Process of making U.V. cured polyurethanes using diazonium salt promoters
AssigneePhillips Petroleum Company
InventorMerlin R. Lindstrom
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Abstract
A process for the rapid curing of polyurethanes comprising the steps of (a) mixing together a diisocyanate compound, a diol, a polyol, and a diazonium salt and thereafter (b) exposing the resulting mixture to ultraviolet light in the wavelength range of about 2000 to about 4000 Angstroms for a period of about 0.1 second to about 20 minutes at a temperature in the range of about 0.degree. F. to about 180.degree. F.
Claims6
In a process for the production of polyurethane compounds by the polymerization reaction of a diisocyanate compound of the formula OCN--R--NCO wherein R is a C.sub.4 to C.sub.20 alkylene, arylene, alkarylene or aralkylene radical with at least one diol and at least one polyol, the improvement which comprises admixing with said diisocyanate compound and said diol and polyol as a catalyst for said polymerization reaction at least one diazonium salt compound of the formula ##STR2## wherein R' is any electron withdrawing group, M is one selected from the group consisting of B, P, As, Sb, Bi and Sn, n is 4, 5 or 6, and x is 1, 2 or 3;
- and thereafter subjecting the resulting reaction mass to ultraviolet light in the wavelength range of about 2000 to about 4000 Angstroms for a period of about 0.1 to 20 minutes at a temperature in the range of about 0.degree. F. to about 180.degree. F.
Dependencies are inferred from the claim text.