Patent ID: 7414096

Claim:
A solvent-free silicone composition for release paper, comprising: (A) an organopolysiloxane represented by the following average compositional formula (1) wherein R 1 is a substituted or unsubstituted monovalent C 1-10 hydrocarbon group which does not contain an aliphatic unsaturated bond, R 2 is an alkenyl group represented by the formula —(CH 2 ) p —CH═CH 2 , wherein p is an integer of from 0 to 6, the alkenyl group being contained in an amount of from 0.06 to 0.10 mole per 100 g of the organopolysiloxane (A), and a, b, and c are such numbers that a/c ranges from 0.05 to 0.2, b/c ranges from 0.5 to 1.0, and (a+b)/c ranges from 0.5 to 1.0; (B) an organopolysiloxane represented by the following average compositional formula (2) wherein R 1 and R 2 are as defined above, the alkenyl group being contained in an amount of from 0.4 to 0.7 mole per 100 g of the organopolysiloxane (B), and d, e, and f are such numbers that d/f ranges from 0.8 to 1.5, e/f ranges from 0 to 0.5, (d+e)/f ranges from 0.6 to 1.5, and a viscosity of the organopolysiloxane (B) at 25° C. ranges from 5 to 100 mPa·s; (C) an organopolysiloxane having alkenyl groups only at its ends, represented by the following formula (3) wherein R 1 and R 2 are as defined above, and g is such a number that a viscosity of the organopolysiloxane (C) at 25° C. ranges from 800 to 2000 mPa·s; and (D) an organohydrogenpolysiloxane represented by the following formula (4) wherein R 1 is as defined above, R 3 is a hydrogen atom or the same as R 1 , and j is an integer of from 8 to 20, wherein the component (A) is contained in an amount of from 10 to 30 wt %, the component (B) is contained in an amount of from 10 to 30 wt %, the component (C) is contained in an amount of from 40 to 80 wt %, based on a total weight of the components (A), (B) and (C), and the component (D) is contained in such an amount that a molar ratio of the hydrogen atom or atoms bonded to a silicon atom to a total of the alkenyl groups of the components (A), (B) and (C) ranges from 1.0 to 4.0.