A pressure-sensitive adhesive is provided. The adhesive comprises (a) about 50 to 95 weight percent of an ultraviolet radiation polymerized polymer of (i) one or more monomers which are predominantly alkyl acrylate, the alkyl groups of which have an average of 4 to 12 carbon atoms and (ii) about 0 to 15 weight percent of one or more strongly polar copolymerizable monomers or about 0 to 30 weight percent of one or more moderately polar copolymerizable monomers; and (b) about 5 to 50 weight percent of one or more tackifying resins. The tackifying resins are aliphatic polymeric resins which have a number average molecular weight of about 300 to 2500, a polydispersity index of less than about 5, a glass transition temperature of about 40 to 120°C, and a solubility parameter of about 7 to 9.5 (cal/cc)-1/2. The adhesive has a monomer conversion factor of at least 95%.
提供了一种压敏粘合剂。该粘合剂包括:(a) 约 50 至 95 重量百分比的紫外线辐射聚合聚合物,该聚合物由以下单体组成:(i) 一种或多种主要为
丙烯酸烷基酯的单体,其烷基平均具有 4 至 12 个碳原子;(ii) 约 0 至 15 重量百分比的一种或多种强极性可共聚单体,或约 0 至 30 重量百分比的一种或多种中等极性可共聚单体;以及 (b) 约 5 至 50 重量百分比的一种或多种增粘
树脂。增粘
树脂为脂肪族聚合
树脂,其平均分子量约为 300 至 2500,多分散指数小于约 5,
玻璃化温度约为 40 至 120°C,溶解度参数约为 7 至 9.5(卡/cc)-1/2。粘合剂的单体转换系数至少为 95%。