Claims
- 1. A rubber-modified styrene copolymer prepared by polymerizing a monomer of styrene or its derivatives and a monomer of acrylonitrile or its derivatives in the presence of a rubbery polymer comprising:
- a block copolymer comprising a first polymer block comprising at least one monomer of butadiene or its derivatives and a second polymer block comprising at least one monomer of styrene or its derivatives, said block copolymer constituting at least about 50 wt % of said rubbery polymer and having a monomer of styrene or its derivatives content of from about 3 to about 20 wt % and a starlike radial structure represented by the formula (BDB--STB.sub.m P) wherein BDB denotes a polymer block comprising at least one monomer of butadiene or its derivatives, STB denotes a polymer block comprising at least one monomer of styrene or its derivatives, m is an integer of from 3 to 6 and P is a moiety of a multi-functional coupling agent, said rubbery polymer containing no greater than about 0.5 wt % styrene-insoluble components at 25.degree. C. and having a viscosity of from about 5 to about 50 centistokes as measured at 25.degree. C. in the form of a 5 wt % styrene solution; and
- said rubber-modified styrene copolymer comprising dispersed particles of said rubbery polymer and a continuous phase of a copolymer of said monomer of styrene or its derivatives and said monomer of acrylonitrile or its derivatives, wherein said dispersed particles contain a copolymer of said monomer of styrene or its derivatives and said monomer of acrylonitrile or its derivatives grafted or occluded and have a copolymer occlusion and graft index from about 25 to about 150%; and wherein
- the molecular weight distribution index of said copolymer of the monomer of styrene or its derivatives and said monomer of acrylonitrile or its derivatives is from about 1.9 to about 3.0.
- 2. The rubber-modified styrene copolymer of claim 1, wherein said rubbery polymer is first uniformly dissolved in said monomer of styrene or its derivatives and said monomer of acrylonitrile or its derivatives, and then a bulk polymerization process is carried out to form dispersed particles, which are further subjected to polymerization.
- 3. The rubber-modified styrene copolymer of claim 1, wherein said rubbery polymer is first uniformly dispersed in said monomer of styrene or its derivatives and said monomer of acrylonitrile or its derivatives, and then a solution polymerization process is carried out to form dispersed particles, which are further subjected to polymerization.
- 4. The rubber-modified styrene copolymer of claim 1, wherein said rubbery polymer is first uniformly dissolved in said monomer of styrene or its derivatives and said monomer of acrylonitrile or its derivatives, and then a continuous bulk polymerization is carried out to form dispersed particles, which are further subjected to polymerization.
- 5. The rubber-modified styrene copolymer of claim 1, wherein said rubbery polymer content of said rubber-modified styrene copolymer is from about 2 to about 30 wt %.
- 6. The rubber modified styrene copolymer of claim 1, wherein said block copolymer constitutes at least about 50 wt % of said rubbery polymer.
- 7. The rubber-modified styrene copolymer of claim 6, wherein said block copolymer constitute at least about 70 wt % of said rubbery polymer.
- 8. The rubber-modified styrene copolymer of claim 1, wherein the content of said monomer of styrene or its derivatives of said block copolymer is from about 3 to about 10 wt %.
- 9. The rubber-modified styrene copolymer of claim 1, wherein the styrene-insoluble content of said rubbery polymer at 25.degree. C. is no greater than about 0.5 wt %.
- 10. The rubber-modified styrene copolymer of claim 9, wherein the styrene-insoluble content of said rubbery polymer at 25.degree. C. is no greater than about 0.5 wt %.
- 11. The rubber-modified styrene copolymer of claim 1, wherein the viscosity of said rubbery polymer is from about 5 to about 50 centistokes as measured at 25.degree. C. in the form of a 5 wt % styrene solution.
- 12. The rubber-modified styrene copolymer of claim 11, wherein the viscosity of said rubbery polymer is from about 8 to about 40 centistokes as measured at 25.degree. C. in the form of a 5 wt % styrene solution.
- 13. The rubber-modified styrene copolymer of claim 1, wherein said polymer block comprising at least one monomer of butadiene or its derivatives is prepared by copolymerizing less than about 10 parts by weight of a monomer of styrene or its derivatives per about 100 parts by weight of said polymer block comprising at least one monomer of butadiene or its derivatives.
- 14. The rubber-modified styrene copolymer of claim 13, wherein said polymer block comprising at least one monomer of butadiene or its derivatives is prepared by copolymerizing less than about 5 parts by weight of a monomer of styrene or its derivatives per about 100 parts by weight of said polymer block comprising at least one monomer of butadiene or its derivatives.
