Production of urethane foams and laminates thereof

Details Production of urethane foams and laminates thereof Production of urethane foams and laminates thereof

1974-08-19

1976-01-20

Whitby, Edward G.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156246, 260 25AE, 260 25AY, 264DIG5, 428320, 428423, B32B 520, B32B 518

Patent

active

039335488

ABSTRACT:
Thin flexible urethane foam film layers are produced by spreading a layer of polyurethane reactants over a carrier sheet at a uniform layer thickness. The polyurethane reactants consist essentially of an isocyanate and a hydroxyl terminated polyol having an inorganic carbon dioxide producing blowing agent incorporated therein and being free of water. The unconfined film layer is then heated to a temperature in the range of from 260.degree.F to 390.degree.F to cause gellation and release of the carbon dioxide in the mixture with final formation of a uniform thickness flexible polyurethane foam product.

REFERENCES:
patent: 3256131 (1966-06-01), Koch et al.
patent: 3262827 (1966-07-01), Kallander et al.
patent: 3692708 (1972-09-01), Meisert et al.
patent: 3826764 (1974-07-01), Weber
"Blowing Agents," by Henry R. Lasman, National Pairchemicals, Inc., Wilmington, Mass., Vol. 2, pp. 539-540 relied upon.

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