Patent ID: 9688819
Date: 2017-06-27
CPC Classifications: C08G,C09D,H01L

Claim:
1. An addition-crosslinking silicone resin composition comprising A) at least one branched, self-crosslinking organopolysiloxane of the formula (I) where R 1 to R 6 are mutually independently monovalent, optionally substituted hydrocarbon moieties which are optionally interrupted by heteroatoms, or are an OH group, or a hydrogen atom, M, D, T, and Q are a number from 0 to <1, with the proviso that M+D+T+Q=1 and Q+T>0, and with the proviso that a molecule A) comprises, as moieties R 1 to R 6 , at least two alkenyl groups, at least two hydrogen atoms, and at least one aryl group, and with the provisos that at least 5 mol % of all of the subunits of A) are of the form (R 4 R 5 SiO 2/2 ) D , at least 6 mol % of all of the subunits (R 4 R 5 SiO 2/2 ) D are present as chain segments made of from 3 to 200 adjacent subunits in A), and the moieties R 4 and R 5 of said subunits present as chain segments are neither a hydrogen atom nor an alkenyl moiety, where the molar ratio of the silicon-bonded repeating units bearing alkenyl groups to the repeating units bearing silicon-bonded hydrogen atoms is at least 0.75; and where the molar proportion of the silicon atoms bearing at least one aryl moiety to the total number of the silicon atoms is at least 30%; and where the molar proportion of the alkyl groups, based on the total number of the silicon-bonded moieties is at most 70%, C) an effective catalyzing amount of at least one catalyst that promotes the addition reaction of Si-bonded hydrogen onto aliphatic double bonds, where the molar ratio of silicon-bonded alkenyl groups to silicon-bonded hydrogen atoms in the addition-crosslinking silicone resin composition is from at least 0.75:1 to 2:1, and further comprising at least one flexipolymer D) of the formula (IV) where R 11 and R 12 and R 13 are mutually independently optionally substituted hydrocarbon moieties which are optionally interrupted by heteroatoms, and are not a hydrogen atom; w and x* are respectively a number 0, 1, 2, or 3, where w+x*=3; y and z are respectively a number 0, 1, 2, or 3, where y+z=2; M*, D*, and T* are a number from 0 to <1, where M*+D*+T*=1, with the proviso that, per molecule D), there are at least two alkenyl groups present as R 11 , and there is at least one aryl group present as R 12 or R 13 .