Para-phenylene diamine polymer color improvement with sequesteri

Details Para-phenylene diamine polymer color improvement with sequesteri Para-phenylene diamine polymer color improvement with sequesteri

1989-11-03

1991-10-15

Anderson, Harold D.

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

Synthetic resins

Treating polymer containing material or treating a solid...

528348, 528492, 528499, C08G 6946

Patent

active

050576020

ABSTRACT:
A process is provided for increasing the brightness and decreasing the discoloration of PPD polymer during the polymer production. Sequestering agents having a stability constant (K.sub.1), for Fe(III), greater than about 12 are slurried with the PPD polymer in water and then rinsed, neutralized, and dried.

REFERENCES:
patent: 3475771 (1969-11-01), Quynn

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