Foundry resins

Details Foundry resins Foundry resins

1996-06-06

1998-07-28

Jagannathan, Vasu

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

Synthetic resins

Processes of preparing a desired or intentional composition...

524399, 524590, 524875, 523143, B22C 118, B22C 120, C08K 310

Patent

active

057864098

ABSTRACT:
A process for making foundry cores and molds is disclosed as well as the core and molds which are produced as well as a sand binder. The binder is a resin which includes a lignin dissolved in a suitable solvent reacted and/or cured with an isocyanate material. The lignin used contains no more than 2% sodium ions. A polyether polyol may be added which has a functionality of greater than 3 and preferably at least 6. A tin catalyst is disclosed for use in the system which has a valence of +4 and one soluble in the system. A material is added to the system to give the mold or core a resistance to the water in core and mold washes. Suitable materials are propylene oxide derivatives of bis phenol A.

REFERENCES:
patent: 4292214 (1981-09-01), Blount
patent: 4352390 (1982-10-01), Larson
patent: 4851457 (1989-07-01), Kurple
patent: 5175228 (1992-12-01), Wang et al.
Kirk-Othmer, Encyclopedia of Chemical Technology vol. 15, 4th Ed. pp. 284-285.

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