Anti-static jacket for floppy disk

According to the invention a jacket for floppy disk is provided. The jacket comprises an exterior layer and an interior layer. The exterior layer is made of an antistatic styrene base resin composition. The interior layer is a non-woven cloth layer.

BACKGROUND OF THE INVENTION 
1. Field of the Invention 
The present invention relates to a jaceket for containing therein a floppy 
disk. 
2. Related Art Statement 
The conventional jacket for floppy disks is generally manufactured by 
bonding a non-woven cloth to a sheet mainly composed of a hard 
polyvinylchloride followed by cutting and folding operations. The heat 
distortion temperature thereof is 60.degree. to 70.degree. C., at most, 
since it is mainly composed of a polyvinylchloride. For this reason, if 
the non-woven cloth is laminated at a high temperature, the sheet is 
deformed or the pattern of the non-woven cloth is transferred onto the 
surface opposed to the laminated interface, leading to considerable 
reduction in commercial value. In addition, loss in laminating step is 
significant, since the employable temperature range for the lamination 
with the non-woven cloth is narrow. 
Furthermore, toxic gases are generated by the heating at the hot-lamination 
or folding step to cause environmental pollution problems. Setting aside 
the disadvantages described above, since the floppy disks are carried 
under various conditions, there is an increasing demand for a floppy disk 
jacket having a resistance to higher temperature. 
Moreover, a multi-ply material having a thin colored resin ply and a light 
impermeable ply could not be manufactured from a polyvinylchloride resin 
through an extrusion process due to the problem of thermal stability of 
the polyvinylchloride resin. Accordingly, a floppy disk jacket made of a 
polyvinylchloride resin having a colored layer could not be produced. 
OBJECTS AND SUMMARY OF THE INVENTION 
A primary object of this invention is to provide a floppy disk jacket 
improved in heat resistant property and having antistatic characteristics 
by laminating an antistatic styrene base resin sheet and a non-woven 
cloth. 
Another object of this invention is to provide a floppy disk jacket 
improved in commercial value, wherein the pattern of the non-woven cloth 
is not transferred at the step of hot lamination with the non-woven cloth. 
A further object of this invention is to provide a floppy disk jacket made 
of a material which can be processed in a temperature range wider than 
that for a hard polyvinylchloride resin to improve efficiency of 
lamination operation. 
A still further object of this invention is to provide a floppy disk jacket 
which can be manufactured without generating toxic gases at the hot 
lamination and hot folding steps. 
Yet a further object of this invention is to provide floppy disk jackets 
having exterior layers of different colors to allow easy distinction 
therebetween in assortment for different applications, users or types of 
machine. 
The above and other object of this invention will become apparent from the 
following description of the invention. 
A jacket for floppy disk, provided in accordance with the invention, 
comprises an exterior layer made of an antistatic styrene base resin 
composition, and an interior non-woven cloth layer laminated internally of 
the exterior layer. 
DESCRIPTION OF THE INVENTION 
The present invention will now be described more specifically in the 
following detailed description. 
The jacket for floppy disk, provided in accordance with the invention, 
comprises an exterior layer made of an antistatic styrene base resin 
composition, and an interior non-woven cloth layer laminated internally of 
the exterior layer. The exterior layer may be a single-ply layer of an 
antistatic styrene base resin; a double-ply layer including an antistatic 
styrene base resin ply and a non-conductive layer of another styrene base 
resin ply; or a triple-ply layer including a nonconductive styrene base 
intermediate ply sandwiched between two antistatic styrene base resin 
plies. The double-ply and triple-ply layers may be produced by a one-step 
co-extrusion process, or the respective plies may be produced separately 
and may be bonded. The co-extrusion process may be combined with the 
latter mentioned process. 
The styrene base resins usable in the invention include high impact 
strength styrene resins, mixtures of a styrene resin for general uses 
mixed with at least 20 wt% of a high impact strength styrene resin, 
acrylonitrile/styrene/butadiene copolymers, 
methacrylonitrile/styrene/butadiene copolymers, styrene/butadiene block 
copolymers, acrylonitrile/acrylic rubber/styrene copolymers, 
acrylonitrile/ethylenepropylene rubber/styrene copolymers, 
acrylonitrile/chlorosulfonated ethylene/styrene copolymers, 
acrylonitrile/.alpha.-methylstyrene/butadiene copolymers, and blends 
thereof. It is preferable to use acrylonitrile/styrene/butadiene 
copolymers or acrylonitrile/.alpha.-methylstyrene/butadiene copolymers, 
whereby particularly high heat resistant products may be prepared. 
