Abstract: A process for producing a composite part comprising:(i) putting short reinforcing fibers into a transfer mold;(ii) impregnation said short reinforcing fibers with a low viscosity resin;(iii) maintaining said short reinforcing fibers impregnated with by said resin in said transfer mold at a first temperature T.sub.1 known as the gelation temperature until a pasty preform is obtained whose viscosity is suitable for compression molding;(iv) removing said pasty preform from the mold;(v) placing said pasty preform in a compression mold brought to a second temperature T.sub.2, known as the compression temperature, wherein T.sub.2 >T.sub.1 ;(vi) compression molding said pasty preform; and(vii) polymerizing said pasty preform at at least a third temperature T.sub.3 wherein T.sub.3 .gtoreq.T.sub.2.

Abstract: Chemorheologically viscosity tailored matrix resin formulations for use in forming prepregs and composite articles are disclosed. These formulations have a specified viscosity profile obtained from a curable matrix resin and an effective amount of a reactive resin curing agent reactive at room temperature and a latent resin curing agent substantially nonreactive at room temperature. The latent resin curing agent is activated upon heating or radiation. The matrix resin formulation is adapted upon formulation to have a viscosity sufficiently low enough to enable the matrix resin to impregnate fibers or broadgoods at room temperature without the necessity for the application of heat or solvent and which, upon standing at room temperature after impregnation into the fibers or broadgoods to form a prepreg composition, rises in viscosity.

Abstract: The present invention is directed to impact resistant or toughened phenolic based resin blends impregnated into a graphite fiber substrate to make a prepreg. The prepreg is used to fabricate storage bins for the transportation industry.

Abstract: The invention is directed to a composition of matter useful as a paper impregnant, to the method of its use, and to the products produced by the method. Poly (diphenylmethane diisocyanate) or PMDI has been used in the past as a paper impregnant with or without propylene carbonate as a diluent. These products have generally required pressing under high pressures and at elevated temperatures. It has now been found that triacetin and/or triethyl citrate in usages up to about 20% of PMDI give superior performance in impregnated products. The modified PMDI will cure at essentially ambient conditions in times as short as 1-2 days to insoluble polyureas with low residual amounts of isocyanates and reaction byproducts such as 4,4'-diaminodiphenylmethane. The treated papers can be used in applications of which skins for sandwich panels and high strength corrugated board would be exemplary.

Abstract: Multidimensional oligomers of the present invention are surprisingly useful for advanced composites because each generally has a use temperature greatly in excess of its curing temperature. The oligomers have essentially no arms, and comprise crosslinking phenylimide end caps condensed directly onto an aromatic hub (preferably, phenyl) through "commodity" polymeric linkages, such as amide, diimide, ether, or ester. For example, p-nadicimidobenzoylchloride can be condensed with triaminobenzene to yield a multidimensional, crosslinking amide oligomer. Short chains of ether/carbonyl aromatic chains can be included, if desired. Methods for making these high-performance oligomers with ether/carbonyl aromatic chains use an Uhlman ether synthesis followed by a Friedel-Crafts reaction.

Abstract: Aromatic copolyamides, production thereof, formed structures and production thereofDescribed are aromatic copolyamides comprising the structural repeat units of the formulae I, II and III ##STR1## where Ar.sup.1, Ar.sup.2, Ar.sup.3 and Ar.sup.

Abstract: A potassium hexatitanate whisker having a tunnel structure containing aluminum and niobium impurities in such amounts that Al.sub.2 O.sub.3 /Nb.sub.2 O.sub.5 molar ratio is 0.6 or higher and composite materials using the same. Also disclosed are processes for producing composite materials using the potassium hexatitanate whiskers having a tunnel structure with a light alloy or a thermoplastic resin.

Abstract: Silver-plated aramid fibers are disclosed having a core of sulfonated aramid, an outer layer of continuous silver, and a zone of impregnation therebetween made up of domains of silver metal dispersed in a matrix of sulfonated aramid; and a process for making such fibers.

