Stabilization of polycondensates of polyethylene terephthalate

Details Stabilization of polycondensates of polyethylene terephthalate Stabilization of polycondensates of polyethylene terephthalate

1977-06-02

1978-09-19

Phynes, Lucille M.

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

Synthetic resins

From carboxylic acid or derivative thereof

260 457P, 528275, 528286, 528309, C08G 6334, C08G 6332

Patent

active

041153715

ABSTRACT:
A process for the production of high molecular weight low color polyethylene terephthalates using a particulaarly effective polycondensation catalyst is disclosed. Titanium tetrabutylate is added to the reaction mixture after the initial esterification or transesterification reaction is about 95% complete and the polycondensation is completed at temperatures between about 200 and 270.degree. C under reduced pressure. Metaphosphoric acid or its alkali or alkaline earth metal salts are added with the titanium tertrabutylate to control the color. Commonly accepted catalysts may be employed for the initial esterification or transesterification. Polymers with intrinsic viscosities in excess of 0.7 dl/g and yellowness numbers less than 6 can be produced.

REFERENCES:
patent: 2822348 (1958-02-01), Haslam
patent: 2938015 (1960-05-01), Gormley
patent: 3028366 (1962-04-01), Engle et al.
patent: 3036043 (1962-05-01), Gruschke et al.
patent: 3047515 (1962-07-01), Piirma

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