Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1984-01-30
1985-02-26
Phynes, Lucille M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528274, 528277, 528278, 528280, 528281, 528283, 528285, C08G 6304, C08G 6338
Patent
active
045018782
ABSTRACT:
Disclosed is an improved process for the preparation of high molecular weight linear polyesters. In the preparation of polyesters by formation of a bis-dihydroxy ester prepolymer by transesterifying dimethyl terephthalate with a glycol in the presence of a catalyst followed by polycondensing the prepolymer in the presence of certain phosphorous-containing compounds and a transition metal-containing catalyst which remains active in the presence of said phosphorous compound, an improved rate of polycondensation is achieved by introducing the phosphorous compounds after first polycondensing the prepolymer to a low molecular weight linear polyester having an average degree of polymerization of about 2 to about 10. The improved process further requires that the catalyst employed in the formation of the prepolymer be substantially inactive in the presence of said phosphorous compounds.
REFERENCES:
patent: 3998793 (1976-12-01), Gey et al.
patent: 4101526 (1978-07-01), Buxbaum
patent: 4208527 (1980-06-01), Horlbeck et al.
patent: 4328059 (1982-05-01), Horlbeck et al.
Bailey Gary C.
Eastman Kodak Company
Phynes Lucille M.
Reece III Daniel B.
Tootle Clyde L.
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