Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Reexamination Certificate
2006-04-11
2006-04-11
Acquah, Samuel A. (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
C528S281000, C528S282000, C528S308000, C528S308600, C524S779000, C524S783000, C524S786000, C524S788000, C524S404000, C524S430000, C524S432000, C524S433000
Reexamination Certificate
active
07026434
ABSTRACT:
A composition and a process for producing the composition are disclosed. The composition comprises (1) repeat units derived from a carbonyl compound and a glycol and (2) one or more ultrafine metal oxides. The process can comprise (1) contacting, in the presence of a catalyst and optionally one or more ultrafine metal oxides, a carbonyl compound such as dicarboxylic acid with a glycol under a condition sufficient to produce polyester wherein the glycol can be pretreated with a metal oxide or (2) incorporating an ultrafine metal oxide into or onto polyester. Also disclosed is a process for substantially removing, or reducing the content of, an aldehyde in a glycol which comprises contacting the glycol with at least one metal oxide.
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patent: 6113997 (2000-09-01), Massey et al.
patent: 6346070 (2002-01-01), Ohmatsuzawa et al.
patent: 10182805 (1998-07-01), None
patent: WO 0130900 (2001-05-01), None
Acquah Samuel A.
E.I. du Pont de Nemours and Company
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