Color stability of isocyanates

Details Color stability of isocyanates Color stability of isocyanates

2007-11-20

2007-11-20

Niland, Patrick (Department: 1714)

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

C252S397000, C252S400240, C252S404000, C252S405000, C524S589000, C524S590000, C524S147000, C524S153000, C560S331000, C560S333000

Reexamination Certificate

active

10890970

ABSTRACT:
A hardener composition for use as a component of a two component polyurethane coating composition, comprising a polyisocyanate, a catalyst for promoting reaction of the polyisocyanate with a reactive hydrogen compound, and one or more antioxidants selected from: a first antioxidant comprising one or more of sterically hindered phenol antioxidants and secondary aryl amine antioxidants, and a second antioxidant comprising one or more organophosphite antioxidant, exhibits improved color stability.

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Page 2440 of VI—Formulation of Polyurethanes re Solvent retention and Catalysts.
Pages 80 and 81 of III—Isocyanate Chemistry.

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