Method for producing rigid foams and products produced therefrom

Details Method for producing rigid foams and products produced therefrom Method for producing rigid foams and products produced therefrom

1991-06-25

1993-10-12

Kight, III, John

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521129, 521131, 521137, 521155, 521163, 521172, 521174, C08G 1818, C08G 1822, C08J 908

Patent

active

052526259

ABSTRACT:
In a method of producing a thermosetting foam, a first of two foam forming blends ("A Blend") is prepared using polymeric polymethylene polyphenylisocyanate ("PMDI"). A second of two foam forming blends ("B Blend") is prepared by mixing together a polyol; water; a tertiary amine catalyst having at least one ethyl (--CH.sub.2 --CH.sub.2 --) linkage between two heteroatoms, the heteroatoms being chosen from the group consisting of Nitrogen and Oxygen; and, an alkali metal organo-salt catalyst. A first blowing agent is included with one of the two foam forming blends. When the first and second foam forming blends are mixed together, the tertiary amine catalyst quickly initiates a reaction predominately of the polymeric polymethylene polyphenylisocyanate with water (as opposed to a reaction with the polyol). The quick reaction of the PMDI with water causes, prior to a gel point of the foam, both (1) the production of a second blowing agent for forming cells in the blends and for causing expansion in the liquid blends; and (2) sufficient exothermic heat to initiate boiling of the first blowing agent. Relatively large amounts of alkali metal organo-salt catalyst induce rapid vaporizing of the first blowing agent due to a high level of exothermic heat, whereby expansion of the mixed blends is substantially completed prior to the effective conversion of the mixed liquid blends to a solid. According to the method, a degree of completion of expansion of the foam at any point in time exceeds a degree of completion of chemical reactions of the foam. In another mode of the invention, a frothing agent is also employed.

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N. Malwitz, P. A. Manis, S.-W. Wong and K. C. Frisch, "Amine Catalysis of Polyurethane Foams" 30th Annual Polyurethane Conference, Oct. 15-17, 1986, pp. 338-353.

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