Organosilicone polymers
AssigneeUnion Carbide Corporation
InventorsBela Prokai, Bernard Kanner
Life of this patent
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Abstract
Linear siloxane-polyoxyalkylene (AB).sub.n block copolymers having an average molecular weight of at least about 30,000, compositions of polyurethane-forming froths containing said copolymers, the curable froths produced from said compositions, methods for utilizing said froths as well as the cured foams and articles produced therefrom, said froths having utility in the production of molded polyurethane foam articles, foam backings for carpeting and fabrics, coatings for wire, cable and other articles, small cavity encapsulations, and the like.
Claims10
A high molecular weight linear non-hydrolyzable siloxane-polyoxyalkylene block copolymer having the average formula
- (--Y(R.sub.2 SiO).sub.a R.sub.2 SiYO[C.sub.n H.sub.2n O).sub.y --).sub.d
- wherein R represents a monovalent hydrocarbon radical free from aliphatic unsaturation;
- n is an integer of from 2 to 4 inclusive;
- a is an integer of at least 6;
- y is an integer of at least 4;
- d is an integer of at least 4;
- Y represents a divalent organic group selected from the class consisting of --R'--, --R'CO-- --R'NHCO--, --R'--NHCONH--R"--NHCO-- and --R'--OOCNH--R"--NHCO-- wherein R' is a divalent alkylene radical and R" is R' or a divalent arylene group;
- wherein the average molecular weight of each siloxane block ranges from about 500 to about 10,000;
- wherein the average molecular weight of each polyoxyalkylene block ranges from about 300 to about 10,000;
- wherein the siloxane blocks constitute about 20 to about 50 weight percent of the copolymer;
- wherein the polyoxyalkylene blocks constitute about 80 to about 50 weight percent of the copolymer;
- and wherein the block copolymer has an average molecular weight of at least about 30,000.
Dependencies are inferred from the claim text.