An antistatic styrene base resin composition may be prepared by adding an 
antistatic agent to a styrene base resin, or an antistatic styrene resin 
layer may be prepared by coating the layer with an antistatic agent. For 
this purpose, nonionic and anionic surfactants may be used, particularly 
preferred surfactants being, for example N,N-bis(2-hydroxyethyl)tallow 
amine, polyoxyethylene lauryl amine and fatty acid esters of 
polyoxyethylene lauryl amine. The added amount of such an antistatic agent 
may range within 0.1 to 7 parts by weight, preferably 0.5 to 5 parts by 
weight, based on 100 parts by weight of the used styrene base resin. If 
the added amount of antistatic agent is less than 0.1 parts by weight, the 
antistatic effect of the resultant resin composition does not reach 
satisfactory level so that dusts tend to adhere on the product jacket. On 
the contrary, if the added amount exceeds 7 parts by weight, the resultant 
resin composition has an extreme lubricant effect to cause slip at the 
extrusion step or the excessive antistatic agent tends to bleed to the 
surface of the exterior layer. When an antistatic agent is coated on the 
exterior layer, the thickness of coating should range within 0.001 to 0.1 
g/m.sup.2, preferably within 0.005 to 0.05 g/m.sup.2, based on solids 
content. If the coating is thinner than the aforementioned range, 
satisfactory antistatic effect cannot be obtained and if the thickness of 
the coating is larger than 0.1 g/m.sup.2, the resultant exterior layer 
becomes disadvantageously sticky. 
The antistatic styrene base resin composition may otherwise be prepared by 
adding conductive carbon black, such as S.C.F. (Super Conductive Furnace), 
E.C.F. (Electric Conductive Furnace), Ketjen Black EC (Trade Name of the 
product available from Lion-AKZO Co., Ltd.) or acetylene black, to a 
styrene base resin; or may be prepared by adding a conductive metal, such 
as copper, aluminum, iron, nickel or stainless steel to a styrene base 
resin. It is desirous that the carbon black be added in an amount of from 
3 to 35 parts by weight, preferably from 5 to 20 parts by weight, to 100 
parts by weight of the styrene base resin. It is desirous that the 
conductive metal be added in an amount of from 2 to 25 parts by weight, 
preferably from 5 to 20 parts by weight, to 100 parts by weight of the 
styrene base resin. A mixture of two or more antistatic agents, conductive 
carbon blacks and/or conductive metals may be used. When an exterior layer 
of multi-ply structure is used, the nonconductive ply may be added with a 
nonconductive carbon black, such as furnace carbon or channel black, may 
be added to the matrix styrene base resin in an amount of 0.1 to 10 parts 
by weight based on 100 parts by weight of the resin for shielding. A 
stronger layer may be provided by a multi-ply structure, as compared to a 
single-ply layer. 
In the present invention, the interior non-woven cloth layer may be made of 
polyester, rayon or aromatic polyamide fiber or rock wool. The exterior 
layer and the interior layer may be bonded by hot-fusing at about 
160.degree. C. to 240.degree. C. 
The jaceket for floppy disk, according to the present invention, may 
include an intermediate layer extending between the exterior layer and the 
interior layer, and the exterior and intermediate layers may contain 
coloring agents, respectively. With this construction, the total light 
transmittance through the exterior and intermediate layers should be not 
more than 1%. If the light transmittance exceeds 1%, there arises a risk 
that the positioning of the floppy disk cannot be carried out. The merit 
of this construction resides in that jackets having different colors may 
be produced to facilitate easy assortment for assorting the floppy disks 
in the jackets with individual applications, users or types of machine in 
which the floppy disks are inserted. It is desirous that coloring agents, 
other than black, such as red, yellow, orange and blue coloring agents, 
may be used in the exterior layer. The color tone may be adjusted by using 
the same coloring agent in the exterior and intermediate layers, with the 
color densities of respective layers being varied. The amount of the 
coloring agent in the intermediate layer may be decreased as compared to 
that in the exterior layer to provide an intermediate layer having a 
higher mechanical strength. Otherwise, the coloring agent contained in the 
exterior layer may be different from that contained in the intermediate 
layer, for example, a blue coloring agent in the exterior layer and a 
black coloring agent in the intermediate layer, to reduce the light 
transmittance considerably. 
