Process for producing molded article using a releasing agent

A process for producing a molded article is provided including PA1 a) The surface of a mold is cooled with a releasing agent for powder molding which has, as an essential component, a copolymer AB derived from at least one monomer A represented by the following general formula (I) ##STR1## wherein X is a hydrogen atom or a methyl group, k is an integer of 0-5, l is an integer of 1-3, m is an integer of 1-3, n is an integer of 0-550 and Y is a methyl group or a fluorine atom-containing substituent having 1-20 carbon atoms, PA1 and at least one vinyl-polymerizable monomer B containing at least one alkyl acrylate or alkylmethacrylate wherein the alkyl group has 1 to 8 carbon atoms. PA1 b) The coated mold is heated. PA1 c) A powder of a non-rigid vinyl chloride resin containing a plasticizer is allowed to adhere to the heated mold to melt the powder. PA1 d) The mold, releasing agent and powder are cooled to form a molded article. PA1 e) The molded article is peeled from the mold. Monomer A and monomer B are combined in proportions within the copolymer AB such that the film of releasing agent has good compatibility with the vinyl chloride resin and sufficient releasability from the mold such that the film migrates to the surface of the molded article at the time of peeling.

BACKGROUND OF THE INVENTION 
1. Field of the invention 
The present invention relates to a releasing agent for powder molding and a 
process for producing a molded article using said releasing agent. More 
particularly, the present invention relates to a releasing agent for 
powder molding, which comprises a polymer having (a) a silyl group having 
methyl group or fluorine atom-containing substituent of 1-20 carbon atoms 
as a side chain or (b) (poly)dimethylsiloxanyl group (in this 
specification, "(poly)dimethylsiloxanyl" means "dimethylsiloxanyl" or 
"(poly)dimethylsiloxanyl") having a methyl group or a fluorine 
atom-containing substituent of 1-20 carbon atoms at the terminal, as well 
as to a process for producing a molded article using said releasing agent. 
2. Prior Art 
There were recently developed various molding processes and coating 
processes each using a powdery synthetic resin. Typical of these processes 
include a rotational molding process, a slush molding process, a 
fluidization dip coating process and an electrostatic coating process. All 
of these molding and coating processes have an advantage in that they can 
produce an intended pattern very well. Therefore, the molds used in these 
molding and coating processes have a very complex shape with fine 
projections and depressions. However, the molded articles obtained with 
such molds mesh tightly like a dropped anchor with the fine projections 
and depressions of the molds, making it difficult to peel them from the 
molds with complex shape. Hence, there has conventionally been adopted a 
method of imparting lubricity to the interface between mold and molded 
article, and there has been widely used, as a releasing agent, an internal 
lubricant which is added to a molding material, or an external lubricant 
which is coated on the surface of the mold. 
These conventional releasing agents for powder molding are intended to 
allow the interface between mold and molded article to have lubricity. 
However, the internal lubricant which is added to a molding material, is 
superior in handling but very easily bleeds out onto the surface of molded 
article. Reducing the bleeding by improving the compatibility of the 
internal lubricant with a resin (e.g. vinyl chloride resin) which is a 
main component of molding material, invites retention of the internal 
lubricant within the molded article and resultantly no migration of the 
lubricant to the interface between mold and molded article; therefore, the 
lubricant does not achieve the intended effect. On the other hand, the 
external lubricant which is coated on a mold for reduction in peeling 
strength, has poor compatibility with both the mold and a molded article 
and accordingly induces repellence between the mold and the molded 
article; thus, it has an excellent releasing effect. However, when the 
molded article is peeled from the mold, the external lubricant is repelled 
by the surfaces of the mold and the molded article because of its poor 
compatibility with them, and remains on the surfaces in liquid or solid 
spots. This requires, after molding, cleaning of the molded article and 
the mold to remove the external lubricant remaining thereon. Cleaning of 
the mold in particular, after each molding operation, reduces work 
efficiency; in order to avoid low work efficiency, mold cleaning is 
actually effected once per several molding operations. Such continuous use 
of mold without cleaning, however, causes the oxidation and/or 
decomposition of external releasing agent and results in gradual 
cloudiness in spots of the mold's mirror surface. Further progress of this 
phenomenon causes coverage of the fine projections and depressions of the 
mold by oxidized and/or decomposed external lubricant. Since in powder 
molding, the pattern of a mold is reproduced precisely, the coverage of 
the projections and depressions or the formation of cloudy portions 
implies that these covered or cloudy portions are also reproduced as such 
in the molded article. 
The objects of the present invention are to provide a releasing agent for 
powder molding, which is free from the above-mentioned drawbacks of the 
conventionally known releasing agent for powder molding, and which uses a 
volatile solvent type polymer capable of forming a film of larger contact 
angle than the conventional releasing agents and accordingly of good 
releasability, as well as to provide a process for producing a molded 
article using said releasing agent. 
SUMMARY OF THE INVENTION 
The present invention relates to a releasing agent for powder molding, 
which comprises, as an essential component, a copolymer AB obtained by 
copolymerizing at least one monomer A represented by the following general 
formula (I) 
##STR2## 
(X is a hydrogen atom or a methyl group; k is an integer of about 0-5; l 
is an integer of about 1-3; m is a integer of about 1-3; n is an integer 
of about 0-550; Y is a methyl group or a fluorine atom-containing 
substituent having about 1-20 carbon atoms) and at least one 
vinyl-copolymerizable monomer B copolymerizable with at least one monomer 
A, as well as to a process for producing a molded article using said 
releasing agent.

DETAILED DESCRIPTION OF THE INVENTION 
In the releasing agent for powder molding according to the present 
invention, there is used, as the essential component, a copolymer AB 
obtained by copolymerizing at least one monomer A represented by the 
general formula (I) and at least one vinyl-copolymerizable monomer B 
copolymerizable therewith. The copolymer AB contains the unit derived from 
the monomer A in an amount of preferably about 2-50% by weight, more 
preferably about 5-35% by weight based on the weight of the copolymer AB. 
With respect to the monomer B, it is preferable that this monomer B 
contains at least one alkyl acrylate or alkyl methacrylate whose alkyl 
group has about 1-8 carbon atoms, and the content of the unit derived from 
said alkyl acrylate or alkyl methacrylate in the copolymer AB ranges about 
25-98% by weight, preferably about 40-95% by weight based on the weight of 
copolymer AB. It is possible that two or more copolymers AB are optionally 
used in combination. 
The monomer A as a material for the copolymer AB is represented by the 
general formula (I) and is an unsaturated monoester having, within the 
molecule, (poly)dimethylsiloxanyl group (n is 1 or more) or a silyl group 
(n is 0). In the formula (I), n is defined to be about 0-550 because when 
n is greater than 550, the monomer has reduced polymerizability and/or 
copolymerizability, making it difficult to obtain a copolymer AB capable 
of forming a uniform film. 
