Abstract:
A heat-resistant fibrous paper which is formed mainly from short fibers made of a heat-resistant organic polymer, short fibers made of an unstretched or lowly stretched para-aromatic polyamide, and an organic resin binder and/or fibrids made of a heat-resistant organic polymer, wherein the amount of the short fibers is 45 to 97 wt.% based on the whole paper, the amount of the organic resin binder and/or the fibrids is 3 to 55 wt.%, and the organic resin binder has been cured and/or the short fibers of an unstretched or lowly stretched para-aromatic polyamide and the fibrids were partly softened and/or deformed and melted to make them serve as a binder. This heat-resistant fibrous paper is excellent in heat resistance, thermal dimensional stability, interlaminar peel strength, electrical insulating properties in a high-humidity atmosphere, etc. and can be satisfactorily impregnated with a resin despite its high bulk density. It is especially suitable for use as a substrate for electrical insulating materials or a substrate for layered products for electrical circuits.
Abstract:
The invention aims at providing a resin composition for electronic parts which is in great demand as a circuit board material for electric and electronic equipments, and which has a low dielectric constant, low dielectric dissipation factor and a thermal resistance. This resin consists of a thermoplastic resin or a thermosetting resin, and wollastonite or zonotolite, fibrous material containing CaO.SiO2 as a main component, mixed as reinforcing fiber with the resin at a mixing ratio of 5-60 % based on the total weight of the resin and fiber.
Abstract:
A prepreg comprising a semi-cured thermosetting resin and electrically insulating whiskers or electrically insulating short fibers dispersed in the semi-cured thermosetting resin and, if necessary, the prepreg being provided on a carrier film is suitable for producing multi-layer printed circuit boards of reduced thickness, high wiring density and high connection reliability with high productivity and low production cost.
Abstract:
An electrical circuit material is presented which comprises:
(a) a thermosetting composition comprising a polybutadiene or polyisoprene resin and an unsaturated butadiene or isoprene containing polymer capable of participating in crosslinking with said polybutadiene or polyisoprene resin in an amount of from 25 to 50 volume percent; (b) a woven fabric in an amount from 10 to 40 volume percent; (c) a particulate filler in an amount of from 5 to 60 volume percent; and (d) a free radical cure initiator.
Abstract:
A molding capable of forming a precision fine-line circuit by the subtractive method is produced from a liquid-crystal polyester resin composition comprising a melt-processable polyester (liquid-crystal polyester) capable of forming an anisotropic molten phase and an inorganic filler added thereto, the molded composition is etched and a metallic coating is then formed on the etched surface by sputtering, ion plating or vacuum deposition.
Abstract:
A process for producing a printed circuit board is disclosed, in which the following steps are sequentially conducted:
(1) a step for dispersing in at least one of the mediums of water and an organic solvent
(A) 95 to 20% by weight of a styrene polymer having a syndiotactic structure, (B) 5 to 80% by weight of a fibrous filler having a fiber length of 1 to 50 mm, and (C) 0.1 to 30 parts by weight of at least one of a binder and a binding fiber in proportion to 100 parts by weight of the total amount of said components (A) and (B), to make a slurry having a concentration of 0.5 to 100 g/l,
(2) a sedimentation step of the dispersed solids in said slurry, (3) a step for removing at least one of the mediums of water and an organic solvent in the slurry by filtration and drying and molding the residue, (4) a step for melting with heating and pressure forming the molded product, and (5) a step for providing a metal layer on the molded article.
The printed circuit board obtained by the process is excellent in impact resistance, heat resistance, mechanical strength and size stability as well as dielectric properties.
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.
Abstract:
A molding capable of forming a precision fine-line circuit by the subtractive method is produced from a liquid-crystal polyester resin composition comprising a melt-processable polyester (liquid-crystal polyester) capable of forming an anisotropic molten phase and an inorganic filler added thereto, the molded composition is etched and a metallic coating is then formed on the etched surface by sputtering, ion plating or vacuum deposition.
Abstract:
A fluoropolymeric circuit laminate consisting of one or more layers of fluoropolymer impregnated woven glass cloth (18) sandwiched between one or more layers (14,16) of "random" microfiberglass reinforced fluoropolymer is presented. This composite of fluoropolymer, woven glass fabric and random glass microfibers may be clad on one or both outer surfaces with a suitable conductive material (20,22) such as copper or certain known resistive foils.
Abstract:
Laminés de polymère/métal ainsi qu'un procédé de fabrication utilisant un métal ouvré, lisse, non traité conférant au laminé obtenu des caractéristiques de résistance à la cohésion et à l'adhésion.