申请人:Nitto Denko Corporation
公开号:EP2492327A1
公开(公告)日:2012-08-29
Provided is a masking pressure-sensitive adhesive tape that is produced using a plant-derived raw material, is global environmentally-friendly, has stable adherability to adherends and its own backside, has low adhesive strength to its own backside when unwound at high speed, and has good workability (peelability). The masking pressure-sensitive adhesive tape includes a substrate and a pressure-sensitive adhesive layer that is provided on at least one side of the substrate and made from a polyester-based pressure-sensitive adhesive composition containing a polyester including at least a lactic acid unit, a dibasic acid unit, and a glycol unit, and a crosslinking agent, wherein the dibasic acid unit includes a dimer acid, the polyester has a weight average molecular weight of 20,000 to 200,000 and a glass transition temperature of -70 to -20°C as measured using a differential scanning calorimeter at a temperature rise rate of 20°C/minute, the polyester has a hydroxyl value of 1 to 60 mgKOH/g, and the pressure-sensitive adhesive layer has a gel fraction of 40 to 90% by weight.
本发明提供了一种遮蔽压敏胶带,它使用植物提取的原材料生产,对全球环境友好,对粘合剂和自身背面具有稳定的粘合性,高速展开时对自身背面的粘合强度低,并且具有良好的可加工性(可剥离性)。遮蔽压敏胶带包括基材和压敏胶层,压敏胶层至少设置在基材的一面,由聚酯基压敏胶组合物制成,该组合物含有至少包括乳酸单元、二元酸单元和乙二醇单元的聚酯以及交联剂,其中二元酸单元包括二聚酸、聚酯的重量平均分子量为 20,000 至 200,000,使用差示扫描量热计在 20°C / 分钟的升温速率下测得的玻璃化转变温度为 -70 至 -20°C,聚酯的羟值为 1 至 60 mgKOH/g,压敏胶层的凝胶部分的重量百分比为 40% 至 90%。