Crosslinkable organopolysiloxane compositions

A hydrosilylation-crosslinkable composition, comprising:

• (A) solid organopolysiloxanes consisting of units of formulae
• R2R1SiO1/2 (V),
• R2SiO3/2 (VI)
• and units selected from the group consisting of units of formulae
• R2(OR3)SiO2/2 (VII) and
• R2(OR3)2SiO1/2 (VIII),
• wherein
• R are identical or different and represent hydrocarbon radicals free from aliphatic carbon-carbon multiple bonds,
• R1 are monovalent hydrocarbon radicals having aliphatic carbon-carbon multiple bonds,
• R2 are aromatic hydrocarbon radicals free from aliphatic carbon-carbon multiple bonds, and
• R3 are identical or different and represent hydrogen or alkyl and with the proviso that
• in the organopolysiloxanes (A) the sum of the units of formula (V), based on the sum of all units of formulae (V), (VI), (VII) and (VIII), is 0.15 to 0.24,
• in the organopolysiloxanes (A) the sum of the units of formulae (VII) and (VIII), based on the sum of all units of formulae (V), (VI), (VII) and (VIII), is not more than 0.08,
• organopolysiloxanes (A) contain an average of 10 to 20 silicon atoms,
• organopolysiloxanes (A) have a polydispersity Mw/Mn of 1.05 to 1.40 and a weight-average Mw of 1350 to 1850 g/mol and
• organopolysiloxanes (A) have an average number of radicals R1 per molecule, reported in mol(R1)/mol, of 1.1 to 3.8,
• (B) organosilicon compounds having two Si-bonded hydrogen atoms containing units of formula
• R4eHfR5gSi (IX),
• wherein
• R4 are identical or different and represent monovalent, SiC-bonded, optionally substituted, saturated hydrocarbon radicals,
• R5 are identical or different and represent monovalent or divalent, SiC-bonded, optionally substituted, aliphatically saturated aromatic hydrocarbon radicals,
• e is 0, 1, 2 or 3,
• f is 0, 1 or 2 and
• g is 0, 1 or 2,
• with the proviso that e+f+g=4 and two Si-bonded hydrogen atoms are present per molecule, and
• (C) catalysts which promote addition of Si-bonded hydrogen onto an aliphatic multiple bond.