Cross-linkable masses based on organosilicon compounds

A cross-linkable composition comprising

• (A) one or more organosiloxanes consisting of units of the formulae
• RcSiO4-c/2 (I)
• and
• R5(OR4)mSiO3-m/2 (II),
• where
• R are the same or different monovalent, optionally substituted hydrocarbon radicals,
• R4 are the same or different and are monovalent, optionally substituted hydrocarbon radicals,
• R5 is a group —CH2—NR2R3,
• R2 are hydrogen or monovalent, optionally substituted linear or branched hydrocarbon radicals having 1 to 6 carbon atoms,
• R3 are monovalent, optionally substituted linear or branched hydrocarbon radicals having 1 to 6 carbon atoms or a cyclic saturated hydrocarbon radical having 5 or 6 carbon atoms or a phenyl radical,
• c is 1 or 2 and
• m is 0, 1 or 2,
• with the proviso that at least two R5 radicals and at least four (OR4) groups are present per molecule,
• (B) silanes of the formula
• R5Si(OR4)3 (III)
• and/or partial hydrolysates thereof, and component (B) is present in amounts of 5 to 20 parts by weight, based on 100 parts by weight of component(A),
• (C) organosiloxanes consisting of units of the formula
• R6a(R7O)bSiO(4-a-b)/2 (IV),
• where
• R6 are the same or different and are monovalent, SiC-bonded hydrocarbon radicals optionally substituted by one or more halogen atoms, or an Si-bonded halogen atom,
• R7 are the same or different and are monovalent, optionally substituted hydrocarbon radicals,
• a is 0 or 1 and
• b is 0, 1, 2 or 3,
• with the proviso that, in formula (IV), the sum of a+b is <4, the organosiloxane has 2 to 30 units of the formula (IV) and at least one unit is present per molecule where b is other than 0,
• and component C is present in amounts of 1 to 30 parts by weight, based on 100 parts by weight of component (A),
• (D) organosilicon compounds comprising units of the formula
• DfSi(OR9)eR8dO(4-d-e-f)/2 (V),
• where
• R8 are the same or different and are monovalent, optionally substituted SiC-bonded organic radicals free of nitrogen,
• R9 are the same or different and are hydrogen or optionally substituted hydrocarbon radicals,
• D are the same or different and are monovalent, SiC-bonded radicals having at least one nitrogen atom that is not bonded to a carbonyl group (C═O),
• d is 0 or 1,
• e is 0, 1, 2 or 3, and
• f is 0 or 1,
• with the proviso that the sum of d+e+f is less than or equal to 4, at least one radical D is present per molecule and at least one radical D bears an NH2 group per molecule, and component (D) is present in amounts of 0.1 to 2 parts by weight, based on 100 parts by weight of component (A).