摘要:
Tires for vehicle wheels having reduced environmental impact and the components thereof, in particular reinforcing structural elements such as carcass structures, belt structures, flippers and chafers, include elongated reinforcing elements treated with resorcinol and formaldehyde-free cross-linkable adhesive compositions. The adhesive compositions include at least a) a rubber latex, at least b) an epoxide and at least c) a polyamine with molecular weight higher than 190 Daltons, including at least two amino groups selected from primary —NH2 and secondary —NH— amino groups. In the structural element, these compositions confer an adhesion between cords and compounds that is comparable to, if not better than, the traditional RFL system in use in this sector. Furthermore, by suitably modifying the compound compositions in the reinforced structural elements and, possibly, also in the other elastomeric components of the tire, it is possible to manufacture tires while avoiding the use of toxic chemicals, such, as resorcinol and formaldehyde.
摘要:
A rubber composition comprising a diene rubber, a tackifier comprising a resin having a weight average molecular weight of from 1,500 to 2,500, and a wax is disclosed. The wax contains from 20.0 to 40.0 mass % of a linear saturated hydrocarbon having from 25 to 30 carbon atoms, from 8.0 to 18.0 mass % of a linear saturated hydrocarbon having from 35 to 40 carbon atoms, and from 1.0 to 6.0 mass % of a linear saturated hydrocarbon having 45 or more carbon atoms. The amount of the tackifier added is larger than the amount of the wax added.
摘要:
A method of production of a modified conjugated diene rubber including a first step of polymerizing a monomer containing at least a conjugated diene compound by using a polymerization initiator in an inert solvent so as to obtain a conjugated diene polymer having an active end, and a second step of causing a compound represented by a following formula (1) to react with the active end of the conjugated diene polymer having an active end: wherein, in formula (1), each of R1 to R3 independently is an alkyl group having 1 to 4 carbon atoms, R4 is a hydrocarbon group containing an aromatic ring and having 6 to 10 carbon atoms, R5 is an alkyl group having 1 to 6 carbon atoms, and “n” is an integer of 0 to 10.
摘要:
A rubber composition for a tire rim cushion or rubber finishing contains a diene rubber and a filler containing a carbon black. The diene rubber contains a natural rubber and/or an isoprene rubber, and a modified polymer that is obtained by reacting a nitrone compound with a double bond of a conjugated diene polymer. The content of the natural rubber and/or the isoprene rubber in the diene rubber is from 30 to 60 mass %, the content of the modified polymer in the diene rubber is from 8 to 70 mass %, the content of the filler is from 60 to 90 parts by mass per 100 parts by mass of the diene rubber, and the nitrogen adsorption specific surface area of the carbon black is from 60 to 150 m2/g. Such rubber composition has excellent low heat build-up and ozone resistance when formed into a tire.
摘要:
The present invention aims to provide a rubber composition for a clinch or chafer which enables to improve the rim chafing resistance, elongation at break, handling stability, and fuel economy in a balanced manner, and to reduce the number of broken spews in tire demolding; and a pneumatic tire produced using the rubber composition. The rubber composition for a clinch or chafer includes 100 parts by mass of a rubber component; 1.2 to 2.9 parts by mass of zinc oxide; and 2.2 to 4.0 parts by mass of stearic acid, the rubber component including 15 to 80% by mass of a butadiene rubber and 15 to 50% by mass of an isoprene-based rubber based on 100% by mass of the rubber component.
摘要:
The present invention is directed to an article of manufacture having a wire-reinforced component comprising (A) a metallic wire; and (B) a rubber composition contacting the wire, the rubber composition comprising (1) a diene based elastomer; and (2) a tin(II) carboxylate salt.
摘要:
Provided is a rubber composition for a tire soft stiffener improved in a crack resistance and a low heat generation, wherein carbon black (A) contained in the rubber shows specific particle size distribution behavior in an aggregate mass distribution curve, and the composition contains at least one compound selected from carbon black coupling agents consisting of bismaleimide (B), alkylidene hydrazide (C), disulfane (D) and carboxylic hydrazide (E), and a heavy-duty tire produced by using the above rubber composition is further provide.
摘要:
A run flat tire having a side reinforcing rubber part is disclosed. The side reinforcing rubber part is formed by a rubber composition having a ratio (M50H/M50N) of tensile stress (M50H) in 50% elongation at a measurement temperature of 100° C. to tensile stress (M50N) in 50% elongation at a measurement temperature of 23° C. of from 1.0 to 1.3. A ratio (M50H/M50F) of tensile stress (M50H) in 50% elongation at a measurement temperature of 100° C. of the rubber composition forming the side reinforcing rubber part to tensile stress (M50F) in 50% elongation at a measurement temperature of 100° C. of a rubber composition forming a bead filler is from 0.5 to 1.3.
摘要:
A tire includes a pair of beads, a carcass, chafers, an insulation, and cushion layers. Each bead includes a core positioned inward of the bead in a radial direction. At an inside of the core in the radial direction, the insulation is laminated on the chafers so as to be located outward of the chafers in the radial direction. Each cushion layer is laminated on the insulation so as to be located outward of the insulation in the radial direction. The insulation and the cushion layer are formed from respective crosslinked rubbers different from each other. A compressive elastic modulus Eα* of the crosslinked rubber of the cushion layer is smaller than a compressive elastic modulus Eβ* of the crosslinked rubber of the insulation.