Compositions – Electrically conductive or emissive compositions – Metal compound containing
Patent
1992-02-20
1993-10-19
Lieberman, Paul
Compositions
Electrically conductive or emissive compositions
Metal compound containing
252500, 528308, 5283086, 5283087, 5283088, 528272, 528275, 528280, H01B 100, H01B 120, H01B 122, C08G 63692
Patent
active
052542882
ABSTRACT:
A continuous direct esterification and polycondensation process is disclosed in view of the production of polyester comprising units of ethylene terephthalate as the major repeating units, said polyester being substantially improved in particular in respect of its electroconductive properties. Said process comprises supplying terephtalic acid and ethylene glycol to bis(betahydroxy ethyl) terephthalate or its oligomer so as to carry out esterification, followed by polycondensing the resulting oligomer under increasingly reduced pressure, and wherein a solution in ethylene glycol of an electroconductivity enhancing additive, preferably a metallic salt, such as e.g. magnesium acetate, is added to the oligomer reaction mixture when the esterification rate has reached at least 80% and characterized in that said ethylene glycol solution is added to the oligomer reaction mixture in such manner that escape of the added ethylene glycol out of the said oligomer reaction mixture is prohibited.
REFERENCES:
patent: 4110316 (1978-08-01), Edging et al.
patent: 5185426 (1993-02-01), Verheijen et al.
De Saedeleer Roger I.
Hellemans Ludovicus M.
Marien August M.
Van Hove Jan H.
Verheijen Johannes M.
Agfa-Gevaert N.V.
Lieberman Paul
Tierney M.
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