Abstract: A highly durable pneumatic tire comprising a carcass body formed by a number of laminated bias laid plies each including rubberized organic textile cords is disclosed. The carcass body is composed of at least two kinds of ply groups whose cords are the same in diameter, but different in the number of twists per unit length, the cords of the outermost ply group of the carcass having the number of twists which is 5% to 30% times larger than the number of twists of the ply group adjacent to the outermost ply group and located at the inner portion in the carcass and which is at least equal to the number of twists of the cords of the innermost ply group, and the cords of the innermost ply group of the carcass having the number of twists which is 5% to 30% times larger than the number of twists of the ply group adjacent to the innermost ply group and located at the outer portion in the carcass.

Abstract: A radial tire for heavy load vehicles comprising a tread portion having an outer contour composed of a relatively transversely flat main region and a conical region located at both end edges of the main region. A number of thin incisions extend across the conical region having inner ends not reaching to the inside of the main region.

Abstract: A highly durable pneumatic tire for aircraft is disclosed. The tire comprises a tread, a plurality of main grooves formed on the tread and extending substantially in the circumferential direction of the tire, and circumferential ribs spaced apart from each other by the main grooves. Among ribs coming into contact with ground under load, an outer contour of an outermost rib is made substantially discontinuous with respect to an outer contour of each of ribs adjoining the inside and outside of the outermost rib in the widthwise direction of the tire and is located at the inside of the outer contour of the adjoining ribs in the radial direction of the tire.

Abstract: A tire cord fabric suitable for reinforcement of rubber articles is disclosed. The tire cord fabric is manufactured by lengthwisely arranging a great number of cords as warp cords over a given width and then relatively coarsely interlacing them with weft yarns. In each selvage portion of the fabric is formed a joint part consisting of a special cord arrangement.

Abstract: Radial tires having improved irregular wear resistance, which are reinforced with a belt cord layer and a carcass cord layer, characterized in that as the embedding rubber of the belt cord layer, use is made of natural rubber, polyisoprene rubber or a blend rubber consisting of said rubber and less than 30 parts by weight of at least one of polybutadiene rubber and styrene-butadiene copolymer rubber and that for the ground contact area of the tread of tire, a rubber composition consisting of 100 parts by weight of styrene-butadiene copolymer rubber having a viscosity average molecular weight of not less than 2.times.10.sup.5 or a blend rubber consisting of more than 50 parts by weight of said copolymer rubber and at least one of natural rubber, polyisoprene rubber and polybutadiene rubber, 5-60 parts by weight of at least one of a liquid styrene-butadiene copolymer, a liquid polyisoprene polymer and a liquid polybutadiene polymer having a viscosity average molecular weight of 5.times.10.sup.3 -7.times.10.sup.

Abstract: A safety pneumatic tire which can improve running distance under punctured condition comprising an annular resilient reinforcing body having a maximum thickness corresponding to 4 to 9% of the tire maximum width and a JIS hardness of at least 60.degree. in which a ratio of the tire maximum width TW to the rim width RW is 1.0.ltoreq.TW/RW.ltoreq.1.3.

Abstract: An integrally molded oil boom comprising a float hose portion, a fin portion and a skirt portion is disclosed. In the oil boom, these portions are reinforced with a bias cut weave fabric.

Abstract: A fireproof laminate passing Grade 2 incombustibility according to Japanese Industrial Standard (JIS) A-1321 combustion test is disclosed. The laminate comprises a urethane modified polyisocyanurate foam as a core material and particular surface materials piled on both sides of the foam through self-adhesion of the foam and has a density of the core material of 0.02-0.04 g/cm.sup.3 and a total thickness of not more than 30 mm.

Abstract: Waste tires are used in production of cement using a rotary kiln for saving the use of fuel by feeding waste tires as such or crushed waste tire pieces to the position where the temperature of the exhaust gas in this apparatus is 600.degree.-1,400.degree. C. in an amount of not more than 60% of the total used fuel calculated as heat energy.

Abstract: A method of producing flameproof polyisocyanurate foams is disclosed. When the foam is produced by reacting an organic polyisocyanate with polyols as a modifying agent in the presence of an isocyanate trimerization catalyst, a blowing agent and other additives, a combination of particular low molecular weight diols with particular high molecular weight polyether polyols is used as the polyol in a special weight ratio and a special total amount per 100 parts by weight of the organic polyisocyanate in the presence of special combination of an alkali metal salt of a carboxylic acid and a tertiary amine compound as the catalyst.

Abstract: The flexible polyurethane foams having high flame resistance and smoke resistance can be produced by reacting a polyhydroxyl compound and a polyisocyanate with a urea derivative selected from the group consisting of(a) a compound represented by the general formula ##STR1## wherein at least one of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 represents hydroxylalkyl, alkoxyalkyl, alkyl and aryl groups and the remainder represents hydrogen atom, and(b) a urea-formaldehyde condensation product in the presence of a catalyst, a surfactant and a blowing agent.These polyurethane foams can easily provide the favorable foam sheets by compression-molding these foams under heating.

