Method for preserving porosity in porous materials

Details Method for preserving porosity in porous materials Method for preserving porosity in porous materials

C - Chemistry, Metallurgy

08

J

18/16, 6/48

C08J 9/26 (2006.01) A61L 15/00 (2006.01) C08H 1/00 (2006.01)

Patent

CA 1170001

ABSTRACT A dimensionally-stable, non-collapsible highly porous foam based upon an insoluble protein-based polymeric material, is produced by forming a liquid dispersion of an insoluble protein-based polymeric material which does not flow under elevated tempera- tures, quickly freezing the dispersion to form frozen liquid particles, subliming the frozen liquid particles to produce a highly porous foam, and subjecting the highly porous foam to elevated temperature and vacuum conditions sufficient to stabilize the highly porous foam so that its porosity is preserved when it is contacted with a liquid solution of a chemical cross- linking agent. The stabilized highly porous foam is then subjected to a liquid solution of a chemical crosslinking agent so as to produce a dimensionally- stable, non-collapsible highly porous foam material.

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