Samsung Electro-mechanics Co., Ltd.

Bum-Young Myoung

Dek-Gin Yang

Dong-Kuk Kim

Byoung-Ho Rhee

Yang-Je Lee

Disclosed are a rigid-flexible PCB and a method for fabricating the rigid-flexible PCB. Characterized by using a liquid crystalline polymer for the formation of coverlay over flexible regions, the all-layer processing method has the advantage of preventing interlayer delamination, thereby providing a highly reliable rigid-flexible PCB which thus meets the recent requirements of electric appliances for low energy consumption, high frequency adoption, and slimness.

Rigid-flexible PCB having coverlay made of liquid crystalline polymer and fabrication method thereof

Disclosed herein are a brown oxide pretreatment composition for cleaning a copper surface and improving adhesion of a polyimide surface, and a method for improving adhesion of a polyimide surface by applying the composition to a brown oxide process. The brown oxide pretreatment composition for cleaning a copper surface and improving adhesion of a polyimide surface comprises, 5&#x2dc;15 g/L of an amine; 190&#x2dc;210 g/L of a hydroxide compound; at least one additive selected from 3&#x2dc;6 g/L of a cleaner adjuvant, 0.1&#x2dc;5 g/L of a antifoaming agent and 1&#x2dc;10 g/L of a precipitation inhibitor; and the balance of water. When the brown oxide pretreatment composition for cleaning a copper surface and improving adhesion of a polyimide surface is applied to a pretreatment step of a brown oxide process, it can clean a copper surface and improve adhesion of a polyimide surface.

Brown oxide pretreatment composition for cleaning copper surface and improving adhesion of polyimide surface, and method for improving adhesion of polyimide surface by applying the same to brown oxide process

Growing community of inventors

Seoul, South Korea

Bum-Young Myoung