Process for the preparation of polymethylene polyphenyl polyisoc

Details Process for the preparation of polymethylene polyphenyl polyisoc Process for the preparation of polymethylene polyphenyl polyisoc

1980-12-01

1983-04-26

Cockeram, H. S.

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

Organic compounds

Carboxylic acid esters

252182, 260453P, 528 67, C07C12506, C07C 6900, C08G 1876

Patent

active

043814050

ABSTRACT:
A polymethylene polyphenyl polyisocyanate composition comprising polymethylene polyphenyl polyisocyanates, a part of the isocyanate groups contained therein being substituted by a carbamate group, or said polymethylene polyphenyl polyisocyanates having the substituted carbamate group and polymethylene polyphenyl polyisocyanate not having carbamate group. The total amount of the carbamate groups contained in the composition is up to 10 percent by mole based on the total amount of isocyanate groups contained in the composition. The composition is useful for the preparation of rigid polyurethane which has many industrial applications. A process for the preparation of the composition is also disclosed.

REFERENCES:
patent: 3476933 (1969-11-01), Mendelsohn
patent: 4162362 (1979-07-01), Shawl

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