申请人:Sharp Kabushiki Kaisha
公开号:EP2821817A1
公开(公告)日:2015-01-07
The present invention provides a laminated body including an antireflection film onto the surface of which bonded is a protection film excellent in the temporary adhesiveness and hardly undergoing the occurrence of adhesive deposit after being peeling off. The laminated body of the present invention is a laminated body including: an antireflection film; and a protection film bonded onto the antireflection film, wherein the surface of the antireflection film includes a plurality of protrusions wherein the width between the tops of adjacent protrusions is equal to or less than the visible light wavelength; the protection film includes a supporting film and an adhesive layer in contact with the antireflection film; the adhesive layer is a layer constituted with a material formed by cross-linking, with a cross-linking agent (B), a (meth)acrylic acid ester copolymer (A); the weight-average molecular weight of the (meth)acrylic acid ester copolymer (A) is 600,000 or more and less than 1,500,000; the (meth)acrylic acid ester copolymer (A) is a copolymer formed by polymerizing monomer components including, in relation to the total amount of the monomer components set at 100% by mass, 70 to 98% by mass of a (meth)acrylic acid alkyl ester monomer (a) including a noncyclic alkyl group containing 4 to 9 carbon atoms, 1.5 to 25% by mass of a (meth)acrylic acid ester monomer (b) containing an aliphatic ring, and 0.5 to 5% by mass of a (meth)acrylic-based monomer (c) containing a functional group exhibiting reactivity with the cross-linking agent (B); and the area proportion of the components each having a molecular weight of 100,000 or less, obtained by gel permeation chromatography measurement, in relation to the area of the whole of the (meth)acrylic acid ester copolymer (A) set at 100%, is less than 3.0%.
本发明提供了一种层压体,该层压体包括抗反射膜,在抗反射膜的表面粘合有临时粘合性优异且剥离后几乎不会出现粘合沉积的保护膜。本发明的层压体是一种层压体,包括抗反射膜;以及粘合在抗反射膜上的保护膜,其中抗反射膜的表面包括多个突起,相邻突起顶部之间的宽度等于或小于可见光波长;保护膜包括支撑膜和与抗反射膜接触的粘合层;粘合层是由(甲基)丙烯酸酯共聚物(A)与交联剂(B)交联形成的材料构成的层;(甲基)丙烯酸酯共聚物(A)的重量-平均分子量为 600,000 或更大,小于 1,500,000 ; (甲基)丙烯酸酯共聚物(A)是由单体组分聚合而成的共聚物,单体组分包括(相对于单体组分总量而言)质量百分比为 100%、质量百分比为 70% 至 98% 的(甲基)丙烯酸烷基酯单体(a)(包括含有 4 至 9 个碳原子的非环烷基)、质量百分比为 1.5%至 25%(质量百分比)的含有脂肪族环的(甲基)丙烯酸酯单体(b),以及 0.5%至 5%(质量百分比)的含有与交联剂(B)发生反应的官能团的(甲基)丙烯酸基单体(c);通过凝胶渗透色谱法测量得到的分子量在 100,000 或以下的各组分的面积占(甲基)丙烯酸酯共聚物(A)整体面积的比例设定为 100%,小于 3.0%。