Flame-proof flexible printed circuit board
AssigneeNippondenso Co., Ltd.
InventorsTakashi Hiraiwa, Yuichi Fujita
Life of this patent
Estimating the term…
Abstract
A flexible printed circuit board having excellent flame proofness and a very little danger of causing a fire can be produced by subjecting a substrate or an insulating film consisting of a flexible resin film to surface treatment to provide a surface tension of 36 dyne/cm or more and then forming a resin film containing a flame retardant on the treated surface of said substrate or insulating film.
Claims13
A flexible, fire-resistant printed circuit board comprising
- a copper foil defining an electric circuit, and
- a flexible resin film adhered to one surface or both surfaces of said copper foil with an adhesive, said flexible resin film selected from the group consisting of polyester, polyvinyl chloride, polypropylene, polyethylene, polyamide and polyimide,
- wherein said flexible resin film prior to adherence being subjected to a surface treatment to provide a surface tension of from 36 to 60 dynes/cm thereon, and a resin film containing a flame retardant is then formed on the treated surface of said flexible resin film.
A flexible, fire-resistant printed circuit board having a flexible resin film substrate adhered with an adhesive to one surface of a copper foil defining an electric circuit, said flexible resin film selected from the group consisting of polyester, polyvinyl chloride, polypropylene, polyethylene, polyamide and polyimide the surface of said flexible resin film substrate prior to adherence being subjected to a surface treatment to provide a surface tension of from 36 to 60 dynes/cm, a resin film containing a flame retardant formed on the thus treated surface of said flexible resin film, and an ink film containing a flame retardant formed on the other surface of said copper foil.
A flexible, fire-resistant printed circuit board comprising a copper foil defining an electric circuit adhered to a flexible resin film substrate with an adhesive containing a flame retardant, the surface of said flexible resin film prior to adherence being subjected to a surface treatment to provide a surface tension of from 36 to 60 dynes/cm thereon, and a resin film containing a flame retardant subsequently formed on the thus treated surface of said flexible resin film wherein said flexible resin film selected from the group consisting of polyester, polyvinyl chloride, polypropylene, polyethylene, polyamide and polyimide.
A flexible, fire-resistant printed circuit board wherein one surface of a flexible resin film is subjected to a surface treatment to provide a surface tension of from 36 to 60 dynes/cm thereon, a resin film containing a flame retardant formed on the thus treated surface of said flexible resin film, a copper foil defining an electric circuit adhered to the other surface of said flexible resin film with an adhesive containing a flame retardant, and an ink film is formed on the other surface of said copper foil and wherein said flexible resin film selected from the group consisting of polyester, polyvinyl chloride, polypropylene, polyethylene, polyamide and polyimide.
A flexible, fire-resistant printed circuit board including the sequential layers of
- (1) a flame-retardant coating film coated on one side of a flexible substrate;
- (2) a flexible resin film substrate having two surfaces, the surfaces having the flame-retardant resin film thereon having a surface tension of between 36 and 60 dynes/cm, said flexible resin film selected from the group consisting of polyester, polyvinyl chloride, polypropylene, polyethylene, polyamide and polyimide, the opposite surface having;
- (3) an adhesive thereon adhering the flexible resin film to a copper foil layer;
- and
- (4) A copper foil layer in the form of an electric circuit adhered to the flexible resin film substrate,
- the flexible, fire-resistant printed circuit board having a burning rate of not greater than 10 cm/min and a burning distance of not greater than 10 min both as measured by MVSS test No. 302.
Dependencies are inferred from the claim text.