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
申请人:Dow Corning Toray Co., Ltd.
公开号:EP2524954A1
公开(公告)日:2012-11-21
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.
问题:提供一种硅酮基可释放粘合剂组合物,该组合物能够轻松控制可释放粘合剂层的剥离力,并且硅酮基可释放粘合剂组合物具有优异的附着特性和可释放特性。另一个目的是提供一种片状基材和可释放粘合剂片材,它们具有通过固化该组合物形成的可释放粘合剂层。
解决手段:硅酮基可释放粘合剂组合物包括有机聚硅氧烷树脂-有机聚硅氧烷缩合反应产物,该缩合反应产物由以下物质缩合反应得到:(a1) 100 重量份的 MQ 型有机聚硅氧烷树脂,该树脂含有羟基或烷氧基,其羟基或烷氧基的重量百分比范围为 0.3 至 2.0,且 M 单位与 Q 单位的摩尔比为 0.6至1.0,以及(a2)20至150重量份的平均聚合度为100至1,000并具有至少一个羟基或烷氧基的链状二甘醇聚硅氧烷,其中有机聚硅氧烷树脂-有机聚硅氧烷缩合反应产物最好包括一定的羟基含量。