US 4,690,986 A · Impact-resistant thermoplastic polyorganosiloxane-based graft copolymer and process for producing same

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 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 ##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 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; and a process for producing the said graft copolymer.

Claims18

Dependent claims

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.

8 more elements

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.

8 more elements

Dependencies are inferred from the claim text.

Impact-resistant thermoplastic polyorganosiloxane-based graft copolymer and process for producing same

Life of this patent

Impact-resistant thermoplastic polyorganosiloxane-based graft copolymer and process for producing same

Life of this patent

Abstract

Claims18