Abstract:
The invention concerns a composition which may be used to form a temporary conductor or resistor, for example, by screen printing onto selected parts of an electrical circuit and peeled off when desired. The composition comprises vinylic resin, wax, solvent, and conductive and/or semiconductive particles.
Abstract:
A solderable electrically conductive film is formed on a substrate by forming a film-forming composition comprising polyimide, solvent therefor and dispersed metallic nickel particles. This composition is applied to the substrate, dried and cured to leave the film which comprises nickel particles dispersed in polyimide.
Abstract:
The invention concerns a coating composition which may be used to form a peelable solder mask. The coating composition comprises a mixture of vinylic resin, microcrystalline wax and solvent. Applied as a film coating, the coating composition can be used to provide a temporary mask to selected areas of a substrate, for example, a printed circuit, prior to exposure to a solder flux, the mask being readily peelable from the substrate.
Abstract:
This invention provides solderable, flexible, conductive compositions which may be bonded directly to substrates. The conductive compositions comprise silver, substantially in the form of flake, and resin system, said resin system comprising vinyl chloride/vinyl acetate copolymer, epoxy resin and epoxy hardener. Also provided are methods of preparing compositions useful in forming conductive compositions. Once cured, the conductive compositions may demonstrate good adhesion directly to a substrate in addition to excellent conductivity, solderability and felxibility characteristics.
Abstract:
This invention is concerned with directly solderable conductive compositions which may be bonded directly to substrates. The conductive compositions comprise silver, substantially in the form of flake, and resin system, said resin system comprising phenolic resin, acrylic resin, polyurethane resin, vinyl chloride/vinyl acetate copolymer, epoxy resin and epoxy hardener. This invention is also concerned with compositions useful in forming conductive compositions and the coating of at least a portion of the surface of substrates with conductive compositions.
Abstract:
This invention is concerned with solderable conductive compositions. These compositions comprise metal and/or alloy thereof coated with one or more saturated monocarboxylic acid, the coated metal and/or alloy thereof being dispersed in organic polymeric matrix. Also disclosed is a method for preparing such solderable conductive compositions, and a method of coating metal and/or alloy thereof with one or more saturated monocarboxylic acid.
Abstract:
The invention concerns a coating composition which may be used to form a peelable solder mask. The coating composition comprises a mixture of vinylic resin, microcrystalline wax and solvent. Applied as a film coating, the coating composition can be used to provide a temporary mask to selected areas of a substrate, for example, a printed circuit, prior to exposure to a solder flux, the mask being readily peelable from the substrate.