Para-phenylene diamine polymer color improvement

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

1991-01-22

1993-09-21

Anderson, Harold D.

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

Synthetic resins

From carboxylic acid or derivative thereof

528336, C08G 6946

Patent

active

052470563

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: 3415611 (1968-12-01), Callahan et al.
patent: 3475771 (1969-11-01), Quynn et al.
patent: 3819587 (1974-06-01), Kwoleck
patent: 4308374 (1981-12-01), Vollbracht et al.
patent: 4650624 (1987-03-01), Reinehr et al.
patent: 5057602 (1991-10-01), Gabara et al.

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