Catalyst for polyisocyanurate foams made with alternative blowin

Details Catalyst for polyisocyanurate foams made with alternative blowin Catalyst for polyisocyanurate foams made with alternative blowin

1993-05-18

1994-05-03

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521128, 521129, 521901, C08J 900

Patent

active

053088832

ABSTRACT:
Rigid, closed cell polyisocyanurate foams are prepared by reacting together a polyisocyanate and a polyester polyol or a mixture of a polyester polyol and at least one other isocyanate-reactive compound in the presence of (a) a hydrogen-containing blowing agent or a mixture of a hydrogen-containing blowing agent and at least one co-blowing agent and (b) a catalyst mixture comprising (i) a carboxylate salt of an alkali metal or an alkaline earth metal or mixtures thereof, (ii) a tertiary amine, and (iii) a quaternary ammonium carboxylate salt, wherein the equivalent ratio of carboxylate metal salt: tertiary amine is a value less than about 3:1, and the quaternary ammonium carboxylate salt is present in an amount which enhances the char structure of polyisocyanurate foams made with the catalyst mixture and subjected to flammability char tests.

REFERENCES:
patent: 3954684 (1976-05-01), Farrissey et al.
patent: 4136240 (1979-01-01), Zimmerman et al.
patent: 4426461 (1984-01-01), Smith
patent: 4459334 (1984-07-01), Blanpied et al.
patent: 4710521 (1987-12-01), Soukup et al.
patent: 4760100 (1988-07-01), McDaniel
Ricci, R. L. and Van Der Heijden, B., "Polyurethane & Polyisocyanurate Rigid Boardstock Technologies", Polyurethanes World Congress, Sep. 29-Oct. 2, 1987, pp. 266-269.

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