Abstract:
Provided is a thermoplastic resin composition for the inner liner of pneumatic tires, which has low air permeability and a small percent change in air permeability from fatigue. A thermoplastic resin composition obtained by dispersing a modified rubber having an acid anhydride group or an epoxy group into a polyamide resin and an ethylene vinyl alcohol copolymer, the thermoplastic resin composition being characterized in that the ratio of the polyamide resin to the ethylene vinyl alcohol copolymer is between 47/53 and 61/39. The percent change in air permeability of the thermoplastic resin composition in the present invention when subjected 1 million times to 20% elongation strain at room temperature is 1.30 times or more. Additionally, a pneumatic tire using a film comprising the thermoplastic resin composition in the present invention as an inner liner has a percent change in air leakage of 1.30 times or less at room temperature after going 70,000 km.
Abstract:
Disclosed is a process for producing a thermoplastic elastomer composition having a matrix phase comprising a polyamide and an ethylene/vinyl alcohol copolymer and a disperse phase comprising a rubber composition, by which gelation by a reaction between a polyamide and an ethylene/vinyl alcohol copolymer can be inhibited and the dispersion of the rubber composition can be good. In the process, the polyamide resin and the rubber composition are melt-blended to the extent necessary for the rubber composition to form a disperse phase, and then the ethylene/vinyl alcohol copolymer is added and further melt-blended together.
Abstract:
An object of the present invention is, in a thermoplastic elastomer composition in which a modified rubber is filled and dispersed in a polyamide resin matrix in order to improve the low-temperature durability of the polyamide resin, to reduce the extrusion load during extrusion molding thereof into a film without deteriorating the low-temperature durability. The present invention is a thermoplastic elastomer composition (E) comprising a modified polyamide resin (C) and a modified rubber (D) dispersed in the modified polyamide resin (C), the modified polyamide resin (C) being a resin obtained by melt-blending an polyamide resin (A) and a compound (B) capable of reacting with a terminal amino group of a polyamide resin, wherein the modified rubber (D) has an acid anhydride group or epoxy group and is dynamically cross-linked by a compound (F) having at least one disulfide bond and at least two amino groups. This thermoplastic elastomer composition can be suitably used in the production of an inner liner of a pneumatic tire.
Abstract:
An object of the present invention is, in a thermoplastic elastomer composition in which a modified rubber is dispersed and filled in an ethylene-vinyl alcohol copolymer matrix in order to improve the low-temperature durability of the ethylene-vinyl alcohol copolymer, to reduce the extrusion load during extrusion molding thereof into a film without deteriorating the low-temperature durability. The present invention is a thermoplastic elastomer composition comprising an ethylene-vinyl alcohol copolymer (A) and a modified rubber (B) dispersed in the ethylene-vinyl alcohol copolymer (A), wherein the modified rubber (B) has an acid anhydride group or epoxy group and is dynamically cross-linked by a compound (C) having at least two amino groups. This thermoplastic elastomer composition can be suitably used in the production of an inner liner of a pneumatic tire.
Abstract:
Provided is a method for producing thermoplastic resin compositions, the method comprising the step of melt-blending (A) a thermoplastic elastomer composition, obtained by dispersing (ii) an acid anhydride-modified or epoxy-modified rubber in (i) an ethylene-vinyl alcohol copolymer, with (B-1) a resin composition comprising at least one resin selected from (i) unmodified polyamide resins and modified polyamide resins or (B-2) a thermoplastic elastomer composition obtained by dispersing (ii) an acid anhydride-modified or epoxy-modified rubber in (i) at least one resin selected from unmodified polyamide resins and modified polyamide resins. Said thermoplastic elastomer composition has excellent gas barrier properties and the decrease in gas barrier properties associated with fatigue has been reduced.
Abstract:
Provided is a thermoplastic elastomer composition that can be suitably used for the inner liners of pneumatic tires and exhibits high air barrier properties and high fatigue durability. The present invention is a thermoplastic elastomer composition comprising a thermoplastic resin composition and a rubber composition dispersed in the thermoplastic resin composition, wherein the thermoplastic resin composition comprises a polyamide and an ethylene-vinyl alcohol copolymer or a poly(vinyl alcohol), the rubber composition comprises a halogenated isoolefin-p-alkylstyrene copolymer and is cross inked. The thermoplastic resin composition preferably comprises 1 to 25% by weight of the ethylene-vinyl alcohol copolymer or the poly(vinyl alcohol). The thermoplastic elastomer composition preferably comprises 100 parts by weight of the thermoplastic resin composition and 80 to 200 parts by weight of the halogenated isoolefin-p-alkylstyrene copolymer.
Abstract:
An attachment construction for attaching a front loader having booms to a front of a tractor vehicle body is disclosed. The construction includes a pair of support tables projecting from the front portion of the tractor body to the right and left outer sides thereof, an engine constituting the vehicle body being disposed forwardly of the support tables, a front axle frame being secured to right and left sides of the engine, a pair of main frames disposed erect on the respective support tables for supporting the booms, and a pair of attaching brackets secured to right/left inner ends of the respective support tables for attaching the support tables to the vehicle body. Each attaching bracket includes a front attaching portion secured to the front axle frame and a rear attaching portion projecting rearwardly of the support table associated therewith and secured to a fore-and-aft intermediate portion of the vehicle body.
Abstract:
A work vehicle with a front loader is disclosed. The work vehicle includes a traveling control section having an operator's seat, a hood provided forwardly of the traveling control section, a pair of masts provided on right and left sides of the hood, a pair of booms projecting forwardly from upper ends of the masts and an implement detachably connected to the booms. An upper face of the hood is inclined downwardly from its rear upper portion to its front upper portion. The inclined upper face is located adjacent a downward line of sight from an operator's space in the traveling control section to a connecting portion between each boom and the implement.
Abstract:
Provided is a thermoplastic elastomer composition comprising a polyamide resin and a modified rubber, in which low temperature resistance is improved. The thermoplastic elastomer composition comprising the polyamide resin and the modified rubber having an acid anhydride group or an epoxy group is characterized in that the modified rubber having an acid anhydride group or an epoxy group is modified with a secondary amine. The secondary amine is preferably a compound having a structural formula: R1—NH—R2, in which R1 is a linear alkyl group having 1 to 30 carbon atoms and R2 is a hydrocarbon group having 1 to 30 carbon atoms or a hydrocarbon group having 1 to 30 carbon atoms and having a hydroxyl group, a sulfonyl group, a carbonyl group or an ether bond.
Abstract:
Provided is a thermoplastic elastomer composition that can be suitably used for the inner liners of pneumatic tires and exhibits high air barrier properties and high fatigue durability. The present invention is a thermoplastic elastomer composition comprising a thermoplastic resin composition and a rubber composition dispersed in the thermoplastic resin composition, wherein the thermoplastic resin composition comprises a polyamide and an ethylene-vinyl alcohol copolymer or a poly(vinyl alcohol), the rubber composition comprises a halogenated isoolefin-p-alkylstyrene copolymer and is cross inked. The thermoplastic resin composition preferably comprises 1 to 25% by weight of the ethylene-vinyl alcohol copolymer or the poly(vinyl alcohol). The thermoplastic elastomer composition preferably comprises 100 parts by weight of the thermoplastic resin composition and 80 to 200 parts by weight of the halogenated isoolefin-p-alkylstyrene copolymer.