Abstract: A chemically resistant composite sheet composed of a PTFE substrate layer, a glass cloth, and an intermediate thermoplastic fluoropolymer layer of a thermoplastic fluorocarbon resin prepared by laminating the layers between a pair of rollers under pressure and under heat sufficient to melt the intermediate thermoplastic fluropolymer.

Abstract: An element for lining the interior surface of a tunnel, which comprises a composite panel in which a fibrous layer is laminated over a hard substrate, and a fluoropolymer surface layer is laminated over said fibrous glass layer.

Abstract: An element for lining the interior surface of a tunnel, which comprises a composite panel in which a fibrous layer is laminated over a hard substrate, and a fluoropolymer surface layer is laminated over said fibrous glass layer.

Abstract: The invention relates to a lined tank having a tank body of a wall with an interior surface and an exterior surface, one or more exterior shells disposed over at least a part of the tank body, the exterior shell being separated by a clearance from the exterior surface, a plurality of penetration holes ranging through the wall into the clearance, a chemically resistant tank liner having a side adhesively attached to the interior surface, and suction ports in the exterior shell for enabling vacuum drawn through the suction ports to exert a negative pressure on the tank liner through the penetration holes.

Abstract: An acrylic rubbery polymer having remarkably improved cold resistance can be prepared by modification with an organopolysiloxane by the emulsion copolymerization of a monomeric mixture of two acrylic monomers, of which one is, for example, an alkyl acrylate and the other is an acrylic compound having, in a molecule, at least one ethylenically unsaturated group other than acrylic group in an aqueous emulsion of an organopolysiloxane having a substantial amount of mercapto-substituted monovalent hydrocarbon groups bonded to the silicon atoms.

Abstract: A UV light-absorbing skin-protecting composition which comprises an acrylic copolymer comprising (A) a compound of the formula: ##STR1## wherein R.sup.1 is a hydrogen atom or a methyl group, X is a group of the formula: ##STR2## in which R.sup.2 is a hydroxy group, R.sup.3 is a hydrogen atom or hydroxy group, R.sup.4 and R.sup.5 are the same or different and each is a hydrogen atom, a lower alkyl group, a lower alkoxy group, a halogen atom, a nitro group, a carboxyl group, a sulfonic acid group or a sulfonamide group and R.sup.6 is a single bond or a methylene group,Y is --O--, --NH-- or a group of the formula: ##STR3## in which R.sup.7 is a hydrogen atom or a lower alkyl group, R.sup.8 is a hydrogen atom or a hydroxy group, and m and n are the same or different and is each 0 or 1, (B) 40 to 75% by weight of an alkyl acrylate, (C) 10 to 40% by weight of an alkyl methacrylate, and (D) 5 to 30% by weight of a monoethylenically unsaturated monomer having a carboxyl group; and a medium.

Abstract: The invention provides a magnetic coating composition capable of giving a magnetic recording medium having improved properties in respect of the dispersibility of the ferromagnetic particles in the vehicle resin and the surface properties of the magnetic recording medium coated therewith. The inventive magnetic coating composition is characteristic in the use of a specific vehicle resin having a polymeric molecular structure composed of the monomeric units of vinyl chloride, vinyl alcohol, amine-modified vinyl and, optionally, vinyl carboxylate and epoxy-containing a monomer in specified proportions.

Abstract: Heat exchanging device wherein plural number of support plates are provided at a required distance from one another, a plurality of through holes are formed on these support plates, a plurality of spirally corrugated heating tubes of a fluorocarbon resin are put in each of the through holes independently from one another and these heating tubes are held by elastic bushings in the support plates.

Abstract: A crosslinkable copolymer is prepared by the copolymerization of a first ethylenically unsaturated monomer and a second monomer substituted by a vinyl-containing cyclic organosilicon group such as ##STR1## in which Vi and Me denote vinyl and methyl groups, respectively. When such a copolymer is admixed with a crosslinking agent such as an organic peroxide and shaped with heating, the crosslinkable copolymer is crosslinked so that the shaped article is imparted with greatly improved properties.

Abstract: Heat exchanging device wherein plural number of support plates are provided at a required distance from one another, a plurality of through holes are formed on these support plates, a plurality of heating tubes of a fluorocarbon resin are put in each of the through holes independently from one another and these heating tubes are held by the support plates.

Abstract: A heating exchanging device comprising a first fluid retaining means; at least two opposed substantially V-shaped support plates, the plates being within the retaining means and having a plurality of holes; a plurality of heating tubes passing through said matrix of holes as to define a spiral path, and an upper support frame in parallel with a lower support frame for supporting said V-shaped support plates. The device may further comprise an I-shaped support plate disposed between said V-shaped support plates and connected centrally thereto, the upper and lower support frames being essentially centrally connected by the I-shaped plate and being connected proximate opposed terminal portions thereof by the V-shaped support plates. The support frame preferably has a steel core covered with an outer tube of fluorocarbon resin, the tube being heated and shrunk to provide intimate contact with the core.