Catalyst for production of polyester, process for producing...

Details Catalyst for production of polyester, process for producing... Catalyst for production of polyester, process for producing...

2008-01-29

2008-01-29

Boykin, Terressa (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

C501S150000, C528S271000

Reexamination Certificate

active

11291975

ABSTRACT:
To provide a catalyst for production of a polyester, a process for producing a polyester using the catalyst and a titanium-containing polyethylene terephthalate having excellent characteristics.A catalyst for production of a polyester, characterized by comprising at least (1) a Group 4A compound (hereinafter referred to as compound (1)), (2) a compound of at least one element selected from the group consisting of magnesium, calcium and zinc (hereinafter referred to as compound (2)) and an oxygen-containing organic solvent. A process for producing a polyester using this catalyst. A titanium-containing polyethylene terephthalate, having characteristics represented by the following (A), (B) and (C):(A) titanium K absorption edge: the peak intensity ratio R defined by R=A/B exceeds 0.2, where A is the intensity of a peak having the maximum intensity among K absorption pre-edge peaks, and B is the maximum peak intensity of K absorption post-edge peaks in a XANES spectrum obtained by normalizing a XAFS spectrum;(B) the amount of carboxyl end groups is less than 35 eq/ton; and(C) the intrinsic viscosity is at least 0.5 dl/g.

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