Controlled pore composite polytetrafluoroethylene article...

Details Controlled pore composite polytetrafluoroethylene article... Controlled pore composite polytetrafluoroethylene article...

C - Chemistry, Metallurgy

08

J

18/1027, 18/18,

C08J 5/04 (2006.01) B01D 15/08 (2006.01) B01J 20/26 (2006.01) B01J 20/28 (2006.01) B29C 43/24 (2006.01) G01N 30/52 (2006.01)

Patent

CA 2035295

ABSTRACT OF THE DISCLOSURE 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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