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Elastomeric blend for air barriers

A technology of airtight layer and elastomer, applied in the direction of no separate air cushion, transportation and packaging, special tires, etc., can solve the problems of unfavorable airtight layer and high air permeability

Inactive Publication Date: 2005-09-14
EXXONMOBIL CHEM PAT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While Tsou et al. demonstrated improved green strength in certain compositions comprising the semi-crystalline polyethylene copolymer EXACT and naphthenic / aromatic processing oils, the same compositions showed higher air permeability, This is bad for innerliner applications

Method used

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  • Elastomeric blend for air barriers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0102] Example 1 is a comparative example, including 90 phr of SBB and 10 phr of natural rubber (NR), using 4 phr of rosin oil and 14 phr of naphthenic oil (CALSOL). This comparative example uses the same sequence and the same vulcanizing agent as in Example 2 to Example 5, and is cured at 150° C. for 20 minutes. Examples 2 to 5 included the same amount of elastomer as in Example 1, varying the amounts of naphthenic oil and plastomer. Example 2 includes plastomer and naphthenic oil. Examples 3 and 4 included plastomer and rosin oil alone, with no added naphthenic or aromatic oil; Example 5 included plastomer and polybutene processing oil, with no added naphthenic or aromatic processing oil. The amounts (phr) of the components present in the examples are summarized in Table 4, while Table 5 shows the vulcanization performance of the comparative examples and other examples.

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Abstract

The present invention provides a composition suitable for an air barrier such as an automotive tire innertube, innerliner, and aircraft tire innertube or innerliner, curing bladders, and other pneumatic devices. THe compositioncomprises an elastomer comprising C4 to C7 isoolefin derived units; and a plastomer, wherein the plastomer is a copolymer of ethylene derived units and C3 to C10 a-olefin derived units, the plastomer having a density of less than 0.915 g / cm3. In a desirable embodiment, naphthenic and aromatic oils are substantially absent from the composition. In another embodiment, a polybutene processing oil is present. Further, in yet another embodiment, a secondary rubber is alos present such as, for example, natural rubber or butyl rubber, or a butadiene-based rubber.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of provisional application 60 / 396,497, filed July 17, 2002, the entire disclosure of which is hereby incorporated by reference. technical field [0003] The present invention relates to a C-based 4 to C 7 Blends of polymers of isoolefins with semi-crystalline ethylene copolymers or plastomers using polybutene processing oils as additives in one aspect of the composition. technical background [0004] as isobutylene-based C 4 to C 7 A copolymer of isoolefins and multiolefins, halobutyl rubber is the polymer of choice for optimum air retention in passenger car, truck, bus and aircraft vehicle tires. For these specific applications, bromobutyl, chlorobutyl and halogenated star-branched butyls can be formulated. The choice of ingredients and additives for the final commercial formulation depends on the balance of properties required. That is, green (unvulcanized) rubber processing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C1/00B60C5/14C08F8/00C08K3/04C08K3/34C08L7/00C08L21/00C08L23/08C08L23/20C08L23/22C08L23/28C08L91/00
CPCC08L23/0815C08L7/00C08L23/283C08L91/00C08L21/00C08L23/22C08L2312/00C08L2666/06
Inventor G·E·琼斯A·A·伽鲁斯卡W·H·瓦德尔
Owner EXXONMOBIL CHEM PAT INC