Polyurethane-forming foundry binders and their use

Details Polyurethane-forming foundry binders and their use Polyurethane-forming foundry binders and their use

1989-12-21

1992-03-31

Welsh, Maurice J.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

523142, 525480, 528162, C08G 804, B22C 122, C08F28300

Patent

active

051010011

ABSTRACT:
This invention relates to no-bake foundry binders and a no-bake process for preparing foundry shapes which utilizes polyurethane-forming foundry binders. The binders are unique because the isocyanate component preferably contains no solvent and the weight ratio of the phenolic resin component to isocyanate component is atypical. It has been found that the use of these binders in a no-bake process produces foundry shapes with improved tensile strengths.

REFERENCES:
patent: 3676392 (1972-07-01), Robins
patent: 4293480 (1981-10-01), Martin et al.

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