Abstract: MIM capacitors that are temperature and/or voltage independent, and a methodology for formulating the MIM capacitors for use in semiconductor integrated circuits, is provided. Vertical MIM capacitive structures include at least two vertically separated electrodes and a capacitor dielectric that includes portions of different dielectric materials provided in a desired area ratio. The disclosure provided for selecting dielectrics and dielectric thicknesses, determining an area ratio that produces temperature and/or voltage independent MIM capacitors, and forming capacitive devices with the desired area ratio. In one embodiment, the capacitor dielectric includes at least one SiO dielectric portion and at least one SiN dielectric portion and a total capacitive area includes the SiN and SiO dielectric portions arranged such that the ratio of the area of the SiO portions to the area of the SiN portions is about 1.15:1.

Abstract: A rigid improved penetration resistant composite of the type comprising a plurality of fibrous layers comprising network of fibers in a polymeric matrix selected from the group consisting of thermoplastic polymers, thermosetting resins or a combination thereof, at least two of said layers secured together by a securing means, said improvement comprising a securing means which comprises fiber stitches wherein the average stitch length is greater than the average stitch path, a process for forming the composite and articles fabricated from said composite.

Abstract: An article made from at least one network of high strength fibers and a matrix composition that includes a vinyl ester and diallyl phthalate. Preferably, the article is made from at least one prepreg element which includes at least two adjacent layers of the high strength fiber network in the vinyl ester-containing matrix composition. The prepreg element is made by applying a mixture of vinyl ester, diallyl phthalate and a carbon-carbon saturated solvent to the high strength fiber network.

Abstract: This invention relates to a carbon-carbon composite material formed by applying a vertical compressive force and a variable lateral force simultaneously to a mixture of carbon fiber and a carbon precursor material during carbonization of the mixture.

Abstract: An article made from at least one network of high strength fibers and a matrix composition that includes a vinyl ester and diallyl phthalate. Preferably, the article is made from at least one prepreg element which includes at least two adjacent layers of the high strength fiber network in the vinyl ester-containing matrix composition. The prepreg element is made by applying a mixture of vinyl ester, diallyl phthalate and a carbon-carbon saturated solvent to the high strength fiber network.

Abstract: An improved rigid composite of the type comprising a plurality of fibrous layers at least two of which are secured together by a securing means, said improvements comprising a securing means which comprises at least two adjacent paths.

Abstract: This invention relates to a fire resistant multilayer complex ballistic resistant article comprising at least one first layer comprised a plurality of flammable fibers a first matrix and at least one second layer which is adjacent to said first layer which comprises a plurality of fire resistant fibers in a second matrix, wherein the second matrix comprises a fire retardant material and is different from the first matrix material.

Abstract: A method of forming a carbon composite material by applying vertical compressive force and a variable lateral force simultaneously to a mixture of carbon fiber and a carbon precursor material during carbonization of the mixture.

Abstract: An impact resistant rigid composite article comprising a fibrous layer comprising a network of filaments dispersed in a rigid matrix comprising one or more thermosetting resins and one or more thermoplastic resins.

Abstract: The present invention is a flexible impact resistant article comprising a plurality of prepreg packets. Each prepreg packet comprises at least about 2 prepreg layers. Each prepreg layer comprises a plurality of coplanar fibers embedded in a polymeric matrix. There is a means to maintain at least a portion of each prepreg packet in successive layers. The prepreg packets are unattached to each other over a portion of their adjacent areas, preferably over a substantial portion of their adjacent areas. The plurality of packets results in improved flexibility.

Abstract: This invention relates to a fire retardant compound comprising at least one fibrous layer comprising a network of fibers such as high strength polyethylene or aramid fibers in a matrix such as a blend of a vinyl ester and a polyurethane, and a fire retardant layer comprised of a particulate fire retardant material which decompose an heating to a gaseous material such as magesium hydroxide dispersed in a matrix comprised of relatively high char yield resin such as cured phenolic cyanate resin.

Abstract: The present invention provides an improved composite which comprises one or more layers, at least one of said layers comprising network of high strength filaments having a tensile modulus of at least about 160 grams/denier, a tenacity of at least about 7 g/denier and an energy-to-break of at least about 8 joules/gram in a matrix material, the ratio of the thickness of said layer to the equivalent diameter of said filaments is equal to or less than about 12.8, and complex composite articles formed from said composite.

Abstract: A device for forming a resin impregnated unidirectional fiber reinforced prepreg where the resin impregnated fiber web is supported by a single endless conveyor belt. The device includes a pair of pull rolls which exert force directly and longitudinally onto the conveyor belt and the web.

Abstract: A method of making a composite of a unidirectional fibrous web in a polymer matrix composition by nonuniformly feeding a polymer composition into contact with a unidirectional fibrous web into a gap between two adjacent compression surfaces with at least one of the surfaces having a pattern. This results in the polymer becoming nonuniformly distributed into thick areas and thin areas as a matrix for the fibrous web.

Abstract: The present invention is a composite comprising a fibrous web and a matrix composition nonuniformly distributed in the major plane of a fibrous web.

Abstract: An improved moving cavity yarn texturing device is described. One improved feature is a two stage energy tube which provides for more effective filling of the moving cavity by the yarn. The first stage has a cross section with a major axis an a minor axis. The second stage has a cross section with a major axis and a minor axis whose ratio is less than that of the first stage. A second feature is an improved chamber design which employs a channel having a "V" shaped cross section which eliminates snagging of the yarn by the cavity.

Abstract: The present invention provides an improved composite which comprises one or more layers, at least one of said layers comprising network of high strength filaments having a tensile modulus of at least about 160 grams/denier, a tenacity of at least about 7 g/denier and an energy-to-break of at least about 8 joules/gram in a matrix material, the ratio of the thickness of said layer to the equivalent diameter of said filaments is equal to or less than about 12.8, and complex composite articles formed from said composite.

Abstract: A tow of continuous filaments is fed by aspiration into a stream of compressible fluid. The stream containing the filaments is directed into contact with a barrier disposed within a chamber at a force sufficient to initiate crimping of the filaments. A major portion of the compressible fluid is separated from the filaments and expelled from the chamber. The filaments are transported through the chamber by continuous movement of a surface therein at sufficient velocity to cause overfeeding of the filaments, whereby the filaments are forced against a mass of the tow and emerge from the chamber in crimped form.

Abstract: An improved moving cavity yarn texturing device is described. One improved feature is a two stage energy tube which provides for more effective filling of the moving cavity by the yarn. The first stage has a cross section with a major axis and a minor axis. The second stage has a cross section with a major axis and a minor axis whose ratio is less than that of the first stage. A second feature is an improved chamber design which employs a channel having a "V" shaped cross section which eliminates snagging of the yarn by the cavity.

Abstract: A method of forming foamed fibers which comprises the steps of forming a melt of a polymer of fiber-forming molecular weight in which is admixed a blowing agent, and a closed-cell-forming additive, extruding said melt through a spinnerette, quenching said melt downstream of said spinnerette under conditions at which bubbles form in said melt, and drawing said melt as it is quenched to produce a foamed fiber having fine bubbles contained therein is disclosed. The product fibers may contain substantially only closed-cells and/or substantially uniform cross sectional area cells.