Process for the regeneration and further processing of inactive,

Details Process for the regeneration and further processing of inactive, Process for the regeneration and further processing of inactive,

1980-12-22

1982-11-23

Griffin, Ronald W.

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

Synthetic resins

From carboxylic acid or derivative thereof

521 485, 528274, 528309, 528480, 528483, 528490, C08G 6326

Patent

active

043606610

ABSTRACT:
A process for the regeneration and further condensation of a linear polyalkylene terephthalate, which is inactive due to recondensation treatment in the solid phase, and which has a viscosity number of at least 60 cc/g, the process being conducted in two stages, at an elevated temperature, in the presence of an alkanediol, comprises, in a first stage, treating the inactive polyalkylene terephthalate at a reaction temperature of 30.degree.-80.degree. C. below its melting point, with 0.3-3.5% 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, in an inert gas stream, wherein the amount of inert gas passed through per hour, measured under standard conditions, corresponds to 0.3-2 times the gross reactor volume; and, in a second stage, condensing the polyalkylene terephthalate at a temperature of 5.degree.-25.degree. C. below its melting point in an inert gas stream, wherein the amount of inert gas passed through per hour, measured under standard conditions, corresponds to 2.5-10 times the gross reactor volume.

REFERENCES:
patent: T873013 (1970-04-01), Kibler
patent: 3222299 (1965-12-01), MacDowell
patent: 3344091 (1967-09-01), Russin et al.
patent: 3405098 (1965-10-01), Heighton et al.
patent: 3453240 (1964-09-01), Plaster et al.
patent: 3585259 (1971-06-01), Lefferts et al.
patent: 3634356 (1972-01-01), Tryon
patent: 3953404 (1974-02-01), Borman et al.
patent: 4078143 (1978-03-01), Malik et al.
patent: 4165420 (1979-08-01), Rinehart
patent: 4238593 (1980-12-01), Duh
patent: 4271287 (1981-06-01), Shah

Affiliated with

Also associated with

Rating

Process for the regeneration and further processing of inactive, does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for the regeneration and further processing of inactive,, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the regeneration and further processing of inactive, will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1880051