Elastomeric composition

A technology of elastomers and compositions, applied in the field of low-permeability elastomer compositions, which can solve the problems of natural rubber loss of ideal properties, loss of processing properties, etc.

Inactive Publication Date: 2008-07-16
EXXONMOBIL CHEM PAT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While the barrier properties of elastomeric compositions are enhanced, the formation of nanocomposites tends to come at the expense of processability
[0007] Also, the incorporation of natural rubber in blends with these copolymers is problematic because some desirable properties are lost when natural rubber is added

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0095] Compositions 1-15 (Tables 3-5) illustrate the benefits of incorporating polybutene processing oils in blends of isobutylene copolymers containing halomethylstyrene moieties. Compositions 1, 6 and 11 represent halogenated isobutylene-p-methylstyrene copolymers containing varying amounts of halogenation and varying amounts of p-methylstyrene (PMS) (see Table 3). Incorporation of PARAPOL TM The compositions have improved air permeability while improving or maintaining processing properties such as green strength and fatigue-to-breakage ratio (Tables 6-8).

[0096] Compositions 16-21 (Table 9) illustrate the benefits of incorporating polybutylene processing oils in blends of isobutylene-based polymers such as HSSB with another rubber such as natural rubber and exfoliated clay. Composition 16 is HSSB only (SBB-6222, 100phr), composition 17 is natural rubber and PARAPOL only TM (90phr SBB, 10phr natural rubber). Typically, halogenated rubbers such as HSSB have a desirably ...

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Abstract

The present invention is a composition including an isobutylene-based copolymer and polybutene. The copolymers may be mixed with an exfoliating compound and clay, the entire composition forming a nanocomposite. The clay may or may not have an additional exfoliating treatment present prior to mixing with the interpolymer. The composition of the invention has improved air barrier properties and processing properties, and is suitable as an air barrier. One embodiment of the invention is an elastomeric composition including at least one random copolymer of at least a C4 to C7 isomonoolefin derived unit, at least one filler, and polybutene oil having a number average molecular weight greater than 400. The copolymer may be selected from a halogenated poly(isobutylene-co-p-methylstyrene), a halogenated star-branched butyl rubber, or a halogenated butyl rubber, and mixtures thereof.

Description

field of invention [0001] The present invention relates to low-permeability elastomeric compositions which may contain nanoclays, and more particularly to a combination of isobutylene-based copolymers and fillers such as carbon black and clays and polybutylene processing oils to form innerliners such as tire innerliners thing. Background of the invention [0002] Bromobutyl and chlorobutyl rubbers are the polymers of choice for the air retention properties of tubeless tires. Similarly, where heat resistance or another important property is important, brominated isobutylene-paramethylstyrene copolymers (BIMS) as disclosed in US 5 162 445 and 5 698 640 are typically used. The choice of ingredients for a commercial elastomer formulation depends on the desired balance of properties as well as the application and end use. For example, in the tire industry, the processability of a tire plant's native (unvulcanized) compound versus the serviceability of a vulcanized rubber tire c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/28C08K5/01C08K3/34
Inventor A·J·狄亚斯G·E·琼斯D·S·特雷西W·H·沃德尔
Owner EXXONMOBIL CHEM PAT INC
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