Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Treating polymer containing material or treating a solid...
Patent
1981-12-10
1983-05-03
Phynes, Lucille M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Treating polymer containing material or treating a solid...
528272, 528480, 5283083, 526 64, 526 65, C08G 6370
Patent
active
043821391
ABSTRACT:
Process and apparatus for continuous production of polyesters, characterized by an improvement in the esterification or interesterification stage, in which a mixture containing the starting materials, for example, terephthalic acid and ethylene glycol, is subjected to the shearing and homogenizing action of a rotor-stator, and the resultant homogeneous mixture is introduced into a thin-layer evaporator to produce a reaction mixture containing low molecular weight bis-hydroxyalkylene ester. This lower molecular weight product is then subjected to precondensation and polycondensation in accordance with conventional procedures to obtained the desired polyester product. In accordance with the present invention, the esterification degree can be increased substantially, without deteriorating the quality of the polyester.
REFERENCES:
patent: 3867349 (1975-02-01), Heeg et al.
patent: 4138544 (1979-02-01), Janssen et al.
patent: 4237261 (1980-12-01), Kawamura et al.
patent: 4313870 (1982-02-01), Imai et al.
Kapteina Friedhelm
Rink Jurgen
Didier Engineering GmbH
Phynes Lucille M.
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