POLYESTERS, POLYESTER COMPOSITIONS, ADHESIVE COMPOSITIONS, ADHESIVE LAYERS AND ADHESIVE SHEETS
申请人:Nitto Denko Corporation
公开号:EP2311896A1
公开(公告)日:2011-04-20
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°C/minute using a differential scanning calorimeter, of -70 to -20°C, a weight average molecular weight of 20,000 to 300,000 and a hydroxyl value of 1 to 100 mgKOH/g.
本发明提供了一种聚酯、一种聚酯组合物和一种压敏胶组合物,能够利用植物衍生原料获得全球环保且压敏粘合性能优异的压敏胶;以及利用上述聚酯、聚酯组合物和压敏胶组合物可以获得压敏胶层和压敏胶片。本发明的聚酯是一种至少包含一个乳酸单元、一个二元酸单元和一个乙二醇单元的聚酯,其中二元酸单元包含二聚酸,并且该聚酯在使用差示扫描量热仪以 20°C / 分钟的升温速率测量时的玻璃化转变温度为 -70 至 -20°C,重量平均分子量为 20,000 至 300,000 和羟基值为 1 至 100 mgKOH/g。