Abstract: Disclosed is a liquid silicone composition for transfer- or injection-molding optical parts. The liquid silicone composition comprises: (A) a linear organopolysiloxane having in a molecule at least two silicon-bonded C2-10 alkenyl groups and at least one silicon-bonded C6-20 aryl group; (B) an organopolysiloxane resin represented by a specific average unit formula; (C) an organopolysiloxane having at least two silicon-bonded hydrogen atoms in a molecule; (D) a hydrosilylation reaction catalyst; and (E) a hydrosilylation reaction inhibitor.

Abstract: Disclosed is a liquid silicone composition for transfer- or injection-molding optical parts. The liquid silicone composition comprises: (A) a linear organopolysiloxane having in a molecule at least two silicon-bonded C2-10 alkenyl groups and at least one silicon-bonded C6-20 aryl group; (B) an organopolysiloxane resin represented by a specific average unit formula; (C) an organopolysiloxane having at least two silicon-bonded hydrogen atoms in a molecule; (D) a hydrosilylation reaction catalyst; and (E) a hydrosilylation reaction inhibitor.

Abstract: The present invention relates to a curable silicone composition comprising: (A) an organopolysiloxane represented by the average unit formula: (R13SiO1/2)a(R12SiO2/2)b (R2SiO3/2)c (R3SiO3/2)d, wherein, R1 are the same or different alkyl groups having from 1 to 12 carbons, alkenyl groups having from 2 to 12 carbons, aryl groups having from 6 to 20 carbons, or aralkyl groups having from 7 to 20 carbons, provided that at least two R1 in a molecule are the alkenyl groups; R2 is an aryl group having from 6 to 20 carbons or an aralkyl group having from 7 to 20 carbons; R3 is an alkyl group having from 1 to 12 carbons; and a, b, c, and d are respectively numbers satisfying: 0.01?a?0.5, 0?b?0.7, 0.01?c<0.7, 0.1?d<0.9, and a+b+c+d=1; (B) a linear organopolysiloxane having at least two silicon-bonded alkenyl groups and at least one silicon-bonded aryl group in a molecule; (C) an organopolysiloxane having at least two silicon-bonded hydrogen atoms in a molecule; (D) a hydrosilylation-reaction catalyst.

Abstract: The present invention relates to a curable silicone composition comprising: (A) an organopolysiloxane represented by the average unit formula: (R13SiO1/2)a(R12SiO2/2)b (R2SiO3/2)c (R3SiO3/2)d, wherein, R1 are the same or different alkyl groups having from 1 to 12 carbons, alkenyl groups having from 2 to 12 carbons, aryl groups having from 6 to 20 carbons, or aralkyl groups having from 7 to 20 carbons, provided that at least two R1 in a molecule are the alkenyl groups; R2 is an aryl group having from 6 to 20 carbons or an aralkyl group having from 7 to 20 carbons; R3 is an alkyl group having from 1 to 12 carbons; and a, b, c, and d are respectively numbers satisfying: 0.01?a?0.5, 0?b?0.7, 0.01?c<0.7, 0.1?d<0.9, and a+b+c+d=1; (B) a linear organopolysiloxane having at least two silicon-bonded alkenyl groups and at least one silicon-bonded aryl group in a molecule; (C) an organo polysiloxane having at least two silicon-bonded hydrogen atoms in a molecule; (D) a hydrosilylation-reaction catalyst.