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
- 专利标题: Para-phenylene diamine polymer color improvement with sequestering agent
- 专利标题(中): 对苯二甲酸二聚体聚合物颜色改进与序列代理
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申请号: US431227申请日: 1989-11-03
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公开(公告)号: US5057602A公开(公告)日: 1991-10-15
- 发明人: Vlodek Gabara , Angela M. Lapallo
- 申请人: Vlodek Gabara , Angela M. Lapallo
- 申请人地址: DE Wilmington
- 专利权人: E. I. DuPont de Nemours and Company
- 当前专利权人: E. I. DuPont de Nemours and Company
- 当前专利权人地址: DE Wilmington
- 主分类号: C08J3/00
- IPC分类号: C08J3/00 ; C08G69/46 ; C08G69/48
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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