Phosphine oxide hydroxyaryl mixtures with novolac resins for...

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...

Reexamination Certificate

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C252S609000, C525S480000, C525S523000, C528S398000, C549S219000, C568S017000

Reexamination Certificate

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06887950

ABSTRACT:
A mixture of hydroxyarylphosphine oxides comprising (a) a mono(hydroxyaryl)phosphine oxide, (b) a bis(hydroxyaryl)phosphine oxide, (c) a tris((hydroxyaryl)phosphine oxide, and, optionally (d) a tri- aryl, alkyl, or aralkyl-substituted phosphine oxide combined with a phenolic co-crosslinking composition is useful as a polyhtdroxy mixture for co-crosslinking an epoxy resin which also imparts flame resistance.

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