Patent ID: 6617449
Filing Date: 2003-09-09
Classification: C08B,C08L,Y10T

Abstract:
A polymer alloy which comprises a starch ester incorporated with a biodegradable resin, wherein hydrogens in reactive hydroxyl groups in the same starch molecule have been replaced by C2-4 acyl groups (referred to hereinafter as â€œshort-chain acyl groupâ€ ) and C6-18 acyl groups (referred to hereinafter as â€œlong-chain acyl groupâ€ ), the degree of substitution by the short- and long-chain acyl groups are regulated so as to make the polymer alloy thermo-plasticized and moldable even in the absence of a plasticizer; and wherein the glass transition point of the starch ester by differential thermal analysis (JIS K 7121: referred to hereinafter as the â€œglass transition pointâ€ ) is 130Â° C. or less.