Patent ID: 11970580
Assignee: SHIN-ETSU CHEMICAL CO., LTD.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A room-temperature-curable organopolysiloxane composition for an oil seal, comprising:
(A) 100 parts by weight of a diorganopolysiloxane having one hydroxyl group and/or one hydrolyzable sily group bonded to a silicon atom at both ends of the molecular chain and having a viscosity at 23° C. of 20 to 1,000,000 mPa s;
(B) 1 to 500 parts by weight of an inorganic filler;
(C) 0.1 to 40 parts by weight of a hydrolyzable organosilane compound and/or a partial hydrolytic condensate thereof, the hydrolyzable organosilane compound having the general formula (1) below:, , wherein R1 is each independently an unsubstituted or substituted monovalent hydrocarbon group having 1 to 12 carbon atoms, R2 is an unsubstituted or substituted monovalent hydrocarbon group having 1 to 12 carbon atoms, Y is a hydrolyzable group, and n is 0, 1, or 2;
(D) 0.01 to 5 parts by weight of a silane coupling agent and/or a partial hydrolytic condensate thereof, the silane coupling agent having the general formula (2) below:

R3R4aSiX3-a  (2), wherein R3 is a monovalent hydrocarbon group having 1 to 20 carbon atoms and having at least one functional group containing any one or more atoms selected from a nitrogen atom, a sulfur atom, an oxygen atom, R4 is an unsubstituted or substituted monovalent hydrocarbon group having 1 to 10 carbon atoms, X is a hydrolyzable group, and a is 0, 1, or 2; and
(E) 0.1 to 5 parts by weight of a curing catalyst consisting of one, or two or more selected from a non-silicon-based organic compound, a hydrolyzable organosilane compound, and a partial hydrolytic condensate thereof, other than the components (C) and (D), having at least one guanidine skeleton in one molecule, the guanidine skeleton having the general formula (3) below:, wherein R5 is each independently a hydrogen atom, an unsubstituted or substituted monovalent hydrocarbon group having 1 to 20 carbon atoms, a methylol group, or a cyano group,
and wherein the room-temperature-curable composition is free of a metal-based catalyst and is a dealcoholization type.