Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1992-03-20
1993-03-16
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528272, C08G 6378, C08G 6302
Patent
active
051945738
ABSTRACT:
Process for discontinuous production of polyesters by esterification of terephthalic acid with a definite excess of 1,4-bis(hydroxymethyl)cyclohexane in the presence of a titanium catalyst at 180.degree. to 300.degree. C. and 0.8 to 1.5 bar up to a conversion of 98.0% to 99.6%, then precondensation with the addition of more titanium catalyst at 270.degree. to 300.degree. C. and 500 to 5 mbar up to a conversion of 99.5% to 99.9% and polycondensation at 295.degree. to 310.degree. C. and less than 1.5 mbar up to a conversion corresponding to 40% to 95% of the maximum possible viscosity.
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Schmidt Wolfgang
Thiele Ulrich
Kight III John
Mosley T.
Zimmer Aktiengesellschaft
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