Impact-resistant thermoplastic polyorganosiloxane-based graft copolymer and process for producing same
US4690986A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Sep 8, 1986 |
| Grant date | Sep 1, 1987 |
| Priority date | — |
| Expiry date | Sep 8, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D151/085
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A polyorganosiloxane-based high-impact thermoplastic graft copolymer superior in impact resistance, light resistance, surface gloss and color fastness produced by the emulsion graft polymerization of at least one vinyl monomer on an emulsion-polymerized polyorganosiloxane which consists of PA1 90 to 99.8 mole % of an organosiloxane unit represented by the formula EQU R'.sub.2 SiO.sub.2/2 (I) PA1 wherein R' is the same or different and denotes methyl, ethyl, propyl, or phenyl, PA1 0.1 to 10 mole % of a unit derived from a graft-linking agent, said unit being represented by the formula ##STR1## 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 PA1 0.1 to 10 mole % of a unit derived from a tetrafunctional silane crosslinking agent, said unit being represented by the formula EQU SiO.sub.4/2 (III), PA1 said polyorganosiloxane showing a degree of swelling of 5 to 15 in toluene, and PA1 said graft copolymer containing said polyorganosiloxane in an amount of 10 to 70% by weight; and a process for producing the said graft copolymer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.