Silicone composition and a pressure sensitive adhesive film having a pressure sensitive adhesive layer made from the composition

A pressure sensitive adhesive film comprising a substrate film and a pressure sensitive adhesive layer on a surface of the substrate film, said pressure sensitive adhesive layer formed from a silicone composition comprising:

• (A) a diorganopolysiloxane having at least two alkenyl groups in a molecule and having a viscosity at 25° C. of from 10,000 to 1,000,000 mPa·s, in an amount of from 60 to 80 mass % based on the mass of the composition;
• (B) a diorganopolysiloxane having at least one alkenyl group in a molecule, and being raw and rubber-like at 25° C. or having a viscosity at 25° C. of more than 1,000,000 mPa·s, in an amount of from greater than 0 to 10 mass % based on the mass of the composition;
• (C) an organopolysiloxane resin represented by the following average unit formula:
• (R13SiO1/2)x(SiO4/2)1.0
• wherein each R1 represents a halogen-substituted or un-substituted monovalent hydrocarbon group free from an alkenyl group and x is a number from 0.5 to 1.0, in an amount of from 0.5 to 20 mass % based on the mass of the composition;
• (D) an organohydrogenpolysiloxane having at least two silicon-bonded hydrogen atoms in a molecule, in a quantity that provides from 0.1 to 10 moles of the silicon-bonded hydrogen atoms in this component per 1 mole of the total alkenyl groups in the composition;
• (E) silica fine powder in an amount of from 0.5 to 5 mass % based on the mass of the composition;
• and
• (F) a hydrosilylation catalyst in a quantity that accelerates hydrosilylation of the composition.