the 
usages for what are requested to be air permeable or moisture permeable, 
for such as baby's nappy holder, packaging bags for keeping freshness and 
simple rain coat are widely arranged. 
(d) In addition to the paper-like touch and easy tearing strength, air and 
moisture permeability, the properties, which are inferior as paper, such 
as water resistance and resistance against chemicals are superior, so that 
it functions as supplementally to defects of paper. And, for use of what 
are not used because of the inferiority of the water resistance and 
resistance against chemicals, such as throwaway gloves and various kind of 
labels for chemicals, it can be used. 
(e) Comparing to a normal polyolefinic film, since it is outstandingly 
improved in disposal of waste, after use, the environmental contamination 
does not occur, and that the biodegradability or photodegradability is 
easily given, which causes to exist tender to the environment. 
(f) By selecting the kinds of the ingredient which are combined, their 
ratios or the tension of the corona discharge application, the control for 
the transparency, the degree of whiteness, mechanical strength or 
combustibility is easily carried out. 
(g) Since many fine convexes or concaves are formed on the surface of the 
film, the touch is quite similar to paper. 
(h) Since the free energy on the surface of the film is quite large, it is 
greatly of affinity with water, coating material, ink and chemical, so 
that it is quite similar to the nature of paper, which can supplement the 
defects of the conventional polyolefinic film with respect to printing 
property and writing property. 
(i) Since the surface of the film is activated and provided with a lot of 
fine convexes and concaves, the bonding strength with the adhesive or the 
release agent is quite large, if used as support member of adhesive-backed 
sheet or adhesive tape, there is no peeling off of the release agent at 
the time of using, and the bonding strength to the object to be adhered is 
superior, in addition there is no adhesive left after peeling off. 
(j) As the raw material, it uses the polyolefinic resin and the inorganic 
filler, it can be manufactured at the cost lower than paper. 
Further, according to the manufacturing method of the functional 
polyolefinic tubular film or the functional polyolefinic film of the 
present invention, the tubular film or the film having the above superior 
properties are manufactured easily by making use of the conventionally 
existing apparatus at low cost. In addition, the products including such 
as packaging bag or other products derived from the tubular film of the 
present invention also providing the such superior properties as paper 
has, i.e. superior touch like paper, air permeability, moisture 
permeability, writing property, printing property, adhesive property, easy 
tearing property, the superior water resistance and the resistance against 
chemicals, in addition, appropriate waste treating property, so that these 
films can be used in a variety of fields such as, for instance, packaging 
bags, films for agriculture, films for construction (for instance: 
moisture preventing sheets and so on), adhesive-backed sheet, adhesive 
tape, provisional protecting film, masking film for coating, incombustible 
sheet, table cloth, floor cloth, envelope, bag for medicine, shopping bag, 
paper for poster, paper for calender, stationery, wall material, sheets, 
cloth, hats, sports goods, instruments for amusement and tape.