Samantha Danielle Smith

US Patent:

20050058821, Mar 17, 2005

Filed:

Sep 12, 2003

Appl. No.:

10/661908

Inventors:

Samantha Smith - Minneapolis MN, US
Gene Shipman - Cottage Grove MN, US
Robert Floyd - Maplewood MN, US
Harold Freemyer - Woodbury MN, US
Steven Hamrock - Stillwater MN, US
Michael Yandrasits - Hastings MN, US
David Walton - Honolulu HI, US

International Classification:

B32B035/00
B29C055/00
B32B003/26
B32B005/14
B32B009/00

US Classification:

428304400, 428308400, 428318400, 264173150

Abstract:

Shaped microporous articles are produced from polyvinylidene fluoride (PVDF) and nucleating agents using thermally induced phase separation (TIPS) processes. The shaped microporous article is oriented in at least one direction at a stretch ratio of at least approximately 1.1 to 1.0. The shaped article may also comprise a diluent, glyceryl triacetate. The shaped microporous article may also have the micropores filled with a sufficient quantity of ion conducting electrolyte to allow the membrane to function as an ion conductive membrane. The method of making a microporous article comprises the steps of melt blending polyvinylidene fluoride, nucleating agent and glyceryl triacetate; forming a shaped article of the mixture; cooling the shaped article to cause crystallization of the polyvinylidene fluoride and phase separation of the polyvinylidene fluoride and glyceryl triacetate; and stretching the shaped article in at least one direction at a stretch ratio of at least approximately 1.1 to 1.0.

US Patent:

20080113242, May 15, 2008

Filed:

Jan 15, 2008

Appl. No.:

12/014435

Inventors:

Samantha Smith - Minneapolis MN, US
Gene Shipman - Cottage Grove MN, US
Robert Floyd - Maplewood MN, US
Harold Feemyer - Woodbury MN, US
Steven Hamrock - Stillwater MN, US
Michael Yandrasits - Hastings MN, US
David Walton - Honolulu HI, US

International Classification:

H01M 8/10
H01M 4/00
H01M 14/00
H01M 2/16

US Classification:

429030000, 204296000, 204282000, 204252000

Abstract:

Shaped microporous articles are produced from polyvinylidene fluoride (PVDF) and nucleating agents using thermally induced phase separation (TIPS) processes. The shaped microporous article is oriented in at least one direction at a stretch ratio of at least approximately 1.1 to 1.0. The shaped article may also comprise a diluent, glyceryl triacetate. The shaped microporous article may also have the micropores filled with a sufficient quantity of ion conducting electrolyte to allow the membrane to function as an ion conductive membrane. The method of making a microporous article comprises the steps of melt blending polyvinylidene fluoride, nucleating agent and glyceryl triacetate; forming a shaped article of the mixture; cooling the shaped article to cause crystallization of the polyvinylidene fluoride and phase separation of the polyvinylidene fluoride and glyceryl triacetate; and stretching the shaped article in at least one direction at a stretch ratio of at least approximately 1.1 to 1.0.