Curable organopolysiloxane composition and semiconductor device
AssigneeDow Corning Toray Co., Ltd.
InventorsTomoko Kato, Yoshitsugu Morita, Shinichi Yamamoto, Toshio Saruyama
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Abstract
A curable organopolysiloxane composition comprising at least the following components: (A) a linear diorganopolysiloxane with a mass average molecular weight of at least 3,000, (B) a branched organopolysiloxane, (C) an organopolysiloxane having, on average, at least two silicon-bonded aryl groups and, on average, at least two silicon-bonded hydrogen atoms in one molecule, and (D) a hydrosilylation reaction catalyst; has excellent curability and, when cured, forms a flexible cured product of high refractive index, optical transmissivity, excellent adherence to various substrates, high hardness and slight surface tack.
Claims14
A curable organopolysiloxane composition comprising at least the following components:
- (A) a component selected from the group consisting of the following items (i) through (iii):
- (i) a linear diorganopolysiloxane (A1) with a mass average molecular weight of at least 3,000 represented by the general formula:
- R12R2SiO(R12SiO)m(R1R2SiO)nSiR12R2
- (where R1 is a substituted or unsubstituted monovalent hydrocarbon group that does not have aliphatic unsaturated bonds, with at least one R1 in one molecule being an aryl group, R2 is an alkenyl group, “m” is a positive integer, and “n” is a positive integer),
- (ii) a mixture of the above-mentioned component (A1) and a linear diorganopolysiloxane (A2) with a mass average molecular weight of less than 3,000 represented by the general formula:
- R12R2SiO(R12SiO)m′,(R1R2SiO)n′SiR12R2
- (where R1 is the same as above, with at least one R1 in one molecule being an aryl group, R2 is the same as above, “m′” is a positive integer, and “n′ ” is a positive integer), and
- (iii) a mixture of the above-mentioned component (A1) and a linear diorganopolysiloxane (A3) represented by the general formula:
- R12R2SiO(R12SiO)m′SiR12R2
- (where R1 is the same as above, with at least one R1 in one molecule being an aryl group, R2 is the same as above, and “m″” is a positive integer);
- (B) a branched organopolysiloxane represented by the average unit formula:
- (R3SiO3/2)a(R32SiO2/2)b(R33SiO1/2)c(SiO4/2)d(XO1/2)e
- (where R3 is a substituted or unsubstituted monovalent hydrocarbon group, with at least one R3 in one molecule being an alkenyl group and at least one R3 being an aryl group, X is a hydrogen atom or an alkyl group, “a” is a positive number, “b” is 0 or a positive number, “c” is 0 or a positive number, “d” is 0 or a positive number, “e” is 0 or a positive number, “b/a” is a number between 0 and 10, “c/a” is a number between 0 and 5.0, “d/(a+b+c+d)” is a number between 0 and 0.3, and “e/(a+b+c+d)” is a number between 0 and 0.4) {in an amount such that the ratio of the mass of component (B) to component (A) is in the range of from 1/99 to 99/1};
- (C) an organopolysiloxane having, on average, at least 2 silicon-bonded aryl groups and, on average, at least 2 silicon-bonded hydrogen atoms in one molecule {in an amount such that the amount of the silicon-bonded hydrogen atoms in the present component per 1 mol of the total of the alkenyl groups in component (A) and component (B) is in the range of from 0.1 to 10 mol}, and
- (D) a hydrosilylation reaction catalyst (in a catalytic amount).
Dependencies are inferred from the claim text.