摘要:
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.
摘要:
One aspect of the present invention is a prepreg for an electronic support, the prepreg comprising: (a) a polymeric matrix material; and (b) a fabric comprising a strand comprising glass fibers, at least a portion of the fabric having a coating which is compatible with the polymeric matrix material, the prepreg having a drill tip percent wear of no greater than about 32 percent, as determined after drilling 2000 holes through a stack of 3 laminates, each laminate including eight of the prepregs, at a hole density of 62 holes per square centimeter (400 holes per square inch) and a chip load of 0.001 with a 0.46 mm (0.018 inch) diameter tungsten carbide drill. The present invention also provides a laminate incorporating the prepreg. Another aspect of the present invention is a prepreg for an electronic support, the prepreg comprising: (a) a polymeric matrix material; and (b) a woven reinforcement fabric comprising glass fibers, at least a portion of the fabric having a coating which is compatible with the polymeric matrix material, the prepreg having a deviation distance of no greater than about 36 micrometers, as determined after drilling 2000 holes through a stack of 3 laminates at a hole density of 62 holes per square centimeter (400 holes per square inch) and a chip load of 0.001 with a 0.46 mm (0.018 inch) diameter tungsten carbide drill. The present invention also provides a laminate incorporating the prepreg.
摘要:
The invention relates to a semiconductor component in a chip format, comprising a chip with at least one first insulating layer (3) and electric contact surfaces (2) devoid of said insulating layer. Conductors (5) run from the electric contact surfaces (2) to the foot areas (10) of external connection elements (12) along the insulating layer (3). Another insulating layer (8) is also provided with through openings (9) leading from the outside to the foot areas (10) of the external connection elements (12). A conductive adhesive (11) is placed in said openings (9) and metallic globules (12) are placed at least on the outside thereon. The semiconductor element can also contain a solder paste instead of the conductive adhesive in the through openings (9), whereby the metallized synthetic globules are placed thereon. The invention also relates to a method for producing the semiconductor element thus described.
摘要:
Epoxy laminates, e.g., CEM-1 laminates, include polymeric particles, particularly core-shell particles having an average diameter of about 0.05 to 30 mu m, which reduce the dust produced during manufacture of printed circuit boards.
摘要:
High-speed interconnects for printed circuit boards and methods for forming the high-speed interconnects are described. A high-speed interconnect may comprise a region of a conductive film having a reduced surface roughness and one or more regions that have been treated for improved bonding with an adjacent insulating layer. Regions of reduced roughness may be used to carry high data rate signals within PCBs. Regions treated for bonding may include a roughened surface, adhesion-promoting chemical treatment, and/or material deposited to improve wettability of the surface and/or adhesion to a cured insulator.
摘要:
The invention relates inter alia to a method for producing an arrangement, in which (a) a first electrical component (60) is arranged on a first carrier (10), (b) a second electrical component (260) is arranged on a second carrier (200) and (c) the two carriers are connected to one another, wherein the sequence of steps (a) to (c) is arbitrary. According to the invention, the two carriers are adhesively bonded to one another with an adhesive (310) containing electrically conductive particles (300) so as to form an anisotropically conductive adhesive layer (320), wherein the adhesive layer is used to produce an electrical connection between at least one electrical contact surface (80) on the first carrier and at least one electrical contact surface (240) on the second carrier.