Mixed blocked isocyanate prepolymers, a process for their...

Details Mixed blocked isocyanate prepolymers, a process for their... Mixed blocked isocyanate prepolymers, a process for their...

C - Chemistry, Metallurgy

08

G

C08G 18/80 (2006.01) C08G 18/10 (2006.01) C08L 63/00 (2006.01) C08L 75/08 (2006.01)

Patent

CA 2152149

Isocyanate prepolymers based on an aromatic diisocyanate and a polyether polyol in which at least 95% of the isocyanate groups are blocked by blocking agents selected from A) about 50 to about 97 equivalent % of a phenol or substituted phenol, B) about 30 to about 50 equivalent % of a pyrazole or a substituted pyrazole and C) 0 to about 10 equivalent % of a blocking agent different from A) and B). These blocked isocyanate prepolymers are particularly useful for the production of flexible epoxy resin systems.

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