Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Metal – metal oxide or metal hydroxide
Reexamination Certificate
2008-03-24
2010-11-16
Boykin, Terressa M (Department: 1796)
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Metal, metal oxide or metal hydroxide
C528S176000, C528S271000, C528S272000, C528S279000
Reexamination Certificate
active
07833931
ABSTRACT:
The present invention relates to a solid acid catalyst for the production of polyester which enables the production of a metal-free polyester resin containing no residual catalyst, exhibits favorable utility efficiency in the production, exhibits extremely high selectivity for the polyesterification reaction with the amount of by-products being below the limit of detection, and is able to be isolated, recovered and reused. In other words, the present invention relates to a solid acid catalyst for the production of polyester, obtained by supporting a metal oxide (B) on a support (A) formed from a metal oxide, wherein said support (A) formed from a metal oxide is a zirconia, said metal oxide (B) is a molybdenum oxide, and a Hammett acidity function (H0) for said catalyst is within a range from −3 to −9, and also relates to a process for producing the solid acid catalyst and a process for producing a polyester that uses the catalyst.
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International Search Report mailed May 20, 2008, issued on PCT/JP2008/055397.
Oki Hironobu
Shiraishi Kouji
Boykin Terressa M
DIC Corporation
Edwards Angell Palmer & & Dodge LLP
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