Carbodiimide-modified polymethylene polyphenylene...

Details Carbodiimide-modified polymethylene polyphenylene... Carbodiimide-modified polymethylene polyphenylene...

C - Chemistry, Metallurgy

07

D

260/335, 403/45,

C07D 229/00 (2006.01) C08G 18/48 (2006.01) C08G 18/78 (2006.01) C08G 18/79 (2006.01)

Patent

CA 1270841

CARBODIIMIDE-MODIFIED POLYMETHYLENE POLYPHENYLENE POLYISOCYANATES FOR USE IN THE PREPARATION OF POLYISOCYANURATE-POLYURETHANE FOAMS Abstract of the Disclosure Liquid carbodiimide-moaified organic polyisocy- anates 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 carbod- imidization catalyst. Polyisocyanurate-polyurethane foams prepared by reacting the modified polyisocyanates and polyols selected from the group consisting of diethylene glycol and ethylene oxide adaucts of trlmethylolpropane, trimethylolethane, glycerine, pentaerythritol, .alpha.-methyl- glucoside, sucrose, toluene diamine ana methylene dianiline in the presence of trimerization catalysts exhibit improved compression strengths and K-factors with low friability and smoke density.

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