Liquid 1,3-phenylene diisocyanate, 1,1'-biphenyl diisocyanate an

Details Liquid 1,3-phenylene diisocyanate, 1,1'-biphenyl diisocyanate an Liquid 1,3-phenylene diisocyanate, 1,1'-biphenyl diisocyanate an

1995-12-22

1997-07-15

Gorr, Rachel

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...

2521822, 560 37, 560 25, 560301, 560330, 560345, C08G 1830

Patent

active

056484453

ABSTRACT:
Allophanate-modified 1,3-phenylene diisocyanates or 1,1-biphenyl diisocyanates or 1,1'-oxy-bis-(isocyanato benzenes) which are storage stable liquid at 25.degree. C. are made by reacting the diisocyanate and a mono-alcohol to form an isocyanate containing urethane groups. The urethane groups in the diisocyanate are then converted to allophanate groups. The resultant product which has an isocyanate group content of from about 10 to about 40% may be further reacted with isocyanate-reactive compounds to produce an allophanate-modified diisocyanate prepolymer containing urethane or urea groups having an isocyanate group content of from about 5 to about 40.0%. The liquid, storage-stable, allophanate-modified diisocyanates produced by these processes are particularly useful in the production of elastomers and flexible foams.

REFERENCES:
patent: 3644457 (1972-02-01), Konig et al.
patent: 4160080 (1979-07-01), Koenig et al.
patent: 4738991 (1988-04-01), Narayan
patent: 4866103 (1989-09-01), Cassidy et al.
patent: 5319053 (1994-06-01), Slack et al.
patent: 5319054 (1994-06-01), Slack et al.

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