Curing liquid polyurethane prepolymers

Details Curing liquid polyurethane prepolymers Curing liquid polyurethane prepolymers

1973-11-29

1976-08-17

Ivy, C. Warren

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 25AL, 260 25AT, 260 25BE, 260 28R, 260 336UB, 260 37N, 260859R, C08J 902

Patent

active

039753166

ABSTRACT:
Liquid isocyanate-terminated polyurethane prepolymers are cured by mixing them with about 5% to 200% by weight, preferably 10% to 100% by weight, based on the weight of prepolymer, of an aqueous colloidal dispersion selected from aqueous alkali metal silicates containing from about 20% to 60% solids and aqueous magnesium oxide containing from about 5% to 40% solids. The water associated with the aqueous dispersion is bound in the cured product and thus the dispersions act as both curing agents and low cost extenders. The cured materials may be non-porous elastomeric products or finely cellular products. Some of the cellular products are rigid and suitable for, e.g., structural applications. Both types of products have good flame retardant properties.

REFERENCES:
patent: 2726219 (1955-12-01), Hill
patent: 3004921 (1961-10-01), Stossel
patent: 3150109 (1964-09-01), Ferrigno
patent: 3395108 (1968-07-01), Cobbledick
patent: 3419533 (1968-12-01), Dieterich
patent: 3441523 (1969-04-01), Dwyer et al.
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patent: 3634342 (1972-01-01), Boblitt
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patent: 3781231 (1973-12-01), Janssen
patent: 3793241 (1974-02-01), Kyle
"Polyurethanes Chemistry and Technology, Part II Technology," Saunders et al., Interscience; N.Y., 1964; pp. 7-10, 201-202, 300-306.

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