C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
400/100, 402/157
C08G 18/10 (2006.01) C08G 18/08 (2006.01) C08L 75/04 (2006.01)
Patent
CA 1119347
METHODS OF FORMING POLYURETHANE PREPOLYMERS AND THE RESULTING PREPOLYMERS ABSTRACT OF THE DISCLOSURE methods of forming liquid, low viscosity, low molecular weight, cross-linkable, stable polyurethane prepolymers which comprise: reacting polyisocyanates, and preferably aliphatic and cyclo- aliphatic diisocyanates, with polyhydroxy compounds or polyols, and preferably diols, triols, tetrols, and mixtures thereof: the polyols having a molecular weight of from about 62 to about 3000: the polyisocyanates and the polyols being added to the reaction mixture in an NCO/OH ratio in the range of from about 0.7:1 to about 6:1, and preferably from about 1.6.1 to about 4:15 the reaction taking place preferably in an inert, non- reactive organic solvent such as xylene; in the absence of any reaction catalysts, or in the presence of a relatively very low concentration of reaction catalysts of from about 0.00005% by weight to about 0.8% by weight, based on the total weight of the reaction mixture: at a reaction temperature of from about 0° C. to about 70° C., and preferably from about 0° C. to about 40° C., for a reaction time of from about 1/2 hour to about 12 hours: and terminating the reaction short of completion at a percent completion of reaction of from about 2% to about 95%, and preferably from about 30% to about 80%. The resulting liquid, low viscosity, low molecular weight, cross-linkable, stable polyurethane prepolymers are also included in the in- ventive concept.
277252
Conger Robert P.
Pogozelski Vincent F.
Congoleum Corporation
Macrae & Co.
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