Abstract: To provide a heat cycle system with high durability, which employs a working fluid for heat cycle containing trifluoroethylene having a low global warming potential. A heat cycle system 10 which has a circulation path in which a working fluid for heat cycle containing trifluoroethylene is circulated from a compressor 11 via a condenser 12, an expansion valve 13 and an evaporator 14 to the compressor 11, wherein a conductor wire provided in the circulation path is covered with a heat resistant material having a heat resistance of at least 300° C.

Abstract: A resin composition for spacers of an information recording disc which comprises: (A) a random copolymer of ethylene and at least one cycloolefin having an intrinsic viscosity [.eta.] of from 0.05 to 10 dl/g, as measured in decalin at a temperature of 135.degree. C., and (B) from 0.01 to 5 parts by weight, based on 100 parts by weight, of said copolymer A, of an inorganic particles such as titania and silica having a particle size of not more than 300 .mu.m. Spacers made of the composition described herein can be welded to disc substrates within a shortened period of ultrasonic vibration to produce an information recording disc having a reduced warp angle.

Abstract: High density information records made of vinyl chloride resin compositions which comprise conductive powder and inorganic compounds in the form of powder having an antacidic action and a predetermined average size. By this, dropout defects in the information record can be suppressed to a significant extent. The inorganic compounds are selected from calcium hydroxide, basic aluminum magnesium carbonate hydrate and hydrotalcite.

Abstract: High density information records formed from conductive resin compositions which comprise a graft polymer obtained by subjecting vinyl chloride monomer to graft polymerization with a copolymer of ethylene and vinyl acetate having a content of vinyl acetate of not less than 35 wt % and a melt index up to 20 and prepared according to a solution polymerization technique. The conductive composition further comprises predetermined amounts of a conductive material and a lubricant of a specific type. The lubricant is an ester between aliphatic acid and alcohol having a hydroxyl value not larger than 15.

Abstract: An antistatic thermoplastic composition comprising a blend of a thermoplastic graft polymer; a thermoplastic halogenated polymer; and an amount of conductive carbon black effective to cause the composition to have a surface resistivity of 10.sup.2 -10.sup.12 ohm/square, wherein the ratio of (a)/(b) is from 9:1-1:9, by weight and the weight percentage of (c) is from 2-10%.

Abstract: A polymer concentrate containing an antistatic agent and a process for the production thereof are provided, in which the antistatic agent is applied to the particle surface of a finely divided polymer powder. The thus obtained concentrate is suitable for producing plastic molding compounds for plastic finished products, such as phonograph records having improved characteristics.

Abstract: Polymeric compositions are provided in which perfluoropolyethers have been solubilized in non-fluorinated solvents by combining them with a solubilizing agent such as azotic conjugated compounds, and phosphorylated compounds. Typical of the perfluoropolyethers is ##STR1## Typical of the solubilizing agents is phosphorylated methacryloyloxyhydroxypropylisophthalate. The perfluoropolyether and the solubilizing agent are mixed to form a paste which is soluble in organic solvents such as methylethylketone. These compositions find utility as protective lubricant coatings for thin film magnetic recording media. They have the advantage that only one coating step is required in order to apply both the phosphorylated compound and the lubricating polyether. Recording media lubricated with these compositions have demonstrated excellent wear characteristics.

Abstract: A vinyl chloride resin composition for production of hard articles. The composition comprises 100 parts by weight of a graft polymer and not more than 40 parts by weight of electrically conductive carbon black. The graft polymer is obtained by polymerizing 99 to 60% by weight of vinyl chloride or a monomeric mixture composed of at least 80% by weight of vinyl chloride and not more than 20% by weight of a monomer copolymerizable with it in the presence of 1 to 40% by weight of a copolymer composed of 5 to 75% by weight of methyl methacrylate and 95 to 25% by weight of ethylene.

Abstract: A high density information record of the electrostatic capacitance type comprising a record substrate on which signal information is recorded as geometric variations. The record substrate is made of a conductive resin composition comprising a vinyl chloride resin and a conductive powder. The vinyl chloride resin is obtained by suspension polymerization of starting vinyl chloride monomer in an aqueous solution of a water-soluble polymer suspension stabilizer from which insoluble organic matters with sizes over 10 .mu.m have been removed.

Abstract: Sandwich-type capacitive electronic discs having thin conductive layers are prepared by adding a thermally processed conductive molding composition comprising a thermoplastic resin, conductive carbon black particles and suitable additives to a suitable solvent to form a dispersion of the conductive carbon black in a solution of the remaining ingredients. The dispersion is filtered to remove impurities larger than a predetermined particle size and coated onto a core disc. The coating is dried to form a conductive layer which is embossed with the desired information.

