Nitto-Denko Corporation

Miki Tanimura

Shinichi Inoue

Satomi Yoshie

Hitoshi Takahira

Tomohide Banba

Shinpei Yakuwa

The present invention provides a pressure-sensitive adhesive sheet containing a pressure-sensitive adhesive layer that contains a polyester resin as a main component, in which the pressure-sensitive adhesive layer having a laminate structure that contains at least one layer LA where a polyester resin Ehaving Mw of from 4&#xd7;10to 12&#xd7;10is crosslinked and at least one layer LB where a polyester resin Ehaving Mw of from 0.2&#xd7;10to 1&#xd7;10is crosslinked, and at least one surface of the pressure-sensitive adhesive layer is constituted by the layer LA.

Adhesive sheet

The present invention has an object to provide a solvent-free polyester-based adhesive composition having good coatability and capable of forming an adhesive that shows good adhesion performance. The present invention provides a polyester-based adhesive composition containing a polyester having Mw of from 1&#xd7;10to 20&#xd7;10as a main component and a trifunctional or more polyepoxy compound as a crosslinking agent, and containing substantially no organic solvent. The molar number, m, of hydroxyl group contained in a polyalcohol component constituting the polyester is from 0.5 to 0.98 times of the molar number, m, of carboxyl group contained in a polycarboxylic acid component. The composition has a viscosity at 23&#xb0; C. of at most 80 Pa&#xb7;s.

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Osaka, Japan

Miki Tanimura