Low free formaldehyde phenolic polyol formulation

Details Low free formaldehyde phenolic polyol formulation Low free formaldehyde phenolic polyol formulation

1991-06-12

1993-02-23

Kight, III, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

523139, 523143, 523145, 523147, 528129, 528137, 528140, 528142, 528161, 528214, C08G 836

Patent

active

051890798

ABSTRACT:
A resin is prepared by the reaction of a phenol, an aldehyde and an aliphatic hydroxy compound containing two or more hydroxy groups per molecule in the presence of a divalent metal ion catalyst. These resins react with polyisocyanates to form polyurethanes that are useful binders for foundry cores and molds.

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