Abstract:
A coating layer of a polymer capable of forming an optically anisotropic melt phase is formed by heat-pressing to a base material a film made of the polymer and having a segment orientation ratio of not greater than 1.3 and then separating the film into two halves so as to leave one of the halves on the base material, thereby obtaining a coated material made of the base material and the thin coating layer.
Abstract:
Disclosed is a metal-clad laminate product having a carrier film, a aqueous soluble release or parting layer deposited onto the carrier film and which can be mechanically separated from the carrier film, and an ultra thin metal layer deposited onto the parting layer. Also disclosed is a method for making the metal-clad laminate product.
Abstract:
An insulating adhesive for a multilayer printed circuit board, which is to be laminated to an internal layer circuit board coated with an undercoating agent comprising an epoxy resin and a curing agent therefor, and which comprises as essential components:(a) a bisphenol type epoxy resin or phenoxy resin having a weight average molecular weight of at least 10,000,(b) a bisphenol type epoxy resin having an epoxy equivalent of not more than 500, and(c) an epoxy resin curing agent, said insulating adhesive being excellent in storage stability in the form of a varnish or as coated on a copper foil, and when coated on an internal layer circuit board coated with an undercoating agent, being able to be well integrally cured with the undercoating agent.
Abstract:
A resin composition comprising (a) an epoxy resin having a number average molecular weight of 1200 or less, (b) a carboxylic acid-containing acrylic or acrylonitrile-butadiene rubber, (c) a curing agent for the epoxy resin, and (d) a curing accelerator is easily chemically etched and suitable as an insulating adhesive for producing multilayer printed circuit boards.
Abstract:
A multilayer printed circuit board small in interlayer thickness, capable of fine wiring, minimized in IVH and BVH diameters, high in strength and also excellent in wire bonding workability can be produced by a process comprising the steps of coating a thermosetting resin varnish compounded with electrically insulating whiskers on a roughened side of a copper foil, semi-curing the resin by heating to form a thermosetting resin layer, integrally laminating it on an interlayer board in which plated through-holes and conductor circudits have been formed, and roughening the cured thermosetting resin layer on the via hole wall surfaces with a roughening agent.
Abstract:
A process for producing a multilayer printed circuit board which comprises coating a light and heat curable undercoating agent on an internal layer circuit board, irradiating the undercoating agent with active energy beams to make the same tack-free, then laminating thereto a metal foil having an insulating adhesive layer and subsequently heating the resulting assembly to integrally cure the same. When the undercoating agent is coated on an internal layer circuit board and irradiated with a light to be made tack-free, and thereto is laminated a copper foil having a thermosetting insulating adhesive by a rigid roll or the like, the undercoating agent is softened or fluidized and the surface is smoothened. When the resulting laminate is thereafter heated, the undercoating agent coated on the internal layer circuit board and the insulating adhesive coated on the copper foil are integrally cured. Since the insulating adhesive coated on the metal foil keeps the thickness, a multilayer printed circuit board having an excellent board thickness precision can be produced without depending on the percentage of the remaining copper foil in the internal layer.
Abstract:
An undercoating agent for a multilayer printed circuit board which comprises: (a) a normally solid epoxy resin having a softening point of 45.degree. to 120.degree. C., (b) an epoxy resin curing agent, (c) a diluent in which the epoxy resin is dissolved and which consists of a photopolymerizable monomer, and (d) a photopolymerization initiator, said undercoating agent being effectively used in the production of a multilayer printed circuit board which utilizes making the undercoating agent tack-free by irradiation with active energy beams and the main curing of the undercoating agent by heating.
Abstract:
An adhesive composition and foils coated with the adhesive, wherein the adhesive consisting essentially of: (I) a fist amount of a non-modified epoxy resin and a second amount of a rubber-modified epoxy resin in a total amount of 60-100 parts by weight, wherein the amount of rubber-modified epoxy resin is 0.5 to 20 parts by weight; (II) 5-30 parts by weight of a polyvinyl acetal resin; and optionally contains (III) at least one resin selected rom the group consisting of blocked isocyanate resins, polyester resins, polyester resins, melamine resins and urethane resins. The adhesive coating can optionally contain inorganic fillers, fire retardants, and curing agents.
Abstract:
A printed circuit board and method of manufacture thereof is disclosed. The printed circuit board includes a first substrate provided from a conductive layer having disposed on a first surface thereof a cured adhesive layer, A semi-cured adhesive layer is then disposed over the cured adhesive layer and a second substrate is disposed against the semi-cured adhesive layer.
Abstract:
Provided is a method for making a multilayer printed circuit board having blind holes which comprises heat laminating a copper foil and an inner layer panel previously provided with circuit patterns on one or both sides thereof by processing a copper-clad laminate, a resin layer soluble in an aqueous alkali solution and having a flowability upon heating being present between said copper foil and said inner layer panel, forming via holes in the surface copper foil by etching and then dissolving the resin layer under said via holes with an aqueous alkali solution and removing the resin layer, thereby to form blind holes in which the copper foil on the inner layer panel is exposed. Further provided is a copper foil used for making multilayer printed circuit boards, which is provided with a resin layer soluble in an aqueous alkali solution and having flowability upon heating on its roughened surface.