- 15. The rubber-modified styrene copolymer of claim 1, wherein said polymer block comprising at least one monomer of styrene or its derivatives is prepared by copolymerizing less than about 10 parts by weight of a monomer of butadiene or its derivatives per about 100 parts by weight of said polymer block comprising at least one monomer of styrene or its derivatives.
- 16. The rubber-modified styrene copolymer of claim 1, wherein said copolymer occlusion and graft index is from about 25 to about 150%.
- 17. The rubber-modified styrene copolymer of claim 16, wherein said copolymer occlusion and graft index is from about 25 to about 80%.
- 18. The rubber-modified styrene copolymer of claim 1, wherein the average molecular weight of said continuous phase of said copolymer of monomer of styrene or its derivatives and monomer of acrylonitrile or its derivatives is represented by a reduced viscosity of from about 0.5 to about 1.0 dl/gr.
- 19. The rubber-modified styrene copolymer of claim 18, wherein said average molecular weight is represented by a reduced viscosity of from about 0.6 to about 0.85 dl/gr.
- 20. The rubber-modified styrene copolymer of claim 1, wherein the molecular weight distribution index of the copolymer in the continuous phase is from about 2.3 to about 2.8.
- 21. The rubber-modified styrene copolymer of claim 1, wherein the average particle size of said rubbery polymer particles in said dispersed phases is in the range of from about 0.1 to about 3.0 .mu.m.
- 22. The rubber-modified styrene copolymer of claim 21, wherein the average size of the rubbery polymer particles is in the range of from about 0.23 to about 1.1 .mu.m.
- 23. The rubber-modified styrene copolymer of claim 1, wherein the crosslinking index of said rubbery polymer particles forming said dispersed phases is from about 4 to about 15 times.
- 24. The rubber-modified styrene copolymer of claim 23, wherein said crosslinking index is from about 7 to about 12 times.
- 25. The rubber-modified styrene copolymer of claim 1, wherein said monomer of styrene or its derivatives is selected from the group consisting of styrene, .alpha.-methyl styrene, .alpha.-ethyl styrene, monochlorostyrene, dichlorostyrene, vinyltoluene, vinylxylene, o-t-butylstyrene, p-t-butylstyrene, p-methylstyrene, tribromostyrene, tetrabromostyrene, p-hydroxystyrene, and o-methoxystyrene.
- 26. The rubber-modified styrene copolymer of claim 1, wherein said monomer of acrylonitrile or its derivatives is selected from the group consisting of acrylonitrile, methacrylonitrile, fumaronitrile, maleonitrile and .alpha.-chloroacrylonitrile.
- 27. The rubber-modified styrene copolymer of claim 1, wherein from about 1 to about 30 wt % of the total amount of said monomer of styrene or its derivatives and said monomer of acrylonitrile or its derivatives are replaced with a monomer of maleimide or n-phenylmaleimide.
- 28. The rubber-modified styrene copolymer of claim 27, wherein said maleimide or n-phenyl-maleimide monomer is replaced with at least monomer selected from the group consisting of one methacrylic ester monomers, acrylic ester monomers and maleimide monomers.
- 29. The rubber-modified styrene copolymer claimed in claim 27, wherein from about 5 to about 17 wt % of the total amount of said monomer of styrene or its derivatives and said monomer of acrylonitrile or its derivatives are replaced with a monomer of maleimide or n-phenylmaleimide.
- 30. The rubber-modified styrene copolymer of claim 1, wherein the weight ratio of monomer of styrene or its derivatives to monomer of acrylonitrile or its derivatives of the copolymer in the continuous phase is from about 95/5 to about 55/45.
- 31. The rubber-modified styrene copolymer of claim 1, wherein the proportion of the copolymers in the continuous phase whose molecular weight exceed 1,200,000 is less than about 10 wt %.
Priority Claims (1)
Number |
Date |
Country |
Kind |
210597/1988 |
Aug 1988 |
JPX |
|
Parent Case Info
This application is a continuation of application Ser. No. 07/392,896, filed Aug. 14, 1989, now abandoned.
US Referenced Citations (5)
Foreign Referenced Citations (4)
Number |
Date |
Country |
160974 |
Nov 1985 |
EPX |
3505749 |
Feb 1985 |
DEX |
58-4934 |
Jan 1983 |
JPX |
1175126 |
Dec 1969 |
GBX |