1,154,853. Curable silicon-containing polyesters and polyglycols. GENERAL ELECTRIC CO. 20 July, 1966 [26 Aug., 1965], No. 32628/66. Headings C3R and C3T. Room temperature curable materials comprise a polyester or a polyglycol having terminal organosilyl groups consisting of (A) at least one monovalent silyl radical joined by C-Si linkages to (B) an intermediate polyvalent organo radical which is directly attached to said organic polymer in the terminal position by an ether, ester, urethane or a carbonate linkage, where (A) has the formula V is halogen, alkoxy and R radicals which are selected from monovalent hydrocarbon and halogenated hydrocarbon radicals, G is selected from OY radicals and monovalent organosilicon radicals having at least one OY radical attached to Si by a Si-O linkage and comprising at least one chemically combined R 2 SiO unit, Y is a monovalent amine radical selected from -NRSP1/SP 2 and a heterocyclic amine and derived from a hydroxyl amine, RSP1/SP is an alkyl radical, and the intermediate polyvalent organo radical (B) is selected from and where Q is selected from QSP1/SP and divalent cycloalkane radicals having from 3 to 10 carbons, D is selected from -O- and QSP1/SP is CRSP111/SP 2 CRSP11/SP(H), RSP11/SP is hydrogen or alkyl, K is RSP111/SP or a divalent ether radical having the characteristic group RSP111/SPORSP111/SP, RSP111/SP is a divalent hydrocarbon or a halogenated divalent hydrocarbon radical, Z is -O- -S-, or -NRSP11/SP-, W is a polyvalent hydrocarbon radical having a valence of at least 2, a is 0, 1 or 2, b is 0 or 1 and c is one less than the valence of W. Suitable starting polyesters and polyglycols have terminal hydroxy radicals and may be derived respectively, by reaction between a polycarboxylic acid and a polyglycol, and from source materials such as ethylene and propylene oxides, epichlorohydrin and tetrahydrofuran. Organic polymers having terminal hydroxy radicals, or a mixture of hydroxy and carboxy radicals consisting of blocks of polyglycol, polyester or mixtures thereof joined by urethane linkages may also be used. The silyl radicals (A) may be derived from silicon hydrides of the formula wherein X is hydrogen, halogen, alkoxy or a monovalent organosilicon radical comprising at least one SiR 2 O unit. The curable materials may contain accelerators such as stannous octoate, dibutyltindilaurate and stannous oleate. Fillers include carbon black, diatomaceous earth and fumed silica and reinforcing materials such as silicon carbide fibres and glass fibres can be used. Other additives include pigments, heat stabilizers and plasticizers. Uses: sealing and caulking applications, in roof construction and as an encapsulating and potting compound.
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