This invention relates to a novel process for the production of polyurethane via an intermediate stage of aqueous dispersions of oligomeric polyurethane prepolymers having ionic and/or non-ionic hydrophilic groups which ensure their dispersibility in water, followed by conversion of these water-dispersible oligomers into cross-linked high molecular weight sheets.

PURPOSE:To obtain the title product, having improved abrasion, creep resistance and modulus of elasticity and useful as fluororesin printed circuit boards, etc., without deteriorating insulation resistance, by pretreating a glass fiber product with a specific perfluoroalkylsilane. CONSTITUTION:The aimed product obtained by pretreating a glass fiber product with a perfluoroalkylsilane expressed by ...

PURPOSE:To prevent a change in a resistance value even if its shape is changed by outer force by distributing a plurality of superconductive elements in a normal conductivity material and connecting them electrically in series. CONSTITUTION:A low resistance conductor is composed of a plurality of superconductive elements 1, and a normal conductor 2 which connects the respective superconductive ele...

PURPOSE:To improve crook-resisting performance by covering a periphery of a string oxide superconductor with a metallic sheath which is formed into a cylinder of a smooth cross-sectional shape or a corrugated cross sectional shape. CONSTITUTION:Each element wire of oxide superconductors 11 is formed of an oxide of europium/barium/copper or an oxide of yttrium/barium/copper. A plurality of these el...

PURPOSE:To reduce an eddy current loss by using a Cu-Ni alloy as a material of a tube forming a path for a cryogenic medium. CONSTITUTION:A tube 7 on which superconductive wires 1 are soldered 3 is formed of a Cu-Ni alloy. Resistance of the Cu-Ni alloy is larger by more than three figures compared with copper. Accordingly, an eddy current loss has a smaller value by more than three figures compare...

PURPOSE:To manufacture an oxide compound superconductive wire having high critical current density by melting a raw material of an oxide compound superconductor and linearly extruding this melt into an oxygen atmosphere or a mixed gas atmosphere consisting of oxygen and fluorine through a nozzle for being solidified. CONSTITUTION:A raw material A is housed in a crucible 3. Next, a cover 2 is mount...

PURPOSE:To prevent deterioration and loss of superconductivity of a thin film of rare-earth oxide superconductor, by providing a thin tantalum nitride film as a buffer film after forming the thin film of rare-earth oxide superconductor. CONSTITUTION:A thin film of Ln-Ae-Cu oxide (Ln is Y and the rare-earth Ae is an alkaline earth) is formed on a substrate and heat treated within atmosphere contain...

PURPOSE:To enable an electronic or optical device requiring refined working to be worked easily and with high reliability, by heating a part of a thin film of oxide superconductor by means of electron beams or laser for changing element composition or atomic arrangement of the film. CONSTITUTION:A thin film of oxide superconductor 3 is partially heated by means of electron beams 2 or laser so that...

PURPOSE:To facilitate manufacture of electronic and optical devices or equipments having high reliability and refined structure, by using ion beams for ion implantation conducted for modification of a film. CONSTITUTION:A superconducting material is converted into a normal conducting material (insulator) by ion implantation of elements constituting an oxide superconductor to change stoichiometry t...

A polyorganosilsesquioxane fine powder which is surface-treated with an organosilicon comound containing a quaternary ammonium group, represented by the formula (I) or (II): (I) (II) wherein R1 represents an alkyl group, a substituted or unsubstituted aralkyl group, or a group represented by (CnH2nO)mZ wherein Z represents a hydrogen atom or an alkyl group, symbol n is an intege...

A silicone resin fine powder containing a quaternary ammonium group-containing organofunctional group and having excellent physiological activity, hydrophilicity and polarity, which comprises units represented by RSiO3/2 wherein R represents a substituted or unsubstituted monovalent hydrocarbon group, and additionally at least one of units represented by SiO2 and units represented by RSiO wherein ...

A packaging film comprises a base film of at least partially water-soluble plastics film, for example, polyvinyl alcohol, carrying on one side a protective layer of particulate inert plastics material, for example, polytetrafluoroethylene powder, having a high water repellency. The film is thus vulnerable to attack by aqueous media on one side and protected against such attack on the other. It may...

The invention relates to a process for the production of rigid foam from acrylic and/or methacrylic polymers by polymerisation and foaming of acrylic acid compounds and/or methacrylic acid compounds at elevated temperature, in which an oligomer mixture, a flameproofing agent and a nitrogen-eliminating catalyst, a cell regulator, a foam stabiliser or foam regulator, a crosslinking agent and a wetti...

The invention relates to an epoxy resin composition containing (A) an epoxy resin, (B) a copolymer resin having an acid number of at least 280 prepared using an aromatic vinyl compound and maleic anhydride as essential starting components, and (C) dicyandiamide. Prepregs are produced therefrom by impregnating fibrous substrates with the epoxy resin composition. Laminated sheets can be produced by ...

A high molecular weight vinylidene fluoride polymer resin having improved melt flow properties and further characterized as having a bimodal molecular weight distribution, as measured by gel permeation chromatography, and a specified critical shear stress.

This invention relates to a process for producing an oriented, crystalline poly(acetylene) (III) in film or fibrillar form by solvent casting a film from a solution of a polymer of the general formula (V) derived from a precursor monomer (IV), and transforming the pre-cast film of polymer (V) under tension or in a stress field into the poly(acetylene) (III). The transformation is carried out at a ...

1. Compressional spring brake device comprising a brake disc ridgidly mounted on a rotatable shaft (12, 12'), an annular magnetic armature (8, 8', 8", 8"') facing the brake disc on one side, said armature surrounding the shaft concentrically at a distance, said armature arranged non-rotatable but axially slidable, means generating braking power, pressing the armature against the brake disc, an ele...

1. Device for guiding the spine along the ventral face, for the splitting-up of animals carcasses, comprising a swing plate (9) mounted for pivoting on a support (11) and carrying, at one end, a first guiding surface (12) designed to cooperate directly with the ventral face of the spine (5) in at least one point and, at the other end, a second guiding surface (15) spaced from the first guiding sur...

Novel gel-spun, irradiated and drawn ultra high strength high molecular weight and at least partially cross-linked and/or broadened polyethylene filaments, tapes and films, exhibiting substantially lower creep rates than corresponding but non-irradiated articles are decribed, along with a process for making the same.