US 4,302,571 AGranted

Room temperature-curable polyoxyalkylene polyether compositions

AssigneeShin-Etsu Chemical Co., Ltd.

InventorsMasatoshi Arai, Koji Futatsumori

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Abstract

A novel room temperature-curable composition is provided by the invention, of which the base polymer is a polyoxyalkylene polyether terminated at both chain ends with silanolic hydroxy groups. The composition comprises 100 parts by weight of the above silanol-terminated polyoxyalkylene polyether and 1 to 30 parts by weight of an organosilane or organopolysiloxane having, in a molecule, at least two hydrolyzable groups bonded to the silicon atoms which serves as a crosslinking agent. The composition can be stored for a long period of time when kept with exclusion of atmospheric moisture and, when exposed to the atmosphere, is rapidly cured into a rubbery elastomer having good mechanical properties. Tack-free drying of the composition is accelerated when an alkenyloxy-containing silane is used as the above-mentioned silane having hydrolyzable groups in combination with a guanidyl-containing organosilicon compound.

Claims15

Dependent claims

A room temperature-curable polyoxyalkylene polyether composition which comprises

(a) 100 parts by weight of a polyoxyalkylene polyether terminated at both chain ends with silyl groups and represented by the general formula ##STR22## where R.sup.1 is a substituted or unsubstituted monovalent hydrocarbon group or a triorganosiloxy group, R.sup.2 is a divalent hydrocarbon group, a is zero, 1, 2 or 3, b is zero, 1 or 2 with the proviso that a+b is a positive integer not exceeding 3, m is zero, 1 or 2 and n is a positive integer, having an average molecular weight in the range from 400 to 15,000, or a partial condensation product thereof, and
(b) from 1 to 30 parts by weight of an organosilane or an organopolysiloxane represented by the formula. ##EQU2## where R.sup.4 is a monovalent hydrocarbon group, Y is a hydrolyzable group, d is zero or a positive number not exceeding 2 and e is a positive number not exceeding 4 with the proviso that d+e is a positive number not exceeding 4, and having at least two hydrolyzable group represented by Y in a molecule.

Dependencies are inferred from the claim text.