Any of dyestuffs, inorganic pigments and organic pigments may be used as 
the coloring agents, and the added amount of the coloring agents is not 
critical unless the properties of resin are not significantly affected and 
as far as the light transmittance is maintained at not more than 1%. 
The exterior layer made of an antistatic styrene base resin composition 
containing any one or more coloring agents may be a singly-ply structure, 
or may be a double-ply structure including an antistatic styrene base 
resin composition ply and a nonconductive styrene base resin composition 
ply containing a coloring agent. By the provision of a double-ply 
intermediate layer, with the ply closer to the exterior layer containing a 
white coloring agent or containing the same coloring agent as that 
contained in the exterior layer in an amount different from the amount 
thereof contained in the exterior layer, a product having a beautiful 
appearance which is not adversely affected by the coloring agent in the 
intermediate layer may be formed. The intermediate layer may be a 
structure having triple or more plies, if necessary. The layer containing 
double or more plies may be produced by any of co-extrusion, lamination or 
combination thereof. 
In a further embodiment of the invention, an adhesive layer made of an 
olefinic copolymer or a mixture of an olefinic copolymer with a styrene 
base resin may be provided between the exterior and interior layers. The 
resin composition used for the adhesive layer should be adhesive to both 
of the non-woven cloth and the exterior layer, preferable examples 
therefor being olefinic copolymers such as ethylenic copolymers, or 
modified olefinic copolymers. These resins may be used singly or in 
combination with the matrix styrene base resin used in the exterior layer. 
Examples of usable ethylenic copolymers are those selected from copolymers 
of ethylene with vinyl acetate, butene-1 or the like; and example of the 
usable modified olefinic copolymers are copolymers of olefin-2 modified 
with unsaturated carboxylic acids or anhydrides thereof; the most 
preferred being modified ethylene/vinyl acetate copolymers. When such an 
olefinic copolymer or modified olefinic copolymer is used by mixing with a 
matrix styrene base resin, it is preferable that the content of styrene 
base resin be not more than 90 wt%, and the adhesive strength at the 
lamination interface with the non-woven cloth is lowered to unsatisfactory 
level if the content thereof exceeds 90 wt%. 
The exterior and intermediate layers of the laminates of the invention may 
be added with inorganic fillers, ultraviolet ray absorber and/or other 
additives, if desired. The exterior layer may carry a printing. 
The multi-layer sheet used for the production of the jacket for floppy 
disks, according to the present invention, has a thickness normally 
ranging from 300 to 600 microns, with the preferable thickness of the 
exterior layer ranging from 150 to 280 microns, the total thickness of 
exterior layer plus intermediate layer being preferably within about 150 
to 350 microns, to produce a jacket having sufficient strength.

EXAMPLES OF THE INVENTION 
The present invention will be described in detail by referring to specific 
examples thereof. 
In the following Examples, the numerals in parentheses indicate, 
respectively, the commercially available materials which will be listed 
hereinafter. 
EXAMPLE 1 
Using a 40 m/m extruder, a single-layer sheet having a thickness of 240 
microns was extruded from a resin composition containing 100 parts by 
weight of an ABS resin (1), 5 parts by weight of an antistatic agent (5) 
and 3 parts by weight of a nonconductive carbon black (8). Then, the 
temperature at the step of laminating the same with a polyester non-woven 
cloth was varied, while measuring the temperature conditions through a 
unit sealer, to produce multi-layer sheets. The temperature conditions and 
the results are shown in Table 1. Each multi-layer sheet is cut into a 
170.times.300 m/m piece, with the sheet laminated with the non-woven cloth 
at 200.degree. C., followed by folding at 180.degree. C. to form a 5 inch 
square floppy disk jacket and then heat-sealing the marginal areas at 
220.degree. C. to produce a jacket. 
