Reduction of carboxyl end groups in polyester with dilactim ethe

Details Reduction of carboxyl end groups in polyester with dilactim ethe Reduction of carboxyl end groups in polyester with dilactim ethe

1989-01-03

1990-05-29

Foelak, Morton

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

Synthetic resins

From carboxylic acid or derivative thereof

528289, 5283086, 528323, 528330, 525437, 525540, 2641761, 26421114, C08G 6302

Patent

active

049297155

ABSTRACT:
An improved process for controlling and reducing the concentration of free carboxyl end groups in condensation polyester melt spun fiber is provided. The difunctional compound, serves to increase the intrinsic viscosity of the fiber. The process comprises admixing and reacting with molten polyester polymer an effective amount of a lactim compound of the formula ##STR1## wherein x and y may be alike or different and represent an integer of 2 to 15; and

REFERENCES:
patent: 3141006 (1964-07-01), Kohan
patent: 4016142 (1977-04-01), Alexander et al.
patent: 4442058 (1984-04-01), Griffith et al.
patent: 4543396 (1985-09-01), Arai et al.

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