Patent ID: 9309402
Filing Date: 2016-04-12
CPC Classification: C08L

Claim Text:
1. A biodegradable resin composition, comprising: a copolymer (A) with a weight average molecular weight of 2,500 to 20,000, which comprises a constituent unit (a-1) derived from a hydroxydicarboxylic acid and a hydroxytricarboxylic acid and a constituent unit (a-2) derived from a hydroxycarboxylic acid or a hydroxy carboxylic acid derivative selected from glycolic acid, lactic acid, 2-hydroxybutyric acid, 2-hydroxyvaleric acid, 2-hydroxycaproic acid, 2-hydroxycapric acid, glycolide, lactide, p-dioxanone, β-propiolactone, β-butyrolactone, δ-valerolactone or ε-caprolactone, and a biodegradable resin (B) that is different from the copolymer (A), wherein the copolymer is obtained by mixing the hydroxydicarboxylic acid and the hydroxytricarboxylic acid and the hydroxycarboxylic acid or hydroxycarboxylic acid derivative and by carrying out dehydration condensation polymerization under heat and reduced pressure in the presence or absence of a catalyst, and wherein the mol composition ratio [(a-1)/(a-2)] of constituent unit (a-1) and constituent unit (a-2) in copolymer (A) is 1/10 to 1/50, and wherein a constituent unit other than the constituent units (a-1) and (a-2) in the copolymer (A) is 20 mol % or less, and wherein the biodegradable resin composition has a weight average molecular weight of 50,000 to 1,000,000.