Liquid methylene diphenyl diisocyanate

Details Liquid methylene diphenyl diisocyanate Liquid methylene diphenyl diisocyanate

1993-09-02

1994-06-07

Welsh, Maurice J.

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

053190548

ABSTRACT:
The present invention relates to a process for the production of a allophanate-modified MDI which is a storage stable liquid at 25.degree. C. comprising (A) reacting (i) one equivalent of a diisocyanate and (ii) one equivalent of an aliphatic alcohol containing from 1 to about 36 carbon atoms or aromatic alcohol containing from 6 to 18 carbon atoms to form a diurethane of the diisocyanate, (B) reacting the product of (A) with 4,4'-diphenylmethane diisocyanate containing from 2 to 60% by weight 2,4'-MDI and less than 6% by weight of the 2,2'-MDI, in an amount sufficient to provide an allophanate having an isocyanate group content of about 12.0 to 30.0%.

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patent: 4160080 (1979-07-01), Koenig et al.
patent: 4261852 (1981-04-01), Carroll et al.
patent: 4490300 (1984-12-01), Allen et al.
patent: 4738991 (1988-04-01), Narayan
patent: 4866103 (1989-09-01), Cassidy et al.
patent: 4910333 (1990-03-01), Slack

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