Molding compositions or masses suitable for manufacturing foundr

Details Molding compositions or masses suitable for manufacturing foundr Molding compositions or masses suitable for manufacturing foundr

1975-08-15

1978-02-28

Person, Sandra M.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 64, 260DIG40, C08K 336, C08G 602, C08G 1828

Patent

active

040766837

ABSTRACT:
Molding compositions or masses comprising sand and a two-component binder system are prepared. These two-component binders consist essentially of 1) polyisocyanate and 2) a low molecular weight polymethylol produced by the controlled condensation of narrow mole ratios of acetone and formaldehyde under alkaline reaction conditions followed by acidification and removal of sufficient water to produce a minimum solid content of at least 95%. These molding compositions cure so fast that they may be taken off the mold five minutes after having been cured with an amine curing agent, and reach a substantial bending strength within minutes of curing compared to prior art compositions which achieve comparable bending strength only after a period of as long as one hour.

REFERENCES:
patent: 2674591 (1954-04-01), White et al.
patent: 2711971 (1955-06-01), Miller et al.
patent: 3428110 (1969-02-01), Walker et al.
patent: 3676392 (1972-07-01), Robins
patent: 3806491 (1974-04-01), Gardikes et al.

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