| 发明名称 |
Yield optimization of polycarbonate polyols |
| 摘要 |
Embodiments of the invention provide for methods of producing a polycarbonate polyol. The method includes charging a vessel with butanediol, charging the vessel with a polymerization catalyst, and adding to the vessel dimethyl carbonate at a rate of at least 2.0 g of DMC per minute per kg of BDO to produce polycarbonate polyol at a polycarbonate polyol yield of at least 80% of a theoretical yield. |
| 申请公布号 |
US9181392(B2) |
申请公布日期 |
2015.11.10 |
| 申请号 |
US201314379576 |
申请日期 |
2013.03.13 |
| 申请人 |
Dow Global Technologies LLC |
发明人 |
Heath William H.;Singh Harpreet;Singh Amarnath;Jimenez Jorge;Xu Qiuyun |
| 分类号 |
C08G64/00;C08G64/30;C08G64/02;C08G63/02 |
主分类号 |
C08G64/00 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. A method for producing a polycarbonate polyol, the method comprising:
charging a vessel with butanediol (BDO); charging the vessel with a polymerization catalyst; and adding to the vessel dimethyl carbonate (DMC) at a rate of at least 2.4 g of DMC per minute per kg of BDO to produce polycarbonate polyol at a polycarbonate polyol yield of at least 80% of a theoretical yield, wherein: at least the BDO is heated to between about 120 degrees Celsius and 240 degrees Celsius before the DMC is added to the vessel, and a transesterification polymerization reaction is performed by reacting the BDO and the DMC at a temperature between about 120 degrees Celsius and 240 degrees Celsius to form the polycarbonate polyol having a number average molecular weight of between about 1500 and 2500 g/mol. |
| 地址 |
Midland MI US |