The thus produced jacket had good appearance without transfer of the 
non-woven cloth pattern and any deformation, and no bad odor was sensed at 
the heat treatments in the step of laminating with the non-woven cloth and 
also in the step of folding. The percent elongation by heating had an 
equivalent value at a temperature of higher than about 20.degree. C. as 
the corresponding value shown by Comparative Example 1, which revealed 
improved heat resistant property of the jacket of the invention. 
EXAMPLE 2 
Through a co-extrusion process, extruded was a double-ply sheet including 
25 micron thick first resin ply made of a composition composed of 100 
parts by weight of a high impact strength styrene resin (4), 3 parts by 
weight of an antistatic agent (6) and 3 parts by weight of a nonconductive 
carbon black, and a 200 micron thick second resin ply made of a 
composition composed of 100 parts by weight of a high impact strength 
styrene resin (4) and 3 parts by weight of a nonconductive carbon black. 
Similarly as in Example 1, the temperature at the step of laminating the 
same with a polyester non-woven cloth was varied, while measuring the 
temperature conditions through a unit sealer, to produce multi-layer 
sheets. The temperature conditions and the results are shown in Table 1. A 
jacket was produced by folding the material sheet at a temperature of 
170.degree. C. followed by heat-sealing at 160.degree. C. 
The thus produced jacket had good appearance without transfer of the 
non-woven cloth pattern and any deformation, and no bad odor was sensed at 
the heat treatments in the step of laminating with the non-woven cloth and 
also in the step of folding. The resistance to heat of the product was 
improved over that of Comparative Example 1. 
EXAMPLE 3 
Through a co-extrusion process, extruded was a triple-ply sheet including a 
180 micron thick core resin ply made of a composition composed of 100 
parts by weight of an ABS resin (2) and 2 parts by weight of a 
nonconductive carbon black (8), and two overcoat plies each having a 
thickness of 20 microns and composed of a composition composed of 100 
parts by weight of an ABS resin (3), 10 parts by weight of a nonconductive 
carbon black (8) and 3 parts by weight of an antistatic agent. 
Similarly as in Example 1, the temperature at the step of laminating the 
same with a polyester non-woven cloth was varied, while measuring the 
temperature conditions through a unit sealer, to produce multi-layer 
sheets. The temperature conditions and the results are shown in Table 1. 
A jacket was produced by folding the material sheet at a temperature of 
210.degree. C. followed by heat-sealing at 230.degree. C. 
The thus produced jacket had good appearance without transfer of the 
non-woven cloth pattern and any deformation, and no bad odor was sensed at 
the heat treatments in the step of laminating with the non-woven cloth and 
also in the step of folding. The percent elongation by heating had an 
equivalent value at a temperature of higher than about 30.degree. C. as 
the corresponding value shown by the Comparative Example 1, which showed 
improved thermal characteristics of the jacket of the invention. 
COMATIVE EXAMPLE 1 
The conditions at the lamination step was tested similarly as in Example 1, 
except that a hard polyvinylchloride resin was used in place of the 
exterior layer in Example 1. The results are shown in Table 1. The 
temperature range pertinent for lamination operation was very narrow, as 
shown. 
TABLE 1 
__________________________________________________________________________ 
Transfer 
Lamination Condition of Non- 
Percent Elongation of sheet (%) 
Pressure Strength 
Woven 
90.degree. C. .times. 30 Min. 
100.degree. C. .times. 30 
110.degree. C. .times. 30 
Min. 120.degree. C. 
.times. 30 Min. 
Temp. (Kg/ Time 
of Cloth 
Length- 
Trans- 
Length- 
Trans- 
Length- 
Trans- 
Length- 
Trans- 
(.degree.C). 
cm.sup.2 G) 
(Sec.) 
Laminate 
Pattern 
wise verse 
wise verse 
wise verse 
wise verse 
__________________________________________________________________________ 
Exam- 
ple 
1 170 0.5 0.5 O O 0 0 0 +0.1 
-1.0 +0.6 
-4.0 +0.7 
190 0.5 0.5 O O 
210 0.5 0.5 O O 
220 0.5 0.5 O O 
2 160 0.5 0.5 O O -0.5 
+0.2 
-2.1 
+0.6 
-4.3 +0.9 
- 
+1.0 
180 0.5 0.5 O O 
200 0.5 0.5 O O 
220 0.5 0.5 O O 
230 0.5 0.5 O O 
3 180 0.5 0.5 O O 0 0 0 0 0 +0.1 
-1.0 +0.4 
200 0.5 0.5 O O 
220 0.5 0.5 O O 
240 0.5 0.5 O O 
Comp. 
