Process for the preparation of foundry cores and molds

Details Process for the preparation of foundry cores and molds Process for the preparation of foundry cores and molds

1991-12-19

1994-02-15

Michl, Paul R.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

164526, 164 21, C08G 836

Patent

active

052867650

ABSTRACT:
This invention relates to a process for the preparation of foundry cores and molds by mixing a filler and a casting resin mixture and then curing the resultant mixture. The casting resin mixture is made from (a) 25 to 99.9% of at least one organic polyisocyanate, (b) 0.1 to 50% of at least one organic compound containing at least two epoxide groups, and (c) up to 50% of a polyhydroxyl compound, the quantities being based on the total quantity of resin.

REFERENCES:
patent: 3428110 (1969-02-01), Walker et al.
patent: 3431969 (1969-03-01), Robins
patent: 3904554 (1975-09-01), Furness et al.
patent: 3933727 (1976-01-01), Schmid
patent: 3947429 (1976-03-01), Bardet
patent: 4051092 (1977-09-01), Holik et al.
patent: 4562227 (1985-12-01), Rogler et al.
patent: 4582723 (1986-04-01), Markert et al.
patent: 4728676 (1988-03-01), Muller et al.
patent: 4788224 (1988-11-01), Muller et al.

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