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Inner liner for pneumatic tires, method for producing same, and pneumatic tire

A technology for pneumatic tires and inner liners, which is applied in the direction of pneumatic tires, special tires, tire parts, etc., can solve problems such as fracture and cracking, achieve easy and reliable manufacturing, maintain gas barrier properties, and suppress the increase in manufacturing costs Effect

Active Publication Date: 2014-03-19
KURARAY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of using ethylene-vinyl alcohol copolymer as the inner liner, although the effect of improving the internal pressure retention of the tire is good because of its excellent gas barrier properties, it is more elastic than butyl rubber, etc., which are commonly used in tires. The modulus is high, so it may break or crack due to the bending of the tire during driving

Method used

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  • Inner liner for pneumatic tires, method for producing same, and pneumatic tire
  • Inner liner for pneumatic tires, method for producing same, and pneumatic tire
  • Inner liner for pneumatic tires, method for producing same, and pneumatic tire

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Embodiment approach

[0317] The inner liner of the present invention is not limited to the above-mentioned embodiments. For example, other layers may be included in addition to the A layer and the B layer. The type of the resin composition constituting the other layer is not particularly limited, but a resin composition having high adhesiveness to the A layer and / or the B layer is preferable. As another layer, a layer having a molecular chain having the same hydroxyl group or the like as the gas barrier resin in the A layer or a functional group in the B layer (for example, a carbamate group or a urethane group in the molecular chain of TPU) is particularly preferable. isocyanate group) reacts to form a bonded functional group.

[0318] In addition, in the inner liner of the present invention, support layers may be laminated on both surfaces or one surface of the above-mentioned laminated body of eight or more resin layers. The support layer is not particularly limited, and may not be a resi...

manufacture example 1

[0321] (Manufacture example 1 [manufacture of EVOH1])

[0322] 20,000 parts by mass of vinyl acetate, 1,020 parts by mass of methanol, and 2,2'-azobis(4-methoxy-2,4-dimethyl valeronitrile) 3.5 parts by mass, after nitrogen substitution was carried out while stirring, ethylene was introduced and adjusted to an internal temperature of 60°C and an ethylene pressure of 59Kg / cm 2 , keep the temperature and pressure for 4 hours, stir to make it polymerized. Next, 10 mass parts of sorbic acid (SA) (0.05 mass % with respect to the input vinyl acetate) was dissolved in methanol, and it added as a 1.5 mass % solution. The polymerization rate was 30% with respect to the vinyl acetate charged. The copolymerization reaction solution was taken out and supplied, and methanol vapor was introduced from the bottom of the column to remove unreacted vinyl acetate from the top of the column to obtain a 40% by mass methanol solution of the copolymer. In this copolymer, the ethylene unit con...

manufacture example 2

[0324] (Manufacturing example 2 [manufacture of EVOH2])

[0325] 20,000 parts by mass of vinyl acetate, 1,020 parts by mass of methanol, and 2,2'-azobis(4-methoxy-2,4-dimethyl valeronitrile) 3.5 parts by mass, after nitrogen substitution was carried out while stirring, ethylene was introduced and adjusted to an internal temperature of 60°C and an ethylene pressure of 59Kg / cm 2 , keep the temperature and pressure for 4 hours, stir to make it polymerized. Next, 10 mass parts of sorbic acid (SA) (0.05 mass % with respect to the input vinyl acetate) was dissolved in methanol, and it added as a 1.5 mass % solution. The polymerization rate was 30% with respect to the vinyl acetate charged. The copolymerization reaction solution was taken out and supplied, and methanol vapor was introduced from the bottom of the column to remove unreacted vinyl acetate from the top of the column to obtain a 40% by mass methanol solution of the copolymer. In this copolymer, the ethylene unit co...

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Abstract

A purpose of the present invention is to provide an inner liner for pneumatic tires, which has excellent melt moldability and thus has high gas barrier properties and is capable of maintaining the characteristics such as the gas barrier properties even in cases where the inner liner experiences deformation such as stretching or bending when in use. Another purpose of the present invention is to provide a method for producing an inner liner having the above-mentioned characteristics, while suppressing increase of the production cost. The present invention is an inner liner for pneumatic tires, which comprises eight or more resin layers, and which is characterized in that: the inner liner comprises, as the resin layers, a layer (A) that is formed of a resin composition containing a gas barrier resin and a layer (B) that is arranged adjacent to the layer (A) and formed of a resin composition containing an elastomer; both of the elongational viscosity (EtaA) of the resin composition of the layer (A) and the elongational viscosity (EtaB) of the resin composition of the layer (B) at a predetermined temperature are 1,000 Pas or more; and the elongational viscosity ratio EtaA / EtaB is 0.2-10 (inclusive).

Description

technical field [0001] The present invention relates to an innerliner for a pneumatic tire having eight or more resin layers, a method for producing the same, and a pneumatic tire, in particular, an innerliner having excellent gas barrier properties, melt moldability, and durability, and its production A method and a pneumatic tire including such an inner liner. Background technique [0002] Today, laminated films having an ethylene-vinyl alcohol copolymer layer are used in applications such as food and medical packaging materials, taking advantage of their high gas barrier properties, stretchability, thermoformability, and the like. Recently, in order to improve various properties such as gas barrier properties, various multilayer structures in which a plurality of resin layers each having a thickness of a micrometer or submicrometer are laminated have been proposed. [0003] As a conventional multilayer structure in which a plurality of ethylene-vinyl alcohol copolymer re...

Claims

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Application Information

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IPC IPC(8): B60C5/14C08F8/00B29C48/18
CPCB60C5/14B29C47/06B60C2005/145C08F2800/10B60C1/0008C08L23/0861C08F8/12B29C48/18C08F218/08
Inventor 林七步才日笠正雄田中祐介北野秀树田中隆嗣天本哲生
Owner KURARAY CO LTD
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