Patent ID: 8809469

Claim:
A curable organopolysiloxane composition containing: (A) a compound shown by the following average composition formula (1), wherein R 1 represents the same or different aliphatic unsaturated groups; R 2 represents the same or different unsubstituted or substituted monovalent hydrocarbon groups; R 3 represents the same or different unsubstituted or substituted aliphatic hydrocarbon groups; Ar represents the same or different unsubstituted or substituted aryl groups which may contain a heteroatom; and “n” and “m” represent positive numbers which satisfy n≧1, m≧1, and n+m≧10, (B) a hydrogen atom-containing organic silicon compound having at least two silicon atom-bonded hydrogen atoms per one molecule while not having an aliphatic unsaturated group, and (C) a hydrosilylatation catalyst which contains a platinum group metal, wherein the compound shown by the formula (1) of the component (A) is synthesized via a cyclic oligomer shown by the following average composition formula (2), wherein R 3 and Ar represent the same meanings as before; and n′ and m′ represent positive numbers which satisfy n′≧1 and m′≧1, and wherein the curable organopolysiloxane composition further contains the cyclic oligomer shown by the formula (2).