Polyisocyanate compositions and their use

Details Polyisocyanate compositions and their use Polyisocyanate compositions and their use

2005-04-26

2005-04-26

Stoner, Kiley S. (Department: 1725)

Metal founding

Process

Shaping a forming surface

C164S528000, C164S529000, C523S143000, C523S139000

Reexamination Certificate

active

06883587

ABSTRACT:
This invention relates to polyisocyanate compositions comprising (a) polyisocyanate, and (b) a monomeric carbodiimide. The polyisocyanate compositions are particularly useful in phenolic urethane foundry binder systems. The invention also relates to foundry mixes prepared with (a) a phenolic urethane binder containing the polyisocyanate composition, and (b) a foundry aggregate, as well as foundry shapes prepared by the no-bake and cold-box processes, which are used to make metal castings.

REFERENCES:
patent: 4294719 (1981-10-01), Wagner et al.
patent: 4332716 (1982-06-01), Shah
patent: 4612054 (1986-09-01), Hamon
patent: 5733959 (1998-03-01), Heitz et al.
patent: 6143702 (2000-11-01), Nadasdi
patent: 6288139 (2001-09-01), Skoglund
“2-Chloro-1,3-dimethylimidazolinium chloride. 1. A Powerful Dehydrating Equivalent to DCC” by Toshio Isobe. J. Org. Chem 1999, 64, 6984-6988.

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