Provided are a water-dispersible acrylic pressure-sensitive adhesive composition capable of forming a pressure-sensitive adhesive layer which has excellent resistance to increase in adhesive strength and a good appearance and less causes staining; and a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition. The water-dispersible acrylic pressure-sensitive adhesive composition includes an acrylic emulsion polymer (A) formed from constitutive monomers essentially containing 70 to 99.5 percent by weight of a (meth)acrylic alkyl ester and 0.5 to 10 percent by weight of a carboxyl-containing unsaturated monomer; and a compound (B) represented by following Formula (I):
R1O-(PO)a-(EO)b-(PO)c-R2 (I)
wherein R1 and R2 each represent a linear or branched chain alkyl group or hydrogen atom; PO represents oxypropylene group; EO represents oxyethylene group; and "a," "b," and "c" are each a positive integer, where EO and POs are added in a block manner.
本发明提供了一种可遇
水分散的
丙烯酸压敏胶组合物,该组合物能够形成压敏胶层,该压敏胶层具有极佳的抗粘合强度增加能力和良好的外观,并且不易沾污;还提供了一种压敏胶片,该压敏胶片具有由该压敏胶组合物形成的压敏胶层。
水可分散
丙烯酸压敏胶组合物包括
丙烯酸乳液聚合物 (A),该聚合物由基本上含有 70% 至 99.5% 重量百分比的 (甲基)
丙烯酸烷基酯和 0.5% 至 10% 重量百分比的含羧基不饱和单体的组成单体形成;以及由下式 (I) 表示的化合物 (B):
R1O-(PO)a-(
EO)b-(PO)c-R2 (I)
其中 R1 和 R2 分别代表直链或支链烷基或氢原子;PO 代表氧
丙烯基团;
EO 代表氧
乙烯基团;"a"、"b "和 "c "均为正整数,其中
EO 和 PO 是以嵌段方式添加的。