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:
Mar. 12, 2019
Filed:
Apr. 03, 2015
Sumitomo Chemical Company, Limited, Tokyo, JP;
Junji Suzuki, Niihama, JP;
SUMITOMO CHEMICAL COMPANY, LIMITED, Tokyo, JP;
Abstract
A method is provided for producing a laminated porous film including: a porous base material layer containing polyolefin as a main component; a filler layer containing inorganic particles as a main component; and a resin layer containing resin particles as a main component, the filler layer and resin layer being provided on opposite surfaces of the porous base material layer. The method includes steps of: applying, on one surface of the porous base material layer, a coating solution containing more than 50 wt % of inorganic particles, and drying the coating solution to form a filler layer, and thereafter applying, on the other surface of the porous base material layer, a coating solution containing more than 50 wt % of resin particles, and drying the coating solution to form a resin layer, the weight percentages (wt %) being based on total weight of components other than the medium of each coating solution.