Method for degrading a readily-degradable resin composition
AssigneeToyo Seikan Kaisha, Ltd.
InventorsSeishi Yoshikawa, Tsutaki Katayama, Masahito Kogure
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Abstract
A method for degrading a readily degradable resin composition comprising an aliphatic polyester (A) which is biodegradable, and an aliphatic polyester (B′) which releases an acid upon hydrolysis and which is biodegradable at a higher degradation rate than that of the aliphatic polyester (A), the method comprising degrading the readily degradable resin composition in an enzyme reaction liquid containing a degradation enzyme, and an acid neutralizing agent incompatible with the enzyme reaction liquid.
Claims5
A method for degrading a readily degradable resin composition comprising an aliphatic polyester (A) which is biodegradable, and an aliphatic polyester (B′) which releases an acid upon hydrolysis and which is biodegradable at a higher degradation rate than that of the aliphatic polyester (A), the method comprising:
- (a) determining the maximum activity pH value at which the degradation activity value of a hydrolase, when used to degrade a simple polymer of the aliphatic polyester (A) alone in a buffer solution, is maximized;
- (b) determining an active pH range in which the degradation activity value is not less than 30% of the degradation activity value at the maximum activity pH value;
- and
- (c) degrading the readily degradable resin composition in an enzyme reaction liquid containing the hydrolase, and having a pH which is within the active pH range and which is less than 8.0, wherein the pH of the enzyme reaction liquid is maintained within the active pH range and at less than 8.0 in the degradation step.
Dependencies are inferred from the claim text.