Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Patent
1993-12-15
1995-05-23
Acquah, Samuel A.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
528272, 528277, 528283, 528287, 5283083, 5283086, 524706, 524779, 524401, 524414, 524440, 428 347, 428 357, 428221, 428364, 2641761, 26417714, 2642091, B29C 4700, C08G 6382
Patent
active
054179084
ABSTRACT:
Process for making a polyester having polyethylene terephthalate units including transesterifying a terephthalic acid ester with a glycol using a manganese salt as catalyst and then subjecting the product to a polycondensation reaction using a germanium-containing catalyst to form a polyester; adding phosphorous compounds to block 80 to 99% by weight of the active manganese salt thus leaving an unblocked portion of the manganese salt prior to the polycondensation; and adding 10 to 100 ppm of Ge at the end of a ethylene glycol stage of the polymerization so that the Ge and the unblocked portion of the manganese salts provide the germanium-containing catalyst for the polycondensation reaction. The P/Mn molar ratio being less than 1. The reaction mixture contains 10 to 100 ppm of manganese during the reaction.
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Enggasser Josiane
Gesche Paul
Stahlin Roland
Acquah Samuel A.
Rhone-Poulenc Viscosuisse SA
Striker Michael J.
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