Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Reexamination Certificate
2011-04-26
2011-04-26
Boykin, Terressa M (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
C264S176100, C264S219000, C422S131000, C482S071000, C482S071000, C502S150000, C528S271000
Reexamination Certificate
active
07932345
ABSTRACT:
A polyester polymer composition containing polyester polymers such as polymers having repeating ethylene terephthalate units, aluminum atoms in an amount of at least 3 ppm based on the weight of the polymer, the polyester polymers having an It.V. of at least 0.72 dL/g obtained through a melt phase polymerization and a residual acetaldehyde level of 10 ppm or less. Also provided are polyester polymer compositions containing polyester polymers and:(i) aluminum atoms(ii) alkaline earth metal atoms or alkali metal atoms or alkali compound residues, and(iii) a catalyst deactivator such as a phosphorus compound. The phosphorus compound is added to the polyester melt either late in the polycondensation or upon remelting a solid polyester polymer. The polyester polymer exhibits good L* brightness, clarity, and low levels of acetaldehyde generated upon melting.
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patent:
Armentrout Rodney Scott
DeBruin Bruce Roger
Jernigan Mary Therese
Venett Kenrick
Boykin Terressa M
Grupo Petrotemex, S.A. de C.V.
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
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