RE-ADHERABLE SILICONE-BASED ADHESIVE COMPOSITION, SHEET-SHAPED BASE MATERIAL HAVING RE-ADHERABLE ADHESIVE LAYER OBTAINED BY CURING SAID COMPOSITION, AND USE OF SAID BASE MATERIAL AS PROTECTIVE FILM OR AFFIXING SHEET

摘要

Problem: To provide a silicone-based releasable adhesive composition that is capable of easily controlling peeling force of a releasable adhesive layer by the composition, and whereby the silicone-based releasable adhesive composition has excellent attachment characteristics and releasability characteristics. A further object is to provide a sheet-form substrate and a releasable adhesive sheet that have a releasable adhesive layer formed by curing this composition. Resolution Means: The silicone-based releasable adhesive composition includes an organopolysiloxane resin-organopolysiloxane condensation reaction product obtained by condensation reaction between (a1) 100 weight parts of an MQ type organopolysiloxane resin containing hydroxyl groups or alkoxy groups in a range of 0.3 to 2.0 weight% and having an M unit to Q unit molar ratio of 0.6 to 1.0, and (a2) 20 to 150 weight parts of a chain-like diorganopolysiloxane having an average degree of polymerization of 100 to 1,000 and having at least one hydroxyl group or alkoxy group, wherein the organopolysiloxane resin-organopolysiloxane condensation reaction product preferably includes a certain hydroxyl group content.