Heat cured foundry mixes and their use

Details Heat cured foundry mixes and their use Heat cured foundry mixes and their use

1995-04-17

1997-03-04

Michl, Paul R.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

523144, 524563, 528249, 526270, B22C 122

Patent

active

056079869

ABSTRACT:
This invention relates to nitrogen free heat cured foundry mixes essentially free of free formaldehyde comprising (a) a nitrogen free modified furan resin, (b) furfuryl alcohol, (c) polyvinyl acetate, preferably(d) a tar selected from the group consisting of resorcinol pitch, bisphenol A tar, and (e) a latent acid curing catalyst. The foundry mixes are used to prepare foundry shapes. They are cured in the presence of the latent acid curing catalyst by heating at an elevated temperature.

REFERENCES:
patent: 3216075 (1965-11-01), Brown
patent: 4317763 (1982-03-01), Menting
patent: 4350800 (1982-09-01), Hesse et al.
patent: 4366267 (1982-12-01), Everett
patent: 4381813 (1983-05-01), Kottke
patent: 4383098 (1983-05-01), Menting
patent: 4451577 (1984-05-01), Coss
patent: 4543373 (1985-09-01), Krawiec et al.
patent: 4543374 (1985-09-01), Menting

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