发明名称 |
CONTINUOUS ADDITION PROCESS FOR PREPARING HYDROXYALKYLALKYLCELLULOSE ETHERS |
摘要 |
Higher reaction efficiencies are seen in cellulose etherification reactions when the reagents are continuously added to alkali cellulose at elevated temperatures. In particular, mixed hydroxyalkylcellulose ethers are prepared with higher reaction efficiencies using this process. In an especially preferred embodiment, hydroxypropylmethylcellulose is prepared by continuously adding propylene oxide to heated cellulose containing a small amount of caustic, adding more caustic and then continuously adding methyl chloride at elevated temperatures. |
申请公布号 |
DE3472109(D1) |
申请公布日期 |
1988.07.21 |
申请号 |
DE19843472109 |
申请日期 |
1984.07.03 |
申请人 |
THE DOW CHEMICAL COMPANY |
发明人 |
STRANGE, CARL P.;MESSELT, CHRISTOPHER D.;GIBSON, CLARK WAYNE |
分类号 |
C08B11/12;C08B11/08;C08B11/193;(IPC1-7):C08B11/193 |
主分类号 |
C08B11/12 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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