Abstract: A process for producing a pneumatic tire having high uniformity with a carcass ply formed of polyester cord, including the steps of: (a) spinning polyester at a tension at the solidifying point of melt polyester between 1.5.times.10.sup.7 and 7.5.times.10.sup.7 dyne/cm.sup.2 ; (b) drawing the polyester into a filament at a draw ration of 2.0 to 3.0; (c) twisting a polyester filament at a twist coefficient of from 800 to 2,500; and then (d) heat treating the filament so that the dimension unstabilizing factor is 8.5 or less. The polyester filament is made of polyester having an ethylene terephthalate component of at least 85 mol % and a high degree of polymerization such that the intrinsic viscosity is at least 0.8, and the ratio of the birefringence of the surface portion to that of the central portion in the polyester filament is from 1.03/1 to 1.15/1; the twist coefficient is represented by T.times..sqroot.

Abstract: A composition for tires containing at least 30% star shaped random styrene-butadiene copolymer obtained by solution polymerization, having a styrene content of less than 20% and more than 10% and a vinyl content of less than 50% and more than 40%, the composition value X of said copolymers being in a range of 26 to 39 obtained by using the equation; ##EQU1## wherein BR is the butadiene component, the glass transition temperature being a single one below -50.degree. C. and lower than estimated glass transition temperature following Gordon-Taylor equation by 5.degree. to 10.degree. C. and a cured composition showing loss modulus of lower than 1.times.10.sup.-7 dyn/cm.sup.2 and a ratio of rolling resistance to wet grip being smaller than 0.82.

Abstract: A fluid-damping vibration-isolating support device comprising a main support body having a rubber base member and a closed enclosure internally thereof; and a partition plate dividing the enclosure into two chambers which intercommunicate through an orifice and are filled with a liquid. The partition plate comprises a separator member and a stopper member. The separator member is formed of an outer peripheral thick wall portion having an orifice and an inner thin flat plate portion having at least one through-hole. The stopper member has two opposed plate sections provided so as to cover the through-hole and is captured to the separator member slightly movably to the degree that the plate sections are in contact with or separate from both faces of the flat plate portion. The stopper member serves to close upon low frequency vibration and open upon high frequency vibration, so that in the high frequency region rise of hydraulic pressure can be suppressed and dynamic spring rate can be lowered.

Abstract: A process for producing a pneumatic tire having high uniformity with a carcass ply formed of polyester cord, including the steps of: (a) spinning polyester at a tension at the solidifying point of melt polyester between 1.5.times.10.sup.7 and 7.5.times.10.sup.7 dyne/cm.sup.2 ; (b) drawing the polyester into a filament at a draw ration of 2.0 to 3.0; (c) twisting a polyester filament at a twist coefficient of from 800 to 2,500; and then (d) heat treating the filament so that the dimension unstabilizing factor is 8.5 or less. The polyester filament is made of polyester having an ethylene terephthalate component of at least 85 mol % and a high degree of polymerization such that the intrinsic viscosity is at least 0.8, and the ratio of the birefringence of the surface portion to that of the central portion in the polyester filament is from 1.03/1 to 1.15/1; the twist coefficient is represented by T.times..sqroot.

Abstract: A method for adhering an urethane elastomer to a metal is disclosed, and comprises applying a thermosetting resin containing a flaky inorganic filler to a surface of a metal matrix, curing the thermosetting resin layer, applying an isocyanate-terminated prepolymer thereon, curing the prepolymer layer, and casting an urethane elastomer stock solution over the cured laminate. The adhesion obtained is excellent in durability against acids.

Abstract: A vibration-absorbing engine mounting device with fluid damping which comprises: an upper mounting member, a lower mounting member, a rubber wall body interposed between both the mounting members with its upper and lower portions being air-tightly bonded to the upper and lower mounting members, respectively, a block damper transversely provided in the rubber wall body, and a capsule encased in a space enclosed by the former four members, thus defining a closed chamber enclosed by the former five members. The capsule comprises an exterior rigid case, an interior sealed bag encapsulated in the rigid case, defining a sacciform chamber and an orifice member entering the former two. The closed chamber and the sacciform chamber are filled with fluid, whereby they are put in communication with one another by the passage of fluid via the orifice member.

