Laminate for inner liner, and tyre using same

A technology of laminate and air liner, applied in pneumatic tires, special tires, tire parts, etc., can solve the problems of insufficient adhesiveness of rubber layer and air liner, and achieve the effect of light weight and sufficient

Active Publication Date: 2015-04-08
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the adhesive layer made of resin can sufficiently secure the adhesiveness with the gas barrier layer, the adhesiveness with the adjacent rubber layer is insufficient and the airtight layer is displaced during molding and vulcanization , which leaves room for improvement

Method used

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  • Laminate for inner liner, and tyre using same
  • Laminate for inner liner, and tyre using same
  • Laminate for inner liner, and tyre using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] First, in a pressurized reaction vessel, 2 parts by mass of ethylene-vinyl alcohol copolymer (EVOH) having an ethylene content of 44 mol% and a degree of saponification of 99.9% (MFR at 190°C and a load of 2160g: 5.5g / 10 min.) and 8 parts by mass of N-methyl-2-pyrrolidone, and the mixture was heated and stirred at 120° C. for 2 hours to completely dissolve EVOH. To the mixture, 0.4 parts by mass of propylene oxide was added as an epoxy compound and then heated at 160° C. for 4 hours. After heating, the mixture was precipitated in 100 parts by mass of distilled water, and then N-methyl-2-pyrrolidone and unreacted propylene oxide were sufficiently washed with a large amount of distilled water to obtain modified EVOH.

[0046] Further, the obtained modified EVOH was pulverized into small particles with a size of about 2 mm by a pulverizer, and washed again with a large amount of distilled water. The pellets after washing were vacuum-dried at room temperature for 8 hours,...

Embodiment 2

[0059] (Synthesis of Soft Resin)

[0060] A maleic anhydride-modified hydrogenated styrene-ethylene-butadiene-styrene block copolymer was synthesized by a known method and pelletized. For the maleic anhydride-modified hydrogenated styrene-ethylene-butadiene-styrene block copolymer obtained, the Young's modulus at 23°C was 3 MPa, the styrene content was 20%, and the maleic anhydride The amount is 0.3meq / g. Young's modulus was measured in a similar manner to the modified EVOH described above.

[0061] (Manufacture of resin composition)

[0062] A resin composition was prepared by kneading the above-mentioned modified EVOH and a soft resin through a twin-screw extruder. Here, the content of the soft resin in the resin composition was 20% by mass. When the obtained sample of the resin composition was frozen and then cut into pieces by using a microtome to be measured by a transmission electron microscope, the average particle diameter of the soft resin in the resin composition...

Embodiment 3 to 9 and comparative example 1

[0073] Examples 3 to 9 and Comparative The inner liner of Example 1 was produced in a similar manner to that of Example 1 and the like.

[0074] For each test innerliner, its weight is measured. By using each test innerliner, a tire having a tire size of 195 / 65R15 was produced and the presence or absence of bladder peeling (peeling of the bladder due to innerliner-to-bladder adhesiveness) at the time of tire vulcanization was evaluated. Further, each test tire was mounted on a rim having a size of 6JJ to prepare a tire wheel, the applied air pressure was 160 kPa (relative pressure) and the tire load was 4.0 kN, and the tire was driven on an indoor drum tester at 80 km / h to evaluate the The presence or absence of peeling of the inner liner after the drum durability test. These results are listed in Tables 2 and 3 in combination.

[0075] [Table 2]

[0076]

[0077] *2) See above table 1

[0078] *3) Film 1: 7-layer film of EVOH and TPU, Film 2: 5-layer film of resin com...

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Abstract

Provided are: a laminate for an inner liner, the laminate using a resin film and being capable of ensuring sufficient adhesion between the resin film and an adjacent member such as a carcass; and a tyre which uses the laminate. The laminate for an inner liner comprises: a gas barrier layer (1) formed from a thermoplastic resin or from a resin material comprising a mixture of a thermoplastic resin and a thermoplastic elastomer; and rubber layers (2A, 2B) disposed on either side of the gas barrier layer (1). The rubber layers include at least a diene elastomer, the diene elastomer being modified by a compound comprising a functional group that is compatible with the resin material, and at least one of the rubber layers includes a cross-linking agent.

Description

technical field [0001] The present invention relates to a laminate for an inner liner (hereinafter, also simply referred to as a "laminate") and a tire using the laminate for an inner liner, and particularly to a tire using a resin material. Improvement of a laminate for an inner liner and a tire using the laminate for an inner liner. Background technique [0002] A rubber composition including butyl rubber, halogenated butyl rubber, or the like as a main raw material has conventionally been used for an airtight layer disposed on the inner side surface of a tire as an air barrier layer for maintaining the internal pressure of the tire. However, since such a rubber composition including butyl-based rubber as a main raw material has low gas barrier properties, when such a rubber composition is used as an inner liner, the inner liner needs to be thick to a certain extent, which is already a tire. Lightweight obstacles. [0003] On the other hand, there is a technique of using...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C5/14B32B25/08
CPCB32B2250/24B32B25/16B32B2307/7244B32B27/306C08L9/00B32B2274/00B32B25/08B60C1/0008B60C5/14B60C2005/145B32B7/00B32B7/04B32B25/00B32B25/04B32B25/14B32B27/00B32B27/06B32B27/08B32B27/18B32B27/26B32B27/28B32B27/30B32B27/38B32B1/00B32B1/08B32B2307/50B32B2307/7242B32B2307/7246B32B2307/7248B32B2405/00B32B2597/00B32B2605/00B29D30/0681B29D2030/0682Y10T428/24942Y10T428/269Y10T428/31826Y10T428/31924B32B25/12B32B2250/40B32B2250/03
Inventor 北野秀树千足英之
Owner BRIDGESTONE CORP
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