150 0.5 0.5 .DELTA. 
O -1.7 
+1.1 
-6.5 
+4.5 
-7.8 +4.3 
-10.1 
+5.2 
Ex. 160 0.5 0.5 O O 
1 170 0.5 0.5 O O 
180 0.5 0.5 O .DELTA. 
__________________________________________________________________________ 
The machine and starting materials used, the test methods and appraisals of 
the results thereof will be listed as follows. 
Unit Sealer: Produced by Ooyoshi Co. 
Determination of Properties: 
.circle.1 Strength of Laminate: 
The exterior resin layer was peeled from the non-woven cloth by hands. O 
indicates that the non-woven cloth was broken, and .DELTA. indicates that 
the laminate layer was peeled off at the interface. 
.circle.2 Transfer of Non-woven Cloth Pattern: 
Transfer of pattern was visually observed. 
O indicates that no transfer was observed, 
.DELTA. indicates that some transfer was observed, and 
X indicates that appreciable transfer was observed. 
The components used in Examples 1 to 3 and Comparative Example 1 were as 
follow: 
(1) ABS Resin: Available from Denki Kagaku Kogyo K.K. under the Trade Name 
of Denka ABS, GR-2000 
(2) ABS Resin: Available from Denki Kagaku Kogyo K.K. under the Trade Name 
of Denka ABS, HM 
(3) ABS Resin: Available from Denki Kagaku Kogyo K.K. under the Trade Name 
of Denka ABS, HH 
(4) High Impact Strength Styrene Resin: Available from Denki Kagaku Kogyo 
K.K. under the Trade Name of Denka Styrol HI-R-5 
(5) Antistatic Agent: Available from Sanyo Kasei Kogyo K.K. under the Trade 
Name of Chemistat 3033 
(6) Antistatic Agent: Available from Kao Soap co., Ltd. under the Trade 
Name of Electrostripper PC 
(7) Antistatic Agent: Available from Kao Soap Co., Ltd. under the Trade 
Name of Electrostripper EA 
(8) Nonconductive Carbon Black: Available from Mitsubishi Carbon Co., Ltd. 
under the Trade Indication of MA-100 
Example 4 
A co-extrusion equipment including two 40 mm extruders and one 65 mm 
extruder was used to extrude the combination of the top skin ply, the core 
or substrate ply and the bottom skin ply to prepare a triple-ply sheet 
having a total thickness of 230 microns and a width of 500 mm, from the 
composition shown in Table 2. The composition used for forming the top 
skin ply contained 2 parts by weight of an alkylamine base antistatic 
agent, available from Kao Soap Co., Ltd. under the Trade Name of 
"Electrostripper PC" to 100 parts by weight of the ABS resin. The light 
transmittance of the thus produced sheet was measured. The result is shown 
in Table 2. The sheet was then cut into a sheet having a length of 290 mm 
and a width of 170 mm, followed by hot fusing the surface of the bottom 
skin layer with a non-woven cloth, and a jacket for a 51/2 inch floppy 
disk was manufactured therefrom. The observed appearance of the jacket is 
shown also in Table 2. 
Both of the light transmittance and appearance were satisfactory. 
EXAMPLES 5 TO 8 
Using the same co-extrusion equipment as used in Example 4, the resin 
compositions shown in Table 2 were extruded to form respective plies of 
respective runs. After extrusion, the surface of the top skin layer of 
each run was coated with an alkylamine base antistatic agent available 
from Kao Soap Co., Ltd. under the Trade Name of "Electrostripper QN" to 
form a 0.02 g/m.sup.2 thick coating. After bonding the bottom skin ply 
with a non-woven cloth by hot fusing, a jacket for a 51/4 inch floppy disk 
was manufactured therefrom and the appearance of the jacket was inspected. 
Both of the light transmittance and appearance were satisfactory. 
TABLE 2 
______________________________________ 
(parts by weight) 
Example 
4 5 6 7 8 
______________________________________ 
Composition 
Top ABS 84 80 90 -- 92 
Skin Resin (1) 
Ply ABS 8 12 10 -- -- 
Resin (2) 
PS Resin -- -- -- 90 -- 
Coloring 8 -- -- -- 8 
Agent (1) 
Coloring -- 8 -- -- -- 
Agent (2) 
Coloring -- -- 10 -- -- 
Agent (3) 
Coloring -- -- -- 10 -- 
Agent (4) 
Thickness (.mu.) 
