发明授权
- 专利标题: Method for the fractionation of reactive terminated polymerizable oligomers
- 专利标题(中): 分离反应性封端的可聚合低聚物的方法
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申请号: US759630申请日: 1985-07-26
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公开(公告)号: US4622383A公开(公告)日: 1986-11-11
- 发明人: Constance J. Araps , Steven M. Kandetzke , Mark A. Takacs
- 申请人: Constance J. Araps , Steven M. Kandetzke , Mark A. Takacs
- 申请人地址: NY Armonk
- 专利权人: International Business Machines Corporation
- 当前专利权人: International Business Machines Corporation
- 当前专利权人地址: NY Armonk
- 主分类号: H01L21/312
- IPC分类号: H01L21/312 ; H01L21/762 ; H01L23/532 ; H05K1/00 ; H05K1/03 ; H05K3/46 ; C08G69/26 ; C08G69/34
摘要:
Acetylene or vinyl-terminated polymerizable oligomers of polyamic acid are fractionated to obtain an oligomer product having a molecular weight in the range of 2,000 to 4,000 which exhibits improved wetting and film forming properties. Fractionization is accomplished by dissolving the unfractionated polymerizable oligomer in a solvent in which the desired molecular weight fraction is soluble. The oligomer solution is passed through a filter which removes undissolved material having a molecular weight in excess of the desired molecular weight range. The filtrate is admixed with a hydrocarbon to precipitate the desired molecular weight fraction. Thereafter the collected solids can be redissolved in a ketonic solvent and the fractionation procedure repeated to further improve the molecular weight content of the fractionated oligomer.
公开/授权文献
- US5738715A Emulsion ink for stencil printing 公开/授权日:1998-04-14