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US 4,939,206 AGranted
Flame retardant polyorganosiloxane-based graft polymers
AssigneeGeneral Electric Company
InventorI-Chung W. Wang
Life of this patent
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Abstract
Thermoplastic resin compositions are blended with a novel silicone-based flame retardant which also imparts good impact resistance and low temperature ductility on the thermoplastic resins. Polyorganosiloxanes are grafted with vinyl-based polymers, such as bromostyrenes, capable of exhibiting flame retarding properties and then blended with normally flammable thermoplastic resins.
Claims44
A flame retardant multi-stage polyorganosiloxane-based qraft polymer composition comprising:
- (a) as a first stage, a substrate selected from
- (i) an organosiloxane polymer with units derived from a cross-linking agent or agents, and optionally units which serve as a graft linking agent or agents;
- (ii) a polymeric co-homopolymerized substrate comprised of, in combination, an organo-siloxane polymer and at least one vinyl-based polymer;
- (iii) 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;
- (iv) 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;
- (v) 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;
- (vi) 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;
- or
- (vii) a mixture of (i), and at least one of (ii), (iii), (iv), (v) or (vi);
- and a functionally effective amount of
- (b) at least one subsequent stage or stages graft polymerized in the pr previous stages, the outermost stage being comprised of a vinyl-based polymer, or a cross-linked vinyl-based polymer, capable of exhibiting flame retardant properties.
8 more elements
A composition comprising
- (A) A normally-flammable thermoplastic resin, and
- (B) an effective flame retarding amount of a multi-stage polyorganosiloxane-based graft polymer composition comprising:
- (a) as a first stage, a substrate selected from
- (i) an organosiloxane polymer with units derived from a cross-linking agent or agents and optionally units which serve as a graft-linking agent or agents;
- (ii) a polymeric co-homopolymerized substrate comprised of, in combination, an organosiloxane polymer and at least one vinyl-based polymer;
- (iii) 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 agent;
- (iv) 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;
- (v) 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;
- (vi) 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;
- or
- (vii) a mixture of and at least one of (ii), (iii), (iv), (v) or (vi);
- and a functionally effective amount of
- (b) at least one subsequent stage or stages graft polymerized in the presence of any previous stages, the outermost stage being comprised of a vinyl-based polymer, or a cross-linked vinyl-based polymer, capable of exhibiting flame retardant properties.
10 more elements
Dependencies are inferred from the claim text.