Claims
- 1. A high-impact polystyrene composition comprising a major amount of (1) polystyrene or (2) a copolymer of styrene and at least one monomer copolymerizable with styrene, the amount of said monomer being at most 50% by weight based on the total weight of the styrene and the monomer, and a minor amount of a diene polymer, the diene polymer having been prepared from more than 50% by weight of 1,3-butadiene and less than 50% by weight of at least one conjugated diolefin selected from the group consisting of isoprene; 1,3-pentadiene; 2,3-dimethyl-1,3-butadiene; 2-ethyl-1,3-butadiene; 2,3-diethyl-1,3-butadiene; 2-phenyl-1,3-butadiene; and 2,3-diphenyl-1,3-butadiene; by solution polymerization using an organic lithium compound as catalyst and having been grafted onto the polystyrene or styrene copolymer by free-radical polymerization and forming a two-phase structure, and the diene polymer having a
- (1) 1,2-vinyl content of more than 15 to 35% and cis-1,4 content of 20 to 45%, and
- (2) Mooney viscosity (ML.sub.1+4) of 25 to 85, solution viscosity of styrene containing 5% by weight of the diene polymer (SV) at 25.degree. C. being 50 to 200 cps, and 1.5 ML.sub.1+4 .ltoreq. SV <3.0 ML.sub.1+4.
- 2. A composition according to claim 1, wherein the weight ratio of the diene polymer to the polystyrene is from 2:98 to 20:80.
- 3. A composition according to claim 1, wherein the comonomer is alpha-methyl styrene, vinyltoluene, acrylonitrile or methyl methacrylate.
- 4. A composition according to claim 1, wherein the conjugate diolefin is isoprene or 1,3-pentadiene.
- 5. A composition according to claim 1, wherein the diene polymer has
- (1) 1,2-vinyl content of 16 to 35% and cis-1,4 content of 25 to 45%, and
- (2) Mooney viscosity (ML.sub.1+4) of 30 to 70, solution viscosity of styrene containing 5% by weight of the diene polymer (SV) at 25.degree. C. being 50 to 150 cps, and 1.5 ML.sub.1+4 .ltoreq. SV .ltoreq.2.5 ML.sub.1+4.
- 6. A composition according to claim 1, wherein the diene polymer has
- (1) 1,2-vinyl content of 17 to 30% and cis-1,4 content of 30 to 40%, and
- (2) Mooney viscosity (ML.sub.1+4) of 30 to 65, solution viscosity of styrene containing 5% by weight of the diene polymer (SV) at 25.degree. C. being 50 to 135 cps, and 1.6 ML.sub.1+4 .ltoreq. SV .ltoreq.2.2 ML.sub.1+4.
- 7. A composition according to claim 1, wherein the composition is prepared by free radical polymerization of styrene which dissolves 2 to 20 parts by weight of one or more diene polymer prepared by solution polymerization using an organic lithium compound as catalyst, said diene polymer having
- (1) 1,2-vinyl content of more than 15 to 35% and cis-1,4 content of 20 to 45%, and
- (2) Mooney viscosity (ML.sub.1+4) of 25 to 85, solution viscosity of styrene containing 5% by weight of the diene polymer (SV) at 25.degree. C. being 50 to 200 cps, and 1.5 ML.sub.1+4 .ltoreq. SV .ltoreq.3.0 ML.sub.1+4,
- the total weight of the styrene and the polybutadiene being 100 parts by weight.
- 8. A process for producing high-impact polystyrene which comprises dissolving 2 to 20 parts by weight of one or more diene polymers prepared from more than 50% by weight of 1,3-butadiene and less than 50% by weight of at least one conjugated diolefin selected from the group consisting of isoprene; 1,3-pentadiene; 2,3-dimethyl-1,3-butadiene; 2-ethyl-1,3-butadiene; 2,3-diethyl-1,3-butadiene; 2-phenyl-1,3-butadiene; and 2,3-diphenyl-1,3-butadiene, by solution polymerization using an organic lithium compound as catalyst, said diene polymers having a
- (1) 1,2-vinyl content of more than 15 to 35% and cis-1,4 content of 20 to 45%, and
- (2) Mooney viscosity (ML.sub.1+4) of 25 to 85, solution viscosity of styrene containing 5% by weight of the diene polymers (SV) at 25.degree. C. being 50 to 200 cps, and 1.5 ML.sub.1+4 .ltoreq. SV <3.0 ML.sub.1+4,
- in 80 to 98 parts by weight of (1) styrene or (2) a mixture of styrene and at most 50% by weight of at least one monomer copolymerizable with styrene, and carrying out free-radical polymerization to form a two-phase structure having the diene polymer grafted onto polystyrene.
- 9. A process according to claim 8, wherein the radical polymerization is bulk polymerization.
- 10. A process according to claim 8, wherein the radical polymerization is bulk-suspension polymerization.
- 11. A process according to claim 8, wherein the comonomer is alpha-methyl styrene, vinyltoluene, acrylonitrile, or methyl methacrylate.
- 12. A process according to claim 8, wherein the organic lithium compound is n-butyllithium or sec-butyllithium.
- 13. A process according to claim 8, wherein the conjugated diolefin is isoprene or 1,3-pentadiene.
- 14. A process according to claim 8, wherein the diene polymer has
- (1) 1,2-vinyl content of 16 to 35% and cis-1,4 content of 25 to 45%, and
- (2) Mooney viscosity (ML.sub.1+4) of 30 to 70, solution viscosity of styrene containing 5% by weight of the diene polymer (SV) at 25.degree. C. being 50 to 150 cps, and 1.5 ML.sub.1+4 .ltoreq. SV .ltoreq.2.5 ML.sub.1+4.
- 15. A process according to claim 8, wherein the polybutadiene has
- (1) 1,2-vinyl content of 17 to 30% and cis-1,4 content of 30 to 40%, and
- (2) Mooney viscosity (ML.sub.1+4) of 30 to 65, solution viscosity of styrene containing 5% by weight of the polybutadiene (SV) at 25.degree. C. being 50 to 135 cps, and 1.6 ML.sub.1+4 .ltoreq. SV .ltoreq.2.2 ML.sub.1+4.
Priority Claims (1)
Number |
Date |
Country |
Kind |
50-54656 |
May 1975 |
JPX |
|
Parent Case Info
This is a continuation, of application Ser. No. 685,149, filed May 11, 1976 now abandoned.
US Referenced Citations (6)
Continuations (1)
|
Number |
Date |
Country |
Parent |
685149 |
May 1976 |
|