Abstract: The present invention is a timed release drug delivery system using hollow fibers. The drug contents of the voids in the fibers are delivered to the immediate environment of the fiber through the two open ends of each fiber. The present invention further includes a method of using a vacuum chamber for filling the fibers with the drugs to be delivered, and a method to control the manufacturing process of the hollow fibers containing drugs to obtain a certain rate of drug release. The present invention further includes fabrics manufactured from such drug delivery fibers, and articles made from such fabrics, such as vascular grafts and disposable surgical clothing.

Abstract: A molding material shaped like a plate and comprising a composite of continuous fibers and thermoplastic resin wherein each of the filaments which form the continuous fiber is coated around the surface thereof with the thermoplastic resin. Although the molding material has a high density of reinforcing fibers therein, it provides excellent distribution of fibers in the molding process; few of its fibers are broken, and its mechanical strength is considerably enhanced when its specific surface is made larger than a certain value. This molding material can be used for injection, extrusion and compression moldings.

Abstract: Polyimides are obtainable by reacting a dianhydride component with a diamine component, at least one diamine containing cycloaliphatic units, with the proviso that the dianhydride component is a mixture of different dianhydrides if the diamine component consists only of one diamine containing cycloaliphatic units and the diamine component is a mixture of different diamines if the dianhydride component consists of only one dianhydride.

Abstract: Disclosed herein are pultruded articles prepared from a reinforcing material and a polyamide matrix made by the process of impregnating a reinforcing material with a polyamide forming reaction mixture and then pultruding the impregnated reinforcing material through a die while polymerizing the polyamide forming reaction mixture to form a polyamide matrix, wherein the temperature of the material being pultruded is at least about at the lower end of the melting range of the polyamide.

Abstract: A thermobondable bicomponent synthetic fiber (8,14) with a length of at least about 3 mm, adapted to use in the blending of fluff pulp for the production of hygiene absorbent products, the fiber comprising an inner core component comprises a polyolefin or a polyester, the sheath component comprises a polyolefin, and the core component has a higher melting point than the sheath component, and a process for producing said fiber. The sheath-and-core type fiber is preferably made permanently substantially hydrophilic by incorporating s surface active agent into the sheath component. The long bicomponent fibers (20) form a strong supporting three-dimensional matrix structure (20,24) in the absorbent product upon thermobonding.

Abstract: A size for yarn which minimizes thread break is described. The size comprises an aqueous solution of (I) a polyvinyl alcohol resin, (II) a modified starch, and a water-soluble cellulose compound (III), wherein the components are related by the following equations:(I)/(II)+(III))=85/15 to 95/5, and(II)/(III)=20/80 to 80/20,while simultaneously satisfying the expressions0.27X-0.7.ltoreq.log.sub.10 Y.ltoreq.0.27X+0.6; and (1)20.ltoreq.Y.ltoreq.300; (2)(A)/(B).ltoreq.0.5 (3)where X is the solid concentration in % by weight, Y is viscosity in centipoise at 90.degree. C. and a shear rate of 10 sec.sup.-1, (A) is viscosity at 60.degree. C. and a shear rate of 10,000 sec.sup.-1 of an adjusted aqueous solution resulting from the adjustment of the viscosity to 100 centipoise at 60.degree. C. and a shear rate of 10 sec.sup.-1 with said compound ratio of each of the components kept constant, and (B) is viscosity of 100 centipoise at 60.degree. C. and a shear rate of 10 sec.sup.-1 of said adjusted aqueous solution.

Abstract: Reinforcement potassium hexatitanate fiber having an average fiber length of 8-30 .mu.m, an average fiber diameter of 0.2-0.7 .mu.m and a specific surface area of 2-4 m.sup.2 /g and a composite materials comprising the whiskers and a light alloy or thermoplastic resin. Also disclosed a process for producing the whiskers.

Abstract: A process for producing an antimicrobial fiber having a silver-containing inorganic microbicide characterized by using a treating solution for producing said fiber which contains a discoloration inhibitor represented by the following general formula: ##STR1## wherein R.sup.1 is hydrogen or a lower alkyl group and R.sup.2 is hydrogen or an alkali metal.

