Jx Nippon Mining Metals Corporation

Kohsuke Arai

Atsushi Miki

Hideta Arai

Kaichiro Nakamuro

A surface treated copper foil which is well bonded to a resin and achieves excellent visibility when observed through the resin, and a laminate using the same are provided. The surface treated copper foil to be laminated on a polyimide having the following &#x394;B (PI) of 50 or more and 65 or less before being laminated to the copper foil so as to form a copper clad laminate comprising a surface having a color difference &#x394;E*ab of 50 or more based on JIS Z 8730 through the polyimide and a difference between the top average Bt and the bottom average Bb in a brightness curve extending from an edge of the copper foil to a portion without the copper foil &#x394;B (&#x394;B=Bt&#x2212;Bb) of 40 or more, wherein the brightness curve is obtained from an observation spot versus brightness graph of measurement results of the brightness of the photographed image of the copper foil through the polyimide laminated from the surface treated surface side with a CCD camera for the respective observation spots along the perpendicular direction of the extending direction of the observed copper foil.

Surface treated copper foil and laminate using the same, printed wiring board, and copper clad laminate

A surface treated copper foil which is well bonded to a resin and achieves excellent visibility when observed through the resin, and a laminate using the same are provided. A surface treated copper foil comprising at least one surface treated surface with a color difference &#x394;E*ab of 40 or more based on JIS Z 8730, and a difference between the top average Bt and the bottom average Bb in a brightness curve extending from an end of the copper foil to a portion without the copper foil &#x394;B (&#x394;B=Bt&#x2212;Bb) of 40 or more, after lamination of the surface treated surface to a polyimide having a &#x394;B (PI) defined as above of 50 or more and 65 or less before being laminated to the copper foil, wherein the brightness curve is obtained from an observation spot versus brightness graph of measurement results of the brightness of the photographed image of the copper foil through the polyimide with a CCD camera for the respective observation spots along the direction perpendicular to the extending direction of the observed copper foil.

Surface treated copper foil and laminate using the same

A surface treated copper foil which is well bonded to a resin and allows the resin to have excellent transparency after removal of the copper foil by etching, and a laminate using the same are provided. A surface treated copper foil having at least one surface with a skewness Rsk of &#x2212;0.35 to 0.53, comprising an Sv defined by the following expression (1) of 3.5 or more based on a brightness curve:=(&#x394;&#xd7;0.1)/(1&#x2212;2)&#x2003;&#x2003;(1);

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Hitachi, Japan

Kohsuke Arai