Abstract: A pneumatic tire for large size and high speed motor cycles is disclosed. The tire comprises a tread having a rib-block pattern defined by a central groove extending in a substantially circumferential direction of the tire at a center of a crown, a first circumferential groove adjacent to the central groove, a second circumferential groove arranged at that side of the first circumferential groove opposite to the central groove, which consists of a common portion united with the first circumferential groove and a non-common portion arranged circumferentially in a discontinuous manner independently of the common portion, and long and short transverse grooves arranged within regions located between the common portion and the tread edge on the one hand and between the non-common portion and the tread edge on the other hand.

Abstract: A tread reinforcing construction of a pneumatic radial tire for heavy-load vehicles is disclosed. The tread reinforcing construction comprises a combination of a rubberized belt superimposed about a rubberized carcass ply and at least one additional rubberized reinforcing layer interposed between the belt and a tread rubber. The additional rubberized reinforcing layer is composed of a reinforcing element embedded therein and formed of a helically formed filament or a bundle of at least two helically formed filaments assembled together without twisting at random.

Abstract: A method of producing polyurea foams is disclosed. The polyurea foam is produced by reacting an organic polyisocyanate with water in the presence of urea or by reacting a crude tolylene diisocyanate or a mixture of crude tolylene diisocyanate and crude diphenylmethane diisocyanate as an organic polyisocyanate with water in the presence of an amine catalyst, a silicone surfactant and, if necessary, a tin catalyst.

Abstract: Tire filling material having high resilience produced by curing a mixture of(a) a polyoxypropylene polyol having an OH equivalent molecular weight of 900-1,800 and a functionality of 2-4,(b) a polyisocyanate, and(c) a plasticizerin the presence of a catalyst where the equivalent ratio (NCO/OH) of isocyanate groups in component (b) to hydroxyl groups in component (a) is from 0.8-2.0 and the amount of component (c) is 10-200 parts by weight per 100 parts by weight of component (a).

Abstract: A pneumatic radial tire for heavy vehicles comprising in combination two wide zigzag circumferential main grooves for dividing a tread into a center region and two side regions, a narrow zigzag groove for dividing each region into two portions, and a branch groove located in the center region and connected to the main and narrow grooves to define blocks and satisfying the following requirements, i.e.(1) each main groove has a width which is 5 to 9% of the width of the tread, is substantially U-shaped in cross-section and has a wall defined by a bent or wavy line whose pitch is 0.3 to 1.3 times the width of the main groove and a swing width within a range from 0.1 to 1.0 times the width of the main groove, and(2) the branch groove has a depth which is 14 to 36% of the depth of the main groove.

Abstract: According to the present invention polyurethane foams, can be obtained as flame resistant and non-corrosive product. The invention specifies the foaming of raw material mixture comprising polyhydroxyl compound, polyisocyanate, blowing agent and etc. to be carried out in the presence of melamine powder added thereto as novel flame retardant, the final products being inexpensive and suitable to be used as structural material, etc.

Abstract: An adhesive composition which shows improved stickiness and adhesive property at room temperature and exhibits an excellent adhering ability in a short time is prepared by compounding(a) an acrylonitrile-containing copolymer having carbon-to-carbon double bond(b) a phenol-polysulfide resin(c) a metal oxide, and(d) a polyfunctional electrophilic reactive compound containing at least two electrophilic reactive groups.

Abstract: A perlite sound absorbing plate and a sound insulating wall constructed by arranging a number of said plates side by side and by assembling together into one integral body are disclosed. The plate is composed of a mixture including 1,000 cm.sup.3 by bulk volume of formed perlite particles each having a diameter of 0.1 to 7.0 mm, 100 to 140 g of cement, liquid rubber latex containing 5 to 20 g of solid ingredients and a suitable amount of water and produced by press molding with a compression ratio of 1.10 to 1.30. The wall is constructed by assembling a number of said plates each provided with a side groove with the aid of supporting columns and reinforcing plates, each having a ridge adapted to be engaged with the side groove of said plate.

Abstract: A soft polyurethane elastomer containing isocyanurate ring prepared by reacting polyoxypropylene polyol having an OH equivalent molecular weight of about 500-3,000, and a functionality of about 2-5, and polyisocyanate compound in the presence of tertiary amine catalyst, and if desired further combined with organic tin catalyst. This process is advantageous in facilitation of material control during curing reaction, low exothermicity and high thermal stability of the resulting polymer. Further the properties of the polymer are improved by using ethyleneoxide addition polyoxypropylene polyol instead of the above polymer and a specific tertiary amine as a catalyst. The elastomer thus prepared is significantly suitable for tire filling material.