Also in the formula (I), it is desirable that k is about 0-5 and l is about 
1-3, because of the availability of the material, effective releasing 
ability and simple synthesis. Further, the number of the 
(poly)dimethylsiloxanyl group (in case n is 1 or more) or the group 
represented by Y (in case n is 0) can be 1-3. 
Specific compound names of the monomer A represented by the general formula 
(I) are mentioned below as examples. When Y is a methyl group-containing 
substituent, there can be mentioned 
3-(trimethylsilyl)propyl(meth)acrylate, 3-[dimethyl(trimethylsiloxanyl)sil 
yl]propyl(meth)acrylate, polydimethylsiloxanylmethyl (meth)acrylate, 
2-(polydimethylsiloxanyl)ethyl (meth)acrylate, 
3-(polydimethylsiloxanyl)propyl (meth)acrylate, 
.alpha.-(meth)acryloyl-.omega.-(3-polydimethylsiloxanylpropyl) 
monoethylene glycol, 
.alpha.-(meth)acryloyl-.omega.-(3-polydimethylsiloxanylpropyl) triethylene 
glycol, 3-[bis(polydimethylsiloxy)methylsilyl]propyl (meth)acrylate and 
3-[tris(polydimethylsiloxy)silyl]propyl (meth)acrylate (in all of these 
compounds, n is not more than 550). When Y is a fluorine atom-containing 
substituent of 1-20 carbon atoms, there can be mentioned 
3-[bis(2-pentafluoroethylethyl)methylsilyl]propyl(meth)acrylate, 
3-[tris{(2-pentafluoroethylethyl)dimethylsiloxy}silyl]propyl(meth)acrylate 
, 3-[.omega.-(2-nonafluorobutylethyl)polydimethylsiloxanyl]propyl 
(meth)acrylate, 
3-[.omega.-(2-heptadecafluorooctylethyl)polydimethyl-siloxanyl]propyl 
(meth)acrylate, 
3-[bis[.omega.-(2-pentatriaconta-fluoroheptadecylethyl)polydimethylsiloxy] 
methylsilyl]propyl (meth)acrylate, 
3-[tris[.omega.-(2-pentatriacontafluoro-heptadecylethyl)polydimethylsiloxy 
]silyl]propyl (meth)acrylate and 
3-(.omega.-heptafluorophenylpolydimethylsiloxanyl]propyl (meth)acrylate 
(in all of these compounds, n is not more than 550). One or more of these 
specific compounds can be used as the monomer A. Incidentally, the 
(meth)acrylate means that it can be any of acrylate and methacrylate, and 
the (meth)acryloyl means that it can be any of acryloyl and methacryloyl 
(The same applies hereinafter.). 
The above compounds as the monomer A are easily available commercially. 
They are synthesized by, for example, reacting (meth)acrylic acid with 
allyl alcohol or an alkylene glycol monoallyl ether to obtain an ester and 
then subjecting the ester to an addition reaction with a trimethylsilyl 
compound, a silyl compound having 1-3 fluorine atom-containing 
substituents of 1-20 carbon atoms, a (poly)dimethylsiloxane compound or a 
polydimethylsiloxane compound having, at the terminal, a fluorine 
atom-containing substituent of 1-20 carbon atoms. 
As the vinyl monomer B which is another material for the copolymer AB, 
there can be used at least one member selected from, for example, 
methacrylic acid; methacrylic acid esters such as methyl methacrylate, 
ethyl methacrylate, 2-ethylhexyl methacrylate, 2-hydoroxyethyl 
methacrylate, and the like; acrylic acid; acrylic acid esters such as 
ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, 2-hydoroxyethyl 
acrylate, and the like; maleic acid; maleic acid esters such as dimethyl 
maleate, diethyl maleate and the like; fumaric acid; fumaric acid esters 
such as dimethyl fumarate, diethyl fumarate and the like; styrene; 
vinyltoluene; .alpha.-methylstyrene; vinyl chloride; vinyl acetate; 
butadiene; acrylamide; and acrylonitrile. 
The vinyl monomer B acts as a modifier for endowing the releasing agent 
film with various properties required so as to meet application purposes. 
The vinyl monomer B is also a component convenient for obtaining a polymer 
of higher molecular weight than the homopolymer of the monomer A. The 
amount of the monomer B used is determined in an appropriate range by 
considering the above property requirements for a releasing agent film and 
the releasability based on the monomer A. The proportion of the unit 
derived from the monomer B in the copolymer AB can be generally about 
50-98% by weight, preferably about 65-95% by weight. In other words, when 
the proportion of the monomer A unit in the copolymer AB is about 2-50% by 
weight, preferably about 5-35% by weight, the releasability based on the 
monomer A can be exhibited fully. When the proportion of the monomer A 
unit is less than 2% by weight, insufficient releasability may possibly be 
expressed, and when the proportion is more than 50% by weight, the 
resulting releasing agent has poor compatibility with a resin (molding 
material), which may cause bleeding of releasing agent from molded article 
or retention of the releasing agent on the mold. Accordingly, it is 
preferable that the amounts of the monomer A and the monomer B are 
determined appropriately so that the units derived from the monomer A and 
the monomer B are in the above ranges. Further, in order to improve the 
compatibility of the releasing agent with the resin and transfer all the 
filmy releasing agent on the mold to the molded article during molding 
operation (no releasing agent remains on the mold), and moreover in order 
to allow the releasing agent transferred to the molded article to cause 
neither bleeding nor blooming on the molded article, it is desirable that 
the monomer B contain at least one alkyl (meth)acrylate whose alkyl group 
has 1-8 carbon atoms and that the content of the unit derived from the 
alkyl (meth)acrylate in the copolymer AB ranges about 25-98% by weight, 
preferably about 40-95% by weight based on the weight of copolymer AB. 
When the content is less than 25% by weight, it is difficult to obtain a 
releasing agent having good compatibility with the resin, and when the 
content is more than 98% by weight, the molded article may not have 
sufficient releasability. As example of the alkyl (meth)acrylate whose 
alkyl group has 1-8 carbon atoms, there can be mentioned, those acrylic 
acid esters and methacrylic acid esters specifically mentioned as examples 
of monomer B. 
The copolymer AB can be obtained by polymerizing the monomer A and monomer 
B in the presence of a vinyl polymerization initiator, by solution 
polymerization, bulk polymerization, emulsion polymerization, suspension 
polymerization or the like according to a conventional method. As the 
vinyl polymerization initiator. There can be mentioned, for example, azo 
compounds such as azobisisobutyronitrile, triphenylmethylazobenzen and the 
like, and peroxides such as benzoyl peroxide, di-t-butyl peroxide and the 
like. 
The thus obtained copolymer AB preferably has a number-average molecular 
weight of about 1,000-300,000. When the molecular weight is too low, it is 
difficult to form a film on the mold which can withstand a molding 
operation, and when the molecular weight is too high, such a copolymer 
must be used in a small amount to prepare a coating varnish of proper 
viscosity, and therefore such a varnish needs to be coated several times 
to obtain a dried film of desired thickness on the mold. 