30 20 30 30 160 
Core ABS 99 98 99 100 -- 
Ply Resin (1) 
Coloring 1 -- -- -- -- 
Agent (1) 
Coloring -- -- 1 -- -- 
Agent (3) 
Coloring -- 2 -- -- -- 
Agent (5) 
Thickness (.mu.) 
170 180 180 130 -- 
Bottom 
ABS 85 83 85 -- 91.5 
Skin Resin (1) 
Ply ABS 4.5 7 12.5 
-- -- 
Resin (2) 
PS Resin -- -- -- 79.99 
-- 
Coloring 10 9.5 -- -- 8 
Agent (5) 
Coloring 0.5 0.5 2.5 0.01 
0.5 
Agent (6) 
Calcium -- -- -- 20 -- 
Carbonate 
Thickness (.mu.) 
30 20 20 70 90 
Properties 
Appearance Fair Fair Fair Fair Fair 
Light Transmittance 
1&gt; 1&gt; 1&gt; 1&gt; 1&gt; 
(%) 
______________________________________ 
Starting materials for the multi-ply sheets shown in Table 2 and the used 
non-woven cloth are as follows. 
(1) Non-woven Cloth: Available from Misubishi Rayon Company Limited under 
the Trade Indication of JB-3F-4 
(2) ABS Resin (1): Available from Denki Kagaku Kogyo K.K. under the Trade 
Name of Denka ABS HM 
(3) ABS Resin (2): Available from Denki Kagaku Kogyo K.K. under the Trade 
Name of Denka ABS QF 
(4) PS Resin: Available from Denki Kagaku Kogyo K.K. the Trade Name of 
Denka Styrol HI-E-6 
(5) Coloring Agent (1): Available from Tokyo Ink K.K. under the Trade Name 
of DKAB-384Y-7 (Yellow) 
(6) Coloring Agent (2): Available from Tokyo Ink K.K. under the Trade Name 
of DKAB-584Y-9 (Blue) 
(7) Coloring Agent (3): Availble from Tokyo Ink K.K. under the Trade Name 
of KAM-684Y-8 (Green) 
(8) Coloring Agent (4): Available from Tokyo Ink K.K. under the Trade Name 
of PS-483Y-29R (Red) 
(9) Coloring Agent (5): Available from Tokyo Ink K.K. under the Trade Name 
of PS-183Y-13W (White) 
(10) Coloring Agent (6): Available from Tokai Carbon K.K. under the Trade 
Name of Seast 3 (Black) 
(11) Calcium Carbonate: Available from Shiraishi Calcium K.K. under the 
Trade Name of Whiton SB Red 
Determination of Properties 
(1) Appearance: The warp of the manufactured jacket and the smoothness of 
the surface thereof was visually inspected, and those without warp and 
having a smooth surface were appreciated as fair. 
(2) Percent Light Transmittance through the Sheet: Determined generally in 
accordance with the JISC-6291 Method. 
EXAMPLE 9 
Through a co-extrusion process, extruded was a double-ply sheet having a 
200 micron thick top skin ply made of a composition composed of 100 parts 
by weight of an ABS resin, 5 parts by weight of an antistatic agent (1) 
and 3 parts by weight of a nonconductive carbon black, and a 30 micron 
thick adhesive ply made of a mixture containing 70 wt% of a modified 
olefinic copolymer and 30 wt% of an ABS resin. Then, the temperature 
conditions for laminating the double-ply sheet with a non-woven cloth of 
polyester fibers were determined, using a unit sealer. The results are 
shown in Table 3. The multi-ply sheet was cut into a 170.times.300 m/m 
piece, laminated with a non-woven cloth, folded at 180.degree. C. to form 
a 5 inch floppy disk jacket size superimposed foldings, and the marginal 
portions of the superimposed foldings were heat-sealed at 190.degree. C. 
to produce a jacket. 
The thus produced jacket had good appearance without transfer of the 
non-woven cloth pattern and any deformation, and no bad odor was sensed at 
the heat treatment in the step of laminating with the non-woven cloth and 
also in the step of folding under heat. 
