Binder composition for foundry sand molds

Details Binder composition for foundry sand molds Binder composition for foundry sand molds

1980-09-16

1982-11-09

Cockeram, H. S.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

521117, 523143, 525504, 528 67, 528 49, C08G 1876, C08G 1830

Patent

active

043585701

ABSTRACT:
A binder composition for foundry sands comprises (a) a polyisocyanate compound (e.g., polymethylene polyisocyanate), (b) a polyol compound (e.g., a polyol compound having as its principal constituent a polyether polyol of being at least bifunctional), and (c) an alkylphenol and/or an alkylphenol derivative (e.g., nonylphenol). In this binder composition, the equivalent weight ratio of the isocyanate group of component (a) and the hydroxyl group of component (b) is from 0.3:1 to 3:1, and the quantity of component (c) is 3 to 150 parts by weight relative to 100 parts by weight of the sum of the quantities of components (a) and (b).

REFERENCES:
patent: 3409579 (1968-11-01), Robins
patent: 3494880 (1970-02-01), Austin
patent: 3676392 (1972-07-01), Robins
patent: 3702316 (1972-11-01), Robins
patent: 3726867 (1973-04-01), Robins
patent: 4079031 (1978-03-01), Sardessai et al.

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