Liquid methylene diphenyl diisocyanate

Details Liquid methylene diphenyl diisocyanate Liquid methylene diphenyl diisocyanate

1993-09-02

1995-08-08

Schofer, Joseph L.

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

Synthetic resins

From reactant having at least one -n=c=x group as well as...

528 45, 528 49, 528 55, 528 67, 25218222, 560 27, C08G 1872

Patent

active

054400031

ABSTRACT:
Disclosed herein are processes for the production of allophanate-modified diphenylmethane diisocyanate prepolymers and the products produced by the processes which are both stable and liquid at 25.degree. C. by reacting (i) 4,4'-diphenyl-methane diisocyanate containing from 2 to 60% by weight 2,4'-MDI and less than 6% by weight of the 2,2'-MDI with (ii) an aromatic alcohol containing between 6 and 18 carbon atoms such as phenol, with the resulting product being converted to the allophanate having an isocyanate group content of from 12 to 32% by weight.

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patent: 4738991 (1988-04-01), Narayan
patent: 4866103 (1989-09-01), Cassidy et al.
patent: 4910333 (1990-03-01), Slack
patent: 5319054 (1994-06-01), Slack et al.

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