| http://www.w3.org/ns/prov#value | - The method for the reaction between the chain-extending agent and the polyester is not especially limited, but examples thereof include: amethod comprising the steps of dissolving the polyester into an appropriate solvent and then causing the polyester to react with the chain-extending agent; and a method comprising the steps of heat-melting the polyester and then causing the polyester toreact wit
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