Abstract: A propylene production method includes: a reaction step of supplying a fresh raw material and a recycled raw material to a reactor to obtain a crude product; a gas-liquid separation step of separating the crude product into a gas phase and a liquid phase; a propylene recovery step of recovering propylene from the gas phase; and a recycling step of recovering the recycled raw material from the liquid phase.

Abstract: In the tire 2, fillers 10 are layered over clinches 8 in portions outward of a carcass 14 in the axial direction. A carcass ply 50 is turned up around cores 44. Turned-up portions 50a are disposed between the fillers 10 and apexes 46. Each clinch 8 has a maximum thickness Tcx that is measured along a line normal to an inner surface, in the axial direction, of the clinch 8. A ratio of a thickness Tf1 of the filler 10 to a sum of the thickness Tf1 and the thickness Tcx is greater than or equal to 0.1 and not greater than 0.6. A percentage of a complex elastic modulus E*f of the filler 10 relative to a complex elastic modulus E*a of the apex 46 is greater than or equal to 70% and not greater than 125%.

Abstract: In the tire 2, fillers 10 are layered over clinches 8 in portions outward of a carcass 14 in the axial direction. A carcass ply 50 is turned up around cores 44. Turned-up portions 50a are disposed between the fillers 10 and apexes 46. Each clinch 8 has a maximum thickness Tcx that is measured along a line normal to an inner surface, in the axial direction, of the clinch 8. A ratio of a thickness Tf1 of the filler 10 to a sum of the thickness Tf1 and the thickness Tcx is greater than or equal to 0.1 and not greater than 0.6. A percentage of a complex elastic modulus E*f of the filler 10 relative to a complex elastic modulus E*a of the apex 46 is greater than or equal to 70% and not greater than 125%.

Abstract: The present invention relates to a method for producing propylene oxide comprising the step of producing propylene oxide from hydrogen, oxygen and propylene in the presence of a noble metal catalyst, a titanosilicate and an organic sulfur compound in a mixed solvent of water and a nitrile compound, wherein the titanosilicate has a pore composed 12- or more-membered oxygen ring.

Abstract: A pneumatic tire comprises a sidewall reinforcing rubber disposed axially inside the carcass in each of the sidewall portion, and in order improving the ride comfort during normal running without deteriorating runflat performance, the axially inner surface of the sidewall reinforcing rubber is provided with a circumferentially extending groove. When the tire is deflated, the groove in the ground contacting patch is closed and the sidewall reinforcing rubber supports the tire load. When the tire is inflated-normally, as the sidewall portion can be bent around the groove, the ride comfort is improved.

Abstract: A runflat tire having an improved ride comfort performance without impairing the runflat durability, and comprising a carcass 6 and sidewall-reinforcing rubber layers 9 having a crescent-shaped cross section disposed axially inward of carcass 6 in sidewall portion 3, wherein each sidewall-reinforcing rubber layer 9 comprises at least a radially outermost first rubber portion 9a and a second rubber portion 9b which is contiguous to the first rubber portion 9a and extends toward a bead portion 4, and the second rubber portion 9b has a complex modulus E*2 of at least 1.1 times the complex modulus E*1 of the first rubber portion 9a.

Abstract: A self-supporting runflat tire comprises; a carcass consisting of a single ply of organic fiber cords extending between bead portions and turned up around a bead core in each of the bead portions from the inside to the outside of the tire to form a pair of carcass ply turnup portions and a carcass ply main portion therebetween; a belt disposed radially outside a crown portion of the carcass; a sidewall reinforcing rubber layer disposed inside the carcass in the said sidewall portion and having a crescent-shaped cross sectional shape; a sidewall reinforcing cord layer of aramid cords disposed in the sidewall portion along the axially outer surface of the carcass ply main portion; and the carcass ply turnup portion extending radially outwardly beyond a maximum section width point of the carcass and terminated before the axial edge of the belt. Preferably, the aramid cord has a cord structure of 800 to 2200 dtex/2 and a twist number of from 30 to 70 turn/10 cm cord length. The cord count is 35 to 65 ends/5 cm.

