Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Reexamination Certificate
2005-09-16
2010-02-02
Boykin, Terressa M (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
C206S096000, C206S139000, C502S150000, C502S208000, C528S271000, C528S280000, C528S281000, C528S282000, C528S284000
Reexamination Certificate
active
07655746
ABSTRACT:
Polyesters whose polycondensation is catalyzed by titanium-containing catalysts and which are susceptible to acetaldehyde formation during polycondensation or subsequent molding operations are prepared with low finished acetaldehyde content and reduced acetaldehyde generation by adding an ammonium or amine salt of an oxyphosphorus-acid. Polyesters, especially polyethylene terephthalate, may be produced with high inherent viscosity in reduced processing time, without the necessity of further polymerization in the solid state.
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Boykin Terressa M
Carrier Michael K.
Eastman Chemical Company
Graves, Jr. Bernard J.
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