Abstract:
Elastomer compositions having improved cut resistance useful for preparing the tread of tires particularly for large motortrucks or for off-road running, which compositions can be produced by compounding a particular petroleum resin in the amount of 5-40 weight parts, and more preferably 5-20 weight parts with 100 weight parts of styrene-butadiene elastomeric copolymer. The petroleum resin is a polymer of cyclopentadiene and/or dicyclopentadiene or copolymer thereof with an olefinic hydrocarbon copolymerizable therewith, and has a softening point of 50*-200*C and more preferably 80*-150*C and a bromine value of 40-150 and more preferably 50-150.
Abstract:
Novel copolymers in which acetylene and a conjugated diene compound are bonded linearly and randomly and the conjugated diene compound is bonded substantially in 1,4-structure, are produced by copolymerizing acetylene and the conjugated diene compound by means of a catalyst system consisting of dialkylaluminum chloride or a similar substance to said chloride and organic acid salts or organic complexes of nickel. Said random copolymers have a large number of diallyl type active methylenes due to acetylene-conjugated diene bond and therefore said copolymers have a high chemical reactivity and are used commercially broadly.
Abstract:
A butadiene-acrylonitrile alternating copolymer solution-type adhesive having 5-50 parts by weight of an adhesive composition composed of 100 parts by weight of a butadiene-acrylonitrile alternating copolymer having a degree of alternation of not lower than 92 and an intrinsic viscosity of not lower than 1.0 and containing no gel, which is prepared from butadiene and acrylonitrile in the presence of a catalyst consisting of a component (A) of a compound of metals of the groups IV-b and V-b in the Periodic Table and a component (B) of an organoaluminum compound, and 30-100 parts by weight of a phenol resin dissolved in 100 parts by weight of a solvent. This solution-type adhesive has excellent adhesion and storage stability and is used for adhering rubbers, plastics, fibers, woods and metals.
Abstract:
A belt device for collecting floating matter from a water surface comprising a pair of pulleys, one of which being arranged above the water surface and the other pulley being arranged below the water surface, and an endless belt loosely engaged with the pulleys and having a lower loosening portion inclined from a relative direction of water flow by an acute angle.
Abstract:
Light and rigid fiber glass reinforced plastic composite pipe consisting of an inner tube formed by winding glass fiber threads impregnated with a thermosetting resin on a mandrel by a filament winding process, a rib wound around the inner tube spirally at an appropriate pitch, said rib being produced by mixing an unsaturated polyester resin, magnesium oxide, a cross-linking agent, a filler and a diluting agent and simultaneously thickening the mixture at a temperature of 20*-60*C, and an outer layer covering the inner tube and the rib, which is composed of glass fiber threads impregnated with a thermosetting resin.
Abstract:
A process for preparing oxazolidones is provided by reacting an epoxide with an isocyanate in the presence of a catalytic amount of a magnesium halide/phosphine oxide complex. The reaction products thus produced can be used in a variety of applications. The polyoxazolidones obtained from polyepoxides and polyisocyanates can be used as liquid rubber materials, high temperature resistant resinous materials and the like.
Abstract:
A safety fuel tank having high suction ability comprises a tank body, a foamed body having open-cells and being filled in said tank body, a suction pipe extending vertically through the foamed body and terminating at the bottom of the tank body and a collector tank projected downward from the bottom of the tank body. Said collector tank extends across the width of the tank body.
Abstract:
A safety tire having an inner tire defining a first tire chamber therein and a tubeless outer tire defining a second tire chamber between the inner and outer tires, which second chamber is isolated from the first chamber. A breaker consisting of rubberized cord plies is disposed on crown portion of the inner tire, so as to produce a sufficient cornering power for running at 100 Km/hour or faster even after breakdown of said outer tire.
Abstract:
An oil fence having a unidirectional flexibility, comprising a plurality of rigid floats which are swingably connected by hinge means. Planar skirts are connected to the floats so as to define at least one continuous oil fence wall thereby.
Abstract:
A floating breakwater in which the floating body is formed by housing a floating material as a floating source and a weighting material as a source for increasing weight in a hollow shell composed of a rigid material and provided with a projection on the upper portion. The specific gravity of the floating body is made to be 0.15 - 0.75 owing to the floating material and the weighting material.