Kobe Steel, Ltd.

Kabushiki Kaisha Kobe Seiko Sho

Tatsuhiko Iwa

Takeshi Watase

Yasuo Hirano

Tetsuya Yamamoto

A surface-treated metal sheet for polyolefin adhesion is provided with a metal sheet, a first layer provided on at least one surface of the metal sheet, and a second layer provided on the first layer, wherein the first layer containing an epoxy resin and a blocked isocyanate, the second layer containing an acid-modified polyolefin resin, the thickness of the first layer being 15 to 40 μm, and the thickness of the second layer being 4 to 30 μm.

Surface-treated metal sheet for polyolefin adhesion, and composite member

A surface-treated metal sheet for adhesion to polyolefin includes a metal sheet, and a resin layer provided on at least one surface of the metal sheet. The resin layer contains an acid- modified polyolefin, the acid-modified polyolefin contains a first acid-modified polyolefin having an acid value of 5 mgKOH/g or less, particularly 4 to 5 mgKOH/g, and a second acid- modified polyolefin having an acid value of 20 mgKOH/g or more and a melting point of higher than 90&#xb0; C., and a difference between a melting point of the first acid-modified polyolefin and the melting point of the second acid-modified polyolefin is 0&#xb0; C. or more and less than 40&#xb0; C. The resin layer has a surface roughness of 12 &#x3bc;m or less in terms of arithmetic average roughness Ra.

Surface-treated metal plate for polyolefin bonding, composite member, and method for manufacturing composite member

Provided are: a surface-treated metal sheet that is useful when integrating a molded plastic (resin) article and a metal sheet during injection molding; and a metal sheet-resin composite molded article in which the metal sheet and a resin molded article are integrated. The surface-treated metal sheet consists of a laminate having a metal substrate, a chemical conversion coating film and an adhesive layer in order, and is characterized in that the chemical conversion coating film contains colloidal silica and a thermosetting resin.

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Kakogawa, Japan

Tatsuhiko Iwa