Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Reexamination Certificate
2011-03-29
2011-03-29
Boykin, Terressa M (Department: 1765)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
C428S379000, C428S458000, C428S534000, C524S100000, C524S116000, C524S117000, C524S119000, C524S403000, C524S413000, C524S440000, C524S604000, C524S605000, C528S271000, C528S272000, C528S279000, C528S294000, C528S295500
Reexamination Certificate
active
07915374
ABSTRACT:
Processes for producing polyethylene terephthalate copolyesters are disclosed, that include the steps of:esterifying a mixture of at least terephthalic acid, from 20 mole percent to 45 mole percent 1,4-cyclohexanedimethanol, and ethylene glycol, optionally in the presence of one or more alkaline earth metals or alkali metals, to form an oligomer;polycondensing the oligomer in the melt phase in the presence of aluminum and one or more alkaline earth metals or alkali metals, to obtain a copolyester having an intrinsic viscosity of at least 0.5 dL/g; andthereafter adding to the copolyester a phosphorus-containing compound.
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Armentrout Rodney Scott
Carico, Jr. Douglas Weldon
Carman, Jr. Howard Smith
Connell Gary Wayne
Jenkins Jason Christopher
Boykin Terressa M
Carrier Michael K.
Eastman Chemical Company
Graves, Jr. Bernard J.
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