As mentioned above, the releasing agent for powder molding according to the 
present invention is used ordinarily in the form of a varnish obtained by 
dissolving the copolymer AB in an organic solvent. In view of this point, 
the polymerization method for obtaining the copolymer AB is desirably 
solution polymerization or bulk polymerization, in particular. In the 
solution polymerization, the reaction mixture after polymerization can be 
used as it is or by diluting with a solvent. In the bulk polymerization, 
the reaction product is mixed with a solvent and then used. 
As the organic solvent, there can be mentioned, for example, aromatic 
hydrocarbon solvents such as xylene, toluene and the like; ester solvents 
such as ethyl acetate, butyl acetate and the like; ether solvents such as 
a dioxane, diethyl ether and the like; alcohol solvents such as butyl 
alcohol and the like; and ketone solvents such as methylethyl ketone, 
methyl isobutyl ketone and the like. These solvents can be used alone or 
in admixture. 
The amount of the organic solvent used is desirably such that the 
concentration of copolymer AB in the varnish becomes ordinarily about 
0.5-40% by weight, particularly about 1-10% by weight. The desirable 
viscosity of the varnish is generally about 10 poises or less at 
25.degree. C. because film formation is easy at this viscosity level. 
The present releasing agent for powder molding constituted as above may 
contain, optionally, a coloring agent such as pigment (e.g. titanium 
dioxide), dye or the like. The releasing agent may further contain an 
anti-sagging agent, a dispersant for pigment, an anti-settling agent, a 
levelling agent, an antifoaming agent, etc. all of conventional use. 
Formation of a releasing agent film on the surface of a mold using the 
present releasing agent for powder molding, can be effected simply by, for 
example, coating the releasing agent of varnish form on the mold surface 
by an appropriate means and then drying the coated mold at normal 
temperature or with heating to evaporate and remove the solvent contained 
in the coated varnish. Thereby, a releasing agent film of small surface 
tension and good lubricity can be formed uniformly. 
Thus, the releasing agent for powder molding according to the present 
invention is coated on the surface of a mold; the coated mold is heated; a 
material for powder molding is allowed to adhere to the heated mold and 
thereby melted; the total system is cooled; the resulting molded article 
is peeled from the mold; and thus a molded article can be produced. 
The material for powder molding, i.e. the resin for obtaining a molded 
article therefrom is preferably a non-rigid vinyl chloride resin 
containing a plasticizer. As the vinyl chloride resin, there can be used a 
vinyl chloride polymer or a copolymer of vinyl chloride and a monomer 
copolymerizable therewith, and the polymer or copolymer is preferably 
produced generally by suspension polymerization or bulk polymerization so 
that it has large particle diameters and is porous in order to have good 
absorbability for the plasticizer. As the monomer copolymerizable with 
vinyl chloride, there is preferred at least one compound selected from, 
for example, ethylene, propylene, butene, 1-pentene, vinyl acetate, 
dialkyl maleates (the alkyl groups have 1-12 carbon atoms),dialkyl 
fumarates (the alkyl groups have 1-12 carbon atoms), vinyl esters of 
carboxylic acids (e.g. caproic acid, caprylic acid, benzoic acid), 
vinylidene chloride and alkyl vinyl ethers (the alkyl group has 1-16 
carbon atoms). As the copolymer, preferable is one obtained by 
copolymerizing 100 parts by weight of vinyl chloride and 40 parts by 
weight or less, preferably 30 parts by weight or less, of at least one 
comonomer as mentioned above in the presence of a polymerization 
initiator. 
The plasticizer to be absorbed by the vinyl chloride polymer may be any 
plasticizer as long as it can be used in vinyl chloride resins. For 
example, there can be used dialkyl phthalate, dialkyl adipate, trialkyl 
trimellitate, dialkyl sebacate, dialkyl azelate, alkyl benzyl phthalate, 
trialkyl phosphate and alkyl allyl phosphate (these alkyl groups have 4-13 
carbon atoms), as well as polyester plasticizers. Specifically, there can 
be mentioned di-n-butyl phthalate, di-n-octyl phthalate, di-2-ethylhexyl 
phthalate (DOP), diisooctyl phthalate, octyl decyl phthalate, diisodecyl 
phthalate, butyl benzyl phthalate, di-2-ethylhexyl isophthalate, 
di-2-ethylhexyl adipate (DOA), di-n-decyl adipate, diisodecyl adipate, 
tri-2-ethylhexyl trimellitate, tri-n-octyl trimellitate, tridecyl 
trimellitate, 2-ethylhexyl azelate, dibutyl sebacate, di-2-ethylhexyl 
sebacate, tributyl phosphate, 2-ethylhexyl phosphate, 2-ethylhexyl 
diphenyl phosphate, tricresyl phosphate, etc. These compounds can be used 
alone or in admixture of two or more. The amount of the plasticizer used 
is about 20-150 parts by weight, preferably about 40-130 parts by weight 
per 100 parts by weight of the vinyl chloride polymer. 
The vinyl chloride polymer containing the absorbed plasticizer may further 
contain other additives such as stabilizer, coloring agent, lubricant, 
filler, secondary plasticizer and the like to the extent that these 
additives give no adverse effects on powder molding. 
The resin composition for powder molding can be obtained using an ordinary 
means, and no special means is required. It can be obtained by using, for 
example, a mixer with a jacket for cooling and heating, or a Henschel 
Mixer.RTM.. Specifically, there are placed in such a mixer, a vinyl 
chloride polymer, a required amount of plasticizer, a heat stabilizer, a 
lubricant, a pigment, etc.; they are stirred while steam is passed through 
the mixer jacket to heat them to about 110-130.degree. C.; then, stirring 
is continued for 10-40 minutes, preferably 10-30 minutes with the 
temperature kept not to exceed 130.degree. C., to allow the resin (the 
vinyl chloride polymer) to sufficiently absorb the plasticizer. Heating at 
temperatures above 130.degree. C. is undesirable because the vinyl 
chloride polymer causes gelation, although the gelation is somewhat 
influenced by the mixing ability, number of revolutions, blade shape, etc. 
of the mixer. Meanwhile, heating at low temperature is also undesirable 
because the absorption rate for plasticizer is low, the mixing efficiency 
is low, and the portion of the plasticizer not absorbed by the vinyl 
chloride polymer remains on the surfaces of polymer articles and the 
resulting resin composition for powder molding has reduced fluidity as a 
powder. Hence, the temperature during stirring is preferably kept at about 
110.degree.-130.degree. C., preferably about 115.degree.-125.degree. C. 
Next, the contents in the mixer are cooled to around normal temperature by 
passing cooling water instead of steam through the jacket. Lastly, a 
necessary amount (ordinarily about 5-20 parts by weight per 100 parts by 
weight of the resin) of the polyvinyl chloride obtained by emulsion 
polymerization is added to the mixer contents, and stirring is effected 
for an additional period of about 2-10 minutes to allow the surfaces of 
the particles of mixer contents to be covered with the vinyl chloride 
emulsion polymer. 
