Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1974-11-01
1976-10-26
Phynes, Lucille M.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 40R, 260860, C08G 6322
Patent
active
039883019
ABSTRACT:
A reaction mixture comprising terephthalic acid and bis(2-hydroxyethyl) terephthalate in a molar ratio of from 1:1 to 1.1:1, and ethylene glycol in a molar ration of from 0.3:1 to 0.9:1 with respect to the terephthalic acid, is heated at a temperature between 240.degree. and 310.degree. C and in an inert atmosphere to produce a precondensate consisting of a low molecular weight esterification product. A first part of the precondensate thus formed is then polycondensed further at a temperature of from 260.degree. to 300.degree. C at subatmospheric pressure to form a high molecular weight linear polyethylene terephthalate, and a second part is pre-glycolised with ethylene glycol to bis(2-hydroxyethyl) terephthalate, which is processed in like manner to the first, and so on in a continuous or batch process.
According to the invention, there is added to the first, second and/or third reaction steps polyethylene terephthalate scrap together with fresh terephthalic acid and/or ethylene glycol in such quantity or quantities as to form a further amount of the reaction mixtures in the specified molar proportions.
REFERENCES:
patent: 3767601 (1973-10-01), Knox
patent: 3849379 (1974-11-01), Jeurissen et al.
De Smedt Frans Antoon
Jeurissen Lambert Gaston
AGFA-GEVAERT N.V.
Breiner A. W.
Phynes Lucille M.
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