Sk Innovation Co., Ltd.

Nexflex Co., Ltd.

Dae Nyoun Kim

Young Do Kim

Ho Sub Kim

Weon Jung Choi

Byoung Wook Jo

Yong Seok Lee

Seung Jeong Kook

Provided are a multi-layer flexible metal-clad laminate, and a manufacturing method thereof, and more particularly, a multi-layer flexible metal-clad laminate in which at the time of manufacturing a multi-layer polyimide film on a surface of a metal-clad having a predetermined surface roughness value (Rz, Ra) and having roughening particles having a predetermined size or less attached thereon, a multi-coating scheme is used to form each polyimide mixed layer, such that a light reflection on a surface of the polyimide film and a light reflection generated at an interlayer interface of the polyimide in the multi-layer polyimide film are decreased to have an improved light transmittance of a polyimide laminate film after the metal-clad is removed, and a manufacturing method thereof.

Multi-layer flexible metal-clad laminate and manufacturing method thereof

Provided is a method for manufacturing a flexible metal-clad laminate using a casting method, including: (a) forming a first polyimide layer having a coefficient of linear thermal expansion of 25 ppm/K or less above a metal layer; (b) plasma-treating a surface of the first polyimide layer; and (c) forming a second polyimide layer having a coefficient of linear thermal expansion of 25 ppm/K or lower above the first polyimide layer. The flexible metal-clad laminate according to the present invention can have excellent adhesion between the polymer film and the metal conductive layer, a low dimensional change, and a low production cost, because of superior casting workability, even though the thickness of polyimide becomes increased.

Method for manufacturing thick polyimide flexible metal-clad laminate

A flexible metal clad laminate includes a metal foil, and a multilayered polyimide film including a first polyimide layer having a glass transition temperature of 300&#xb0; C. or less and disposed on the metal foil, a second polyimide layer disposed on the first polyimide layer and a third polyimide layer disposed on the second polyimide layer. According to the flexible metal clad laminate of the present invention, appearance defects such as blistering generated during curing process in a continuous curing machine using an infrared heat source may be solved, interlayer delamination may be prevented due to a good adhesion strength with a metal layer, and an ACF bonding strength and a dimensional stability may be good. The flexible metal clad laminate may be useful for the manufacturing of a flexible printed circuit boards.

Flexible metal clad laminate and manufacturing method thereof

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Daejeon, South Korea

Dae Nyoun Kim