摘要:
A multilayer printed circuit board can be used in high-frequency applications, is not easily affected by environmental changes, and has stable dielectric characteristics. A multilayer printed circuit board suitable for use in the high-frequency range includes at least two printed wiring sheets laminated with an interlayer bonding member therebetween. At least one of the at least two printed wiring sheets includes an insulating film, an adhesive layer containing a thermoplastic polyimide disposed on at least one surface of the insulating film, and a metal wiring layer disposed on the adhesive layer. The interlayer bonding member contains a thermoplastic polyimide.
摘要:
A process for producing an adhesive film includes laminating an adhesive layer containing thermoplastic polyimide onto at least one surface of a highly heat-resistant polyimide layer by coextrusion casting method, wherein a chemical dehydrator and a catalyst are contained in a precursor solution of the highly heat-resistant polyimide and/or a solution containing either the thermoplastic polyimide or a precursor of the thermoplastic polyimide.
摘要:
Disclosed is a method of manufacturing a flexible laminate substrate having an improved appearance and dimensional stability after removal of a metal foil. Specifically disclosed is a method of manufacturing a flexible laminate substrate 5 wherein a metal foil 2 is bonded to at least one surface of a heat-resistant adhesive film 3. The method comprises a step wherein the heat-resistant adhesive film 3 and the metal foil 2 are thermally laminated between a pair of metal rolls 4 via a protective film 1, thereby forming a laminate 7 wherein the heat-resistant adhesive film 3, the metal foil 2, and the protective film 1 are bonded together, and another step wherein the protective film 1 is removed. The tension of the laminate 7 at the time when the protective film 1 is removed is higher than the tension of the laminate 7 before the removal of the protective film 1.
摘要:
A bonding sheet that can be bonded with a metal foil by thermal lamination and has excellent adhesiveness and reduced warpage, and a one-side metal-clad laminate are provided. A bonding sheet has an adhesive layer containing a thermoplastic resin disposed on one side of a heat resistant film and a non-adhesive layer containing a non-thermoplastic resin and a thermoplastic resin disposed on the other side of the heat resistant film. The ratio of the non-thermoplastic resin to the thermoplastic resin in the non-adhesive layer is 82/18 to 97/3 on a weight basis.
摘要:
It is an object of the present invention to provide an adhesive film which is used for producing, by a laminating method, a flexible metal-clad laminate in which the change in dimensions is suppressed, a flexible metal-clad laminate including the adhesive film, and a production method therefor. The present invention relates to an adhesive film including a polyimide film and an adhesive layer containing a thermoplastic polyimide, the adhesive layer being disposed on at least one surface of the polyimide film, a flexible metal-clad laminate produced by laminating a metal foil to the adhesive film with a thermal roll laminator, and a production method therefor, wherein the polyimide film is formed by a process including step (A) of mixing a polyamic acid solution, a dehydrating agent, and an imidization catalyst, and casting and applying the mixture onto a support to form a gel film; step (B) of stripping off the gel film and fixing both ends of the gel film; and step (C) of heating and transporting the film with both ends being fixed in a state loosened in the TD direction.
摘要:
A method for manufacturing a heat resistant flexible laminate effectively enabling avoidance of not only visual defects but occurrence of dimensional changes, and a heat resistant flexible laminate are provided. In a process for laminating a heat resistant adhesive material and a metallic foil by thermal lamination, a film-like protective material is disposed between a pressurized surface and the metallic foil at the time of thermal lamination. At this time, coefficients of linear expansion in a temperature range of 200 degree C. to 300 degree C. of the heat resistant adhesive material and the protective material are within a range of a coefficient of linear expansion of the metallic foil ±10 ppm/degrees C. Thereby, occurrence of visual defects is not only effectively avoidable, but excellent dimensional change after etching may be exhibited.
摘要:
A method for manufacturing a heat resistant flexible laminate effectively enabling avoidance of not only visual defects but occurrence of dimensional changes, and a heat resistant flexible laminate are provided. In a process for laminating a heat resistant adhesive material and a metallic foil by thermal lamination, a film-like protective material is disposed between a pressurized surface and the metallic foil at the time of thermal lamination. At this time, coefficients of linear expansion in a temperature range of 200 degree C. to 300 degree C. of the heat resistant adhesive material and the protective material are within a range of a coefficient of linear expansion of the metallic foil ±10 ppm/degrees C. Thereby, occurrence of visual defects is not only effectively avoidable, but excellent dimensional change after etching may be exhibited.
摘要:
A non-thermoplastic polyimide film exhibits high adherability without expensive surface treatment and is made from a precursor solution having high storage stability. The non-thermoplastic polyimide film comprises a non-thermoplastic polyimide resin having a block component derived from a thermoplastic polyimide. Preferably, the block component of the thermoplastic polyimide is present in an amount of 20 to 60 mol % of the entire polyimide so that the precursor solution thereof exhibits high storage stability and that the film can exhibit high adherability, in particular, high adherability to polyimide adhesives.
摘要:
A method for producing a heat-resistant flexible laminate in which appearance defects, such as wrinkles and waviness, can be prevented and dimensional stability can be improved is provided. A method for producing a flexible laminate including a heat-resistant adhesive film (A) and a metal foil (B) bonded to at least one surface of the heat-resistant adhesive film (A) includes a step of performing thermal lamination by passing the heat-resistant adhesive film (A) and the metal foil (B) between at least one pair of metal rollers through a protective film; a step of slowly cooling a laminate including the heat-resistant adhesive film (A), the metal foil (B), and the protective film; and a step of separating the protective film. The slow cooling step is preferably performed by providing a heating mechanism, in particular, a slow-cooling roller, of which temperature is set lower than the surface temperature of the metal rollers. The surface temperature of the slow-cooling roller is preferably set lower than the surface temperature of the metal rollers by 50° C. to 250° C.
摘要:
A non-thermoplastic polyimide film exhibits high adherability without expensive surface treatment and is made from a precursor solution having high storage stability. The non-thermoplastic polyimide film comprises a non-thermoplastic polyimide resin having a block component derived from a thermoplastic polyimide. Preferably, the block component of the thermoplastic polyimide is present in an amount of 20 to 60 mol % of the entire polyimide so that the precursor solution thereof exhibits high storage stability and that the film can exhibit high adherability, in particular, high adherability to polyimide adhesives.