Foundry resin components

Details Foundry resin components Foundry resin components

1977-10-28

1978-09-26

Marquis, Melvyn I.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

252182, 260841, 260 38, 528 79, 528129, C08K 506

Patent

active

041169166

ABSTRACT:
A new foundry binder composition comprises a selected phenol-formaldehyde resin, a polyisocyanate, and a selected solvent therefor. A preferred solvent is ketal or an acetal such as butyl acetal. The resole is essentially anhydrous, should contain about 8% free phenol, and is further preferably characterized by the presence of substituent --(CH.sub.2 --O).sub.n --R groups replacing a phenolic hydrogen, R being a hydrocarbon radical such as butyl. Methylene and ether bridges linking phenolic nuclei are predominantly ortho-para with some para-para bridges. Also disclosed is the admixture of a reactive polyisocyanate and a solvent such as butyl acetal.

REFERENCES:
patent: 3409579 (1968-11-01), Robins
patent: 3676392 (1972-07-01), Robins
patent: 3702316 (1972-11-01), Robins

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