Multilayer body, method for producing the same, inner liner for pneumatic tire and pneumatic tire

A technology for pneumatic tires and laminates, which is applied in the fields of laminates and their production, as well as inner liners for pneumatic tires and pneumatic tires, and can solve problems such as large tire internal pressure retention, cracking, and reduced internal pressure retention. question

Inactive Publication Date: 2009-08-26
BRIDGESTONE CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, when ordinary EVOH is used as an inner liner, cracks and cracks may be caused due to bending deformation because the elastic modulus of ordinary EVOH is very high compared with rubber generally used for tires, although it improves tire inner lining. The effect of pressure retention is large
Therefore, in the case of using the inner liner made of EVOH, the internal pressure retention before use of the tire is greatly improved, but the internal pressure retention after use of the tire subjected to bending deformation during tire rotation is compared with that before use may be reduced

Method used

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  • Multilayer body, method for producing the same, inner liner for pneumatic tire and pneumatic tire
  • Multilayer body, method for producing the same, inner liner for pneumatic tire and pneumatic tire
  • Multilayer body, method for producing the same, inner liner for pneumatic tire and pneumatic tire

Examples

Experimental program
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Effect test

Synthetic example 1

[0131] The pressure reaction tank was charged with 2 parts by mass of an ethylene-vinyl alcohol copolymer having an ethylene content of 44 mol% and a saponification degree of 99.9% (MFR at 190°C under a load of 2160 g: 5.5 g / 10 minutes) and N -8 parts by mass of methyl-2-pyrrolidone, which was heated and stirred at 120°C for 2 hours to completely dissolve the ethylene-vinyl alcohol copolymer. 0.4 parts by mass of propylene oxide as an epoxy compound was added to the resulting solution, and heated at 160°C for 4 hours. After the heating is completed, the reaction material is settled in 100 parts by mass of distilled water, and N-methyl-2-pyrrolidone and unreacted propylene oxide are washed off with a large amount of distilled water, thereby obtaining a modified ethylene-vinyl alcohol copolymer. Then, the ethylene-vinyl alcohol copolymer thus modified is finely pulverized to a particle size of about 2 mm in a pulverizer, and washed thoroughly with a large amount of distilled water a...

Synthetic example 2

[0138] Except for using an ethylene-vinyl alcohol copolymer having an ethylene content of 32 mol% and a saponification degree of 99.9% (MFR at 190°C under a load of 2160 g: 7.0 g / 10 minutes) instead of having an ethylene content of 44 mol% and saponification The modified ethylene-vinyl alcohol copolymer was synthesized in the same manner as in Synthesis Example 1, except for the ethylene-vinyl alcohol copolymer (MFR at 190°C: 5.5 g / 10 minutes under a load of 2160 g) of 99.9%, So as to get the ball. The resulting modified ethylene-vinyl alcohol copolymer had a Young's modulus at 23°C of 1700 MPa.

Synthetic example 3

[0140] The maleic anhydride modified and hydrogenated styrene-ethylene-butadiene-styrene block copolymer was synthesized according to known methods to obtain pellets. The resulting maleic anhydride-modified and hydrogenated styrene-ethylene-butadiene-styrene block copolymer has a Young's modulus of 3MPa at 23°C, a styrene content of 20% and an amount of maleic anhydride It is 0.3meq / g. Also, the Young's modulus was measured in the same manner as in Synthesis Example 1.

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Abstract

Disclosed is a multilayer body (1) which is obtained by joining a resin film layer (D)(2) with a rubber-like elastic layer (E)(3) through an adhesive layer (F)(4). The resin film layer (D)(2) contains at least a layer composed of a resin composition (C) wherein a soft resin (B) having a Young's modulus at 23 DEG C lower than that of a thermoplastic resin (A) is dispersed in a matrix composed of the thermoplastic resin (A). By using, for the adhesive layer (F)(4), an adhesive composition (I) obtained by blending not less than 0.1 part by mass of at least one of a maleimide derivative (H) having two or more reactive moieties in a molecule and poly-p-dinitrobenzene per 100 parts by mass of a rubber component (G), the multilayer body (1) can have good workability during production and excellent separation resistance.

Description

Technical field [0001] The present invention relates to a laminate, a method for producing the same, an inner liner for a pneumatic tire, and a pneumatic tire using the laminate or the inner liner, and more particularly to a laminate having good processability in production and excellent peel resistance The laminated body and the inner liner for pneumatic tires that have excellent gas barrier properties and flexibility resistance and can reduce tire weight while improving internal pressure retention in new tire products and after running. Background technique [0002] Heretofore, a rubber composition using butyl rubber, halogenated butyl rubber, etc. as the main raw material has been used for an inner liner provided as an air barrier layer in the inner surface of the tire to maintain the internal tire pressure. However, because such rubber compositions using such butyl rubber as the main raw material have low air barrier properties, when the rubber composition is applied to the i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C5/14B32B25/08
CPCB60C1/0008B32B7/02B29D2030/0682B29D30/0681B32B7/12C08L25/18C08L23/283B32B25/08B60C5/14C08K5/16B60C2005/145B32B25/14B32B25/18B32B27/08B32B27/16B32B27/304B32B27/306B32B27/34B32B27/36B32B27/40B32B2255/10B32B2255/26B32B2264/102B32B2264/108B32B2274/00B32B2307/50B32B2307/54B32B2307/7242B32B2605/00Y10T152/10495Y10T428/31511C08K2201/008C08L2666/06
Inventor 野原大辅加藤大辅高桥祐和中川大助矶山晃太渡边知行池田薰
Owner BRIDGESTONE CORP
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