Crosslinkable compositions comprising organopolysiloxanes containing organyloxy groups and composed of units of the formula R a R 1 b (OR 2) c SiO (4-a-b-c)/2, where R may be identical or different and represents monovalent, SiC-bonded, optionally substituted hydrocarbyl radicals that are free from aliphatic carbon-carbon multiple bonds, R 1 may be identical or different and denotes monovalent, SiC-bonded, optionally substituted hydrocarbyl radicals having aliphatic carbon-carbon multiple bonds, R 2 may be identical or different and denotes monovalent, optionally substituted hydrocarbyl radicals, a is 0, 1, 2 or 3, b is 0 or 1, and c is 0, 1, 2 or 3, with the proviso that in formula the sum a+b+c≤3 and b and c are other than 0 in at least one unit, organosilicon compounds of the formula (R 4 O) d SiR 3 (4-d), where R 3 may be identical or different and denotes monovalent, SiC-bonded, optionally substituted hydrocarbyl radicals, R 4 may be identical or different and denotes hydrogen atom or monovalent, optionally substituted hydrocarbyl radicals, and d is 2, 3 or 4, with the proviso that a radical R 4 having at least two carbon atoms is present in organosilicon compound, and/or their partial hydrolysates and organosilicon compounds containing basic nitrogen and of the formula (R 6 O) e SiR 5 (4-e), where R 5 may be identical or different and denotes monovalent, SiC-bonded radicals containing basic nitrogen, R 6 may be identical or different and denotes hydrogen atom or monovalent, optionally substituted hydrocarbyl radicals, e is 2 or 3, and/or their partial hydrolysates. organopolysiloxanes containing organyloxy groups and composed of units of the formula R a R 1 b (OR 2) c SiO (4-a-b-c)/2, where R may be identical or different and represents monovalent, SiC-bonded, optionally substituted hydrocarbyl radicals that are free from aliphatic carbon-carbon multiple bonds, R 1 may be identical or different and denotes monovalent, SiC-bonded, optionally substituted hydrocarbyl radicals having aliphatic carbon-carbon multiple bonds, R 2 may be identical or different and denotes monovalent, optionally substituted hydrocarbyl radicals, a is 0, 1, 2 or 3, b is 0 or 1, and c is 0, 1, 2 or 3, with the proviso that in formula the sum a+b+c≤3 and b and c are other than 0 in at least one unit, R may be identical or different and represents monovalent, SiC-bonded, optionally substituted hydrocarbyl radicals that are free from aliphatic carbon-carbon multiple bonds, R 1 may be identical or different and denotes monovalent, SiC-bonded, optionally substituted hydrocarbyl radicals having aliphatic carbon-carbon multiple bonds, R 2 may be identical or different and denotes monovalent, optionally substituted hydrocarbyl radicals, a is 0, 1, 2 or 3, b is 0 or 1, and c is 0, 1, 2 or 3, with the proviso that in formula the sum a+b+c≤3 and b and c are other than 0 in at least one unit, organosilicon compounds of the formula (R 4 O) d SiR 3 (4-d), where R 3 may be identical or different and denotes monovalent, SiC-bonded, optionally substituted hydrocarbyl radicals, R 4 may be identical or different and denotes hydrogen atom or monovalent, optionally substituted hydrocarbyl radicals, and d is 2, 3 or 4, with the proviso that a radical R 4 having at least two carbon atoms is present in organosilicon compound, and/or their partial hydrolysates and R 3 may be identical or different and denotes monovalent, SiC-bonded, optionally substituted hydrocarbyl radicals, R 4 may be identical or different and denotes hydrogen atom or monovalent, optionally substituted hydrocarbyl radicals, and d is 2, 3 or 4, with the proviso that a radical R 4 having at least two carbon atoms is present in organosilicon compound, and/or their partial hydrolysates organosilicon compounds containing basic nitrogen and of the formula (R 6 O) e SiR 5 (4-e), where R 5 may be identical or different and denotes monovalent, SiC-bonded radicals containing basic nitrogen, R 6 may be identical or different and denotes hydrogen atom or monovalent, optionally substituted hydrocarbyl radicals, e is 2 or 3, and/or their partial hydrolysates. R 5 may be identical or different and denotes monovalent, SiC-bonded radicals containing basic nitrogen, R 6 may be identical or different and denotes hydrogen atom or monovalent, optionally substituted hydrocarbyl radicals, e is 2 or 3, and/or their partial hydrolysates.