| 发明名称 |
Para-phenylene diamine polymer color improvement |
| 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 (K1), 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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| 申请公布号 |
US5247056(A) |
申请公布日期 |
1993.09.21 |
| 申请号 |
US19910644387 |
申请日期 |
1991.01.22 |
| 申请人 |
E. I. DU PONT DE NEMOURS AND COMPANY |
发明人 |
GABABA, VLODEK;LAPALLO, ANGELA M. |
| 分类号 |
C08G69/48 |
主分类号 |
C08G69/48 |
| 代理机构 |
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代理人 |
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| 主权项 |
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