Foundry binder composition

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...

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524595, C08K 336

Patent

active

044593740

ABSTRACT:
This invention is concerned with foundry binder compositions for alkaline aggregates such as reclaimed sand, Olivia sand, alumina sand, etc., which cure at ambient temperatures. The binder composition is composed of phenolic resins, polyisocyanates and a hydrogen chloride emitting substance upon hydrolysis. Curing of this composition is by gaseous amines. The hydrogen chloride emitting substance on hydrolysis is selected from the following: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 can be selected from: Hydrogen, Chlorine, alkyl, vinyl or alkoxy, or

REFERENCES:
patent: 3432457 (1969-03-01), Robins
patent: 3702316 (1972-11-01), Robins
patent: 4311631 (1982-01-01), Myers et al.

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