发明公开
EP0227819A4 A PROCESS FOR INCREASING THE MOLECULAR WEIGHT OF POLY(ALKYLENE CARBONATE) POLYOLS.
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基本信息:
- 专利标题： A PROCESS FOR INCREASING THE MOLECULAR WEIGHT OF POLY(ALKYLENE CARBONATE) POLYOLS.
- 专利标题（中）：法提高聚（亚烷基碳酸酯）多元醇的分子量。
- 申请号：EP86904595 申请日：1986-06-26
- 公开(公告)号：EP0227819A4 公开(公告)日：1988-02-08
- 发明人： HARRIS ROBERT F
- 申请人： DOW CHEMICAL CO
- 专利权人： DOW CHEMICAL CO
- 当前专利权人： DOW CHEMICAL CO
- 优先权： US75036285 1985-07-01
- 主分类号： C08G18/42
- IPC分类号： C08G18/42 ; C08G18/44 ; C08G18/46 ; C08G64/20 ; C08G64/40 ; C08G18/08
摘要：
Process for increasing the molecular weight of a poly(alkylene carbonate) polyol which comprises exposing the poly(alkylene carbonate) polyol to elevated temperatures at which dialkylene glycol, trialkylene glycol, or initiator segments, wherein the initiator has about the same or greater volatility as the dialkylene glycol or trialkylene glycol segment, are abstracted from the poly(alkylene carbonate) polyol, at a pressure wherein the dialkylene glycol, trialkylene glycol, or initiator is volatile, and removing the volatile dialkylene glycol, trialkylene glycol, or initiator from the mass of the poly(alkylene carbonate) polyol, under conditions such that the molecular weight of the poly(alkylene carbonate) polyol is increased.
IPC结构图谱:
| C | 化学；冶金 |
| --C08 | 有机高分子化合物；其制备或化学加工；以其为基料的组合物 |
| ----C08G | 用碳—碳不饱和键以外的反应得到的高分子化合物 |
| ------C08G18/00 | 异氰酸酯类或异硫氰酸酯类的聚合产物 |
| --------C08G18/06 | .与具有活性氢的化合物 |
| ----------C08G18/08 | ..工艺过程 |
| ------------C08G18/30 | ...低分子量化合物 |
| --------------C08G18/42 | ....在主链中具有羧基或碳酸酯基的缩聚物 |