Abstract: This invention relates to a method for producing surface-treated magnetic power for high record density magnetic recording medium which has excellent dispesibility and high filling density and surface smootheness.This invention provides a method for producing surface-treated magnetic powder characterized by treating magnetic powder with at least one functional group of the epoxy group, carboxyl group, hydroxyl group, thiol group and amino group and with hydrocarbon group having more than eight methylene chains.

Abstract: Disclosed is a magnetic recording medium comprising a non-magnetic support and a magnetic layer composed mainly of a ferromagnetic powder and a binder, which is formed on one surface of the support, and an optional backcoat layer composed mainly of a non-magnetic powder and a binder, which is formed on the other surface of the support. At least one of the magnetic layer and the backcoat layer contains a compound having at least one >C.dbd.N.sup..sym. < bond in the molecule. When preparing the magnetic recording medium, the magnetic powder or non-magnetic powder may be surface-treated with the >C.dbd.N.sup..sym. < group-containing compound.

Abstract: A process and apparatus for producing laminated glass wherein a film-forming plastisol is coated on a surface of a first glass plate to form a layer of the plastisol so that the thickness of the layer may monotonically vary; a second glass plate which has been heated at least at its peripheral portions is brought in contact with the layer of the plastisol first at a portion where the layer is the thickest and thereafter at portions where the layer is thinner, thereby gradually laminating the glass plates to each other while causing the plastisol to lose its fluidity at portions where is comes in contact with the heated second glass plate; and the laminated glass plates is heated under pressure so that the plastisol gelates. The process and apparatus are productive of laminated glass of high quality in high productivity.

Abstract: A vinyl chloride resin for safety glass, comprising either particles of a copolymer of a vinyl chloride monomer and an epoxy-containing monomer, having a particle diameter up to 5 .mu.m and a greater epoxy content in an outer portion than in a an inner portion of the particles, or agglomerates of the particles, and process for the preparation of this resin, comprising either adding an epoxy-containing monomer into a polymerization reaction mixture of a vinyl chloride monomer substantially during a latter half of the polymerization reaction of the polymerization mixture or adding an epoxy-containing monomer and a vinyl chloride monomer either in the form of a mixture solution or separately but at the same time into a polymerization mixture of the vinyl chloride monomer.

Abstract: Disclosed is a magnetic recording medium having a magnetic layer comprising a vinyl chloride copolymer as a binder and a magnetic powder and formed on a non-magnetic support. The vinyl chloride copolymer contains a hydroxyl group and a quaternary ammonium salt, wherein the hydroxyl group is derived from a monoallyl or monomethallyl ether of a polyhydroxyl compound, or a monoallyl or monomethallyl thioether of a polyhydroxyl compound. The vinyl chloride copolymer may further contain a hydrophilic group derived from at least one monomer which is selected from carboxylic acids, sulfur-containing acids, phosphorus-containing acids and salts thereof.

Abstract: This invention relates to a process for manufacturing laminated safety glass.A first process comprises the steps of:(A) coating at least one side of a glass plate with a film-forming plastisol composed of an epoxy group containing vinyl chloride resin as an indispensable component;(B) heating said glass plate having a coating to form a gel plastisol layer on at least one side of said glass plate; and(C) laminating another glass plate thereon through the medium of said gel plastisol layer and heating the resulting laminate, thereby bonding said glass plates to each other.A second process comprises the steps of:(a) filling the gap between the surfaces of a plurality of glass plates with a film-forming plastisol composed of an epoxy group-containing vinyl chloride resin as an indispensable component; and(b) heating said plurality of glass plates containing said film-forming plastisol filled into the gap therebetween, thereby bonding said plurality of glass plates to each other.

Abstract: A magnetic coating comprising magnetic powder, a binder and an organic solvent, characterized in that at least one component of the binder is a vinyl chloride copolymer having hydroxyl group, and carboxylic acid groups or sulfur- or phosphorus-containing strong acid radicals, and the comonomer supplying the hydroxyl groups is a monoallyl ether of polyhydroxy compound, and a magnetic recording medium made by coating a substrate with the magnetic coating.

Abstract: A copolymer useful for magnetic paints is provided which is composed of (1) at least 60% by weight of vinyl chloride units (2) 0.1 to 4.0% by weight, as a sulfur- or phosphorus-containing strong acid group, of strong acid group-containing monomer units, (3) at least 0.1% by weight, as the hydroxyl groups, of units of a monomer which gives a side chain represented by the formula --X--OH wherein X is an organic group, and (4) 0 to 20% by weight of units of another monomer.

Abstract: A copolymer useful for magnetic paints is provided which is composed of (1) at least 60% by weight of vinyl chloride units, (2) 0.1 to 4.0% by weight, as a sulfur- or phosphorus-containing strong acid group, of strong acid group-containing monomer units (3) at least 0.1% by weight, as the hydroxyl groups, of units of a monomer which gives a side chain represented by the formula --X--OH wherein X is an organic group, and (4) 0 to 20% by weight of units of another monomer.

Abstract: A magnetic recording medium consisting of a substrate and a magnetic layer formed thereon, said magnetic layer comprising (I) an epoxy group-containing vinyl chloride resin or [I'] both a vinyl chloride resin and an epoxy group-containing resin, [II] a perfluoroalkyl group-containing carboxylic or sulfonic acid compound, and [III] a magnetic powder.

Abstract: A magnetic recording medium is disclosed, which comprises a base and a magnetic layer formed on at least one surface of the base and the magnetic layer comprises a magnetic powder and a binder which comprises a vinyl chloride resin having both epoxy and quaternary ammonium salt groups.

Abstract: A magnetic recording medium comprising a substrate and a magnetic layer formed thereon, said magnetic layer comprising a vinyl chloride resin, a resin containing an epoxy group, and at least one additive selected from the group consisting of (1) a phosphoric acid ester, (2) a carboxylic acid compound having a pKa of not more than 4, (3) a monosulfate compound and (4) a sulfonic acid compound.

Abstract: A magnetic recording medium characterized by having a magnetic layer containing an epoxy group-containing vinyl chloride resin and at least one additive selected from the group consisting of (1) a phosphoric acid ester compound, (2) a carboxylic acid compound having pKa of 4 or less, (3) a sulfuric acid monoester compound and (4) a sulfonic acid compound.

Abstract: An electron-beam reactive magnetic coating composition for use in magnetic recording media comprising a magnetic powder and a polymer resin as a binder therefor, the polymer resin containing vinyl chloride as a main component and having at least one hydrophilic group selected from the group of COOM, SO.sub.3 M, SO.sub.4 M, PO.sub.3 M.sub.2 and PO.sub.4 M.sub.2 (wherein M represents hydrogen, an alkali metal or ammonium) and not more than 10,000 double bond equivalents of an unsaturated acid ester group.

Abstract: A stripping column for removing volatile matter from a slurry containing sedimentary solid matter and the volatile matter, comprising a plurality of trays each consisting of a plurality of tray segments, a baffle plate and a downcomer, each of the tray segments being so formed as to have many inclined slits and inclined flat planes. In one embodiment, this invention relates to a process for such removal using the stripping column.