Polyester resins with a special co-catalyst for high melt...

Details Polyester resins with a special co-catalyst for high melt... Polyester resins with a special co-catalyst for high melt...

2006-06-21

2009-11-24

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, C428S034100, C428S035700, C502S150000, C528S271000, C528S272000

Reexamination Certificate

active

07622545

ABSTRACT:
The present invention relates to a PET resin and a process for producing polyethylene terephthalate (PET) resin having conventional catalysts such as antimony, titanium, tin or germanium compounds and a glycol insoluble tungsten compound or tungsten trioxide or tungsten carbide as co-catalyst. The tungsten compound as a co catalyst increases the rates of solid state polymerization and improves the ‘L’ color value.

REFERENCES:
patent: 4064112 (1977-12-01), Rothe et al.
patent: 5241046 (1993-08-01), Shiraki et al.
patent: 7094863 (2006-08-01), Moore et al.
patent: 2005/0203267 (2005-09-01), Jernigan et al.
patent: WO 2004104080 (2004-12-01), None

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