| 发明名称 |
POLYVINYL ALCOHOL AND PURIFICATION METHOD THEREOF |
| 摘要 |
Highly purified polyvinyl alcohol (PVA) which meets the standard of pharmaceutical grade is provided. The PVA has of less than 0.1 wt % of residual methanol, less than 0.1 wt % of residual methyl acetate, and less than 0.3 wt % of residual sodium acetate. A method for obtaining highly purified PVA is further provided. |
| 申请公布号 |
US2016215076(A1) |
申请公布日期 |
2016.07.28 |
| 申请号 |
US201615006513 |
申请日期 |
2016.01.26 |
| 申请人 |
CHANG CHUN PETROCHEMICAL CO., LTD. |
发明人 |
LU CHIH-SHENG;LU WEN-SHIEN;HSU CHIA-HAO |
| 分类号 |
C08F6/12 |
主分类号 |
C08F6/12 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. A method for purifying polyvinyl alcohol, comprising the steps of:
(a) adding polyvinyl alcohol prepared by hydrolyzing polyvinyl acetate with catalysis by a base into an ethanol solution with an ethanol concentration of 95 wt % or higher; (b) heating and stirring the ethanol solution of comprising the polyvinyl alcohol; and (c) retrieving the polyvinyl alcohol from the ethanol solution comprising the polyvinyl alcohol, and drying the retrieved polyvinyl alcohol. |
| 地址 |
TAIPEI CITY TW |
