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US4453002A Formaldehyde condensates and their preparation 失效
甲醛缩合物及其制备

Formaldehyde condensates and their preparation
摘要:
Condensation products which are obtained from formaldehyde, di-hydroxyaryl sulphones, phenols, if desired, and hydroxyarylcarboxylic acids and are prepared in a one-stage reaction at pH values between 2 and 5 are suitable as fixing agents for basic dyestuffs.
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