Abstract: A PC strand is coated with rust inhibitive material of thermoplastic resin so as to wholly close spaces left around a core and peripheral wires twisted around the core, thus preventing the core and wires from rusting. The strand coated with the rust inhibitive material can be produced without being untwisted by use of an extruding machine having an auxiliary pressure head connected to a cross head.

Abstract: There is provided a process for the preparation of composite semi-permeable membrane superior in selectivity and permeability, capable of improving bonding strength between a porous support layer and a reinforcement and mechanical strength of semi-permeable membrane.The composite semi-permeable membrane is prepared by subjecting woven fabric or non-woven fabric to corona discharge with a discharge power of approximately 10 to approximately 15 watt for a period of approximately 20 to approximately 40 seconds, spraying water over one surface of the fabric, casting porous support substance on the other surface of the fabric when a time of approximately 5 to approximately 10 seconds has elapsed after the spray, and laminating a crosslinked polyamide ultrathin film on the porous support substance, the polyamide ultrathin film being synthesized by interfacial polycondensation of a multifunctional amine solution and a multifunctional halogen solution.

Abstract: By utilizing the process of this invention, the adhesion between polymeric reinforcements and rubber compositions can be greatly improved. This invention more specifically discloses a process for preparing a rubber article containing a polymeric reinforcement which comprises: (1) plasma treating the polymeric reinforcement in a manner whereby reactive groups containing Zerewitinoff active hydrogen atoms are bonded to the surface thereof; (2) incorporating the polymeric reinforcement having Zerewitinoff active hydrogen atoms bonded to the surface thereof into an uncured rubber composition, wherein said rubber composition has pendant blocked isocyanate groups bound thereto; and (3) curing the uncured rubber into the desired shape for the rubber article at an elevated temperature sufficient to deblock the isocyanate groups bonded to the uncured rubber allowing for the isocyanate groups to react with the Zerewitinoff active hydrogen atoms bonded to the surface of the polymeric reinforcement.

Abstract: A method of reducing the adsorption of protein by a polymeric fabric; e.g., a polyolefin fabric, which involves providing a polymeric fabric having a surface, applying to the surface of the polymeric fabric a composition including water and a surfactant adapted to reduce the adsorption of protein by the polymeric fabric, and treating the fabric to which a surfactant has been applied by air corona discharge at a corona energy density of from about 10 to about 280 kilojoules per square meter. The surfactant is present on the fabric in an amount sufficient to reduce the adsorption of protein by the fabric. The coated fabric is especially suited for incorporation in such disposable absorbent articles as diapers; feminine care products, such as sanitary napkins and tampons; incontinent care products; training pants; and wipes.

Abstract: A method for making tufted carpet, as well as the tufted carpet made by this method, are provided. Pile yarn fibers are tufted into a tufting backing, which is composed of a primary backing, a secondary backing, and an elastomer sandwiched between the primary and secondary backings. In another embodiment, the tufting backing comprises a primary backing and an elastomer applied to the primary backing, but does not include a secondary backing. In a preferred embodiment, the elastomer is applied to the primary backing in a non-contiguous form whereby voids are provided within the arrangement for the tufting backing to be tufted without the primary backing fibers being immobilized. After the pile yarn fibers are tufted into the tufting backing, the elastomer is heated such that it softens, allowing the elastomer to flow in and around the pile yarn fibers. The elastomer may then be cooled, thereby hardening the elastomer and bonding the pile yarn fibers to the primary backing.

