C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 275/60 (2006.01) C08G 18/10 (2006.01) C08G 18/77 (2006.01) C08G 18/78 (2006.01) C08G 18/80 (2006.01)
Patent
CA 2188237
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°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.
Adkins Rick L.
Slack William E.
Corporation Bayer
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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