Abstract: A disc-shaped information carrier produced by thermoplastic deformation comprising a pressed mass including a co-polymer of vinyl chloride having additives incorporated therein. The carrier has hygroscopic properties and relief-like surface portions which are sufficiently yielding to permit pressure scanning.

Abstract: A high density capacitive information disc recording medium fabricated from a conductive plastic molding composition including a moldable plastic and conductive carbon black particles having a volatiles content at 950.degree. C. of less than about 1 percent.

Abstract: An electroconductive resin composition is a blend of 5-30% by weight carbon black and a graft-polymer. The graft-polymer is obtained by graft polymerizing 99-76 parts by weight of monomeric vinyl chloride to 1-15 parts by weight of an ethylenevinyl acetate copolymer, the ethylenevinyl acetate copolymer containing 10-65% by weight of vinyl acetate. The electroconductive resin composition has superior heat resistance and mechanical strength and improved flowability and heat stability. The electroconductive resin composition is particularly suitable for preparing video disc records.

Abstract: Low density conductive carbon black agglomerated particles are finely divided to a particle size below 0.044 millimeter and added in a portionwise manner to a PVC resin in a closed system. The process ensures a uniform dispersion of the carbon black into the PVC resin and uniform bulk and surface properties of articles molded from the resultant resin.

Abstract: Electrically-conductive compositions comprising about 65-85 weight percent of a resin component based on conjugated alkadienes having 4 to 8 carbon atoms and monovinyl-substituted arenes having 8 to 12 carbon atoms, with 10-30 weight percent extra-conductive carbon black, and about 1 to 5 weight percent of at least one lubricant can be molded into video discs without the processing problems encountered with compositions comprising polyvinyl chloride.

Abstract: An electroconductive resin composition is a blend of 5-30% by weight of carbon black and a graft-polymer. The graft-polymer is obtained by graft-polymerizing 99-76 parts by weight of monomeric vinyl chloride to 1-15 parts by weight of an ethylene-vinyl acetate copolymer, the ethylene-vinyl acetate copolymer containing 10-65% by weight of vinyl acetate. The electroconductive resin composition has superior heat resistance and mechanical strength and improved flowability and heat stability. The electroconductive resin composition is particularly suitable for preparing videodisc records.

Abstract: A hard vinyl chloride resin composition for information signal recording media, said composition consisting essentially of(A) 100 parts by weight of a copolymer having a specific viscosity of 0.16 to 0.31 and composed of 75 to 99% by weight of vinyl chloride, 1 to 10% by weight of ethylene and 0 to 15% by weight of another monomer copolymerizable with said monomers, and/or a polymer mixture having a specific viscosity of 0.16 to 0.31 and composed of at least two polymers selected so that the proportions of monomer components are the same as above, and(B) 15 to 30 parts by weight of carbon black having an oil absorption of 300 to 400 ml/100g and a surface area of at least 900 m.sup.2 /g.

Abstract: An improved molding composition having a high thermal stability, including a vinyl chloride/vinyl acetate copolymer-based resin, sufficient finely divided conductive particles to obtain the desired conductivity, and from 3 to 20 weight percent of the modifying additive BLENDEX 586, which is a three-component blend of polyvinyl chloride, a graft copolymer of acrylonitrile, styrene and polybutadiene, and a copolymer of alpha-methyl styrene and acrylonitrile, as described in U.S. Pat. No. 3,053,800. High density information discs fabricated from this molding composition have improved dimensional stability and increased resistance to environmental temperature changes.

Abstract: The invention relates to a method of manufacturing an improved pigment of FeOOH particles. The starting material is an acidic or alkaline aqueous dispersion of FeOOH particles which has been manufactured according to known methods. According to the invention, a water-soluble ammonium salt, which is derived from a low-molecular weight, weakly acidic organic acid and which volatilizes either as such or after decomposition not greater than 450.degree. C., is added to the aqueous dispersion. As a result of the addition of the ammonium salt, the FeOOH pigment flocculates. It is then separated and washed with water which preferably is also provided with the ammonium salt. According to a further embodiment of the invention the resulting pigment which, after drying, has a very low salt content, is converted into an Fe pigment or a .gamma. Fe.sub.2 O.sub.3 pigment which also has a very low salt content. A magnetic recording element which is based on the Fe or .gamma. -Fe.sub.2 O.sub.