Binder for casting sand and resin-coated grains of sand

Details Binder for casting sand and resin-coated grains of sand Binder for casting sand and resin-coated grains of sand

1981-01-23

1983-04-12

Morris, Theodore

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

Synthetic resins

Processes of preparing a desired or intentional composition...

523142, 527309, B22C 100, B22C 1122, C08G 1200, C08G 1212

Patent

active

043798659

ABSTRACT:
A binder for casting sand of the present invention comprises 5-95 wt. % of cellulose acetate and 5-95 wt. % of a thermosetting resin precondensate such as an alkylated methylolmelamine, alkylated methylolurea or a mixture of them, and it is used particularly for the casting carried out at a relatively low casting temperature. Up to about 50% of cellulose acetate may be replaced with an acetate of an aliphatic polyhydric alcohol or an alkyl phthalate. In the resin-coated grains of sand of the present invention, the grains of sand are coated with a binder comprising 5-95 wt. % of cellulose acetate and 5-95 wt. % of a thermosetting resin precondensate.

REFERENCES:
patent: 1942583 (1934-01-01), Walter
patent: 2375838 (1945-05-01), Coolidge et al.
patent: 2473463 (1949-06-01), Adams
patent: 2476127 (1949-07-01), West
patent: 2966422 (1960-12-01), Brandner
patent: 3491037 (1970-01-01), Keys et al.

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