Is Butanedioic acid, polymer with 1,4-butanediol vegan?

Polybutylene Succinate is also known as Butanedioic acid, polymer with 1,4-butanediol.

Polybutylene Succinate (PBS) is a biodegradable thermoplastic polyester produced by the polymerization of succinic acid and 1,4-butanediol, with physical properties comparable to polypropylene.

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