Abstract:
The present invention relates to a conductive paste in which fine metal particles are dispersed into a chemical adsorption liquid produced from a mixture of at least an alkoxysilane compound, a silanol condensation catalyst, and a nonaqueous organic solvent to form an organic thin film comprising molecules covalently bound to the surface of the fine metal particle by having the surface of the fine metal particle react with the alkoxysilane compound, so that fine metal particles that are given a reactive function to the surface are produced while almost maintaining the original conductivity of the fine metal particles, and further the particles are pasted with an organic solvent.
Abstract:
An application of the epoxy-AlN composite material in the preparation of the high density PCB. The epoxy-AlN composite material is manufactured by the following process: pre-treating the surface of the AlN powder by a coupling agent; adding a solvent to the AlN powder, then stirring the obtained solution with an ultrasonic agitator; mixing the AlN solution and the epoxy system so sufficient as to obtain a uniform dispersant; injecting the dispersant into a mould, then drying it in vacuum. The grain diameter of the AlN powder is 10nm-50µm, and the weight of the AlN powder is 5-70 wt% of the weight of the composite material .
Abstract:
A two component solder resist coating wherein a first component comprising a partial hydrolyzate of an alkoxysilane compound and an organic solvent and a second component comprising a titanium alkoxide and an organic solvent are mixed and cured, characterized in that the first component and/or the second component contain a potassium titanate fiber; a solder resist cured product formed from the coating; and a printed wiring board having a coating film prepared by forming a pattern using the coating and then curing the pattern. Said solder resist coating may further contain, in the first component and/or the second component, at least one selected from among a kaolin powder, an alumina powder and an aluminum hydroxide powder having been treated with a coupling agent, a fumed silica powder having been subjected to a surface treatment for imparting hydrophobicity, an ethyl cellulose powder, a blue pigment containing no halogen atom and/or a yellow pigment containing no halogen atom.
Abstract:
The invention relates to a PCB blank comprising a protective film which is resistant to acid and which is made of at least two layers which are chemically linked to each other underneath each other and/or are linked to the metal surface of the PCB blank. The invention also relates to a method for coating a PCB blank with a protective film which is resistant to acid and which is made of at least two layers.
Abstract:
The present invention provides a coated fiber strand comprising at least one fiber having a layer of a dried residue of a resin compatible coating composition on at least a portion of a surface of the at least one fiber, the resin compatible coating composition comprising: a) a plurality of discrete, dimensionally stable particles formed from materials selected from the group consisting of organic materials, polymeric materials, composite materials and mixtures thereof that provide an interstitial space between the at least one fiber and at least one adjacent fiber, the particles having an average particle size of about 0.1 to 5 micrometers; b) at least one lubricious material; c) at least one polymeric film former; and d) at least one coupling agent, and a fabric incorporating at least one of the fiber strands.
Abstract:
A new and improved laminated microwave circuit material (10) comprises a non-woven glass web (5 to 20 vol. %) impregnated with a cyanate ester resin (35 to 68 vol. %) and filled with a low dielectric constant (e.g., silica), high dielectric constant (e.g., titania) filler or other suitable ceramic particulate filler (25-55 vol. %). Intermediate values of dielectric constant may be achieved by filler mixtures of silica, titania and other suitable fillers. Preferably, the filler is coated with a material which renders the filler hydrophobic such as silane, titanate or zirconate coatings. This microwave circuit material (10) of the present invention is preferably formulated to be flame retardant and has many features and advantages relative to prior art and microwave materials including prior art cyanate ester/woven glass materials. For example, the combination of resin, non-woven glass web and filler provides a low dissipation factor (Df) of less than 0.008 thereby permitting the material of the present invention to be used in rellatively demanding consumer and commercial applications (and some less demanding military applications).