Claims
- 1. An impact-resistant, thermoplastic polyorganosiloxane-based graft copolymer produced by the emulsion graft polymerization of at least one vinyl monomer on an emulsion-polymerized polyorganosiloxane which consists of
- 90 to 99.8 mole % of an organosiloxane unit represented by the formula
- R'.sub.2 SiO.sub.2/2 (I)
- wherein R' is the same or different and denotes methyl, ethyl, propyl, or phenyl,
- 0.1 to 10 mole % of a unit derived from a graft-linking agent, said unit being represented by the formula ##STR4## wherein; R.sup.2 denotes methyl, ethyl, propyl, or phenyl; n denotes a number of 0, 1, and 2; and p denotes a number of 1 to 6, and
- 0. 1 to 10 mole % of a unit derived from a tetrafunctional silane crosslinking agent, said unit being represented by the formula
- SiO.sub.4/2 (III),
- said polyorganosiloxane showing a degree of swelling of 5 to 15 in toluene, and
- said graft copolymer containing said polyorganosiloxane in an amount of 10 to 70% by weight.
- 2. The impact-resistant, thermoplastic polyorganosiloxane-based graft copolymer of claim 1, wherein the unit derived from a graft-linking agent is represented by the formula ##STR5## wherein, p is a number of 2 to 4 and R.sup.2 and n are as defined in claim 1.
- 3. The impact-resistant, thermoplastic polyorganosiloxane-based graft copolymer of claim 1, wherein the unit derived from a graft-linking agent is represented by the formula ##STR6## wherein, p is 3 and R.sup.2 and n are as defined in claim 1.
- 4. The impact-resistant, thermoplastic polyorganosiloxane-based graft copolymer of claim 1, wherein the unit represented by the formula (III) is derived from tetramethoxysilane or tetraethoxysilane.
- 5. The impact-resistant, thermoplastic polyorganosiloxane-based graft copolymer of claim 1, wherein the unit represented by the formula (III) is derived from tetraethoxysilane.
- 6. The impact-resistant, thermoplastic polyorganosiloxane-based graft copolymer of claim 1 which contains the polyorganosiloxane in an amount of 20 to 60% by weight
- 7. The impact-resistant, thermoplastic polyorganosiloxane-based graft copolymer of claim 1, wherein the vinyl monomer is at least one member selected from the group consisting of aromatic alkenyl compounds and vinyl cyanide compounds.
- 8. The impact-resistant, thermoplastic polyorganosiloxane-based graft copolymer of claim 1, wherein the particle diameters of the polyorganosiloxane are from 0.05 to 1 .mu.m.
- 9. The impact-resistant, thermoplastic polyorganosiloxane-based graft copolymer of claim 1, wherein the particle diameters of the polyorganosiloxane are from 0.08 to 0.5 .mu.m.
- 10. A process for producing an impact-resistant, thermoplastic polyorganosiloxane-based graft copolymer, which comprises the steps of
- (A) emulsion copolymerization of
- (i) an organosiloxane compound capable of forming an organosiloxane unit represented by the formula
- R'.sub.2 SiO.sub.2/2 (I)
- wherein R' is the same or different and denotes methyl, ethyl, propyl, or phenyl,
- (ii) a graft-linking agent capable of forming a unit represented by the formula ##STR7## wherein, R.sup.2 denotes methyl, ethyl, propyl or phenyl; n denotes a number of 0, 1, and 2; and p denotes a number of 1 to 6, and
- (iii) a tetrafunctional silane crosslinking agent capable of forming a unit represented by the formula
- SiO.sub.4/2 (III)
- to prepare a polyorganosiloxane which consists of 90 to 99.8 mole % of the unit of the formula (I), 0.1 to 10 mole % of the unit of the formula (II), and 0.1 to 10 mole % of the unit of the formula (III) and shows a degree of swelling of 5 to 15 in toluene, and
- (B) emulsion graft polymerization of at least one vinyl monomer on said polyorganosiloxane to produce the intended graft copolymer containing said polyorganosiloxane in an amount of 10 to 70% by weight.
- 11. The process for producing an impact-resistant, thermoplastic polyorganosiloxane-based graft copolymer according to claim 10 wherein the graft-linking agent is capable of forming a unit represented by the formula ##STR8## wherein, p is a number of 2 to 4 and R.sup.2 and n are as defined in claim 10.
- 12. The process for producing an impact-resistant, thermoplastic polyorganosiloxane-based graft copolymer according to claim 10, wherein the graft-linking agent is capable of forming a unit represented by the formula ##STR9## wherein, p is 3 and R.sup.2 and n are as defined in claim 10.
- 13. The process for producing an impact-resistant, thermoplastic polyorganosiloxane-based graft copolymer according to claim 10, wherein the tetrafunctional silane crosslinking agent is tetramethoxysilane or tetraethoxysilane.
- 14. The process for producing an impact-resistant, thermoplastic polyorganosiloxane-based graft copolymer according to claim 10, wherein the tetrafunctional silane crosslinking agent is tetraethoxysilane.
- 15. The process for producing an impact-resistant, thermoplastic polyorganosiloxane-based graft copolymer according to claim 10, wherein the polyorganosiloxane content in the graft copolymer is controlled to 20 to 60% by weight.
- 16. The process for producing an impact-resistant, thermoplastic polyorganosiloxane-based graft copolymer according to claim 10, wherein the vinyl monomer is at least one member selected from the group consisting of aromatic alkenyl compounds and vinyl cyanide compounds.
- 17. The process for producing an impact-resistant, thermoplastic polyorganosiloxane-based graft copolymer according to claim 10, wherein the particle diameters of the polyorganosiloxane are from 0.05 to 1 .mu.m.
- 18. The process for producing an impact-resistant, thermoplastic polyorganosiloxane-based graft copolymer according to claim 10, wherein the particle diameters of the polyorganosiloxane are from 0.08 to 0.5 .mu.m.
Priority Claims (1)
Number |
Date |
Country |
Kind |
59-108492 |
May 1984 |
JPX |
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Parent Case Info
This application is a continuation-in-part application of Ser. No. 726,462 filed Apr. 24, 1985, now abandoned.
US Referenced Citations (7)
Foreign Referenced Citations (2)
Number |
Date |
Country |
8000253 |
Feb 1980 |
WOX |
2093471 |
Sep 1982 |
GBX |
Non-Patent Literature Citations (1)
Entry |
Chem Abstracts, vol. 100 (1984), No. 8, Columbus, Ohio, USA, pp. 35 and 36. |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
726462 |
Apr 1985 |
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