Preparation of polyesters

Details Preparation of polyesters Preparation of polyesters

1978-06-19

1979-05-15

Phynes, Lucille M.

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

Synthetic resins

From carboxylic acid or derivative thereof

528309, C08G 6330

Patent

active

041549210

ABSTRACT:
The formation of manganese-derivative scale in equipment involved in polyester manufacture is reduced by introduction of a sterically hindered benzoic acid in approximately stoichiometric amount. The acids include 2,6-dichloro-, 2,6-dimethyl- and 2,4,6-trimethylbenzoic acids. The scale is believed to be insoluble manganese terephthalate, presumably formed by reaction of manganese acetate catalyst generated as a result of a side reaction during the ester exchange reaction of dimethyl terephthalate with excess ethylene glycol. Preferably an alkali metal salt of an organic acid, such as sodium acetate or lithium acetate is also used to give a synergistic effect in combination with the hindered acid.

REFERENCES:
patent: 3468849 (1969-09-01), Rothert
patent: 4057534 (1977-11-01), Konishi et al.

Affiliated with

Also associated with

Rating

Preparation of polyesters does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Preparation of polyesters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Preparation of polyesters will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1098647