发明授权
US5057602A Para-phenylene diamine polymer color improvement with sequestering agent 失效
对苯二甲酸二聚体聚合物颜色改进与序列代理

Para-phenylene diamine polymer color improvement with sequestering agent
摘要:
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.
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