MODIFIED CELLULOSE ACYLATE AND MOLDED BODY FOR OPTICAL USE

摘要

Disclosed is a modified cellulose acylate (for example, a modified cellulose acetate), which is excellent in optical isotropy and suitably used for optical films and the like. Specifically disclosed is a hydroxy acid-modified cellulose acylate having a cellulose acylate (such as cellulose acetate) and a graft chain formed by graft-polymerizing a hydroxy acid component (for example, a hydroxy acid such as lactic acid and a cyclic ester such as lactone and lactide) to a hydroxyl group of the cellulosed acylate. In this hydroxy acid-modified cellulose acylate, the substitution degree of acyl groups in the cellulose acylate is not less than 2.7, and the ratio of the graft-polymerized hydroxy acid component relative to 1 mole of the glucose unit of the cellulose acylate is 0.1-5 moles on average in terms of the hydroxy acid.