Patent ID: 8815387
Filing Date: 2014-08-26
Classification: H05K,Y10T

Abstract:
1. A copper foil with an ultra thin adhesive layer for a printed wiring board comprising the ultra thin adhesive layer having a thickness of 1 to 3 μm, provided on a surface of the copper foil that has not undergone a roughening treatment, and as a result does not have fine copper particles adhering to the surface of the copper foil attributable to the roughening treatment, and has a surface roughness (Rz) of 2 μm or less, and wherein said ultra thin adhesive layer is formed using a resin mixture consisting of 20 to 80 parts by weight of an epoxy resin that may contain a curing agent, 20 to 80 parts by weight of a solvent-soluble aromatic polyamide resin polymer, and an effective amount of a curing accelerator, and wherein a resin flow of the ultra-thin adhesive layer when measured in accordance with MIL-P-13949G in the MIL Standard is 5% or less, and for the purpose of the resin flow measurement a thickness of the ultra-thin adhesive layer has been increased to 40 μm.