Reduction of acidity of polyesters by melt reaction endcapping w

Details Reduction of acidity of polyesters by melt reaction endcapping w Reduction of acidity of polyesters by melt reaction endcapping w

1989-08-23

1991-01-08

Kight, III, John

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

Synthetic resins

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

525439, 525444, 525540, C08F 2000

Patent

active

049836919

ABSTRACT:
A method for the melt reaction of polyesters, particularly polyethylene terephthalate, with an endcapping agent which reacts with terminal carboxyl groups of the polyester. The endcapping agents are selected from the group consisting of dialkyloxylates and tetraalkylureas.

REFERENCES:
patent: 3839272 (1974-10-01), Yankowsky
patent: 3968159 (1976-07-01), Iqbal
patent: 4200731 (1980-04-01), Massey et al.
patent: 4774315 (1988-09-01), Miller
patent: 4886875 (1989-12-01), Gay et al.
CA82(4):18563p "Hydrolytic and Melt Degradation Stabilized Polyester".
CA109(24):212124n "Manufacture of Hydrolysis-Resistant Polyester Resin Composition".
CA112(16):140505z "Manufacture of End-Capped Polyester With Low Moisture Absorption".

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