Rapidly curable, storage-stable organosilicon compositions

Claim 1

An organosilicon composition which is storage-stable in the absence of water and curable into elastomers under ambient conditions, and which comprises: (a) 100 parts by weight of at least one α,ω-di(hydroxy) diorganopolysiloxane polymer [A] having a viscosity of at least 600 cps at 25° C and essentially consisting of diorganosiloxy units of the formula R 2 SiO wherein each substituent R is the same or different and represents an alkyl or halogenoalkyl group containing 1 to 8 carbon atoms, a cycloalkyl or halogenocycloalkyl group containing 3 to 8 carbon atoms, an alkenyl group containing 2 to 4 carbon atoms, an aryl or halogenoaryl group containing 6 to 8 carbon atoms or a cyanoalkyl group containing 3 to 4 carbon atoms, and wherein at least 50% of all the substituents R represent methyl; (b) 15 to 50 parts by weight of at least one organosilicon resin [B] essentially consisting of units of the formulae SiO 2 and R' 3 SiO 0 .5, wherein each substituent R' is the same or different and represents an alkyl or halogenoalkyl group containing 1 to 3 carbon atoms, a vinyl group or a phenyl group, and wherein the molar ratio between the R' 3 SiO 0 .5 units and the SiO 2 units is from 0.4:1 to 1.2:1; (c) 2 to 25 parts by weight of at least one alkoxylated organosilicon compound [C] which is selected from the group consisting of: monomers [F] of formula (C 1 ), R x Si[(OCH 2 CH 2 ) a OR"] 4-x , wherein R is as defined above for the α,ω-di(hydroxy) diorganosiloxane polymers [A], R" represents an alkyl group containing 1 to 4 carbon atoms, "a" represents zero or 1, and "x" represents zero, 1 or 2; polymers [G] obtained by partial hydrolysis of monomers of formula Si(OR") 4 , wherein R" is as defined above for the compounds [F], with the proviso that, when employing those difunctional monomers of the formula [F] wherein x is 2, the same are necessarily admixed with either other monomers of the formula [F] wherein x is either 0 or 1, and/or with the aforesaid polymers resulting from partial hydrolysis of the Si(OR") 4 monomers, and with the further proviso that such admixtures comprise at most 40% of difunctional monomers; and (d) 0.5 to 18 parts by weight of at least one organic titanium derivative [D] which is selected from the group consisting of: monomers [H] of the formula Ti[OCH 2 CH 2 ) b OR'''] 4 , wherein b represents zero, 1 or 2, and R''' represents an alkyl group which contains 2 to 12 carbon atoms if b equals zero and which contains 1 to 4 carbon atoms if b equals 1 or 2, polymers [I] obtained by partial hydrolysis of monomers of the formula Ti(OR''') 4 , wherein R''' represents an alkyl group containing 2 to 12 carbon atoms, and titanium chelates [J] which are selected from the group of compounds of formula (D 1 ) ##STR16## wherein R''' represents an alkyl group containing 2 to 12 carbon atoms and y is 2 or 3, Q represents hydrogen, an alkyl group containing 1 to 4 carbon atoms, a phenyl group, an alkoxy group containing 1 to 5 carbon atoms or a dialkylamino group, the alkyl groups of which each contain 1 to 3 carbon atoms, R 3 represents hydrogen, methyl, chloromethyl or acetyl, Q' represents an alkyl group containing 1 to 5 carbon atoms or chloromethyl, or wherein Q is hydrogen or an alkoxy group containing 1 to 5 carbon atoms, R 3 and Q' together with the carbon atoms from which they depend can be linked to form a phenyl nucleus, and compounds of formula (D 2 ) ##STR17## wherein R 4 and R 5 each are the same or different and each represents hydrogen or methyl, n represents zero, 1 or 2, and Q, Q' and R 3 are as defined above for formula (D 1 ).