Abstract: A carcass rubber composition for tires comprising a polymer blend of diene synthetic elastomer and natural rubber. Said diene synthetic elastomer contains a solution polymerization star shaped SBR, preferably, in the ratio of 20-50 percent. 1, 2 structure in the butadiene unit is preferably less than 50 percent. The styrene content is preferably 10-20 percent.

Abstract: A rubber composition having satisfactory adhesion brass plated steel cords which does not substantially degrade with high humidity comprising 0.5 to 5 parts by weight of cobalt salt and 0.1 to 5 parts by weight of 1,3,5-triazine-2,4,6-trithiol as the adhesive component; or further including as the adhesive component 0.5 to 5 parts by weight of resorcinol or substituted phenol-formaldehyde resin and 0.5 to 5 parts by weight of melamine derivative represented by the formula: ##STR1## wherein in the formula above R.sub.1, R.sub.2, R.sub.4 and R.sub.5 are radicals selected from the group consisting of --CH.sub.2 OH, --CH.sub.2 OCH.sub.3 and --CH.sub.2 OC.sub.2 H.sub.5 ; R.sub.3 is a radical selected from the group consisting of --OCH.sub.3 and --OC.sub.2 H.sub.5 ; R.sub.6 is a radical selected from the group consisting of --CH.sub.2 OCH.sub.3 and --CH.sub.2 OC.sub.2 H.sub.5 ; and wherein n equals integer from 1 to 5.

Abstract: A pneumatic radial tire having highly durable bead structure is disclosed. One or more carcass ply layers of steel cords are turned up around a bead core from the inside to the outside. A reinforcing strip of steel cords is positioned outwardly adjacent to the turn-ups of carcass plies. A bead filler of approximately triangular sectional shape is disposed at the region enclosed by the carcass plies, the turn-ups of the carcass plies and the reinforcing strip of steel cords. The bead filler comprises high hardness rubber stock and medium hardness rubber stock. A cap of organic textile cord fabric covers an upper end of the reinforcing strip of steel cords. A fin-shaped rubber buffer having a hardness lower than that of the medium hardness rubber stock by 3.degree. to 20.degree. is disposed radially outwardly of the capped end and axially outwardly adjacent to the medium hardness rubber stock.

Abstract: A pneumatic radial tire having highly durable bead structure is disclosed. One or more carcass ply layers of steel cords are turned up around a bead core from the inside to the outside. A reinforcing strip of steel cords is positioned outwardly adjacent to and without extending radially outwardly beyond the turn-ups of carcass plies. A bead filler of approximately triangular sectional shape is disposed at the region enclosed by the carcass plies and the turn-ups of the carcass plies. The bead filler comprises high hardness rubber stock and medium hardness rubber stock. A cap of organic textile cord fabric covers an upper end of the carcass plies. A fin-shaped rubber buffer having a hardness lower than that of the medium hardness rubber stock by 3.degree. to 20.degree. is disposed radially outwardly of the capped end and axially outwardly adjacent to the medium hardness rubber stock. A reinforcing strip of organic textile cords may be further disposed outwardly adjacent to the reinforcing strip of steel cords.

Abstract: A process for the production of a porous ceramic mold is described, compsiging adding about 40 to 60 parts by weight of water to 100 parts by weight of a ceramic material, mixing the thus-formed ceramic slurry with about 20 to 40 parts by weight of a hydrophilic urethane prepolymer having a free isocyanate group content of from about 4% to 7% by weight, reacting and foaming the resulting mixture after the introduction thereof into a mold, drying the thus-formed foamed urethane molded article, and combusting very slowly and sintering the dried foamed urethane molded article to produce a porous ceramic molded article.

Abstract: A pneumatic radial tire having highly durable bead structure is disclosed. A carcass ply layer of organic textile cords is turned up around a bead core from the inside to the outside. A reinforcing strip of steel cords is positioned outwardly adjacent to the turn-ups of carcass plies. An organic textile cord fabric is disposed outwardly adjacent to the reinforcing strip of steel cords. A bead filler of approximately triangular sectional shape is disposed at the region enclosed by the carcass plies, the turn-ups of the carcass plies and the reinforcing strip of steel cords. The bead filler comprises high hardness rubber stock and medium hardness rubber stock. A cap of organic textile cord fabric covers an upper end of the reinforcing strip of steel cords. A fin-shaped rubber buffer having a hardness lower than that of the medium hardness rubber stock by 3.degree. to 20.degree. is disposed radially outwardly of the capped end and axially outwardly adjacent to the medium hardness rubber stock.