Abstract: The thermooxidative stability and thermomechanical properties of advanced composites which use high performance resin matrices such as polyimides and high strength carbon fibers may be improved by sizing the carbon fibers with uncapped or capped linear polyamideimides.The uncapped linear polyamideimides useful as carbon fiber sizings generally contain repeating units having the general formula: ##STR1## Wherein R.sub.2 =a trivalent organic radical and generally benzenetriyl;R.sub.3 =a divalent organic radical; andn=an integer sufficiently large to provide a strong, tough coating.Useful capped, linear polyamideimide oligomers may be formed by including end caps with an unsaturated functionality (Y) containing a residue selected from the group consisting of: ##STR2## wherein R.sub.1 =lower alkyl, lower alkoxy, aryl, aryloxy, substituted alkyl, substituted aryl, halogen, or mixtures thereof;j=0, 1, or 2;i=1 or 2;G=--CH.sub.2 --, --O--, --S--, --SO.sub.2 --, --SO--, --CO--, --CHR--, or --CR.sub.

Abstract: A communications cable (20) comprising a core (22) of at least one transmission media and a plastic jacket (34) includes provisions for preventing the movement of water within the cable. The cable includes a strength system (32) including longitudinally extending fibrous strength members (33--33) having a relatively high modulus and having water blocking provisions. In one embodiment, each fibrous strength member is treated with a superabsorbent liquid material which when dry fills interstices and covers portions of the exterior thereof. In another embodiment, a filamentary strand material comprising a water swellable fibrous material is wrapped about each fibrous strength member.

Abstract: A composite material wherein a mixture of a phenolic or furan resin and an inorganic filler as matrix materials is incorporated in an inorganic fiber or heat-resistant organic fiber in the form of a long fiber bundle. The composite material has excellent characteristics such as heat resistance, strength and alkali resistance. The present invention can provide substitutes used in place of concrete reinforcing steel bars or steel frames which can be used in structures for building and civil engineering.

Abstract: A new class polyimide and polyimide precursors based on diaryl oxyalkylene diamines, such as 1,3-bis[4-aminophenoxy]-2,2-dimethyl propane, a process for their preparation and their use as the continuous phase for the manufacture of composites and composite laminates reinforced by reinforcing agents such as carbon fibers, Kevlar.TM., and other similar high strength reinforcing agents. The polyimides and molecular composites obtained from the diamines according to the invention show thermoplastic properties, excellent flex fatigue and fracture resistance, and excellent thermal and oxidative stability.

Abstract: A white blackout fiber comprising a unitary fiber having a light blocking substance that substantially prevents the transmission of light therethrough and a whitening agent, where the whitening agent is present in an amount which provides for good after processing while the light blocking substance is present in the maximum amount which is masked by the whitening agent. Generally, the whitening agent is present in an amount between about 2.5-4% by weight of the fiber, and the whitening agent and light blocking substance are present in a ratio of between about 1000:1 and 800:1. Preferably, the whitening agent is TiO.sub.2 and the light blocking substance is carbon black.

Abstract: A fiber-reinforced rubber article has a rubber body portion with a fiber reinforcement embedded therein. The fiber reinforcement includes a plurality of tubular braided cords braided by yarns. Each of the tubular braided cords is braided by more than three yarns at a braid angle in a range between 10.degree. and 35.degree., wherein said braid angle is an angle between a yarn of the tubular braided cord and the axial line of the tubular braided cord. Each tubular braided cord also has a fistulous center hole defined by the tubular braided cord.

Abstract: Photocurable liquid coating compositions adapted to provide primary coatings for optical glass fibers are disclosed. These compositions comprise an acrylate-terminated polyurethane, an acrylate of an unsubstituted or C.sub.1 -C.sub.10 alkyl substituted phenol that is alkoxylated with a C.sub.2 -C.sub.4 alkylene oxide and at least one alkylacrylate having a T.sub.g below about -45.degree. C. Films produced from these ultraviolet light curable compositions are flexible and possess good water resistance and good wet adhesion.

