Process for the condensation of linear polyalkylene terephthalat

Details Process for the condensation of linear polyalkylene terephthalat Process for the condensation of linear polyalkylene terephthalat

1980-12-22

1983-06-07

Griffin, Ronald W.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

528274, 528480, 528483, 528490, 5283085, 528272, C08G 6326

Patent

active

043872131

ABSTRACT:
A process for condensing a linear polyalkylene terephthalate having a viscosity number of at least 60 cc/g in two stages, at an elevated temperature, in the solid phase, and in the presence of an alkanediol, comprises, in a first stage, treating the polyalkylene terephthalate in an inert gas stream at a reaction temperature 30.degree.-80.degree. C. below its melting point, with 0.2-3.5% by weight, based on the weight of the polyalkylene terephthalate, of an alkanediol whose boiling point under normal pressure is 20.degree.-70.degree. C. above the reaction temperature, wherein the amount of inert gas passed through per hour, measured under standard conditions, corresponds to 0.3 to 2 times the gross reactor volume; and, in a second stage, condensing the polyalkylene terephthalate in an inert gas stream at a temperature 5.degree.-25.degree. C. below its melting point, wherein the amount of inert gas passed through per hour, measured under standard conditions, corresponds to 2.5 to 10 times the gross reactor volume.

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patent: 4165420 (1979-08-01), Rinehart
patent: 4238593 (1980-12-01), Duh
patent: 4271287 (1981-06-01), Shah

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