The copolymer AB used in the present invention has, as a side chain, a 
silyl group or (poly)dimethylsiloxanyl group having a polymerization 
degree (n) of about 1-550, derived from the monomer A. The side chain has, 
as Y, a methyl group or fluorine atom-containing substituent of about 1-20 
carbon atoms at the terminal. Accordingly, the film formed by the 
copolymer has good lubricity and can effectively prevent the powder 
molding material which has been melted and has become a gel on the heated 
mold, from sticking to the mold. This effect of preventing sticking is at 
least equal to those of the above-mentioned conventional releasing agents 
for powder molding. 
Further, since the releasing agent for powder molding according to the 
present invention has very good compatibility with the resin (the molding 
material), the releasing agent coated on the mold migrates completely onto 
the surface of the molded article at the time of peeling the molded 
article from the mold. As a result, no releasing agent remains can the 
mold surface and there is no fear of the problems experienced with the 
conventional external lubricants, such as decomposition of releasing 
agent, cloudiness of mold's mirror surface, cleaning of mold and the like. 
Further, the molded article which has been peeled from the mold, has 
thereon a film of the releasing agent, and this film and the molded 
article are strongly bonded to each other. Therefore, the molded article 
is endowed with such properties as prevention of bleeding, prevention of 
dust or stain sticking, slipperiness (non-tackiness) and the like. 
Further, since the copolymer AB is soluble in organic solvents, it can 
easily made into a uniform film by dissolving it in an organic solvent, 
coating the resulting solution onto the mold surface and then drying the 
coated mold. Moreover, since the copolymer AB is not a reactive and curing 
type but an essentially non-reactive type, the film formed therewith is 
not affected by the moisture in the atmosphere or the environmental 
temperature. In addition, the releasing agent, when made into a solution, 
has excellent storage stability. 
The releasing agent for powder molding according to the present invention 
is not a type which causes crosslinking during film formation, and 
accordingly is hardly cured or dried by humidity, temperature, etc. As a 
result, with the present releasing agent there is seen neither peeling 
caused by insufficient curing of film, nor reduction in releasability due 
to bulging, etc. Further, since film formation is caused only by solvent 
evaporation on coated surface, drying occurs rapidly and the mold, etc. 
coated with the present releasing agent can be used in a short time. 
As shown in Examples and Comparative Examples, the film formed with the 
present releasing agent has a very large contact angle and endows the 
surface of the mold with good slipperiness. Consequently, peeling of a 
molded article from a mold having formed thereon a film of the present 
releasing agent can be done very smoothly. This eliminates pulling of the 
molded article by strong forces and consequent deformation of the molded 
article. Further, since the releasing agent film is inactive and 
heat-resistant, there can be prevented adhesion of powder molding material 
to the mold, caused by fusion of the material. Furthermore, since the 
releasing agent film has good compatibility with resin (powder molding 
material), the film migrates completely from the mold, and no releasing 
agent remains on the mold. This is shown in Table 3; that is, in a 
continuous molding by an ordinary mold, cloudiness of the mold surface 
begins at about the 30th molding and no mirror surface is present at the 
50th molding. Further, since the present releasing agent which has 
migrated to the surface of molded article has a strong bond with the 
molded article, the releasing agent is not peeled from the molded article 
surface and retains its properties. Therefore, the molded article surface 
is endowed with very good slipperiness. The presence of the strong bond 
assures freedom from plasticizer migration, dust pickup and staining, and 
is superior in scratch resistance. Also, there occurs no sticking of 
molded articles to each other. 
When the present releasing agent is stored in a solution form, it has good 
stability to moisture and heat; which serves for reduced cost. When there 
remains a part of the present releasing agent solution after its use, it 
can be stored for reuse simply by stoppering the container. 
EXAMPLES 
The present invention is described more specifically by way of Examples and 
Comparative Examples. The polymer solutions used in Examples 1-11 and 
Comparative Examples 2-4 were prepared in Production Examples 1-11. In the 
production examples, parts refer to parts by weight, and each molecular 
weight refers to a number-average molecular weight determined by GPC. 
PRODUCTION EXAMPLE 1 
500 g of toluene was charged into a flask provided with a stirrer and 
heated to 80.degree. C. To this toluene being stirred was added dropwise 
in 2 hours a mixed solution consisting of 300 g of methylmethacrylate 
(hereinafter refereed to as MMA), 129 g of 3-(polydimethylsiloxanyl)propyl 
methacrylate (a monomer A of the general formula (I) wherein X and Y are 
both a methyl group, k is 0, l is 3, m is 1, n (the average polymerization 
degree of polydimethylsiloxane) is 11) and 4.85 g of 
azobisisobutyronitrile. After the completion of the dropwise addition, the 
mixture was stirred for 6 hours at the same temperature to complete 
polymerization. The resulting copolymer AB had a number-average molecular 
weight of 13,000 and contained the unit derived from the monomer A and 
unit derived from MMA in amounts of 30 parts by weight and 70 parts by 
weight, respectively. Toluene used as a solvent was evaporated by an 
evaporator to obtain a solid copolymer AB-1. 
PRODUCTION EXAMPLE 2 
500 g of toluene was charged into a flask provided with a stirrer and 
heated to 80.degree. C. To this toluene being stirred was added dropwise 
in 2 hours a mixed solution consisting of 300 g of MMA, 129 g of 
3-(polydimethylsiloxanyl)propyl methacrylate (a monomer A of the general 
formula (I) wherein X and Y are both a methyl group, k is 0, l is 3, m is 
1, n (the average polymerization degree of polydimethylsiloxane) is 65) 
and 4.85 g of azobisisobutyronitrile. After the completion of the dropwise 
addition, the mixture was stirred for 6 hours at the same temperature to 
complete polymerization. The resulting copolymer AB had a number-average 
molecular weight of 11,000 and contained the unit derived from the monomer 
A and unit derived from MMA in amounts of 30 parts by weight and 70 parts 
by weight, respectively. Toluene used as a solvent was evaporated by an 
evaporator to obtain a solid copolymer AB-2. 
PRODUCTION EXAMPLE 3 
1,050 g of toluene was charged into a flask provided with a stirrer and 
heated to 70.degree. C. To this toluene being stirred was added dropwise 
in 2 hours a mixed solution consisting of 415 g of MMA, 135 g of 3 
-(polydimethylsiloxanyl)propyl methacrylate (a monomer A of the general 
formula (I) wherein X and Y are both a methyl group, k is 0, l is 3, m is 
1, n (the average polymerization degree of polydimethylsiloxane) is 132) 
and 1.00 g of azobisisobutyronitrile. After the completion of the dropwise 
addition, the mixture was stirred for 22 hours at the same temperature to 
complete polymerization. The resulting copolymer AB had a number-average 
molecular weight of 11,800 and contained the unit derived from the monomer 
A and unit derived from MMA in amounts of 30 parts by weight and 70 parts 
by weight, respectively. Toluene used as a solvent was evaporated by an 
evaporator to obtain a solid copolymer AB-3. 
