Method for reducing hydrolyzable chloride in toluene diisocyanat

Details Method for reducing hydrolyzable chloride in toluene diisocyanat Method for reducing hydrolyzable chloride in toluene diisocyanat

1991-01-28

1993-02-09

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

25218220, 25218221, 528 67, 560352, C08G 1870

Patent

active

051853841

ABSTRACT:
Disclosed is a method for reducing hydrolyzable chloride in toluene diisocyanate (TDI) and, particularly, in TDI distillation bottoms, and polymers produced using the reduced hydrolyzable chloride bottoms. Crude TDI is heated, optionally in the presence of a solvent, to cause: (a) partial reflux, (b) partial reflux and fractionation, or (c) complete reflux and fractionation; under conditions sufficient to reduce hydrolyzable chloride. After distilling the crude TDI to form TDI monomer, the bottoms produced are thereby desirably reactive and viscosity-stable over a significant period of time. The treated bottoms can be reacted with compounds containing active hydrogen containing groups to form polyurethane, polyurea, and polyisocyanurate polymers, particularly foams.

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