| 主权项 |
1. A curable resin composition, comprising:
(A1) a silicone resin component comprising at least one organopolysiloxane resin consisting of units of the formula
Ra(OH)b(R1O)cSiO(4-a-b-c)/2 (I), wherein R each are identical or different, and denote a monovalent, SiC-bonded hydrocarbon radical optionally substituted by halogen, or denote a Si-bonded halogen atom, R1 each are identical or different and denote a monovalent, optionally substituted hydrocarbon radical, a is 0, 1, 2 or 3, b is 0, 1, 2 or 3 and c is 0, 1, 2 or 3, with the provisos that:
in formula (I) the sum a+b+c≦3,in the resin component (A1) b≧1 in at least 2% of all the units of formula (I),in the resin component (A1) c≧1 in not more than 10% of all the units of formula (I),in the resin component (A1) a=2 in at most 50% of the units of formula (I), andthe resin component (A1) has a mean molecular weight Mw (weight average) of from 500 g/mol to 11,000 g/mol and a mean molecular weight Mn (number average) of from 500 g/mol to 5000 g/mol, and the polydispersity (Mw/Mn) of the resin component (A1) is from 1 to 5, (A2) an organosilicon component consisting of at least one organosilicon compound consisting of units of the formula
R2d(OH)e(R3O)fSiO(4-d-e-f)/2 (II), wherein R2 each are identical or different and denote a monovalent, SiC-bonded hydrocarbon radical optionally substituted by halogen, or denote a Si-bonded halogen atom, R3 each are identical or different and denote a monovalent, optionally substituted hydrocarbon radical, d is 0, 1 or 2, e is 0, 1, 2 or 3 and f is 0, 1, 2 or 3, with the provisos that:
in formula (II) the sum d+e+f≦4,in the organosilicon component (A2) f≧1 in at least 10% of all the units of formula (II),in the organosilicon component (A2) e≧1 in not more than 2% of all the units of formula (II), andin the organosilicon component (A2), in at most 50% of the units of formula (II) with d+e+f≦3, d=2, and (B) at least one filler. |
