Toyo Boseki Kabushiki Kaisha

Nitto-Denko Corporation

Tadashi Nakajima

Satomi Yoshie

Hitoshi Takahira

Nobukazu Kotera

Katsuya Shimeno

Takuma Kobayashi

Masami Oka

Hiroshi Taki

Hideyuki Ohashi

Shinpei Yamamoto

Daiki Funaoka

The present invention provides a polyester, a polyester composition and a pressure-sensitive adhesive composition capable of obtaining a pressure-sensitive adhesive which is global-environmentally friendly and is excellent in pressure-sensitive adhesion properties, using a plant-derived raw material; and a pressure-sensitive adhesive layer and a pressure-sensitive adhesive sheet which can be obtained by using the same. A polyester of the present invention is a polyester comprising at least a lactic acid unit, a dibasic acid unit and a glycol unit, wherein the dibasic acid unit contains dimer acid, and the polyester has a glass transition temperature as measured at a temperature rising rate of 20&#xb0; C./minute using a differential scanning calorimeter, of &#x2212;70 to &#x2212;20&#xb0; C., a weight average molecular weight of 20,000 to 300,000 and a hydroxyl value of 1 to 100 mgKOH/g.

Polyesters, polyester compositions, pressure-sensitive adhesive compositions, pressure-sensitive adhesive layers and pressure-sensitive adhesive sheets

A radiation curable resin having at least two (meth)acryloyl groups at both terminal ends of a molecular chain which is obtained by reaction of (1) a polyester polyol and/or polycarbonate polyol, (2) a diisocyanate, (3) a polyfunctional (meth)acrylate containing a hydroxyl group therein, and optionally (4) a compound having at least two active hydrogens in the molecule is disclosed. The resin has at least two (meth)acryloyl groups at a terminal end of the molecular chain. The molecular weight of the resin is 1,000 to 50,000, the urethane bonding concentration is not more than 3,000 equivalent/10.sup.6 g and the (meth)acryloyl group concentration is 100 to 6,000 equivalent/10.sup.6 g. A radiation curable resin composition containing the resin and a precoated metal using the composition are also disclosed.

Radiation curable resin, composition thereof and precoated metal made

Growing community of inventors

Ohtsu, Japan

Tadashi Nakajima