Abstract: A pneumatic tire comprises a sidewall reinforcing rubber disposed axially inside the carcass in each of the sidewall portion, and in order improving the ride comfort during normal running without deteriorating runflat performance, the axially inner surface of the sidewall reinforcing rubber is provided with a circumferentially extending groove. when the tire is deflated, the groove in the ground contacting patch is closed and the sidewall reinforcing rubber supports the tire load. when the tire is inflated-normally, as the sidewall portion can be bent around the groove, the ride comfort is improved.

Abstract: A runflat tire having an improved ride comfort performance without impairing the runflat durability, and comprising a carcass 6 and sidewall-reinforcing rubber layers 9 having a crescent-shaped cross section disposed axially inward of carcass 6 in sidewall portion 3, wherein each sidewall-reinforcing rubber layer 9 comprises at least a radially outermost first rubber portion 9a and a second rubber portion 9b which is contiguous to the first rubber portion 9a and extends toward a bead portion 4, and the second rubber portion 9b has a complex modulus E*2 of at least 1.1 times the complex modulus E*1 of the first rubber portion 9a.

Abstract: A pneumatic tire for passenger cars which is improved in harshness noise without deteriorating the steering stability is disclosed, wherein a harshness factor HF is set in the range of from 3.2 to 3.5, the harshness factor HF is: HF=−0.133×(R1/100)+0.245×(R1/R2)−0.183×(Kv/10)+3.898 R1 is a radius of curvature (in mm) of a crown part of the tread profile, R2 is a radius of curvature (in mm) of shoulder parts of the tread profile, and Kv is the vertical spring constant in kN/mm of the tire.

Abstract: A pneumatic tire, which is improved in high speed durability, maintaining the required tread rubber thickness for mud and snow tires, is disclosed. The tire comprises a radial carcass and a belt including a breaker. The breaker comprises an inner ply and an outer ply, each composed of steel cords laid at an angle of 16 to 26 degrees to the tire equator. The outer breaker ply has a width WB2 of 0.7 to 0.75 times the tire cross sectional width TW. The inner breaker ply has a width WB1 of 1.03 to 1.10 times said width WB2 of the radially outer breaker ply. The tread profile comprises a crown portion defined by a circular arc having a single radius Rc of curvature of 1.4 to 2.6 times the tire cross sectional width TW and having the center on the tire equatorial plane, and a pair of tread shoulder portions continuing from the axially outer ends of said tread crown portion, each defined by a circular arc having a single radius Rs of curvature of 0.10 to 0.20 times the tire cross sectional width TW.

Abstract: A radial tire with reduced running noise, which comprises a belt comprising two cross plies of cords laid an angle of 10 to 40 degrees with respect to the tire equator, and a pair of axially spaced narrow dampers disposed radially outside of the belt. Each damper has a width L of 0.1 to 0.36 times the width WBO of the outer belt ply. The dampers are centered on two points P, respectively, each point P being spaced apart from the tire equator towards each side of the tire equator by a distance H of 0.1 to 0.25 times the width WBO of the outer belt ply. The axially inner edge of each damper is spaced apart from the the tire equator by a distance D of 0.05 to 0.2 times the width WBO of the outer belt ply. Each damper is formed by spirally winding a cord so that the windings or turns are substantially in parallel to the tire equator.

Abstract: A tire which is provided on a sidewall with an embossed mark (3), the embossed mark has an indent portion (5) and an outline portion (6), the outline portion has a top surface (6A) having a light color different from a dark color of the sidewall surface (2S) the bottom (5A) of the indent portion is provided with a rough surface to have a less luster than the sidewall surface, and preferably, the radial height of the mark is in the range from 15 mm to 60 mm, and the bottom of the indent portion is provided with a cross mesh pattern whose mesh pitches are 0.01 to 0.1 times the radial height H of the mark.