Crosslinkable compositions containing 100 parts by weight of compounds of the formula Y-[(CR 1 2) b -SiR a (OR 2) 3-a] x, where Y represents an x-valent polymeric moiety attached via nitrogen, oxygen, sulfur or carbon, R at each occurrence may be the same or different and represents a monovalent, optionally substituted hydrocarbyl moiety, R 1 at each occurrence may be the same or different and represents a hydrogen atom or a monovalent, optionally substituted hydrocarbyl moiety, which may be attached to the carbon atom via nitrogen, phosphorus, oxygen, sulfur or a carbonyl group, R 2 at each occurrence may be the same or different and represents a hydrogen atom or a monovalent, optionally substituted hydrocarbyl moiety, x is an integer from 1 to 10, a at each occurrence may be the same or different and is 0, 1 or 2, and b at each occurrence may be the same or different and is an integer from 1 to 10, at least 0.2 part by weight of a phenyltrialkoxysilane of the formula C 6 H 5 -Si(OR 3) 3, where R 3 at each occurrence may be the same or different and represents methyl or ethyl, 0.1 to 30 parts by weight of nitrogenous organosilicon compounds containing units of the formula D e Si(OR 5) d R 4 c O (4-e-d-c)/2, where R 4 at each occurrence may be the same or different and represents a monovalent, optionally substituted, SiC-bonded organic moiety free of nitrogen, R 5 at each occurrence may be the same or different and represents a hydrogen atom or an optionally substituted hydrocarbyl moiety, D at each occurrence may be the same or different and represents a monovalent SiC-bonded moiety having at least one nitrogen atom not bonded to the carbonyl group (C=O), c is 0, 1, 2 or 3, d is 1, 2 or 3, and e is 0, 1, 2, 3 or 4, with the proviso that the c+d+e sum is not more than 4 and at least one D moiety is present per molecule, wherein the crosslinkable composition contains less than 0.5 wt% of vinyltrimethoxysilane, based on the total weight of the crosslinkable composition. 100 parts by weight of compounds of the formula Y-[(CR 1 2) b -SiR a (OR 2) 3-a] x, where Y represents an x-valent polymeric moiety attached via nitrogen, oxygen, sulfur or carbon, R at each occurrence may be the same or different and represents a monovalent, optionally substituted hydrocarbyl moiety, R 1 at each occurrence may be the same or different and represents a hydrogen atom or a monovalent, optionally substituted hydrocarbyl moiety, which may be attached to the carbon atom via nitrogen, phosphorus, oxygen, sulfur or a carbonyl group, R 2 at each occurrence may be the same or different and represents a hydrogen atom or a monovalent, optionally substituted hydrocarbyl moiety, x is an integer from 1 to 10, a at each occurrence may be the same or different and is 0, 1 or 2, and b at each occurrence may be the same or different and is an integer from 1 to 10, Y represents an x-valent polymeric moiety attached via nitrogen, oxygen, sulfur or carbon, R at each occurrence may be the same or different and represents a monovalent, optionally substituted hydrocarbyl moiety, R 1 at each occurrence may be the same or different and represents a hydrogen atom or a monovalent, optionally substituted hydrocarbyl moiety, which may be attached to the carbon atom via nitrogen, phosphorus, oxygen, sulfur or a carbonyl group, R 2 at each occurrence may be the same or different and represents a hydrogen atom or a monovalent, optionally substituted hydrocarbyl moiety, x is an integer from 1 to 10, a at each occurrence may be the same or different and is 0, 1 or 2, and b at each occurrence may be the same or different and is an integer from 1 to 10, at least 0.2 part by weight of a phenyltrialkoxysilane of the formula C 6 H 5 -Si(OR 3) 3, where R 3 at each occurrence may be the same or different and represents methyl or ethyl, R 3 at each occurrence may be the same or different and represents methyl or ethyl, 0.1 to 30 parts by weight of nitrogenous organosilicon compounds containing units of the formula D e Si(OR 5) d R 4 c O (4-e-d-c)/2, where R 4 at each occurrence may be the same or different and represents a monovalent, optionally substituted, SiC-bonded organic moiety free of nitrogen, R 5 at each occurrence may be the same or different and represents a hydrogen atom or an optionally substituted hydrocarbyl moiety, D at each occurrence may be the same or different and represents a monovalent SiC-bonded moiety having at least one nitrogen atom not bonded to the carbonyl group (C=O), c is 0, 1, 2 or 3, d is 1, 2 or 3, and e is 0, 1, 2, 3 or 4, with the proviso that the c+d+e sum is not more than 4 and at least one D moiety is present per molecule, wherein the crosslinkable composition contains less than 0.5 wt% of vinyltrimethoxysilane, based on the total weight of the crosslinkable composition. R 4 at each occurrence may be the same or different and represents a monovalent, optionally substituted, SiC-bonded organic moiety free of nitrogen, R 5 at each occurrence may be the same or different and represents a hydrogen atom or an optionally substituted hydrocarbyl moiety, D at each occurrence may be the same or different and represents a monovalent SiC-bonded moiety having at least one nitrogen atom not bonded to the carbonyl group (C=O), c is 0, 1, 2 or 3, d is 1, 2 or 3, and e is 0, 1, 2, 3 or 4,