PRODUCTION EXAMPLE 4 
1,300 g of toluene was charged into a flask provided with a stirrer and 
heated to 80.degree. C. To this toluene being stirred was added dropwise 
in 2 hours a mixed solution consisting of 392 g of MMA, 168 g of 3 
(polydimethylsiloxanyl)propyl methacrylate (a monomer A of the general 
formula (I) wherein X and Y are both a methyl group, k is 0, l is 3, m is 
2, n (the average polymerization degree of polydimethylsiloxane) is 268) 
and 6.70 g of azobisisobutyronitrile. After the completion of the dropwise 
addition, the mixture was stirred for 23 hours at the same temperature to 
complete polymerization. The resulting copolymer AB had a number-average 
molecular weight of 144,000 and contained the unit derived from the 
monomer A and unit derived from MMA in amounts of 30 parts by weight and 
70 parts by weight, respectively. Toluene used as a solvent was evaporated 
by an evaporator to obtain a solid copolymer AB-4. 
PRODUCTION EXAMPLE 5 
500 g of toluene was charged into a flask provided with a stirrer and 
heated to 70.degree. C. To this toluene being stirred was added dropwise 
in 2 hours a mixed solution consisting of 150 g of MMA, 150 g of 
3-(polydimethylsiloxanyl)propyl methacrylate (a monomer A of the general 
formula (I) wherein X and Y are both a methyl group, k is 0, l is 3, m is 
1, n (the average polymerization degree of polydimethylsiloxane) is 132) 
and 2.50 g of azobisisobutyronitrile. After the completion of the dropwise 
addition, the mixture was stirred for 21 hours at the same temperature to 
complete polymerization. The resulting copolymer AB had a number-average 
molecular weight of 10,000 and contained the unit derived from the monomer 
A and unit derived from MMA in amounts of 50 parts by weight and 50 parts 
by weight, respectively. Toluene used as a solvent was evaporated by an 
evaporator to obtain a solid copolymer AB-5. 
PRODUCTION EXAMPLE 6 
500 g of toluene was charged into a flask provided with a stirrer and 
heated to 80.degree. C. To this toluene being stirred was added dropwise 
in 2 hours a mixed solution consisting of 240 g of MMA, 60 g of styrene, 
129 g of 3. (polydimethylsiloxanyl)propyl methacrylate (a monomer A of the 
general formula (I) wherein X and Y are both a methyl group, k is 0, l is 
3, m is 1, n (the average polymerization degree of polydimethylsiloxane) 
is 65) and 3.25 g of azobisisobutyronitrile. After the completion of the 
dropwise addition, the mixture was stirred for 6 hours at the same 
temperature to complete polymerization. The resulting copolymer AB had a 
number-average molecular weight of 10,400 and contained the unit derived 
from the monomer A, the unit derived from MMA and a unit derived from 
styrene in amounts of 30 parts by weight, 55 parts by weight and 15 parts 
by weight, respectively. Toluene used as a solvent was evaporated by an 
evaporator to obtain a solid copolymer AB-6. 
PRODUCTION EXAMPLE 7 
In a flask provided with a stirrer were placed 500 g of ethyl acetate, 300 
g of methyl acrylate, 130 g of 3-(polydimethylsiloxanyl)propyl acrylate (a 
monomer A of the general formula (I) wherein X is a hydrogen atom, Y is a 
methyl group, k is 0, l is 3, m is 1, n (the average polymerization degree 
of polydimethylsiloxane) is 132) and 0.05 g of azobisisosbutyronitrile. 
They were heated to 60.degree. C. in 10 minutes with stirring. Then, the 
mixture was kept at that temperature and stirring was effected for 20 
hours to complete polymerization. The resulting copolymer AB had a 
number-average molecular weight of 286,400 and contained the unit derived 
from the monomer A and unit derived from methyl acrylate in amounts of 30 
parts by weight and 70 parts by weight, respectively. Ethyl acetate used 
as a solvent was evaporated by an evaporator to obtain a solid copolymer 
AB-7. 
PRODUCTION EXAMPLE 8 
In a flask provided with a stirrer were placed a mixed solution consisting 
of 360 g of toluene, 70 g of MMA, 30 g of 
3-[.omega.(2-heptadecafluorooctylethyl)polydimethylsiloxanyl]propyl 
methacrylate (a monomer A of the general formula (I) wherein X is a methyl 
group, Y is a 2-heptadecafluorooctylethyl group, k is 0, l is 3, m is 1, n 
(the average polymerization degree of polydimethylsiloxane) is 65) and 
1.10 g of azobisisobutyronitrile. They were heated to 70.degree. C. in 
about 20 minutes with stirring. Then, the mixture was stirred for 17 hours 
at that temperature to complete polymerization. The resulting copolymer AB 
had a number-average molecular weight of 9,400 and contained the unit 
derived from the monomer A and unit derived from MMA in amounts of 30 
parts by weight and 70 parts by weight, respectively. Toluene used as a 
solvent was evaporated by an evaporator to obtain a solid copolymer AB-8. 
PRODUCTION EXAMPLE 9 
In a flask provided with a stirrer were placed a mixed solution consisting 
of 360 g of toluene, 70 g of MMA, 30 g of 
3-(.omega.-heptafluorophenylpolydimethylsiloxanyl)propyl acrylate (a 
monomer A of the general formula (I) wherein X is a methyl group, Y is a 
heptafluorophenyl group, k is 0, l is 3, m is 1, n (the average 
polymerization degree of polydimethylsiloxane) is 64) and 1.20 g of 
azobisisobutyronitrile. The mixture was heated to 80.degree. C. in about 
20 minutes with stirring. Then, the mixture was stirred for 8 hours at 
that temperature to complete polymerization. The resulting copolymer AB 
had a number-average molecular weight of 16,800 and contained the unit 
derived from the monomer A and unit derived from MMA in amounts of 30 
parts by weight and 70 parts by weight, respectively. Toluene used as a 
solvent was evaporated by an evaporator to obtain a solid copolymer AB-9. 
PRODUCTION EXAMPLE 10 
500 g of toluene was charged into a flask provided with a stirrer and 
heated to 70.degree. C. To this toluene being stirred was added dropwise 
in 2 hours a mixed solution consisting of 105 g of MMA, 195 g of 
3-(polydimethylsiloxanyl)propyl methacrylate (a monomer A of the general 
formula (I) wherein X and Y are both a methyl group, k is 0, l is 3, m is 
1, n (the average polymerization degree of polydimethylsiloxane) is 132) 
and 1.75 g of azobisisobutyronitrile. After the completion of the dropwise 
addition, the mixture was stirred for 21 hours at the same temperature to 
complete polymerization. The resulting copolymer AB had a number-average 
molecular weight of 12,600 and contained the unit derived from the monomer 
A and the unit derived from MMA in amounts of 65 parts by weight and 35 
parts by weight, respectively. Toluene used as a solvent was evaporated by 
an evaporator to obtain a solid copolymer AB-10. 
