Catalyst and process for preparing low-viscosity and...

Details Catalyst and process for preparing low-viscosity and... Catalyst and process for preparing low-viscosity and...

2006-02-21

2006-02-21

Gorr, Rachel (Department: 1711)

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

Synthetic resins

From reactant having at least one -n=c=x group as well as...

C564S282000, C564S289000, C544S193000, C544S222000

Reexamination Certificate

active

07001973

ABSTRACT:
A low-viscosity polyisocyanate of reduced color, containing isocyanurate groups is prepared by partially trimerizing an aliphatic and/or cycloaliphatic diisocyanate in the presence of 0.02 to 2% weight, based on the weight of the diisocyanate starting material, of at least one trimerization catalyst containing a quarternary amine component and then removing excess diisocyanate from the reaction medium.

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