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US 5,045,595 AGranted
Polyorganosiloxane/polyvinyl-based graft polymers, process and thermoplastic compositions containing the same
AssigneeGeneral Electric Company
InventorI-Chung W. Wang
Life of this patent
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Abstract
A multi-stage polyorganosiloxane/polyvinyl-based graft polymer is provided by the co-homopolymerization of a silicone polymer and a polyvinyl polymer (e.g. polystyrene) and the subsequent graft polymerization of one or more stages of additional vinyl-type polymers. When the isolated multi-stage graft polymers are combined with thermoplastic resins and are molded, impact strength, weld line strength and thermal stability are markedly improved with no tendency to delaminate.
Claims64
A multi-stage polyorganosiloxane/polyvinyl-based graft polymer composition comprising:
- (a) as a first stage, a substrate selected from
- (i) a polymeric co-homopolymerized substrate comprised of, in combination, an organosiloxane polymer and at least one vinyl-based polymer;
- (ii) a polymeric co-homopolymerized substrate comprised of, in combination, an organosiloxane polymer, at least one vinyl-based polymer, and units which are derived from a cross-linking agent or agents;
- (iii) a polymeric co-homopolymerized substrate comprised of, in combination, an organosiloxane polymer, at least one vinyl-based polymer, and units which serve as a graft-linking agent or agents;
- (iv) a polymeric co-homopolymerized substrate comprised of, in combination, an organosiloxane polymer, at least one vinyl-based polymer, units which are derived from a cross-linking agent or agents and units from the same or different agent or agents which serve as a graft-linking agent or agents;
- or
- (v) a polymeric co-homopolymerized substrate comprised of, in combination, an organosiloxane polymer, at least one vinyl-based polymer, and a mixture of any of units which are derived from a cross-linking agent or agents, units which serve as a graft-linking agent or agents, or units derived from a cross-linking agent or agents and units from the same or different agent or agents which serve as a graft-linking agent or agents;
- and
- (b) at least one subsequent stage or stages graft polymerized in the presence of any previous stages and which is comprised of a vinyl-based polymer or a cross-linked vinyl-based polymer.
6 more elements
A process for producing a multi-stage polyorganosiloxane/polyvinyl-based graft polymer comprising the steps of:
- (i) providing a first stage substrate by the concurrent co-homopolymerization of
- (1) an organosiloxane and one or more vinyl-based monomers;
- (2) an organosiloxane, one or more vinyl-based monomers, and units which are derived from a cross-linking agent or agents;
- (3) an organosiloxane, one or more vinyl-based monomers, and units which serve as a graft-linking agent or agents;
- (4) an organosiloxane, one or more vinyl-based monomers, units which are derived from at least one cross-linking agent or agents and units of the same or different agent or agents which serve as a graft-linking agent or agents;
- or
- (5) an organosiloxane, one or more vinyl-based monomers, and a mixture of any of units which are derived from a cross-linking agent or agents, units which serve as a graft-linking agent or agents, or units derived from a cross-linking agent or agents and units from the same or different agent or agents which serve as a graft-linking agent or agents;
- (ii) neutralizing the reaction mass of the foregoing polymerization step to a pH of at least about 6.5 to provide a neutralized polyorganosiloxane/polyvinyl-based substrate latex;
- (iii) graft polymerizing at least one vinyl-based monomer in a subsequent stage in the presence of said polyorganosiloxane/polyvinyl-based substrate thereby providing said multi-stage polyorganosiloxane/polyvinyl-based graft polymer.
6 more elements
A composition comprising
- (A) A thermoplastic resin,
- and an effective modifying amount of a multi-stage polyorganosiloxane/polyvinyl-based graft polymer composition (B) comprising:
- (a) as a first stage, a substrate selected from
- (i) a polymeric co-homopolymerized substrate comprised of, in combination, an organosiloxane polymer and at least one vinyl-based polymer;
- (ii) a polymeric co-homopolymerized substrate comprised of, in combination, an organosiloxane polymer, at least one vinyl-based polymer, and units which are derived from a cross-linking agent or agents;
- (iii) a polymeric co-homopolymerized substrate comprised of, in combination, an organosiloxane polymer, at least one vinyl-based polymer, and units which serve as a graft-linking agent or agents;
- (iv) a polymeric co-homopolymerized substrate comprised of, in combination, an organosiloxane polymer, at least one vinyl-based polymer, units which are derived from a cross-linking agent or agents and units from the same or different agent or agents which serve as a graft-linking agent or agents;
- or
- (v) a polymeric co-homopolymerized substrate comprised of, in combination, an organosiloxane polymer, at least one vinyl-based polymer, and a mixture of any of units which are derived from a cross-linking agent or agents, units which serve as a graft-linking agent or agents, or units derived from a cross-linking agent or agents and units from the same or different agent or agents which serve as a graft-linking agent or agents;
- and
- (b) at least one subsequent stage or stages graft polymerized in the presence any previous stages and which is comprised of a vinyl-based polymer or a cross-linked vinyl-based polymer.
8 more elements
Dependencies are inferred from the claim text.