PRODUCTION EXAMPLE 11 
500 g of toluene was charged into a flask provided with a stirrer and 
heated to 70.degree. C. To this toluene being stirred was added dropwise 
in 2 hours a mixed solution consisting of 370 g of MMA, 3 g of 
3-(polydimethylsiloxanyl)propyl methacrylate (a monomer A of the general 
formula (I) wherein X and Y are both a methyl group, k is 0, l is 3, m is 
1, n (the average polymerization degree of polydimethylsiloxane) is 134) 
and 1.55 g of azobisisobutyronitrile. After the completion of the dropwise 
addition, the mixture was stirred for 6 hours at the same temperature to 
complete polymerization. The resulting copolymer AB had a number-average 
molecular weight of 18,200 and contained the unit derived from the monomer 
A and the unit derived from MMA in amounts of 1 parts by weight and 99 
parts by weight, respectively. Toluene used as a solvent was evaporated by 
an evaporator to obtain a solid copolymer AB-11. 
PRODUCTION EXAMPLE OF MATERIAL FOR POWDER MOLDING 
In a Henschel Mixer.RTM. was placed 3,000 g of a vinyl chloride resin (a 
vinyl chloride homopolymer obtained by suspension polymerization) having 
an average polymerization degree of 800. Stirring was effected while steam 
was passed through the jacket, whereby the vinyl chloride resin was 
heated. When the temperature reached 70.degree. C., there were added 150 g 
of a Ba-Zn type stabilizer, 150 g of an epoxidized soybean oil, 2,250 g of 
a mixed phthalate plasticizer consisting of dinonyl phthalate, didecyl 
phthalate and diundecyl phthalate, and 60 g of a black pigment. The 
resulting mixture was heated to 120.degree. C. and stirred for 20 minutes 
keeping the temperature at about 120.degree. C. to allow the vinyl 
chloride resin to thoroughly absorb the plasticizer. Then, cooling water 
instead of steam was passed through the jacket to cool the mixture. When 
the mixture was cooled to 50.degree. C., there was added 360 g of a 
polyvinyl chloride obtained by emulsion polymerization. Stirring was 
effected for more than 5 minutes. The resulting mixture was cooled to 
around normal temperature and then taken out to obtain a material for 
powder molding. 
EXAMPLES 1-11 
Each of the copolymers AB-1 to AB-9 and acetone were mixed with a stirrer 
at 60 ppm according to the compounding composition shown in Table 1 which 
is given later, whereby 11 kinds of releasing agent solutions for powder 
molding were prepared. In each of the releasing agent solutions were 
immersed an iron plate 1 of 100 mm.times.50 mm.times.3.2 mm with a hard 
chromium plating of 30-50 .mu.m in thickness, and an iron plate 2 of 50 
mm.times.30 mm.times.3.2 mm with the same hard chromium plating. Also, an 
iron plate 3 of 300 mm.times.300 mm.times.4.0 mm with the same hard 
chromium plating was spray coated on one side with each of the releasing 
agent solutions. These iron plates were then subjected to solvent 
evaporation at normal temperature, whereby a thin film of copolymer AB was 
formed on each iron plate. 
COMATIVE EXAMPLE 1 
The same iron plates, 1, 2 and 3, as used in each of Examples 1-11, were 
not treated with any releasing agent solution and were used for the tests 
shown in Tables 2 and 3 (given later), as they were. 
COMATIVE EXAMPLES 2 AND 3 
The same procedure as in Examples 1-11 was repeated except that the 
copolymer AB-10 or AB-11 was used in place of the copolymers AB-1 to AB-9, 
whereby a thin film of one of the two releasing agents for powder molding 
whose compounding compositions are shown in Table 1 was formed on the same 
iron plates 1, 2 and 3, as used in each of Examples 1-11. 
COMATIVE EXAMPLES 4 AND 5 
The same procedure as in Examples 1-11 was repeated except that KF-96.TM. 
(a silicone oil produced by Shin-Etsu Chemical Co., Ltd.) or stearic acid 
was used in place of each of the copolymers AB-1 to AB-9, whereby one of 
the two releasing agents whose compounding compositions are shown in Table 
1 was allowed to adhere to the same iron plates 1, 2 and 3, as used in 
each of Examples 1-11. 
The iron plates treated or not treated with each releasing agent, prepared 
in Examples 1-11 and Comparative Examples 1-5, as well as the molded 
articles obtained by baking the material for powder molding on the above 
iron plates, were measured for the following mold release test, contact 
angle on releasing agent film, contact angle on iron plate after peeling, 
contact angle on molded film after peeling, bleeding and blooming test of 
molded article, blocking test, abrasion test and return baking property, 
to evaluate each releasing agent. 
(1) Mold release test 
Each iron plate 1 having thereon a thin film of a releasing agent for 
powder molding, obtained in Examples 1-11 and Comparative Examples 1-5 
(the iron plate 1 obtained in Comparative Example 1 had no thin film) was 
placed in a heating furnace kept at 240.degree..+-.5.degree. C., for 10 
minutes for preheating. Then, it was rapidly taken out and placed on a 
stand. On the iron plate 1 on the stand was sprinkled the above prepared 
material for powder molding, filled in a 120-cc cup, and the material was 
baked for 5 seconds. After wiping off the unmelted excess material, the 
resulting iron plate was quickly returned to the heating furnace and 
heated for 2 minutes to completely melt the powder molding material on the 
iron plate and thereby to form a molded film on the iron plate. The iron 
plate with a molded film was cooled to normal temperature in a room. The 
molded film was cut in a rectangular form of 3 cm.times.8 cm so that the 
rectangular form was positioned in the center of the iron plate. By 
leaving only this rectangular portion, the surrounding portion of the 
molded film was removed. The resulting iron plate was allowed to stand for 
24 hours at 25.degree. C. to prepare a test sample. The test sample was 
firmly fixed to the lower fixing part of STROGRAPH.RTM., manufactured by 
Tokyo Seiki Seisaku-Sho, Ltd. One end of a 30-cm long kite string was 
firmly fixed to the upper fixing part of STROGRAPH.RTM.. Another end of 
the kite string was fixed to a 3-cm wide clip. The lower 1-cm portion of 
the rectangular molded film on the test sample was peeled from the iron 
plate and pinched by the clip so that the molded film caused no protrusion 
from the clip. After the above procedure had been completed, pulling was 
effected at a speed of 500 mm/min to peel the molded film from the iron 
plate. The average values of the strength applied were divided by the 
width of the molded film, and the resulting quotient of each was taken as 
a peeling strength. This test was effected 5 times for each releasing 
agent for powder molding and an average value was calculated. The results 
are shown in Table 2. The peeling strength of each test sample was divided 
by the peeling strength of the test sample prepared from the iron plate 1 
of Comparative Example 1 having no releasing agent film, and the resulting 
percentage was taken as a change ratio (%) of peeling strength. The 
smaller the peeling strength and change ratio of a test sample, the better 
is the releasability of the test sample. (2) Contact angle on releasing 
agent film 
Each iron plate 2 having thereon a thin film of a releasing agent for 
powder molding, obtained in Examples 1-11 and Comparative Examples 1-5 
(the iron plate 2 obtained in Comparative Example 1 had no thin film) was 
left at rest on the test stand of GONIOMETER G-1.RTM. (a contact angle 
tester manufactured by K. K. ERMA). Thereon was carefully dropped 4 cc of 
pure water by means of a syringe to form 5 water droplets at the same 
intervals. Via a reading microscope with an angle gauge, of GONIOMETER, 
there was measured an angle between (a) a circle formed by each droplet 
and (b) a horizontal line of the surface of the iron plate 2, to obtain a 
contact angle. Then, an average value of the contact angles of the five 
water droplets was calculated. The results are shown in Table 2. In Table 
2, a larger contact angle indicates that the mold surface is more water 
repellant. 
