Process for preparing polyesters

Details Process for preparing polyesters Process for preparing polyesters

1976-01-09

1977-11-15

Phynes, Lucille M.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 75R, 560 76, C08G 6322

Patent

active

040585077

ABSTRACT:
A process for preparing a polyester which comprises reacting a di-lower alkyl ester of a difunctional carboxylic acid at least 90 mole% of which consists of terephthalic acid with a polymethylene glycol containing 2 to 10 carbon atoms at least 90 mole% of which consists of ethylene glycol in the presence of an ester-interchange reaction catalyst to form an ester-interchange reaction product, and then polycondensing it in the presence of a polycondensation catalyst, wherein a substantially uniform solution in ethylene glycol of (A) 20 to 150 millimole%, based on said di-lower alkyl ester of the difunctional carboxylic acid, of calcium acetate and (B) 2 to 25 millimole%, based on said di-lower alkyl ester, of cobalt acetate is used as the ester-interchange reaction catalyst.

REFERENCES:
patent: 3171828 (1965-03-01), Isaacs et al.
patent: 3321444 (1967-05-01), Hoyer et al.
patent: 3385830 (1968-05-01), VOM Orde et al.
patent: 3391122 (1968-07-01), Bice et al.
patent: 3420801 (1969-01-01), Fitz
patent: 3489722 (1970-01-01), Kotani et al.
patent: 3962189 (1976-06-01), Russin et al.

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