Patent ID: 7955703

Claim:
A silicone rubber based pressure sensitive adhesive sheet comprising: a transparent substrate film and a silicone rubber layer; wherein the adhesive sheet is formed by a process comprising coating the surface of the transparent substrate film with silicone rubber in an amount of from 30 to 100 g/m 2 after drying, to form the adhesive sheet, and then curing the resulting coating; wherein the silicone rubber comprises: an addition organopolysiloxane comprising an organopolysiloxane having a siloxane bond as a principal skeleton and bearing an alkenyl group and an organohydrogenpolysiloxane, wherein the organopolysiloxane having a siloxane bond as a principal skeleton and bearing an alkenyl group is a compound represented by the following average unit formula (1) and has at least two alkenyl groups, R 1 a SiO (4-a)/2 (1) wherein R 1 is a same or different non-substituted or substituted univalent hydrocarbon group having 1 to 12 carbon atoms, and a is a positive number ranging from 1.5 to 2.8, from 0.01 to 3.0 parts by mass of a platinum catalyst based on 100 parts by mass of said addition organopolysiloxane, and a silicone resin which is present and in amount no greater than 10 parts by mass, based on 100 parts by mass of said addition organopolysiloxane; wherein the silicone resin comprises trifunctional or tetrafunctional siloxane units, wherein the adhesive sheet has adhesion for float glass in accordance with JIS Z 0237 being in the range of 10 to 1000 mN/25 mm, a holding power, with a load of one kg, of at least 24 hours, and a 100% modulus in the range of 0.3 to 1.5 MPa.