发明名称 |
CONTROLLED PORE COMPOSITE POLYTETRAFLUOROETHYLENE ARTICLE AND METHOD THEREFOR |
摘要 |
A composite article having controlled void volume and mean pore size comprises: (a) polytetrafluoroethylene (PTFE) fibril matrix, and (b) insoluble, non-swellable sorptive particles enmeshed in said matrix, the ratio of non-swellable sorptive particles to PTFE is in the range of 40:1 to 1:4 by weight, the composite article having a porosity in the range of 30 to 80 percent void volume and a mean pore size in the range of 0.3 to 5 micrometers, preferably with at least 90 percent of pores having a size less than 3.6 micrometers. The article is prepared by incorporating lubricant in the precursor admixture in an amount sufficient to provide a soft dough-like mass and exceed the lubricant sorptive capacity of the particles by at least 3 weight percent and up to an amount at which the mass loses its integrity.
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申请公布号 |
CA2035295(A1) |
申请公布日期 |
1991.08.24 |
申请号 |
CA19912035295 |
申请日期 |
1991.01.30 |
申请人 |
MINNESOTA MINING AND MANUFACTURING COMPANY |
发明人 |
HAGEN, DONALD F.;MARKELL, CRAIG G.;BALSIMO, WILLIAM V.;ERREDE, LOUIS A. |
分类号 |
B01D15/08;B01J20/28;B01J20/285;C08J9/26;G01N30/52;G01N30/88;(IPC1-7):C08J5/04;B29C43/24;B01J20/26;G01N30/48 |
主分类号 |
B01D15/08 |
代理机构 |
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主权项 |
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地址 |
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