CELLULOSE ACETATE FILM, AND POLARIZING PLATE AND LIQUID CRYSTAL DISPLAY DEVICE WHICH ARE MADE USING SAME
申请人:Konica Minolta Advanced Layers, Inc.
公开号:EP2565228A1
公开(公告)日:2013-03-06
Provided is a cellulose acetate film which has excellent retardation properties and exhibits low haze even under high-temperature and high-humidity conditions and which, in an alkaline saponification step, causes little dissolution of the film itself or additives in a saponifying liquid. The cellulose acetate film is characterized by comprising: a cellulose acetate which has an acetyl substitution degree of 2.0 to 2.5; and 5 to 15% by mass (relative to the cellulose acetate) of a component which contains a compound represented by general formula (1) wherein m is 0 and a compound represented thereby wherein m is more than 0 at a ratio of 45:55 to 0:100. In general formula (1), G is a mono- or di-saccharide residue; X1 is -O-; R1 is -CO-R2; R2 is an aliphatic or aromatic group; m represents the total number of hydroxyl groups directly bonded to the mono- or di-saccharide residue; and n represents the total number of OR1 groups directly bonded to the mono- or di-saccharide residue, with the proviso that m and n satisfy the relationships: 3 ≤ m+n ≤ 8 and n is not 0.
本发明提供了一种醋酸纤维素薄膜,它具有优异的缓凝性能,即使在高温高湿条件下也能表现出较低的雾度,而且在碱性皂化步骤中,薄膜本身或添加剂在皂化液中的溶解度很小。醋酸纤维素薄膜的特征在于:醋酸纤维素的乙酰取代度为 2.0 至 2.5;以及 5%至 15%(相对于醋酸纤维素质量)的组分,该组分包含通式(1)所代表的化合物,其中 m 为 0,以及通式(1)所代表的化合物,其中 m 大于 0,两者的比例为 45:55 至 0:100。在通式(1)中,G 是单糖或二糖残基;X1 是-O-;R1 是-CO-R2;R2 是脂肪族或芳香族基团;m 代表直接键合在单糖或二糖残基上的羟基总数;n 代表直接键合在单糖或二糖残基上的 OR1 基团总数,但 m 和 n 满足以下关系:3≤m+n≤8 且 n 不为 0。