| 发明名称 | Method for producing low-substituted hydroxypropylcellulose | ||
| 摘要 | Provided is a method for producing low-substituted hydroxypropylcellulose in which depolymerization capable of achieving a target viscosity in a short time is carried out safely after an etherification reaction step. More specifically, provided is a method for producing low-substituted hydroxypropylcellulose having a degree of hydroxypropoxy substitution of from 9.5 to 16.0% by weight, comprising at least a step of reacting alkali cellulose with an etherifying agent and a step of carrying out depolymerization after the reaction. | ||
| 申请公布号 | US9546222(B2) | 申请公布日期 | 2017.01.17 |
| 申请号 | US201113230959 | 申请日期 | 2011.09.13 |
| 申请人 | Shin-Etsu Chemical Co., Ltd. | 发明人 | Kitamura Akira;Suzuki Takahiro;Narita Mitsuo |
| 分类号 | C08B37/00;C08B11/08;C08B1/08;C08B11/20 | 主分类号 | C08B37/00 |
| 代理机构 | Alston & Bird LLP | 代理人 | Alston & Bird LLP |
| 主权项 | 1. A method for producing low-substituted hydroxypropylcellulose having a degree of hydroxypropoxy substitution of from 9.5 to 16.0% by weight, comprising at least the steps of: reacting alkali cellulose with an etherifying agent to obtain low-substituted hydroxypropylcellulose, and depolymerizing the obtained low-substituted hydroxypropylcellulose, wherein the step of depolymerizing comprises adjusting an oxygen concentration in a reactor to 3 to 7.5% by volume, and wherein the hydroxypropylcellulose is insoluble in water, but soluble in an alkali solution. | ||
| 地址 | Tokyo JP | ||