Resin coated foundry sand using crystalline unsaturated polyeste

Details Resin coated foundry sand using crystalline unsaturated polyeste Resin coated foundry sand using crystalline unsaturated polyeste

1980-06-06

1982-12-28

Pertilla, Theodore E.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

523512, 524492, 525445, C08L 6706

Patent

active

043662692

ABSTRACT:
Resin coated foundry sand, using a binder composition comprising 100 parts by weight of a crystalline unsaturated polyester and, as a cross-linking agent, 5 to 30 parts by weight of diallyl phthalate monomer. The binder is a scarcely tacky solid at room temperature but at a temperature somewhat above its softening temperature assumes a fluid state and exhibits a viscosity below about 500 poises. The resin coated sand is prepared by mixing heated foundry sand with the binder composition, with the addition of an organic peroxide which serves as a curing catalyst. Moulds and cores formed of this resin coated sand are high in initial strength but, nevertheless, can easily be disintegrated at the shake-off stage even when a relatively low pouring temperature is employed as in an aluminum alloy casting process.

REFERENCES:
patent: 2930089 (1960-03-01), Emblem et al.
patent: 3962162 (1976-06-01), Schmank

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