Patent ID: 6951912

Claim:
In a composition which is crosslinkable with elimination of alcohols from alkoxysilyl end groups to give elastomers in the presence of a catalyst, the improvement comprising selecting as at least one catalyst, a tin compound having a coordination number of 5 or 6 and coordinately bonded to a P═O group of a phosphorus compound, the tin compound prepared by reaction of a phosphorus compound having a P═O group, of the formulae (I), (III): O═PR 1 m (OR 2 ) n (OH) 3-m-n (I), where n is 3, where m is 0, n is 0, 1, or 2, where m is 1, 2, or 3, m+n is 1, 2, or 3, R 1 and R 2 are C 1 -C 30 -hydrocarbon radicals, optionally substituted by hydroxy, halogen, or cyano radicals, or radicals of the general formula (II): —[(CR 3 2 ) b —O] c (CR 4 2 ) d -L-M (II), where R 3 and R 4 are independently selected from hydrogen radicals, methyl radicals, and hydroxy radicals, b and d are 2 or 3, c is an integer from 1 to 15, L each independently is a radical selected from the group consisting of —O—, —COO—, —OOC—, —CONR 5 —, —NR 6 CO—, and —CO—, R 5 and R 6 each independently are a hydrogen radical or a C 1 -C 10 -alkyl radical, and M is a monovalent C 1 -C 20 -hydrocarbon radical, optionally substituted with hydroxy, fluoro, chloro, bromo, C 10 -C 10 -alkoxyalkyl, or cyano groups, with the proviso that on each carbon atom only one of the radicals R 3 and R 4 may be a hydroxyl radical; O═PR 7 o (NR 8 2 ) p (OR 9 ) 3-o-p (III), where R 7 is as defined for R 1 , R 8 is as defined for R 1 , and where it is possible for the radicals R 8 to be bonded to one another, R 9 is as defined for R 1 , or is hydrogen, o is 0, 1, or 2, p is 1, 2, or 3, and o+p is 1, 2, or 3, or condensates or hydrolysates of compounds of the formulae (I), (III) having one or more P—O—P bonds; with an organic tin compound of formula (IV): R 10 4-r SnX r (IV), an organic tin compound of the formula (V): R 10 2 SnY (V), an organic tin compound of the formula (VI): R 10 3 SnY 1/2 (VI), an organic tin compound of the formula (VII): R 10 SnY 3/2 (VII), where R 10 is C 1 -C 20 -hydrocarbon radicals, optionally substituted by halogen radicals or by cyano radicals, X is halo, —OH, —OR 10 , —SR 10 , —OOCR 10 , —NR 10 2 , —NHR 10 , —OSiR 10 3 or —OSi(OR 10 ) 3 , Y is O or S, and r is the values 1, 2, or 3.