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US4988745A Ester hardeners for phenolic resin binder systems 失效
酚醛树脂粘合剂系统的酯类固化剂

Ester hardeners for phenolic resin binder systems
摘要:
A hardener composition for alkaline phenolic resole resin binders which comprises a solution of a benzylic ether resole resin in an ester. Binder compositons comprising this hardener with alkaline phenolic resole resins are further provided as are foundry molding compositions and methods for making foundry cores and molds using the molding compositions.
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