Abstract:
An electrical substrate material is presented comprising a resin matrix which includes a thermosetting polybutadiene or polysoprene resin, and ethylene propylene rubber, and optionally a thermoplastic unsaturated butadiene- or isoprene-containing polymer; a particulate filler, a flame retardant addititive, a curing agent, and a woven or unwoven fabric. The presence of the ethylene propylene rubber enhances the heat age properties of the substrate material, particularly the dielectric strengh and the mechanical properties, while other electrical, chemical, and mechanical properties of the material are not adversely effected.
Abstract:
This invention concerns electronic substrates comprising a non-woven filler material cousisting primarily of micro-fiber glass, and a resin material. The present invention also includes electronic products manufactured from the electronic substrates of this invention including, but not limited to prepregs (16, 18), metal clad laminates, and printed wiring boards with and without lased via holes (20). The present invention further includes a method of manufacturing printed built-up wiring boards including the steps of forming a prepreg (16, 18) and forming at least one via (20) in the prepreg (16, 18).
Abstract:
A printed circuit board includes a substrate and a circuit. The substrate is a layer of a ceramic substance, and the circuit is arranged on at least one surface of the substrate. The layer of the ceramic substance includes a non-woven mat of particles of the ceramic substance, and the non-woven mat has a relative density of 25% or less in comparison with the bulk density of the ceramic substance. Also, the invention relates to a method for manufacturing such a printed circuit board.
Abstract:
The invention relates to a composite material consisting of at least one ceramic layer or at least one ceramic substrate and at least one metallisation formed by a metallic layer on a surface side of the at least one ceramic substrate.
Abstract:
The present invention comprises microfiller-reinforced polymer films. Microfiller-reinforced polymer films are films having high aspect-ratio fillers incorporated therewith, which filler have a minor dimension less that 20 μm and a major dimension at least three times greater than the minor dimension.
Abstract:
A printed circuit board is made from at least one non-woven sheet or web layer comprising at least 50 % by weight acrylic fibers, with any balance substantially electrically non-conductive fibers, filler, and binder. The sheet or web is preferably made by the foam process, and may contain 60-80 % straight polyacrylonitrile fibers and 40-20 % fibrillated (pulp) ones. The web or sheet is preferably compressed by thermal calendering so that it has a density of about 0.1-1 grams per cubic centimeter; and the web or sheet may have a basis weight of between about 20-120 grams per square meter. The web or sheet may also have a 1-40 % of substantially electrically non-conductive organic or inorganic binder, or may be substantially binder free. A printed circuit board made using the layers of these non-woven webs or sheets is otherwise conventional, including a pre-preg material, electrically conductive circuit elements, and electronics, and has improved properties compared to woven glass and non-woven aramid products, including improved fiber consolidation, easy board construction, and improved MD/CD ratio and stability.
Abstract:
Polymer/metal laminates and a method for their manufacture employing smooth, untreated, wrought-metal and characterized by cohesive and adhesive strength in the resulting laminates.