Impact modifier for a polymer composition and method for preparing the same
Disclosed herein is an impact modifier for a polymer composition and a method of preparing the same. The impact modifier includes a core comprising a polyorganosiloxane, an acrylate polymer and a styrenic polymer; and a shell generally surrounding the core, the shell comprising a polymer attached to the core. The method includes providing a silicone rubber particle; adding a polymerizable styrenic compound into the silicone rubber particle; polymerizing the polymerizable styrenic compound within the particle to provide a styrenic polymer; adding a polymerizable acrylic compound into the silicone rubber particle; polymerizing the polymerizable acrylic compound within the silicone rubber particle to provide an acrylate polymer; and grafting a polymerizable compound onto the silicone rubber particle to provide a shell substantially surrounding the silicone rubber particle comprising the styrenic polymer and the acrylate polymer.
1. An impact modifier for a polymer composition, the impact modifier comprising:
a core comprising a polyorganosiloxane, an acrylate polymer and a styrenic polymer; and
a shell generally surrounding the core, the shell comprising a polymer attached to the core,
wherein said core comprises said polyorganosiloxane and said acrylate polymer in a weight ratio of said polyorganosiloxane to said acrylate polymer of between about 1:6 and about 6:1.
2. The impact modifier of claim 1 , wherein the core further comprises a copolymer comprising an acrylate moiety and a styrenic moiety.
3. The impact modifier of claim 1 , where the core is substantially free of a copolymer comprising an acrylate moiety and a styrenic moiety.
4. The impact modifier of claim 1 , wherein the polyorganosiloxane comprises at least one of a C1-C4 linear or branched alkyl, an aryl and methacryloyloxypropyl.
5. The impact modifier of claim 1 , wherein the polyorganosiloxane is selected from the group consisting of polydimethylsiloxane, polydiphenylsiloxane, polymethylphenylsiloxane, polymethacryloyloxypropylsiloxane and a copolymer of at least two of the foregoing.
6. The impact modifier of claim 1 , wherein the acrylate polymer comprises an alkylacrylate.
7. The impact modifier of claim 1 , wherein the styrenic polymer comprises a polymerizable styrenic compound selected from the group consisting of styrene, α-methylstyrene, and vinyltoluene.
8. The impact modifier of claim 1 , wherein the shell comprises a polymer comprising a substituted or unsubstituted vinyl moiety.
9. The impact modifier of claim 1 , wherein the impact modifier has a refractive index from about 1.49 to about 1.59.
10. A method of making an impact modifier, the method comprising:
providing a polyorganosiloxane particle;
adding a polymerizable styrenic compound into the polyorganosiloxane particle;
polymerizing the polymerizable styrenic compound within the particle to provide a styrenic polymer;
adding a polymerizable acrylic compound into the polyorganosiloxane particle;
polymerizing the polymerizable acrylic compound within the polyorganosiloxane particle to provide an acrylate polymer; and
grafting a polymerizable compound onto the polyorganosiloxane particle to provide a shell substantially surrounding the polyorganosiloxane particle comprising the styrenic polymer and the acrylate polymer,
wherein said polyorganosiloxane particle and said acrylate polymer are present in a weight ratio of said polyorganosiloxane particle to said acrylate polymer of between about 1:6 and about 6:1.
11. The method of claim 10 , wherein the polyorganosiloxane is selected from the group consisting of polydimethylsiloxane, polydiphenylsiloxane, polymethylphenylsiloxane, polymethacryloyloxypropylsiloxane and a copolymer of at least two of the foregoing.
12. The method of claim 10 , wherein the polymerizable styrenic compound is selected from the group consisting of styrene, α-methylstyrene, divinylbenzene and vinyltoluene.
13. The method of claim 10 , wherein the polymerizable acrylic compound comprises an alkylacrylate.
14. The method of claim 10 , wherein the polymerizable compound comprises a monomer or oligomer comprising a substituted or unsubstituted vinyl moiety.
15. The method of claim 10 , further comprising a step of simultaneously polymerizing the polymerizable styrenic compound and the polymerizable acrylic compound within the polyorganosiloxane particle, thereby further providing a copolymer comprising an acrylate moiety and a styrenic moiety.
16. The method of claim 10 , wherein polymerizing the polymerizable styrenic compound and polymerizing the polymerizable acrylic compound are carried out at different times, thereby the resulting impact modifier is substantially free of a copolymer comprising an acrylate moiety and a styrenic moiety.
17. A polymer composition comprising:
a thermoplastic resin; and
the impact modifier of claim 1 .
18. The polymer composition of claim 17 , wherein the thermoplastic resin is selected from the group consisting of a vinyl chloride resin, a styrenic resin, a styrene-acrylonitrile resin, an acrylic resin, a polyester resin, an ABS resin and a polycarbonate resin.
19. The polymer composition of claim 17 , wherein the impact modifier has a refractive index from about 1.49 to about 1.59 before being mixed with the polymer compound.
