Functionalized elastomer nanocomposite

A technology of nanocomposite materials and elastomers, which is applied in the field of nanocomposite materials for airtight layers, and can solve the problems that the applicability of nanocomposite materials has not been proven or disclosed

Inactive Publication Date: 2005-09-07
EXXONMOBIL CHEM PAT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these elastomers have been functionalized to improve compatibility with other polymers or crosslinkability, the suitability of such functionalized polymers for nanocomposites has not been demonstrated or published.

Method used

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  • Functionalized elastomer nanocomposite
  • Functionalized elastomer nanocomposite
  • Functionalized elastomer nanocomposite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0120] The present invention will be better understood by referring to the following examples and tables, but the invention is not limited by said examples.

[0121] As a comparative example (Example 1), the permeability of an isobutylene-p-methylstyrene copolymer ("XP 50") containing 11.5 wt% p-methylstyrene units based on the weight of the polymer was measured. The permeability data are summarized in Table 2.

[0122] In Example 2, elastomer XP-50 (55 g) containing 11.5 wt % p-methylstyrene and succinic anhydride (3 g) were dissolved in dichloromethane (CH 2 Cl 2 )middle. Add AlCl to the solution 3 (8g). After stirring for 1.5 hours, the solution was poured into methanol containing 120 mmol HCl to yield a functionalized elastomer. The functionalized elastomer (40.5 g) was then melt blended in a Brabender at 160°C, followed by the addition of Cloisite 6A clay (4.5 g) and mixing for 10 minutes. Samples of this composition were pressed into films for testing permeability....

Embodiment 3

[0124] For Example 3, XP 50 (55 g) containing 11.5% p-methylstyrene and succinic anhydride (1.0 g) were dissolved in dichloromethane. To this solution was added AlCl 3 (2.7g). After stirring for 1.5 hours, the solution was poured into methanol containing 100 mmol HCl, and the resulting product was washed with acetone and dried under vacuum overnight. The modified product was then melt blended in a Brabender at 160° C. and mixed with 4.5 g of clay (Cloisite 6A) for 10 minutes at a rotor speed of 60 rpm. A sample of this composition was tested for permeability and the data are summarized in Table 2.

Embodiment 4

[0125] For Example 4, XP 50 (75 g) with 11.5% p-methylstyrene and succinic anhydride (1.03 g) were dissolved in CH 2 Cl 2 middle. To this solution was added AlCl 3 (2.8g). After stirring for 1.5 hours, the solution was poured into methanol containing 100 mmol HCl, and the resulting product was washed with acetone and dried under vacuum overnight. The functionalized elastomer was then melt blended in a Brabender at 160° C. and mixed with 4.5 g of clay (Cloisite 6A) for 10 minutes at a rotor speed of 60 rpm. A sample of this composition was tested for permeability and the data are summarized in Table 2.

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Abstract

An embodiment of the present invention is a nanocomposite comprising a clay and an elastomer comprising at least C2 to C10 olefin derived units; wherein the elastomer also comprises functionalized monomer units pendant to the elastomer. Desirable embodiments of the elastomer include poly(isobutylene-co-p-alkylstyrene) elastomers and poly(isobutylene-co-isoprene) elastomers, which are functionalized via Friedel-Crafts reaction with a Lewis acid and a functionalizing agent such as acid anhydrides and / or acylhalides. The clay is exfoliated in one embodiment by the addition of exfoliating agents such as alkyl amines and silanes to the clay. The composition can include secondary rubbers such as general purpose rubbers, and curatives, fillers, and the like. The nanocomposites of the invention have improved air barrier properties such as are useful for tire innerliners and innertubes.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of provisional application 60 / 394,098, filed July 5, 2002, the entire disclosure of which is hereby incorporated by reference. technical field [0003] The present invention relates to nanocomposites comprising clays and elastomers. More specifically, the present invention relates to nanocomposites suitable for inner liners, which nanocomposites are mixtures of clay and functionalized phenyl-containing or styrene-based elastomers, wherein said functionalization can be achieved by Rhett-Crafts reaction to proceed. technical background [0004] Nanocomposites are polymer systems comprising inorganic particles with at least one dimension in the nanometer range. Phenyl-containing elastomers, including, for example, styrene-based elastomers containing therein at least one styrene or substituted styrene unit, are a class of elastomers that can be incorporated into nanocomposites. Some e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C5/02B60C5/14C01B33/44C08K3/04C08K3/34C08K3/36C08L21/00
CPCC08K3/346C08L51/00C08L23/22
Inventor 龚才国A·J·迪亚斯A·H·特索B·J·普勒K·R·卡普
Owner EXXONMOBIL CHEM PAT INC
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