The present invention relates to a flexible metal laminate with low dielectric constant, which may be applied for a substrate for a flexible printed circuit. A flexible metal laminate according to one aspect of the invention includes a first metal layer; a first polyimide layer; a polyimide layer including fluoropolymer dispersed therein, formed on the first polyimide layer; and a second polyimide layer formed on the polyimide layer including fluoropolymer dispersed therein; wherein in the polyimider layer including dispersed fluoropolymer, the content of the fluoropolymer per unit volume is higher at 40 to 60% depth than at 5 to 10% depth of the total thickness from the surface of the polyimide layer.

Flexible metal laminate containing fluoropolymer

There is provided a flexible metal laminate including a polymer resin layer including a polyimide resin of a specific structure and a fluororesin, wherein the fluororesin is more distributed through the inside of the polymer resin layer than at the surface of the polymer resin layer.

Flexible metal laminate

The present invention relates to a flexible metal laminate having low permittivity, capable of being applied to a soft printed circuit board. According to one aspect of the present invention, the flexible metal laminate comprises: a first metal layer; a first polyimide layer; a polyimide layer in which a fluorocarbon resin, which is formed on the first polyimide layer, is dispersed; and a second polyimide layer formed on the polyimide layer in which a fluorocarbon resin is dispersed, wherein the content per unit volume of the fluorocarbon resin is greater in a depth of 40-60% than in a depth of 5-10% of the total thickness from the surface of the polyimide layer in which a fluorocarbon resin is dispersed.

Flexible metal laminate containing fluorocarbon resin

PROBLEM TO BE SOLVED: To provide a method of heat-treating a long object such as a textile, a film, a sheet, a metal foil, and a metal foil laminate capable of efficiently converting a metal foil laminate prepared by directly applying a polyimide resin solution in particular onto a metal foil and subsequently subjecting it to a preliminary drying treatment, into a metal foil laminate free of curling and excellent in such a characteristics as dimensional precision, dimensional stability and moisture absorption characteristics, at a high yield. SOLUTION: The method of heat-treating a metal foil laminate prepared by continuously applying a polyimide resin solution onto a metal foil and subjecting the resulting metal foil laminate to a preliminary drying treatment whereby the metal foil laminate is made free of curling and made to have an excellent dimensional stability at a high yield, is characterized in that the long object prepared as described above is continuously transferred with its one side or both sides covered with a long object(s) other than the long object in question in the course of its heat treatment in a furnace. COPYRIGHT: (C)2009,JPO&INPIT

Method of treating long object

The present invention relates to a flexible metal laminate sheet comprising a polymer resin layer including a polyimide resin having a specific structure and a fluorine-based resin. More fluorine-based resin is distributed on the inside of the polymer resin layer than at the surface of the polymer resin layer.

Masanori Murata

Papers

Flexible printed circuit board

Method of fabricating flexible printed circuit board