Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1979-04-02
1980-05-27
Phynes, Lucille M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528279, 528280, 528281, 528283, 528284, 528285, 525437, C08G 6318, C08G 6336
Patent
active
042051576
ABSTRACT:
A high molecular weight polyester is disclosed, having a low carboxyl content, and utilizing a low catalyst level, produced by a two-stage process; a melt process until the intrinsic viscosity of the prepolymer reaches about between 0.15 and 0.45 dl/g, and a solid state polymerization in a fluidized bed until the intrinsic viscosity of the polycondensed polymer reaches at least 0.60 dl/g. The melt process employs addition of excess initial glycol, delayed addition of excess glycol, and delayed addition of catalyst, in any combination, to achieve a low carboxyl content polyester prepolymer capable of use in the fluidized bed solid state polymerization. This prepolymer with a minimal carboxyl content achieves a maximum solid state polymerization rate in a fluidized bed. This prepolymer also permits the use of a very low catalyst level to achieve high product purity and still maintains economically satisfactory polymerization rate. Stability and color clarity of the polycondensed product is obtained by this method.
REFERENCES:
patent: 3644291 (1972-02-01), Price et al.
patent: 3732182 (1973-05-01), Chimura et al.
patent: 3842041 (1974-10-01), Browne et al.
patent: 3859257 (1975-01-01), Schade et al.
patent: 4080317 (1978-03-01), Morawetz et al.
patent: 4133800 (1979-01-01), Taubinger et al.
Phynes Lucille M.
The Goodyear Tire & Rubber Company
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