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...
Reexamination Certificate
2007-05-15
2007-05-15
Zemel, Irina S. (Department: 1711)
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...
C524S416000, C524S500000, C524S541000, C524S542000
Reexamination Certificate
active
10666573
ABSTRACT:
A fire retardant intumescent coating composition comprises:(a) 30 to 60% by weight of a phosphorous containing material which decomposes to produce phosphoric acid when the coating is exposed to fire;(b) 10 to 30% by weight of a thermosetting binder;(c) 2.5 to 10% by weight of a curing agent for the thermosetting binder; and(d) 5 to 40% by weight of a thermoplastic binder,wherein the active groups of the thermosetting and thermoplastic binders are chosen so as to impart charring and blowing functions to the intumescent coating composition.The thermosetting binder is advantageously a hydroxylated thermosetting binder, suitably an epoxy resin.The thermoplastic binder is advantageously an oxygenated heterocyclic thermoplastic binder, suitably an aldehyde and/or ketone resin.The coating composition may contain 1 to 10% by weight of a colouring agent, suitably titanium dioxide.The coating composition may contain 0.1 to 10% by weight of melt viscosity modifier, suitably hydrogenated castor oil.
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Sinclair Michael John
Watts James Edward
Chance & Hunt Limited
Merriam Andrew E. C.
Rohm and Haas Company
Zemel Irina S.
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