Liquid carbodiimide-uretonimine modified polymethylene polypheny

Details Liquid carbodiimide-uretonimine modified polymethylene polypheny Liquid carbodiimide-uretonimine modified polymethylene polypheny

1987-09-14

1988-05-10

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

25218222, 25218221, 548952, C08G 1814

Patent

active

047436263

ABSTRACT:
A process for the preparation of liquid polymethylene polyphenylene polyisocyanate blends containing carbodiimide-uretonimine isocyanate linkages, containing a high two-ring methylene bis(phenylisocyanate) content, and light colored polyurethane foams made therefrom. The process is comprised of reacting polymethylene polyphenylene polyisocyanate with a catalytically effective amount of a carbodiimide-uretonimine promoting compound at a temperature sufficient to promote the formation of carbodiimide-uretonimine linkages and an isocyanate content of about 25 percent and the desired viscosity is reached, and then reacting that product to deactivate the carbodiimide-uretonimine catalyst, and finally blending two ring methylene bis(phenylisocyanate) with the product to produce a mixture having a two ring isocyanate content of about 60 percent of the total ring content and a viscosity comparable to standard polymeric MDI. Urethane foams made from this material are lighter in color than those formed from standard polymeric MDI.

REFERENCES:
patent: 3891578 (1975-06-01), Kan et al.
patent: 4284730 (1981-08-01), Nanayan et al.
patent: 4424288 (1984-01-01), Patton et al.

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