发明授权
- 专利标题: Method for purifying polyalkylsiloxanes and the resulting products
- 专利标题(中): 聚烷基硅氧烷的纯化方法和所得产物
-
申请号: US574961申请日: 1995-12-19
-
公开(公告)号: US5703191A公开(公告)日: 1997-12-30
- 发明人: Danny L. Henderson , Dale R. Powers
- 申请人: Danny L. Henderson , Dale R. Powers
- 申请人地址: NY Corning
- 专利权人: Corning Incorporated
- 当前专利权人: Corning Incorporated
- 当前专利权人地址: NY Corning
- 主分类号: G02B6/00
- IPC分类号: G02B6/00 ; C03B8/04 ; C03B19/06 ; C03B19/14 ; C03B20/00 ; C03B37/014 ; C03B37/018 ; C03C1/02 ; C03C3/06 ; C03C13/04 ; C07F7/20 ; C07F7/21 ; C08G77/04 ; C08L83/04 ; C08G77/12
摘要:
The present invention is directed to a purified polyalkylsiloxane composition having a boiling point, under atmospheric conditions, of less than about 250.degree. C. and containing high boiling impurities, including siloxanes and silanol-terminated siloxanes, that have boiling points, under atmospheric conditions, of greater than about 250.degree. C. in a total concentration of less than 14 ppm. The present invention is further directed to a method of producing a purified polyalkylsiloxane composition, having a boiling point, under atmospheric conditions, of less than about 250.degree. C., by distilling a polyalkylsiloxane starting material containing high boiling impurities having boiling points, under atmospheric conditions, of greater than about 250.degree. C. in a total concentration of at least 14 ppm, under conditions effective to produce a purified polyalkylsiloxane composition having a boiling point under atmospheric conditions of less than about 250.degree. C., and containing high boiling impurities, having boiling points, under atmospheric conditions, of greater than about 250.degree. C., in a total concentration of less than 14 ppm. In preferred embodiments, low boiling components (including silanols and preferably also hexamethylcyclotrisiloxane) are reduced to less than about 100 ppm. The present invention is further directed to a method of producing fused silica glass by conversion of the purified polyalkylsiloxane composition.
公开/授权文献
- US4011430A Multizone electrical furnace methods and apparatus 公开/授权日:1977-03-08