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发明授权
CN106795308B 纤维素酰化物薄膜、纤维素酰化物薄膜的制造方法、层叠体、偏振片及液晶显示装置 有权

纤维素酰化物薄膜、纤维素酰化物薄膜的制造方法、层叠体、偏振片及液晶显示装置
摘要：
本发明的课题在于提供一种提高起偏器的耐久性的同时，抑制用于提高起偏器的耐久性的添加剂渗出的纤维素酰化物薄膜、纤维素酰化物薄膜的制造方法、层叠体、偏振片及液晶显示装置。根据本发明，可提供一种包含满足a～c的必要条件的有机酸的纤维素酰化物薄膜，其中，纤维素酰化物薄膜的膜厚为3μm以上，纤维素酰化物薄膜的一表面至深度0～0.2μm为止的区域中的有机酸的平均浓度比上述区域以外的剩余区域中的有机酸的平均浓度低，a：包含通过形成多元醇与多元羧酸的酯键来键合的结构；b：形成上述有机酸的多元醇和1元以上的羧酸的分子数的合计为3以上；c：至少具有一个源自多元羧酸的未取代羧基。
摘要（英）：

The present invention provides a cellulose acylate film, containing: an organic acid satisfying requirements of a to c, in which a film thickness of the cellulose acylate film is greater than or equal to 3 μm, and an average concentration of the organic acid in a region from one surface of the cellulose acylate film to a depth of 0 to 0.2 μm is lower than an average concentration of the organic acid in a residual region other than the region: a: having a structure in which polyhydric alcohol and a polyvalent carboxylic acid are bonded by forming an ester bond; b: the total number of molecules of polyhydric alcohol and a monovalent or more carboxylic acid forming the organic acid being greater than or equal to 3; and c: having at least one non-substituted carboxyl group derived from a polyvalent carboxylic acid.

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