(3) Contact angle on iron plate after peeling 
On each iron plate 2 having thereon a thin film of a releasing agent for 
powder molding, obtained in Examples 1-11 and Comparative Examples 1-5 
(the iron plate 2 obtained in Comparative Example 1 had no thin film) was 
baked the above prepared material for powder molding under the same 
conditions as in the above item (1), to form a molded film on the iron 
plate 2. The iron plate having a molded film thereon was allowed to stand 
for 24 hours in a room of 25.degree..+-.2.degree. C. Then, the molded film 
was peeled from the mold. The surface of the resulting iron plate was 
measured for contact angle in the same manner as in the above item (2). 
The results are shown in Table 2. In Table 2, a larger difference of this 
contact angle on iron plate from the contact angle on releasing agent film 
obtained in the item (2) and a smaller difference of the former contact 
angle from the contact angle on the iron plate of Comparative Example 1 
having no releasing agent film indicate that the amount of the releasing 
agent film remaining on the iron plate after peeling is less and that the 
transfer of the releasing agent film to the molded film is more complete. 
(4) Contact angle on molded film after peeling 
The surface of the molded film obtained in the above item (3) (the side of 
the molded film which had been in contact, before peeling, with the iron 
plate) was measured for contact angle in the same manner as in the above 
item (2). The results are shown in Table 2. In Table 2, a larger contact 
angle on the molded article after peeling indicates that the transfer of 
the releasing agent film to the molded film is more complete; and a larger 
contact angle on molded film after peeling as compared with the contact 
angle on molded film using the iron plate 1 of Comparative Example 1 
having no releasing agent film thereon indicates that the molded film is 
endowed with higher releasability. 
(5) Bleeding and blooming of molded article 
Each molded film obtained in the above item (3) was suspended in a 
thermo-hygrostat of 80.degree. C..times.80%. (Four sheets per each molded 
film were suspended.) Each one sheet was taken out in 3 days, 7 days, 10 
days and 14 days from the start of suspension, to examine the change of 
sheet surface with time. A releasing agent having poor compatibility with 
the resin of the molded film causes bleeding and blooming on the sheet 
surface. The degree of this bleeding and blooming was evaluated by visual 
observation according to the following 4 rating standards. 
.circleincircle.:No bleeding and blooming. 
:Difficult to judge whether or not there are bleeding and blooming 
.DELTA.:Bleeding and blooming are slight. 
X :Bleeding and blooming are significant. 
The results are shown in Table 2. 
(6) Blocking test 
On each iron plate 3 having thereon a thin film of a releasing agent for 
powder molding, obtained in Example 3 and Comparative Example 1 (the iron 
plate 3 obtained in Comparative Example 1 had no thin film) was baked the 
above prepared material for powder molding under the same conditions as in 
the above item (1) except that the preheating was effected for 20 minutes 
and the material was used in an amount of 500 cc, to form a molded film on 
the iron plate 3. The iron plate with a molded film was allowed to stand 
for 24 hours in a room of 25.degree..+-.2.degree. C. The molded film was 
peeled from the mold and cut into shapes of 70 mm.times.20 mm to obtain 
rectangular samples as test pieces. Two of these test pieces were 
contacted with each other at respective ends so that the contact area 
became 20 mm.times.20 mm and the two pieces contacted at respective sides 
which had been in contact, before peeling, with the iron plate 3. A weight 
of 1 kg was placed on the contact portion, and the connected test pieces 
were allowed to stand for 23 hours in a constant temperature bath of 
40.degree. C. After removal, they were allowed to stand for 1 hour at room 
temperature; then, they were fixed to the STROGRAPH.RTM. used in the above 
item (1); peeling was effected at a speed of 50 mm/min and the strength 
applied was measured. The results are shown in Table 3. A smaller strength 
indicates weaker adhesion and higher slipperiness. 
(7) Abrasion test 
Each of the molded films obtained in the above item (6) was measured for 
abrasion in accordance with JIS K 7204, applying a load of 1,000 g and 
using two truck wheels (CS-17 and H-18). The results are shown in Table 3. 
(8) Return baking property 
On each iron plate 1 having thereon a thin film of a releasing agent for 
powder molding, obtained in Example 3 and Comparative Example 1 (the iron 
plate 1 obtained in Comparative Example 1 had no thin film) was formed a 
molded film in the same manner as in the above item (1). The iron plate 1 
with a molded film was cooled to around normal temperature at which the 
iron plate could be touched by hand. The molded film was peeled from the 
iron plate, and the surface condition of the resulting iron plate was 
observed visually and evaluated according to the following four rating 
standards. 
.circleincircle.: The surface retains the original mirror surface. 
: Difficult to judge whether or not the surface is very slightly cloudy. 
.DELTA.: The surface is slightly cloudy. 
X : The surface is significantly cloudy. 
After the above peeling of molded film, the iron plate 1 was immersed in 
the same releasing agent solution as used before, to form a thin film 
thereon (the iron plate 1 obtained in Comparative Example 1 was not 
immersed). The resulting iron plate was then subjected to a second 
molding. The side which was subjected to the second molding was the same 
as in the first molding. Thus, formation of molded film was repeated and 
the change of mirror surface was observed. The surface conditions after 0, 
first, third, 5th, 10th, 20th, 30th and 50th moldings were observed. The 
results are shown in Table 3. 
