Foundry resins

Details Foundry resins Foundry resins

1988-02-16

1989-07-25

Jacobs, Lewis T.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

524590, 524875, B22C 120

Patent

active

048514578

ABSTRACT:
A process for making sand cores or molds is disclosed; the completed cores and molds as well as a binder for holding the sand particles together. The resin binder is used in the process and in the finished product comprising lignin dissolved in a suitable solvent reacted on or cured with an isocyanate material. Curing can be accomplished by the use of an amine along with a catalyst if desired. A polyether polyol may be integrated with the lignin to vary the physical characteristics of the binder.

REFERENCES:
patent: 3072634 (1963-01-01), Santelli et al.
patent: 3577358 (1971-05-01), Santelli et al.
patent: 3862080 (1975-01-01), Standen et al.
patent: 3933727 (1976-01-01), Schmid
patent: 4293480 (1981-10-01), Martin et al.

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