International Business Machines Corporation

Ashit A Mehta

David W Wang

Eugene R Skarvinko

Jane M Shaw

Alfred Viehbeck

Jeffrey Curtis Hedrick

Elizabeth F Foster

Stephen L Tisdale

Ali Afzali-ardakani

Rodney T Hodgson

Shahrokh Daijavad

Steven E Molis

William J Summa

James L Hedrick, Jr

Bodil E Braren

Juan Ayala-Esquilin

Voya Rista Markovich

Konstantinos I Papathomas

Ralph S Paonessa

Lee P Springer

Carl E Diener

Jonathan David Reid

Charles Robert Davis

Jae M Park

Frederick R Christie

William H Lawrence

John M Brauer

Tyan M Niu

Lee P Wilding

A thermally stable photoimaging composition and a method of using the same, especially on circuit boards as a solder mask is provided. The composition includes a polymerizable resin or resin system, a cationic photoinitiator, a solvent, and an optically transparent ceramic filler. Preferably, the composition has a coefficient of thermal expansion of about 28-40 ppm/.degree.C., which closely matches the coefficient of thermal expansion of the solder used on the circuit board components.

Thermally stable photoimaging composition

A thermally stable photoimaging composition and a method of using the same, especially on circuit boards as a solder mask is provided. The composition includes a polymerizable resin or resin system, a cationic photoinitiator, a solvent, and an optically transparent ceramic filler. Preferably, the composition has a coefficient of thermal expansion of about 28-40 ppm/.degree. C., which closely matches the coefficient of thermal expansion of the solder used on the circuit board components.

Fillers coated with a fluorosilane coating are provided as well as compositions containing the coated fillers. Compositions are especially suitable for substrates for printed circuit boards and cards.

Coated filler and use thereof

Disclosed are structures comprising a composite of fluorinated particulate carbon dispersed in a polymer, the fluorinated carbon being present in an amount sufficient to reduce the dielectric constant of the composition, the structure also including electrical conductor patterns. The composite can be made conductive by irradiating it with an UV excimer laser.

Fluorinated carbon polymer composites

Disclosed is a process of effecting a change in the dielectric constant and coefficient of thermal expansion of a polyimide material, by forming a composite based on a dispersion of 2-60 wt. % of fluorinated particulate carbon material and a polyimide or polyimide precursor, and heating the dispersion to about 400.degree. C. at 65.degree.-200.degree. C./second.

Disclosed are thin film triazine adhesives on organic carriers, method for making them and microelectronic circuit packages incorporating them. The circuit package has a substrate made up of organic, dielectric, polymeric sheets. At least one pair of the polymeric sheets face each other and are adhesively joined together by a triazine polymer.

Triazine thin film adhesives

Disclosed are filled poly(triazine) resin dielectrics and microelectronic circuit packages incorporating them. In the filled poly (triazine) dielectric composites, dispersed thermoplastic polymeric fillers are used to reduce the brittleness and increase the ductility of the triazine polymer, while preserving the low dielectric constant of the triazine host matrix-based composite.

Mechanically enhanced, high impact strength triazine resins, and method

Disclosed is a polymeric product of diglycidyl bis phenol p-dialkyl benzene, and dicyanate diphenyl hexafluoro isopropane. Also disclosed is an organic polymeric dielectric composite of organic polymeric films, as polyimide films, dispersed in and reinforcing the organic polymeric adhesive reaction product of diglycidyl bis phenol p-dialkyl benzene, and dicyanate diphenyl hexafluoro isopropane. Further disclosed is an electronic circuit package that is adapted to receive at least one microelectronic circuit chip, with at least one layer having a substrate of an organic polymeric dielectric composite of organic polymeric films and the organic polymeric adhesive reaction product of diglycidyl bis phenol p-dialkyl benzene, and dicyanate diphenyl hexafluoro isopropane.

Adhesives on polymide films and methods of preparing them

Disclosed is a method of fabricating a multilayer electronic circuit package. The multilayer circuit package has at least one layer that is a circuitized, polymer encapsulated metal core. According to the method of the invention a metal foil is provided for the metal core of the layer. This metal core foil may be provided as a single unit or in a continuous, roll to roll, process. The vias and through holes are drilled, etched, or punched through the metal foil. An adhesion promoter is then applied to the perforate metal foil for subsequent adhesion of polymer to the foil. The dielectric polymer is then applied to the perforate metal foil core by vapor depositing, chemical vapor depositing, spraying or electrophoretically depositing, a thermally processable dielectric polymer or precursor thereof onto exposed surfaces of the perforate metal foil including the walls of the through holes and vias. The dielectric polymer or precursor thereof is then thermally processed to form a conformal dielectric, polymeric coating on surfaces of the perforate metal foil, including the interior surfaces of the vias and through holes. This dielectric, polymeric coating may then be circuitized, and coated with an adhesive for lamination to the next adjacent layer. After lamination, one or more chips are attached to the completed package.

Method for fabricating metal core layers for a multi-layer circuit board

Fluorinated polymeric composition exhibiting low dielectric constant and a low coefficient of thermal expansion containing a fluorinated polymeric material and a silica and/or quartz filler having a mean particle size of no greater than 7 microns, and use thereof to form a substrate having vias therein. Layers of the above composition are obtained by applying the composition to a substrate and then heating the composition to a temperature sufficient to cause the composition to fuse.

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Vestal, NY, United States of America

Ashit A Mehta