Preparation of urethane prepolymers having low levels of...

Details Preparation of urethane prepolymers having low levels of... Preparation of urethane prepolymers having low levels of...

C - Chemistry, Metallurgy

08

G

202/80

C08G 18/10 (2006.01) C07C 269/08 (2006.01) C08G 18/76 (2006.01)

Patent

CA 2025691

A wiped film evaporation process for reducing the amount of residual toluene diisocyanate in a polyurethane prepolymer reaction product mixture. An inert sweeping gas is added to the evaporation process, preferably after first passing through a holdup volume of the prepolymer which has passed through the evaporation zone.

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