Claims
- 1. A composition comprising a rubber-reinforced polystyrene, said rubber-reinforced polystyrene consisting essentially of
- (a) a rubbery polymer selected from the group consisting of a homopolymer of a 1,3-diene of 4 to 6 carbon atoms and a copolymer of a 1,3-diene of 4 to 6 carbon atoms with another copolymerizable monomer, and mixtures thereof; and
- (b) a polymer of a styrene-type monomer selected from the group consisting of styrene, nuclear alkyl-substituted styrenes, .alpha.-alkyl substituted styrenes, nuclear-halogenated styrenes and vinyl naphthalene, and mixtures thereof;
- said rubber-reinforced polystyrene having a rubbery polymer dispersed in the form of particles therein, and characterized in that:
- (A) said particles have an area-averaged particle diameter in the range of 0.49 to 1.00 micron,
- (B) said dispersed particles of rubbery substance have polystyrene included in the form of minute particles therein and not less than 80% of the total number of said polystyrene particles have diameters of not more than 0.3 micron, and
- (C) said composition contains polydimethyl siloxane in an amount falling in the range of 0.005 to 0.8% by weight.
- 2. A composition comprising a rubber-reinforced polystyrene, said rubber-reinforced polystyrene consisting essentially of
- (a) a rubbery polymer selected from the group consisting of a homopolymer of a 1,3-diene of 4 to 6 carbon atoms and a copolymer of a 1,3-diene of 4 to 6 carbon atoms with another copolymerizable monomer, and mixtures thereof; and
- (b) a polymer of
- (1) a styrene-type monomer selected from the group consisting of styrene, nuclear alkyl-substituted styrenes, .alpha.-alkyl-substituted styrenes, nuclear-halogenated styrenes and vinyl naphthalene, and mixtures thereof; and
- (2) a monomer selected from the group consisting of methacrylic esters, acrylic esters, methacrylic acid, acrylic acid, maleic anhydride and maleimides, and mixtures thereof;
- said rubber-reinforced polystyrene having a rubbery polymer dispersed in the form of particles therein, and characterized in that:
- (A) said particles have an area-averaged particle diameter in the range of 0.49 to 1.00 micron,
- (B) said dispersed particles of rubbery substance have polystyrene included in the form of minute particles therein and not less than 80% of the total number of said polystyrene particles have diameters of not more than 0.3 micron, and
- (C) said composition contains polydimethyl siloxane in an amount falling in the range of 0.005 to 0.8% by weight.
- 3. A composition according to claim 1 or 2, wherein not less than 90% of the total number of included polystyrene particles have diameters of not more than 0.3 micron.
- 4. A composition according to claim 1 or 2, wherein the viscosity of said polydimethyl siloxane is in the range of 10 to 10,000 centistokes at 25.degree. C.
Priority Claims (2)
Number |
Date |
Country |
Kind |
60-234480 |
Oct 1985 |
JPX |
|
61-175524 |
Jul 1986 |
JPX |
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Parent Case Info
This application is a continuation of application Ser. No. 921,190, filed Oct. 21, 1986, now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
3398214 |
Roper et al. |
Aug 1968 |
|
4248778 |
Arnold et al. |
Feb 1981 |
|
Foreign Referenced Citations (2)
Number |
Date |
Country |
57-187345 |
Nov 1982 |
JPX |
57-187346 |
Nov 1982 |
JPX |
Continuations (1)
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Number |
Date |
Country |
Parent |
921190 |
Oct 1986 |
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