20. The impact modifier of claim 1 , wherein said polyorganosiloxane comprises polyorganosiloxane particles and wherein said acrylate polymer and said styrenic polymer are formed within the polyorganosiloxane particles.
21. An impact modifier for a polymer composition, the impact modifier comprising:
a core comprising a polyorganosiloxane, an acrylate polymer and a styrenic polymer; and
a shell generally surrounding the core, the shell comprising a polymer attached to the core,
wherein said core comprises said acrylate polymer and said styrenic polymer in a weight ratio of said acrylate polymer to said styrenic polymer of between about 1:20 and about 1:1.
22. The impact modifier of claim 21 , wherein the core further comprises a copolymer comprising an acrylate moiety and a styrenic moiety.
23. The impact modifier of claim 21 , where the core is substantially free of a copolymer comprising an acrylate moiety and a styrenic moiety.
24. The impact modifier of claim 21 , wherein the polyorganosiloxane comprises at least one of a C1-C4 linear or branched alkyl, an aryl and methacryloyloxypropyl.
25. The impact modifier of claim 21 , wherein the polyorganosiloxane is selected from the group consisting of polydimethylsiloxane, polydiphenylsiloxane, polymethylphenylsiloxane, polymethacryloyloxypropylsiloxane and a copolymer of at least two of the foregoing.
26. The impact modifier of claim 21 , wherein the acrylate polymer comprises an alkylacrylate.
27. The impact modifier of claim 21 , wherein the styrenic polymer comprises a polymerizable styrenic compound selected from the group consisting of styrene, α-methylstyrene, and vinyltoluene.
28. The impact modifier of claim 21 , wherein the shell comprises a polymer comprising a substituted or unsubstituted vinyl moiety.
29. The impact modifier of claim 21 , wherein the impact modifier has a refractive index from about 1.49 to about 1.59.
30. A polymer composition comprising:
a thermoplastic resin; and
the impact modifier of claim 21 .
31. A method of making an impact modifier, the method comprising:
providing a polyorganosiloxane particle;
adding a polymerizable styrenic compound into the polyorganosiloxane particle;
polymerizing the polymerizable styrenic compound within the particle to provide a styrenic polymer;
adding a polymerizable acrylic compound into the polyorganosiloxane particle;
polymerizing the polymerizable acrylic compound within the polyorganosiloxane particle to provide an acrylate polymer; and
grafting a polymerizable compound onto the polyorganosiloxane particle to provide a shell substantially surrounding the polyorganosiloxane particle comprising the styrenic polymer and the acrylate polymer,
wherein said acrylate polymer and said styrenic polymer are present in a weight ratio of said acrylate polymer and said styrenic polymer of between about 1:20 and about 1:1.
32. The polymer composition of claim 30 , wherein the thermoplastic resin is selected from the group consisting of a vinyl chloride resin, a styrenic resin, a styrene-acrylonitrile resin, an acrylic resin, a polyester resin, an ABS resin and a polycarbonate resin.
33. The polymer composition of claim 30 , wherein the impact modifier has a refractive index from about 1.49 to about 1.59 before being mixed with the polymer compound.
34. The impact modifier of claim 21 , wherein said polyorganosiloxane comprises polyorganosiloxane particles and wherein said acrylate polymer and said styrenic polymer are formed within the polyorganosiloxane particles.
35. The method of claim 31 , wherein the polyorganosiloxane comprises at least one of a C1-C4 linear or branched alkyl, an aryl, and methacryloyloxypropyl.
36. The method of claim 31 , wherein the polyorganosiloxane is selected from the group consisting of polydimethylsiloxane, polydiphenylsiloxane, polymethylphenylsiloxane, polymethacryloyloxypropylsiloxane and a copolymer of at least two of the foregoing.
37. The method of claim 31 , wherein the polymerizable styrenic compound is selected from the group consisting of styrene, α-methylstyrene, divinylbenzene and vinyltoluene.
38. The method of claim 31 , wherein the polymerizable acrylic compound comprises an alkylacrylate.
39. The method of claim 31 , wherein the polymerizable compound comprises a monomer or oligomer comprising a substituted or unsubstituted vinyl moiety.
40. The method of claim 31 , further comprising a step of simultaneously polymerizing the polymerizable styrenic compound and the polymerizable acrylic compound within the polyorganosiloxane particle, thereby further providing a co-polymer comprising an acrylate moiety and a styrenic moiety.
41. The method of claim 31 , wherein polymerizing the polymerizable styrenic compound and polymerizing the polymerizable acrylic compound are carried out at different times, thereby the resulting impact modifier is substantially free of a copolymer comprising an acrylate moiety and a styrenic moiety.
42. The method of claim 10 , wherein the polyorganosiloxane comprises at least one of a C1-C4 linear or branched alkyl, an aryl, and methacryloyloxypropyl.