Patent ID: 6319620
Filing Date: 2001-11-20
Classification: C25D,H05K,Y10S,Y10T

Abstract:
A composite foil comprising a release layer uniformly disposed between a metal carrier layer and an ultra-thin copper foil wherein the release layer is an organic compound characterized by:a. containing at least one nitrogen atom;b. being capable of forming a bond with said copper foil and said metal carrier layer;c. retaining the ability to bond with copper after exposure to temperatures used in laminating said composite foil to a substrate;d. having a bond strength between said ultra-thin copper foil and said metal carrier layer of about 0.005 to 0.3 kgf/cm which is uniform and lower than the peel strength of said copper foil when laminated to a substrate, thereby permitting the metal carrier to be separated from said copper foil when said copper foil has been laminated to a substrate, ande. providing a very thin release layer which permits uniform deposition of said ultra-thin copper foil.