Abstract: A composition comprising an acid resistant substrate in the form of fibers or particles coated with electrically conductive, doped tin oxide.

Abstract: A glass fiber strand impregnated with a liquid crystal polymer and an aqueous slurry composition useful for producing the liquid crystal polymer impregnated glass fiber strand are disclosed. The aqueous slurry composition includes a liquid crystal polymer resin powder and a thickener material. The slurry composition is applied to the glass fiber surfaces during the fiber forming process. Coupling agents, surfactants or lubricants material may optionally be added to the slurry composition. One embodiment of the slurry composition includes a polyethylene oxide binder material and a melt spinnable liquid crystal polyester which is optically anisotropic in the melt phase.

Abstract: The present invention comprises a flourochemical composition exhibiting water and oil repellency properties which is soluble in an a hydrocarbon solvent system which is non-halogenated or substantially free of halogens and strong carbonyl solvents.

Abstract: A low fiber, high filler content matrix board is provided. The matrix board is characterized by a total mold shrinkage of not more than 0.002 "/", wherein the shrinkage is substantially non-directional. In addition to the fibers and fillers, the board further comprises a resin binder. A matrix mold made from the board is provided together with a method for forming a flexographic printing plate from such a matrix mold and a printing plate made according to this method.

Abstract: The present invention relates to a polyimide resin composition and products, especially storage stable polyimide pre-pregs, manufactured therefrom with improved processing properties comprising (A) the reaction product of a polyimide, an alkenylphenol or an alkenylphenol ether, and tribromophenyl-maleimide, (B) an ionic or free-radical polymerization catalyst and (C) phenothiazine derivatives.

Abstract: A method and apparatus uniformly impregnate stranded material with dry powder such as low solubility, high melt flow polymer powder to produce, for example, composite prepregs. The stranded material is expanded in an impregnation chamber by an influx of air so that the powder, which may enter through the same inlet as the air, penetrates to the center of the stranded material. The stranded material then is contracted for holding the powder therein. The stranded material and powder may be pulled through the impregnation chamber in the same direction by vacuum. Larger particles of powder which do not fully penetrate the stranded material may be combed into the stranded material and powder which does not impregnate the stranded material may be collected and reused.

Abstract: A composite material, particularly useful for prestressing concrete and in stay cables for cable-stayed bridges and other such uses where strength, corrosion resistance and resistance to fatigue failure are particularly important, comprises high strength wire strand coated and impregnated with an impermeable and strongly adherent epoxy based resin. The impregnated and coated epoxy increases the flexural stiffness of the composite against bending fatigue in the areas of the anchorages in dynamically loaded situations and reduces relative movement and rubbing of the wires of the strand so as to reduce fretting and hence fretting fatigue, the principal mechanism for failure in dynamically loaded strand.

Abstract: Steel cables are utilized for reinforcing a wide variety of rubber articles. For instance, pneumatic tires are normally reinforced with steel tire cords. It is important for such reinforcing cables to exhibit good fatigue and corrosion resistance. It has been unexpectedly found that the fatigue and corrosion resistance of such cables can be improved by incorporating syndiotactic-1,2-polybutadiene into the interstices between the steel filaments in such cables. This invention more specifically relates to a cable for reinforcing rubber articles having improved fatigue and corrosion resistance which is comprised of a plurality of steel filaments and syndiotactic-1,2-polybutadiene, wherein the syndiotactic-1,2-polybutadiene is dispersed within interstices between said steel filaments.

Abstract: Separator materials which are adapted for use in storage batteries and which comprise a fabric sheet of polyolefin resin fibers and a surface layer of a polyolefin resin sulfonated to such an extent that sulfone groups are formed in an amount sufficient to impart an appropriate degree of hydrophilicity. The surface layer is formed on individual resin fibers. The methods of making the separator material are also described.

