Abstract:
The present invention provides an at least partially coated fiber strand comprising a plurality of fibers, the coating comprising an organic component and lamellar particles having a thermal conductivity of at least 1 Watt per meter K at a temperature of 300K. The present invention also provides an at least partially coated fiber strand comprising a plurality of fibers, the coating comprising an organic component and non-hydratable, lamellar particles. The present invention further provides an at least partially coated fiber strand comprising a plurality of fibers having a resin compatible coating composition on at least a portion of a surface of at least one of said fibers, the resin compatible coating composition comprising: (a) a plurality of discrete particles formed from materials selected from non-heat expandable organic materials, inorganic polymeric materials, non-heat expandable composite materials and mixtures thereof, the particles having an average particle size sufficient to allow strand wet out; (b) at least one lubricious material different from said plurality of discrete particles; and (c) at least one film-forming material. The present invention also provides an at least partially coated fiber strand comprising a plurality of glass fibers having a resin compatible coating composition on at least a portion of a surface of at least one of said glass fibers, the resin compatible coating composition comprising: (a) a plurality of lamellar, inorganic particles having a Mohs' hardness value which does not exceed the Mohs' hardness value of said glass fibers; and (b) at least one polymeric material. The present invention further provides an at least partially coated fiber strand comprising a plurality of glass fibers having a resin compatible coating composition on at least a portion of a surface of at least one of said glass fibers, the resin compatible coating composition comprising: (a) a plurality of hollow, non-heat expandable organic particles; and (b) at least one lubricious material different from the at least one hollow organic particle.
Abstract:
Reworkable adhesive that has a high shear strength through a range of use temperatures but which has a low strength and is reworkable at a suitable processing.
Abstract:
This invention relates to an adhesive composition, comprising: (A) at least one multifictional epoxy; and (B) the composition derived from (B-1) at least one difunctional epoxy resin and (B-2) at least one compound represented by the formula
R-(G) n (I)
wherein in Formula (I): R is an aromatic, alicyclic or heterocyclic group; G is a functional group selected from the group consisting of COOH, OH, SH, NH₂, NHR¹, (NHC(=NH)) m NH₂, R²COOH, R²OH, R²SH, R²NH₂ and R²NHR¹, wherein R¹ is a hydrocarbon group, R² is an alkylene or alkylidene group and m is a number in the range of 1 to about 4; and n is a number ranging from 3 up to the number of displaceable hydrogens on R; with the proviso that when at least one G is NH₂ or R²NH₂, n is a number ranging from 2 up to the number of displaceable hydrogens on R, and when at least one G is (NHC(=NH)) m NH₂, n is a number ranging from 1 up to the number of displaceable hydrogens on R. The invention also relates to copper foils having the foregoing adhesive composition adhered to at least one side thereof to enhance the adhesion between said foils and dielectric substrates. The invention also relates to laminates comprising copper foil, a dielectric substrate, and an adhesion-promoting layer comprising the foregoing adhesive composition disposed between and adhered to the foil and the substrate.
Abstract:
Adhésif recyclable présentant une résistance élevée au cisaillement dans une plage de températures d'utilisation, mais présentant une faible résistance et pouvant être recyclé à une température de traitement appropriée.
Abstract:
The invention relates to a polymeric base material which is catalytic for metal deposition. The base material comprises a first catalyst comprising a particulate silicate filler dispersed in the polymeric base material and an aromatic moiety having a hydroxyl substituent dissolved in or attached to the polymers of the polymeric base material. The polymeric base material optionally includes a second catalyst for metal deposition selected from the group of noble metals and noble metal compounds. In one aspect, the base material is a laminate comprised of glass cloth prepregs. The impregnating varnish comprises an epoxy resin, a silicate filler, and a curing agent for the epoxy resin, the curing agent being selected from the group consisting of phenolic resins and aromatic compounds having at least one hydroxyl group on the aromatic ring and mixtures of such curing agents. In yet another aspect, the invention comprises printed wiring boards having plated-through holes produced on the above base materials. The walls of the plated-through holes are plated with a copper deposit in which the sum of the thermal expansion and the strain at the elastic limit is approximately the same as the thermal expansion of the thickness of the base material.
Abstract:
A thermosetting resin composition suitable for forming an insulating layer to be interposed between two adjacent wiring patterns of a multilayer printed wiring board is disclosed which includes a bisphenol AD epoxy resin, an aromatic polyamine, mica having an average particle size of 50 µm or less, and silica having an average particle size of 20 µm or less, the average particle size of the silica being smaller than that of the mica, and the amount of the silica being 20-80 % based on the total weight of the silica and the mica.
Abstract:
Here is disclosed a glass fiber product for use in the reinforcement of fluororesin which is improved in the adhesiveness to fluororesin. Thus, a glass fiber product for use in the reinforcement of fluororesin pre-treated with perfluoroalkylsilane represented by the following formula: CF₃-CH₂-CH₂-SiX₃ (X is a hydrolyzable group such as alkoxy groups having 1 to 4 carbon atoms) retains an excellent electrical insulation resistance.