| abstract |
Room temperature curing polyorganosiloxane compositions comprising: (A) 100 parts by weight of a composition containing (1) a polyorganosiloxane R1a(R2O)3-aSiO[R2SiO]nSi(OR2)3-aR1a wherein R represents a substituted or unsubstituted monovalent hydrocarbon group; which the viscosity of (A) at 25 DEG C. may be 100 to 500,000 cP, which is reactive at the terminal groups and (2) a silane of the formula: R3bSi(OR4)4-b wherein R represents substituted or unsubstituted monovalent hydrocarbon groups; b is a numeral of 0 or 1, or a hydrolyzate thereof, wherein (A)(1) is 85 to 100% by weight of the total of (A)(1) and (A)(2); (B) 0.01 to 10 parts by weight of a curing catalyst; (C) 0.5 to 10 parts by weight of a nitrogen containing silicon compound, wherein a nitrogen atom is bonded to a silicon atom via one or more carbon atoms and the nitrogen atom is also bonded directly to the same silicon atom or another silicon atom; and (D) 0.05 to 50 parts by weight of a polyorganosiloxane expressed by the formula: <IMAGE> wherein R5 may be the same or different and each represents a monovalent group selected from the group consisting of a hydrogen atom, and substituted or unsubstituted hydrocarbon groups; R6 represents a divalent hydrocarbon group; R7 and R8 may be the same or different and each represents a substituted or unsubstituted monovalent hydrocarbon group; the viscosity of (D) at 25 DEG C. may be 5 to 10,000 cP and p/(p+q) is 0.33 or less, which may also contain amounts of residual hydroxyl groups or alkoxy groups bonded to silicon atoms. |