Abstract: A far infrared ray emitting, odor-absorbing material is disclosed. The material comprises cellulose acetate fiber having adhered thereto an ultrafine powder of alumina hydrate or silica hydrate which is chemically produced in an aqueous dispersion of the cellulose acetate fiber. The material possesses a high far infrared ray emitting, odor-absorbing capability as well as many characteristics inherently possessed by cellulose acetate fibers, and can expand the utility of cellulose acetate in such fields as sanitary, health-care, and medical fields.

Abstract: Described are novel thermosetting maleimide compositions suitable for making cured resins, prepregs and tough thermoset composites. The thermosetting compositions comprise a multifunctional maleimide and a terminally unsaturated polyamide, polyimide, or polyamideimide oligomer which is soluble in the composition. The cured resins have a fracture toughness, K.sub.IC, of at least 1.0 MPan.sup.1/2 and a glass transition temperature of at least 200.degree. C.

Abstract: Natural or synthetic fibers (or fabrics, knits, papers, or webs made of such fibers) are improved in at least abrasion resistance, dye receptivity and/or other properties by bringing together on said fibers (or product made thereof) a liquid dispersion of a dispersible normally-solid polymer having pendent acid groups, such as carboxylic groups, and a reagent which reacts with the carboxylic group to render the polymer non-dispersible. The reagent may be one which supplies metal cations having a valence of at least 2 or it may be a primary amine, secondary amine or tertiary amine, or salts of the amine, a polyamine or salt thereof, or a quaternary ammonium salt. The reagent may precede the polymer onto the substrate, or may follow the application of the polymer onto the substrate.

Abstract: In a method for bonding a nitrile group-containing highly saturated polymer rubber having an iodine value of 120 or less to fibers on vulcanization, the improvement wherein fibers treated with an aqueous dispersion comprising a halogen-containing polymer latex and a resorcinol-formaldehyde resin are used.

Abstract: A fiber-reinforced metal comprising glass fibers and a matrix metal, said glass fibers having a nitrogen content of at least 8 atomic %. The fiber-reinforced metal has a high tensile strength and elasticity.

Abstract: Composite of improved flex fatigue life comprising 50 to 70 volume percent reinforcing filaments of carbon, aramid or glass uniformly coated with a polymer in a polymeric matrix. The Young's modulus of the filament coating polymer is intermediate the Young's modulus of the filament and the matrix polymer.

Abstract: Film or fibre is made from a polymer of water soluble ethylenically unsaturated monomeric material that includes ionic monomer by extrusion and stretching, and a counterionic lubricant compound is absorbed into the surface of the fibre or film before or during the stretching. The counterionic lubricant compound is also of use for providing a lubricated film on other extruded or comminuted elements of water swellable or water soluble polymeric material.

Abstract: A molding material consists of a curable synthetic resin, reinforcing fibers and fillers, the synthetic resin being applied in two layers to the reinforcing fibers: In an inner layer, the reinforcing fibers are impregnated with a synthetic resin component A which contains up to 10% by weight of fillers, and, in an outer layer, the impregnated reinforcing fibers are coated or surrounded with a further synthetic resin component B which contains not less than 20% by weight of fillers, and the components A and B may contain similar or different synthetic resins.

Abstract: A method of imparting heat resisting properties to synthetic plastics materials comprises incorporating in the material an organic antioxidant each molecule of which contains a reactive hydrogen atom and does not become an oxidation radical when the hydrogen atom is replaced by a free radical obtained from the polymer.

Abstract: A method of manufacturing a sensing element, comprising bringing a first body in the form of an oil-free cross-linked matrix of flexible elastomeric material, the matrix containing electrically conductive particles, into contact with a second body of flexible elastomeric material that is electrically insulating and that contains an oil compatible with the elastomeric material of the first body, and allowing oil to migrate from the second to the first body so as to cause swelling of the first body, the migration continuing until a state of oil phase equalisation between the two bodies is reached.

Abstract: A moulded body having an inner support matrix is enveloped at least partially with a plastic envelope making up the mould. The support matrix is formed at least partially from metal wire pieces and/or metal chips, which are compression moulded and sintered.

