Resin coated sand composition and method of producing same

Details Resin coated sand composition and method of producing same Resin coated sand composition and method of producing same

1983-06-16

1984-07-17

Jacobs, Lewis T.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

524259, 524260, C08K 532

Patent

active

044607172

ABSTRACT:
A resin coated sand for shell-molding foundry operations having improved shake-out properties for molds prepared therefrom is disclosed. Also disclosed are methods of producing said sand. The foundry aggregates or sand are coated with a phenolic resin containing from 0.2 to 40 parts of an aromatic nitro compound per 100 parts of phenolic resin. The resin may be a novolac type, a resole type or a mixture of the two types of phenolic resins. Suggested aromatic nitro compounds are nitrophenols, dinitrophenols and nitronaphthalenes. The process is extremely useful for coating lower melting temperature metals such as aluminum and magnesium.

REFERENCES:
patent: 3917558 (1975-11-01), Gardikes et al.
patent: 4252700 (1981-02-01), Funabiki et al.
patent: 4290928 (1981-09-01), Funabiki et al.
patent: 4336179 (1982-06-01), Iyer
patent: 4379866 (1983-04-01), Henry et al.

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