Process for the production of foundry cores and molds

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

1975-08-07

1978-02-07

Person, Sandra M.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 38, 260DIG40, 164 43, 264239, 264240, 264219, C08K 334, B22C 122, B29C 102

Patent

active

040726495

ABSTRACT:
Foundry cores and molds are produced from foundry sand and/or other inert fillers, polyhydroxyl compounds, polyisocyanates and tertiary amine catalysts. The precatalyzed mixtures can be stored for long periods of time without any adverse effects on the subsequent processing or core properties when at least 80% by weight of the polyisocyanate used is of the diphenyl alkane series in which the isocyanate groups are sterically hindered solely by substituents in at least one ortho position.

REFERENCES:
patent: 3180883 (1965-04-01), Case
patent: 3403721 (1968-10-01), Robins et al.
patent: 3428110 (1969-02-01), Walker et al.
patent: 3499861 (1970-03-01), Kujawa et al.
patent: 3676392 (1972-07-01), Robins
B. A. Dombrow, Polyurethanes, 2nd edition (1965) pp. 26 & 27.

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