Polymeric MDI color reduction

Details Polymeric MDI color reduction Polymeric MDI color reduction

1999-03-23

2000-10-03

Niland, Patrick D.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

524589, 524590, 528 44, 528 48, 528 73, 560331, 560336, 560340, C08J 300, C08K 515, C08L 7500, C07C24900, C07C25100

Patent

active

061274631

ABSTRACT:
The present invention relates to an improved process for the production of light colored polymethylene polyphenyl polyisocyanates. This process comprises adding a compound that contains an epoxide group to the process at any point prior to quench cooling the formed polyisocyanates.

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