Prepolymer compositions derived from liquid methylene bis (pheny

Details Prepolymer compositions derived from liquid methylene bis (pheny Prepolymer compositions derived from liquid methylene bis (pheny

1991-03-08

1993-11-23

Siegel, Alan

Organic compounds -- part of the class 532-570 series

Organic compounds

Isocyanate esters

C07C25100

Patent

active

052646203

ABSTRACT:
The present invention is a prepolymer or quasi-prepolymer formed from the reaction of a given amount of a diphenyl methane diisocyanate having at least 5 percent of the 2,4'-isomer and polytetramethylene ether glycols having a molecular weight between 162 and 3000. The glycol which may be combined with other polyether or polyester glycols. The resulting NCO-terminated prepolymer or quasi polymer is a liquid which is stable at temperature of 15.degree. C. for at least 24 hours.

REFERENCES:
patent: 4115429 (1978-09-01), Reiff et al.
patent: 4386032 (1983-05-01), Hughes et al.
patent: 4478960 (1984-10-01), Buethe et al.

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