EXAMPLE 10 
Through a co-extrusion process, extruded was a triple-ply sheet having a 
225 micron thick top skin layer including a 25 micron thick film made of a 
composition composed of 100 parts by weight of a high impact strength 
styrene resin, 3 parts by weight of an antistatic agent (2) and 3 parts by 
weight of a nonconductive carbon black and a 200 micron thick sheet made 
of a composition composed of 100 parts by weight of a high impact strength 
styrene resin and 3 parts by weight of a nonconductive carbon black, and a 
25 micron thick adhesive layer made of a mixture containing 50 wt% of a 
modified polyolefin and 50 wt% of the high impact strength styrene resin. 
A laminate was prepared from the triple-ply sheet and a non-woven cloth 
and subjected to measurement using a similar unit sealer as used in 
Example 9. The results are shown in Table 3. A jacket was produced by 
folding at a temperature of 170.degree. C. followed by heat-seal at 
160.degree. C. 
The thus produced jacket had good appearance without transfer of the 
non-woven cloth pattern and any deformation, and no bad odor was sensed at 
the heat treatment in the step of laminating with the non-woven cloth and 
also in the step of folding under heat. 
COMATIVE EXAMPLE 2 
The temperature conditions for laminating with a non-woven cloth were 
determined, using a hard polyvinylchloride resin in place of the top skin 
layer of Example 9. The results are shown in Table 3. The tolerable 
temperature range for the lamination was extremely narrow. 
TABLE 3 
______________________________________ 
Condition for Lamination 
Strength Transfer of 
Temp. Pressure Time of Non-woven 
.degree.C. Kg/cm.sup.2 
(Sec.) Laminate 
Cloth Pattern 
______________________________________ 
Example 
9 140 0.5 0.5 O O 
150 0.5 0.5 O O 
170 0.5 0.5 O O 
190 0.5 0.5 O O 
210 0.5 0.5 O O 
220 0.5 0.5 O O 
10 150 0.5 0.5 O O 
160 0.5 0.5 O O 
180 0.5 0.5 O O 
200 0.5 0.5 O O 
220 0.5 0.5 O O 
230 0.5 0.5 O O 
Com. 150 0.5 0.5 .DELTA. 
O 
Ex. 160 0.5 0.5 O O 
2 170 0.5 0.5 O O 
180 0.5 0.5 O .DELTA. 
______________________________________ 
The starting materials used, the test methods and appraisals the results 
thereof will be listed as follows. 
Determination of Properties: 
.circle.1 Strength of Laminate: 
The exterior resin layer was peeled from the non-woven cloth by hands. O 
indicates that the non-woven cloth was broken, and .DELTA. indicates that 
the laminate layer was peeled off at the interface. 
.circle.2 Transfer of Non-woven Cloth Pattern: 
Transfer of pattern was visually observed. 
O indicates that no transfer was observed, 
.DELTA. indicates that some transfer was observed, and 
X indicates that appreciable transfer was observed. 
The components used in Examples 9 and 10 and Comparative Example 2 were as 
follow: 
(1) ABS Resin: Available from Denki Kagaku Kogyo K.K. under the Trade Name 
of Denka ABS, GR-2000 
(2) High Impact STrength Styrene Resin: Available from Denki Kagaku Kogyo 
K.K. under the Trade Name of Denka Styrol HI-R-5 
(3) Antistatic Agent (1): Available from Sanyo Kasei Kogyo K.K. under the 
Trade Name of Chemistat 3033 
(4) Antistatic Agent (2): Available from Kao Soap Co., Ltd. under the Trade 
Name of Electrostripper PC 
(5) Carbon Black: Available from Mitsubishi Carbon Co., Ltd. under the 
Trade Indication of MA-100 
(6) Modified Olefinic Copolymer: Available from Mitsubishi Petrochemical 
Company Limited under the Trade Name of Modic E-300K 
Although the present invention has been described with reference to the 
specific examples, it should be understood that various modifications and 
variations can be easily made by those skilled in the art without 
departing from the spirit of the invention. Accordingly, the foregoing 
disclosure should be interpreted as illustrative only and not to be 
interpreted in a limiting sense. The present invention is limited only by 
the scope of the following claims.