Patent ID: 8071707

Claim:
An addition-curable silicone composition, comprising: (A) an organopolysiloxane formed from R 1 SiO 1.5 units, R 2 2 SiO units, R 3 a R 4 b SiO (4-a-b)/2 units and R 3 c H d SiO (4-c-d)/2 units, wherein each R 1 , R 2 and R 3 represents, independently, a hydroxyl group, methyl group, ethyl group, propyl group, cyclohexyl group, or phenyl group, each R 4 represents, independently, a vinyl group or allyl group, a represents 0, 1 or 2 and b represents 1 or 2, provided that a+b is 2 or 3, and c represents 0, 1 or 2 and d represents 1 or 2, provided that c+d is 2 or 3, including a structure in which at least a portion of the R 2 2 SiO units are connected together in a continuous repeating sequence, and a number of units in the continuous repeating sequence is within a range from 5 to 300, and having a molar ratio of hydrogen atoms bonded to silicon atoms relative to a total of all vinyl groups and/or allyl groups bonded to silicon atoms that exist within a molecule of 0.1 to 4.0, and (B) a platinum group metal-based catalyst in an effective amount for curing.