TABLE 1 
__________________________________________________________________________ 
Examples Comparative examples 
1 2 3 4 5 6 7 8 9 10 11 
1 2 3 4 5 
__________________________________________________________________________ 
Copolymer AB-1 
2 
Copolymer AB-2 2 5 10 
Copolymer AB-3 2 
Copolymer AB-4 2 
Copolymer AB-5 2 
Copolymer AB-6 2 
Copolymer AB-7 2 
Copolymer AB-8 2 
Copolymer AB-9 2 
Copolymer AB-10 2 
Copolymer AB-11 2 
KF-96 (wt %) 2 
Stearic Acid (wt %) 2 
Acetone (wt %) 
98 98 98 98 98 98 98 98 98 95 90 98 98 98 98 
Concentration of active 
2 2 2 2 2 2 2 2 2 5 10 2 2 2 2 
ingredient in releasing 
agent solution (wt %) 
__________________________________________________________________________ 
TABLE 2 
__________________________________________________________________________ 
Contact 
Mold release 
angle on 
Contact angle 
test releasing 
after peeling 
Releasing 
Change 
agent 
On iron 
On molded 
Bleeding and blooming of molded 
article 
strength 
ratio 
film plate 
article After 
After 
After 
After 
(g/cm) 
(%) (.degree.) 
(.degree.) 
(.degree.) 
Original 
3 days 
7 days 
10 
14 
__________________________________________________________________________ 
days 
Example 1 2.7 69 97 78 96 .circleincircle. 
.circleincircle. 
.circleincircle. 
.circleincircle. 
.circleincircle. 
1 
Example 2 2.5 64 103 78 97 .circleincircle. 
.circleincircle. 
.circleincircle. 
.circleincircle. 
.circleincircle. 
Example 3 1.8 46 112 74 101 .circleincircle. 
.circleincircle. 
.circleincircle. 
.circleincircle. 
.circleincircle. 
Example 4 2.0 51 110 80 104 .circleincircle. 
.circleincircle. 
.circleincircle. 
Example 5 1.5 38 115 82 107 .circleincircle. 
.circleincircle. 
.circleincircle. 
Example 6 2.7 69 99 78 96 .circleincircle. 
.circleincircle. 
.circleincircle. 
.circleincircle. 
.circleincircle. 
Example 7 1.9 49 113 76 103 .circleincircle. 
.circleincircle. 
.circleincircle. 
Example 8 2.2 56 106 79 98 .circleincircle. 
.circleincircle. 
.circleincircle. 
.circleincircle. 
.circleincircle. 
2 
Example 9 2.3 59 104 80 98 .circleincircle. 
.circleincircle. 
.circleincircle. 
.circleincircle. 
.circleincircle. 
3 
Example 10 1.9 49 109 81 103 .circleincircle. 
.circleincircle. 
.circleincircle. 
.circleincircle. 
.circleincircle. 
. 
Example 11 1.7 44 111 84 104 .circleincircle. 
.circleincircle. 
.circleincircle. 
Comparative Example 1 
3.9 100 70 68 81 .circleincircle. 
.DELTA. 
.DELTA. 
Comparative Example 2 
1.2 31 117 108 110 X X X X X 
Comparative Example 3 
4.0 100 77 72 82 .circleincircle. 
.circleincircle. 
.circleincircle. 
.circleincircle. 
.circleincircle. 
Comparative Example 4 
2.9 74 104 102 98 X X X X X 
Comparative Example 5 
3.2 82 98 95 94 X X X X X 
__________________________________________________________________________ 
TABLE 3 
__________________________________________________________________________ 
Abrasion test 
Blocking 
(mg of Return baking property 
test reduced weight) 
After 10th 
After 20th 
After 30th 
After 
After 50th 
(Kg/4 cm.sup.2) 
CS-17 
H-18 Original 
molding 
molding 
molding 
molding 
molding 
__________________________________________________________________________ 
Example 3 1.14 2.6 398 .circleincircle. 
.circleincircle. 
.circleincircle. 
.circleincircle. 
.circleincircle. 
.circleincircle. 
Comparative Example 1 
0.75 2.2 270 .circleincircle. 
.circleincircle. .DELTA. 
.DELTA. 
__________________________________________________________________________ 
EXAMPLE 12 
490 g of acetone and 10 g of the copolymer AB-3 obtained in Production 
Example 3 were placed in a one liter beaker and mixed by a stirring 
machine operated at 120rpm, to obtain a releasing agent for powder molding 
as a solution. 
50 g of the releasing agent was fed into a coating cup installed on a spray 
gun (W-7.RTM. of Iwata Tosoki Kogyo K.K.); the spray gun was connected to 
one of the air hoses (inside dia : 8 mm) attached to an air compressor 
(max. air pressure : 10 kg/cm.sup.2); a regulator was provided between the 
spray gun and the air hose; an air pressure of 3 kg/cm.sup.2 was applied 
to the spray gun so that the releasing agent in the coating cup could be 
sprayed from a nozzle of the spray gun by the air pressure. 
In a draft was placed an electroformed mold for a glove box of 3.2 mm in 
thickness, having an impression pattern on the molding surface. 
Using the above spray gun apparatus, the releasing agent was sprayed on the 
molding surface of the electroformed mold to form a thin film thereon. 
Then, the electroformed mold was surrounded by an iron frame to form a 
quadrangular prism of 350 mm.times.500 mm.times.100 mm. The quadrangular 
prism was set up so that the molding surface of the electroformed mold was 
directed upward. The upper part of the mold was covered with an iron plate 
of 2 mm in thickness to protect the molding surface from adhesion of dust, 
etc. 
The thus prepared electroformed mold having a thin film of the releasing 
agent on the molding surface and surrounded by the iron frame and the iron 
plate, was placed in a heating furnace maintained at 
240.degree..+-.5.degree. C. to preheat for 20 minutes. The electroformed 
mold was taken out quickly; the iron plate was removed; 500 g of the 
above-mentioned material for powder molding was placed in the 
electroformed mold; the iron plate was again placed on the iron frame 
quickly; the electroformed mold surrounded by the iron frame and the iron 
plate was rotated outside of the heating furnace for 30 seconds to allow 
the material for powder molding to adhere to the molding surface of the 
electroformed mold. Then, the iron plate was removed and the unmelted 
excessive material for powder molding was wiped off the electroformed 
mold; the iron plate was again placed on the electroformed mold; and the 
quadrangular prism was again placed in the heating furnace. A 5-minute 
period of heating was effected to completely melt the material for powder 
molding, adhering to the molding surface of the electroformed mold. Then, 
the quadrangular prism was taken out of the heating furnace and immersed 
in cold water to cool the electroformed mold. 
After the cooling, the resultant molded article was peeled from the 
electroformed mold. 
According to the process of this Example, as compared with the conventional 
process comprising spray-coating the same releasing agent as used in 
Comparative Example 4, it was confirmed that peeling by a small manual 
force was possible. Further, since the thin film of the copolymer AB-3 was 
transferred onto the surface of the molded article, the molded article had 
a surface of good slipperiness and comfortable touch. Furthermore, since 
the film of the copolymer AB-3 transferred onto the molded article surface 
was thin, the visual observation of the molded article showed no change in 
appearance (e.g. color) and the molded article had uniform gloss and 
uniform impression.