Carbodiimide-modified polymethylene polyphenylene polyisocyanate

Details Carbodiimide-modified polymethylene polyphenylene polyisocyanate Carbodiimide-modified polymethylene polyphenylene polyisocyanate

1981-12-24

1984-01-03

Torrence, Dolph H.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521124, 521125, 521128, 521129, 521160, 521162, 521901, 521902, 260453AM, C08G 1814, C08G 1878

Patent

active

044242883

ABSTRACT:
Liquid carbodiimide-modified organic polyisocyanates are prepared by reacting a crude polymethylene polyphenylene polyisocyanate containing no more than 70 weight percent diphenylmethane diisocyanate with an isomer mixture of 40 to 100 weight percent 4,4'-, 0 to 50 weight percent 2,4- and 0 to 10 weight percent 2,2'-diphenylmethane diisocyanate and having an average functionality of 2.1 to 2.7 and a free NCO content of at least 30 percent weight percent in the presence of an effective amount of carbodimidization catalyst. Polyisocyanurate-polyurethane foams prepared by reacting the modified polyisocyanates and polyols selected from the group consisting of diethylene glycol and ethylene oxide adducts of trimethylolpropane, trimethylolethane, glycerine, pentaerythritol, .alpha.-methylglucoside, sucrose, toluene diamine and methylene dianiline in the presence of trimerization catalysts exhibit improved compression strengths and K-factors with low friability and smoke density.

REFERENCES:
patent: 3657161 (1972-04-01), Bernard et al.
patent: 4088665 (1978-05-01), Findeisen et al.
patent: 4120884 (1978-10-01), Woerner et al.
patent: 4143063 (1979-03-01), Alberino et al.
patent: 4228095 (1980-10-01), Narayan

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