Preparation of urethane prepolymers having low levels of residua

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

1991-07-09

1993-04-13

Manoharan, Virginia

Distillation: processes, separatory

Convective distillation with normally gaseous medium, e.g., air

159 62, 159 161, 159 49, 159DIG10, 203 89, 560352, B01D 100, B01D 300

Patent

active

052020010

ABSTRACT:
A wiped film evaporation process for reducing the amount of residual organic polyisocyanate, especially 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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Kirk-Othmer Encyclopedia of Chemical Technology, Third Edition vol. 9 Enamels, Porcelain or Vitreous B Ferrites pp. 478-481.

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