Abstract: An automotive tire tread having a low rolling resistance including a cap tread rubber and a base tread rubber wherein the value of the loss tangent of the cap tread rubber is not more than 0.24 and the value of the resilience of the cap tread rubber is more than 60%. In addition, the value of the loss tangent of the base tread rubber should be less than that of the cap tread rubber.

Abstract: A radial ply tire having structure thereon for minimizing the wear characteristic of the lateral edges of the tread. The tire has a central zone which consists of a curved surface at a radius R.sub.1 to a specified distance from the centerline of the tire and a curved surface at a radius R.sub.2 over the near-shoulder zones from the lateral edges of the central zone to a lateral boundary of the lateral shoulder on the tire. The near-shoulder zones on the tire have an intermediate position C thereon located at a specified distance (W.sub.1) from the center line so that the specified position (W.sub.1) is also spaced a further specified distance (d) radially outward from a position (A) located at the aforesaid specified distance (W.sub.1) on an imaginary curved surface extrapolated from the radius of curvature R.sub.1.

Abstract: Tubeless tires for trucks and buses have radial carcass plies of polyester cords turned up around bead wires from the lateral inside to the lateral outside of the carcass walls. Polyester cords of not less than 4,500 d are used for the carcass plies. The compressibility of an inner-bead portion, i.e. that portion of the bead between the bead wire and a bead base is 4% to 35% of the entire inner-bead portion and 7% to 70% of the rubber material portion thereof. The most preferable compressibility is 15% to 20% as to the entire inner-bead portion and 30% to 35% as to the rubber material portion.

Abstract: A rubber composition for a side wall of tires comprising a polymer blend of 20-100 parts by weight of solution polymerization star shaped SBR and 80-0 parts by weight of natural rubber and/or diene synthetic rubber. The glass transition temperature (Tg) of said star shaped SBR is preferably less than -50.degree. C. Styrene content in said star shaped SBR is preferably less than 20% parts by weight.

Abstract: A flat crown type of tubeless radial tire for trucks or buses to be mounted on a frusto-conical rim comprising a carcass of organic fiber cord plies and a belt of metallic cords, wherein a region having a small thickness of the sidewall portion is made sufficiently wide to ensure a flexibility, thicknesses at the bead portion are secured in sufficient dimensions to ensure a stiffness of it, and the intermediate region from the sidewall to bead is shaped and profiled, when the tire is as-molded, in a smooth line of two curves of reverse curvature, one of which on the sidewall side defines a negative curve and the other of which on the bead side a positive curve.

Abstract: A rubber bearing device having air damping capacity which comprises upper and lower fitments;a rubber cylindrical body interposed between the fitments defining an air chamber capable of volume-changing;a rubber piston shaped body whose shaft is fitted hermetically in the cylindrical body and is firmly bonded to the upper fitment, said piston-shaped body being provided in the air chamber to divide it into upper and lower air chambers, said upper and lower air chambers being adapted to release air therefrom or to admit air thereto through an orifice; anda depression diaphragm member provided associating with one or both of the chambers, said diaphragm member being capable of decreasing the magnitude of effective volume change by a definite magnitude.

Abstract: A pneumatic radial-ply tire having a tread constructed of at least two kinds of rubber which is capable of attaining both braking performance and rolling resistance. The tread portion is constructed so that the tread center zone is comprised of a rubber having a low hysteresis loss and the tread side zones adjacent to the center zone on both sides thereof or the outer layers of them are each comprised of a rubber having a high hysteresis loss; the tread center zone and the tread side zones are disposed in parallel to each other in the circumferential direction or the tread side zones are each disposed adjoining to the tread center zone and in a superposing manner.

Abstract: The present invention relates to a pneumatic safety tire, which is provided with a ring-shaped projection of high rigidity along its circumferential direction, outside of at least one bead of the pneumatic tire, wherein the projection has a smaller diameter than the diameter of the rim flange to which the tire is fitted. The ring-shaped projection is designed so that it projects to the outside along the rim flange, and moreover, the tire is adhered integrally by vulcanization together with two ring-shaped elastic reinforcements and halogenated butyl rubber-containing protective layer in the inside of the tire at each position corresponding to the portion from the sidewall to the adjacent shoulder.