To obtain a cellulose derivative resin composition improved in flexibility, non-volatility, and bleed-out resistance by mixing a vinyl (co)polymer having amido bonds as side chains with a cellulose derivative.
An amido-containing vinyl monomer (1-100 mol%, particularly, 2-100 mol%) is (co)polymerized with, optionally, an arbitrary copolymerizable vinyl monomer in the presence of a radical polymerization initiator to obtain a plasticizer comprising a vinyl (co)polymer (except a polyvinylpyrrolidone, polyacryloylmorpholine, or an N-vinylpyrrolidone/vinyl acetate copolymer) having amide bonds as side chains and having a number-average molecular weight of 1,000-500,000, particularly, 5,000-200,000. A cellulose derivative resin composition is obtained by kneading 2-98 wt.% above plasticizer and at least one cellulose derivative having a degree of acetylation of at least 52% and selected from among cellulose acetate, cellulose acetate propionate, and cellulose acetate butyrate.
MIYASHITA YOSHIHARU
KAJIKAWA YASUTERU
NAKADA KOJI