Abstract: A method of treating an aramid monofilament by plasma in such a manner that the monofilament has a wettability by water satisfying the relationship WS.sub.SL .gtoreq.120, W.sub.SL being the reversible solid-liquid adhesion work expressed in mJ/m.sup.2. By way of example, the treatment is carried out by means of a plasma at reduced pressure, and the monofilament is subjected to a coating treatment after the surface treatment. The aramid monofilament is characterized by the following relationships:1.7.ltoreq.Ti.ltoreq.260;40.ltoreq.D.ltoreq.480;T.gtoreq.170-D/3;Mi.gtoreq.2,000; andW.sub.SL .gtoreq.120.In the above relationships, Ti represents linear density in tex, D represents diameter in .mu.m (micrometers), T represents tenacity in cN/tex, and Mi represents initial modulus in cN/tex. The aramid monofilament is particularly useful for reinforcing tires.

Abstract: The invention relates to the use of the amino groups created on the surface of a polymer material, such as a polypropylene film, by an electric treatment, notably a cold plasma, under nitrogen atmosphere, for accelerating the grafting of the polymer material by impregnating the latter with a bath containing a vinyl type unsaturated monomer comprising a carbonyl group in .alpha. of the double vinyl bond, such as an acrylic monomer.

Abstract: A method for plasma treatment of a predetermined portion of a substrate. The impedance of the coil and an established normal plasma is matched with the impedance of a power source, thereby maximizing the efficiency of the transfer of energy from the power source to the coil and producing a resonant plasma. The predetermined portion of the substrate is exposed to the resonant plasma for treatment. Additionally, a method for plasma treatment of a predetermined portion of the outside surface of a filament. The filament is trained through an inlet and exit of a plasma treatment chamber, through an inlet side tubular mask within the chamber, and through an exit side tubular mask within the chamber, each mask being adjustable within the chamber axially of the filament to expose a predetermined segment of the filament to plasma in the chamber while masking the remainder of the filament within the chamber from exposure to plasma.

Abstract: The invention relates to a wall material for a cell-structure plant growing container comprising several layers out of which at least one is of a decayable material, such as paper, and which is characterized in that it comprises at least three material layers bonded together, all the layers being permeable to water and nutrients and the middle layer being formed by a nonwoven or reticulate material impregnated with a growth control agent or comprising firmly attached to its both sides a growth control agent, or a layer of decayable material, such as paper, in which the side facing said middle layer is coated with a growth control agent. The invention is also concerned with the use of said wall material, and to a cell-structure plant growing container made of the material.

Abstract: The invention relates to articles consisting of highly oriented polyolefins having an ultrahigh molecular weight of more than 600,000 g/mol (weight-average molecular weight), especially filaments, fibers, yarns, fabrics and films, having good wetting and adhesive properties, especially on conventional matrix materials, which have been subjected to a plasma treatment of their surface, and also to a process for producing these articles and to their use for the manufacture of composites with the use of conventional matrix materials. In these composites, yarns according to the invention, for example, show a substantially higher adhesive strength than corresponding yarns which have not been plasma-treated, their tensile strength not being impaired by the plasma treatment.

Abstract: This invention relates to the use of low temperature plasma technology for significantly improved corrosion protection of metals. The plasma process involves pretreatment of the surface of the metal with a gas plasma comprising argon, hydrogen, or mixtures thereof, followed by plasma deposition of a thin polymeric film on the treated surface, followed by cathodic electrocoat application of a primer.

Abstract: A method of finishing carbon fibers with phenolic triazine to promote adhesing of the carbon fibers with a resin matrix to retain up to 92% of the room temperature dry strength at a temperature of 500.degree. F.

Abstract: According to the proposed method a moving substrate is transported through plurality of zones of treatment by plasma flows, arranged parallel to the moving substrate. Plasma flows are produced in each treatment zone in individual regions, a plasma-forming gas being supplied into the gaps between the adjacent regions and directed to the surface of the moving substrate. These gaps between adjacent regions are produced by electric potentials, equal in magnitude and similar in polarity, of electrodes used to generate plasma flows of adjacent regions. In a device realizing the method, pairs of electrodes used to form individual treatment regions are arranged so that any two adjacent pairs have their like electrodes facing each other, plasma-forming gas feed nozzles being fit in the gaps between said electrodes.