Anti-sticking silicone compositions of non-solvent type

An anti-sticking silicone composition of non-solvent type having a viscosity within the range between 40 centistokes and 6,000 centistokes at 25.degree. C, which comprises

• a. a diorganopolysiloxane of substantially straightchain molecular structure having vinyldimethylsilyl terminal groups at both chain ends and having a viscosity within the range between 30 centistokes and 5,000 centistokes at 25.degree. C, more than 90% of the organic groups bonded to the silicon atoms other than the terminal silicon atoms therein being methyl groups and the remaining organic groups being monovalent organic groups having no aliphatic unsaturation,
• b. a diorganopolysiloxane of substantially straightchain molecular structure having hydrogendimethylsilyl terminal groups at both chain ends and having a viscosity within the range between 2 centistokes and 100 centistokes at 25.degree. C, more than 90% of the organic groups bonded to the silicon atoms other than the terminal silicon atoms therein being methyl groups and the remaining organic groups bineg monovalent organic groups having no aliphatic unsaturation,
• c. a methylvinylpolysiloxane having a viscosity within the range between 10 centistokes and gum-like consistency at 25.degree. C and having at least three vinyl groups bonded directly to the silicon atoms in one molecule,
• d. a methylhydrogenpolysiloxane having a viscosity within the range between 10 centistokes and 500 centistokes at 25.degree. C and having at least three hydrogen atoms bonded directly to the silicon atoms in one molecule, and
• e. a platinum-containing catalyst capable of accelerating the addition reaction between the vinyl groups bonded directly to the silicon atoms and the hydrogen atoms bonded directly to the silicon atoms the total amount of said components (a) and (b) being from 30 to 95% by weight based on the weight of the composition, the molar ratio of the hydrogen atoms bonded directly to the silicon atoms in said component (b) to the vinyl groups bonded directly to the silicon atoms in said component (a) being within the range between 0.1 and 1.0, and the molar ratio of the hydrogen atoms bonded directly to the silicon atoms in said components (b) and (d) to the vinyl groups bonded directly to the silicon atoms in said components (a) and (c) being within the range between 0.5 and 5.0.