Abstract: In the manufacture of creep-free prepregs based on phenolic resins of the resole type, the reinformcing agents are impregnated with an essentially solvent-free mixture of a phenolic resin and a viscosity controlling amount up to 60% by weight of the resin of an alkali metal metaborate or an alkaline-earth metaborate or a mixture thereof. The resultant compression molded articles exhibit improved strengths.

Abstract: Phenolic resin compositions.Phenolic resin compositions containing an additive consisting of at least 20% by weight of an alkaline or alkaline-earth metaborate relative to the total weight of the additive.Applications to the manufacture of phenolic pre-preg mats which are stable in storage.

Abstract: Excellent stabilization of pigmented polypropylene (PP) fiber against gas fade upon exposure to atmospheric pollutants is obtained with a hindered amine containing a polysubstituted piperazin-2-one (PSP) moiety, for example, a C.sub.2 -C.sub.12 alkylene connecting two PSP moieties, or a trisubstituted triazine ring with three PSP substituents, or a polyalkylene polyamine having pendant substituted oxo-piperazinyl-traizine moieties (PIP-T), that is, having pendant triazine rings substituted with PSP substituents. The stabilizers are unexpectedly effected when used without an antioxidant which produces yellowing, if used. Either pigmented or unpigmented PSP-stabilized PP fibers, and particularly fibers pigmented with white or pastel dyes, and having a non-alkaline "finish" are especially benefitted.

Abstract: Phenolic resin compositions.Phenolic resin compositions containing an additive consisting of at least 20% by weight of an alkaline or alkaline-earth metaborate relative to the total weight of the additive.Applications to the manufacture of phenolic prepreg mats which are stable in storage.

Abstract: A composite ceramic-ceramic material is disclosed having a fibrous reinforcing ceramic and a ceramic matrix made of a geopolymeric compound containing:(a) a poly(sialate) geopolymer M.sub.n (--Si--O--Al--O--).sub.n and/or poly(sialate-siloxo) M.sub.n (--Si--O--Al--O--Si--O--).sub.n, M representing at least one alkaline cation, and n the degree of polymerization;(b) ultrafine silicious and/or aluminous and/or silico-aluminous constituents, of size smaller than 5 microns, preferably lower than 2 microns,the said geopolymeric compound being obtained by polycondensation at a temperature between 20.degree. C. and 120.degree. C. of an alkaline alumino-silicate reaction mixture, the composition of the principal constituents of the said geopolymeric compound expressed in terms of mole ratios of the oxides being between or equal to following values:M.sub.2 O/SiO.sub.2 --0.10 TO 0.95,SiO.sub.2 /Al.sub.2 O.sub.3 --2.50 TO 6.00,M.sub.2 O/Al.sub.2 O.sub.3 --0.25 TO 5.70,M.sub.2 O representing either Na.sub.2 O and/or K.

Abstract: The invention relates to compositions and methods for smoothing textile fibers which compositions are characterized in that they contain as lubricants an aliphatic polyether corresponding to the following general formula:R.sup.1 --X--O--R.sup.2in which R.sup.1 and R.sup.2 are linear and/or branched, saturated and/or saturated, OH-containing or OH-free C.sub.6 -C.sub.24 alkyl radicals of natural and/or synthetic origin and X is a homopolymer or copolymer containing one or more C.sub.2 -C.sub.6 alkylene oxides having a degree of polymerization of 1 to 25, either alone or in admixture with other smoothing agents.The other smoothing agents include paraffins, polyethylenes, fatty acid ethers, silicones or polyalkylene glycols. The compositions may be applied to textile fiber in the form of solutions, emulsions or aqueous dispersions.

Abstract: The present invention relates to advanced composite materials composed of reinforced fibers, and a polyvinyl formal and an epoxy resin composition hardened by dicyandiamide and/or a urea derivative. A specific polyvinyl formal resin and epoxy resin composition that is resistant to phase separation is disclosed. Also disclosed is a polyvinyl formal of 5 microns or less in average grain size finely dispersed in an epoxy resin composition which has enhanced tensile strength and elongation in the direction perpendicular to the fiber direction.