Polyesters modified with polyorganosiloxane/polyvinyl-based graft polymers
AssigneeGeneral Electric Company
InventorsJames L. Derudder, I-Chung W. Wang
Life of this patent
Estimating the term…
Abstract
Thermoplastic molding compositions are provided which comprise a polyester resin alone or in combination with a poly(etherester) elastomer, a poly(etherimide ester) elastomer, or a mixture of the foregoing modified with a multi-stage polyorganosiloxane/polyvinyl-based graft polymer which exhibit materially enhanced impact strength, particularly at low temperatures, while maintaining other desirable properties without showing any tendency to delaminate. Particularly noteworthy are reductions in surface gloss and the substantially complete elimination of mottling.
Claims36
A composition comprising a thermoplastic polyester resin (A);
- a mixture (A-1) comprising (i) a thermoplastic polyester resin and (ii) a poly(etherester) elastomer, a poly(etherimide ester) elastomer, or a mixture of the foregoing elastomers;
- or a mixture (A-2) of (A) and (A-1);
- and
- an effective impact strength 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 organosioxane 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 agents 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.
Dependencies are inferred from the claim text.