The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 19, 2005
Filed:
Jun. 27, 2002
Takahiro Daido, Iwakuni, JP;
Satoshi Igarashi, Iwakuni, JP;
Satoshi Nishikawa, Iwakuni, JP;
Hiroyuki Honmoto, Iwakuni, JP;
Hiroyoshi Minematsu, Iwakuni, JP;
Youji Yanagi, Iwakuni, JP;
Yasushi Kitagishi, Iwakuni, JP;
Takahiro Daido, Iwakuni, JP;
Satoshi Igarashi, Iwakuni, JP;
Satoshi Nishikawa, Iwakuni, JP;
Hiroyuki Honmoto, Iwakuni, JP;
Hiroyoshi Minematsu, Iwakuni, JP;
Youji Yanagi, Iwakuni, JP;
Yasushi Kitagishi, Iwakuni, JP;
Teijin Limited, Osaka, JP;
Abstract
A process for production of a composite porous film wherein a porous support, of which both sides have been coated with a solution (dope) of an organic polymer compound in a water-soluble organic solvent to form a coated film, is passed through an air gap step and conveyed into a coagulating bath comprising water or a mixture of water with the same solvent as the organic solvent, and is then immersed in the coagulating bath so that the coated film on both surfaces of the porous support directly contact the coagulating bath for coagulation, and is then washed and dried. This production process is suitable for production of non-aqueous secondary battery separators, and yields non-aqueous secondary battery separators with good handling properties and at low cost, whereby the ion permeability, adhesion with electrodes and electrolyte solution retention can be strictly controlled.