Process for preparing copolyesters

Details Process for preparing copolyesters Process for preparing copolyesters

1994-02-09

1995-01-03

Acquah, Samuel A.

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

Synthetic resins

From carboxylic acid or derivative thereof

528272, 528282, 528283, 528307, 528308, 5283086, 525437, C08G 6382

Patent

active

053787960

ABSTRACT:
The present invention relates to a process for preparing copolyesters which involves two steps. The first step is a diol interchange step, and the second step is a polycondensation step. More specifically, the process involves (I) reacting in the presence of a polycondensation catalyst a dihydroxy terephthalate-containing compound having the formula: ##STR1## wherein n is 1 to 10 and at least 99% of the endgroups are ethylene glycol moieties; and 0.01 to 10 moles, based on moles of the dihydroxy terephthalate-containing compound, of a diol, and (II) polycondensing the reaction product of Step (I) to form a copolyester while excess diol is removed until desired molecular weight is obtained. This process does not include a transesterification of a dialkyl ester reaction or an esterification reaction which are usually used to produce copolyesters. Moreover, this process allows for polyethylene terephthalate and copolyesters prepared therefrom to be produced on an integrated production line.

REFERENCES:
patent: 2578660 (1951-12-01), Auspos et al.
patent: 3074913 (1963-01-01), Davies et al.
patent: 3377320 (1968-04-01), Zoetbrood
patent: 3988301 (1974-10-01), Jeurissen et al.
patent: 4940772 (1990-07-01), Matsumoto et al.
patent: 5095089 (1992-03-01), Mori et al.
patent: 5124435 (1992-06-01), Mori et al.
patent: 5185426 (1993-02-01), Verheijen et al.

Affiliated with

Also associated with

Rating

Process for preparing copolyesters 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 preparing copolyesters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for preparing copolyesters will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2212377