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US 6,784,241 B2Granted
Room temperature curable organopolysiloxane compositions
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsTakafumi Sakamoto, Tsuneo Kimura
Life of this patent
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Abstract
A room temperature curable organopolysiloxane composition comprising (A) a branched organopolysiloxane having specific radicals on side chains or on side chains and ends of the polymer, (B) fumed silica, (C) an organooxysilane or a partial hydrolytic condensate thereof, and (D) a condensation catalyst is improved in stability during storage under sealed conditions and cures into an elastomeric product whose physical properties change little even when used under rigorous conditions as encountered in proximity to automotive engines.
Claims5
A room temperature curable organopolysiloxane composition comprising
- (A) 100 parts by weight of a branched organopolysiloxane having at least one radical of the general formula (1) or (2) at an end and at least one radical of the general formula (1) or (2) on a side chain of the polymer, or having at least two radicals of the general formula (1) or (2) only on side chains of the polymer,
- (R1O)aR23-aSi—O— (1)
- (R1O)aR23-aSi—Y—SiR22O— (2)
- wherein R1 is a monovalent hydrocarbon group or alkoxy-substituted monovalent hydrocarbon group, R2 is a monovalent hydrocarbon group, “a” is 1 to 3, and Y is a divalent hydrocarbon group having 1 to 8 carbon atoms,
- (B) 1 to 40 parts by weight of fumed silica,
- (C) 0.5 to 25 parts by weight of an organooxysilane having the general formula:
- R3bSi(OR4)4-b wherein R3 is a monovalent hydrocarbon group, R4 is a monovalent hydrocarbon group or alkoxy-substituted monovalent hydrocarbon group, and “b” is 0 or 1, or a partial hydrolytic condensate thereof, and
- (D) 0.1 to 10 parts by weight of a condensation catalyst.
5 more elements
Dependencies are inferred from the claim text.