公开(公告)号：US20180077798A1

公开(公告)日：2018-03-15

申请号：US15552282

申请日：2015-12-16

Applicant: DOWA ELECTRONICS MATERIALS CO., LTD.

Inventor： Hidefumi FUJITA ,  Shuji KANEDA ,  Daisuke ITOH

IPC: H05K1/09 ,  H05K1/03 ,  H01B1/22 ,  H05K3/12 ,  H01B3/44 ,  B05D3/06 ,  B05D3/12

CPC classification number: H05K1/097 ,  B05D3/06 ,  B05D3/12 ,  H01B1/22 ,  H01B3/448 ,  H01B5/00 ,  H01B5/14 ,  H01B13/00 ,  H05K1/0386 ,  H05K3/12 ,  H05K3/1291 ,  H05K2203/0278

Abstract: To provide a copper electroconductive film formed on a paper substrate, the copper electroconductive film being considerably improved in weather resistance and electroconductivity. The problem can be achieved by an electroconductive film formed by pressing a sintered electroconductive film formed by sintering copper particles in a coating film containing copper powder on a paper substrate along with the substrate, the electroconductive film having an area ratio of copper occupying on a cross section of the electroconductive film in parallel to a thickness direction thereof of 82.0% or more. The electroconductive film can be produced by pressing, for example, by roll press to from 90 to 190° C., after light sintering.

公开(公告)号：US20170132505A1

公开(公告)日：2017-05-11

申请号：US15322785

申请日：2015-06-18

Applicant: DOWA ELECTRONICS MATERIALS CO., LTD.

Inventor： Daiki YOSHIHARA ,  Hirotoshi SAITO ,  Shuji YAMASHITA ,  Daisuke ITOH

IPC: G06K19/077 ,  B32B7/12 ,  B32B29/00

CPC classification number: G06K19/0772 ,  B32B7/12 ,  B32B29/00 ,  B32B29/002 ,  B32B2519/02 ,  G06K19/02 ,  G09F3/00

Abstract: An RFID tag substrate contains a paper substrate having an eluted chloride ion amount per unit mass (1 g) of 0.100 mg or less, having formed on a surface thereof a conduction circuit. A specimen of the paper substrate is broken into small pieces each of 100 mm2 or less. The small pieces are immersed in a polypropylene vessel having 50 mL of water with an electric conductivity of 0.2 mS/m or less. After standing, the water is filtered with a membrane filter to recover a filtrate and the filtrate is analyzed by an ion chromatography method to obtain a chloride ion (Cl−) concentration in the filtrate, from which a total chloride ion amount eluted into 50 mL of the water is obtained, and is divided by the mass (g) of the specimen to provide a value, which is designated as the eluted chloride ion amount per unit mass.