| 摘要 |
A pressure-sensitive adhesive layer of pressure-sensitive adhesive sheet is formed by using: a pressure-sensitive adhesive composition comprising (A) a polyrotaxane having a linear-chain molecule passing through opening portions of at least two cyclic molecules, the cyclic molecules having a reactive group, the polyrotaxane having blocking groups at both ends of the linear-chain molecule, and (B) a pressure-sensitive adhesive polymer having two or more functional groups capable of reacting with the reactive group; or, a pressure-sensitive adhesive composition comprising (A) a polyrotaxane having a linear-chain molecule passing through opening portions of at least two cyclic molecules, the cyclic molecules having a reactive group, the polyrotaxane having blocking groups at both ends of the linear-chain molecule, (B′) a pressure-sensitive adhesive polymer having two or more reactive groups, and (C) a compound having two or more functional groups capable of reacting with the reactive group of the polyrotaxane (A) and the reactive groups of the polymer (B′). As a result there can be provided a pressure-sensitive adhesive sheet comprising a pressure-sensitive adhesive layer excellent in flexibility and having high gel fraction and durability, and a pressure-sensitive adhesive composition that constitutes the pressure-sensitive adhesive layer. |
| 主权项 |
1. A pressure-sensitive adhesive sheet, comprising:a support sheet selected from the group consisting of a substrate sheet and a release sheet, and
a pressure-sensitive adhesive layer formed on the support sheet using a pressure-sensitive adhesive composition, comprising: (A) a polyrotaxane having a linear-chain molecule passing through opening portions of at least two cyclic molecules, said cyclic molecules having a reactive group, said polyrotaxane having blocking groups at both ends of said linear-chain molecule; and (B) a pressure-sensitive adhesive polymer having two or more functional groups capable of reacting with said reactive group, wherein the pressure-sensitive adhesive polymer (B) is a polyacrylate, and the weight-average molecular weight of the polyacrylate is 100,000 to 2,000,000, said reactive group is at least one selected from the group consisting of hydroxyl group, carboxyl group and amine group, the glass transition temperature (Tg) of said pressure-sensitive adhesive polymer is not higher than 50° C., and the pressure-sensitive adhesive sheet has a holding power defined by applying the pressure-sensitive adhesive sheet onto another substrate, the pressure sensitive adhesive composition being held on the substrate for 70,000 seconds after displacement of the pressure sensitive sheet of not less than 100 μm in accordance with JIS Z0237. |
