Efficient mixing process for producing thermoplastic elastomer composition

A technology of thermoplastic elastomers and elastomers, which is applied in the field of thermoplastic elastomer compositions, and can solve problems such as insufficient durability and reduction

Inactive Publication Date: 2010-09-01
EXXONMOBIL CHEM PAT INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is reported in EP 969039A1 that the durability at low temperature is insufficient by merely reducing the rubber particle size

Method used

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  • Efficient mixing process for producing thermoplastic elastomer composition
  • Efficient mixing process for producing thermoplastic elastomer composition
  • Efficient mixing process for producing thermoplastic elastomer composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0138] The following commercially available products were used as components used in the examples.

[0139] 1. Resin components

[0140] N11 (Nylon 11): Rilsan BMN O TL (Atochem)

[0141] N6 / 66 (nylon 6 / 66 copolymer): Ube 5033B (Ube)

[0142] P: plasticizer, BBSA, N-butylsulfonamide

[0143] S: Stabilizer package, which includes Irganox, Tinuvin and CuI

[0144] 2. Rubber components

[0145] BIMS-I: Exxpro 89-4 (ExxonMobil Chemical)

[0146] ZnO: zinc oxide curing agent

[0147] St-acid: stearic acid curing agent

[0148] ZnSt: zinc stearate curing agent

[0149] AR201: Maleated ethylene ethyl acrylate (EEA) copolymer (Mitsui-DuPont)

[0150] Exxelor VA 1840: maleated (0.2-0.5 wt%) ethylene-octene copolymer (ExxonMobil Chemical)

[0151] To study the grafting efficiency of elastomers to nylon, blends of elastomers with N6 / 66 were prepared using a Brabender internal mixer at 220 °C and 60 RPM for 3 minutes. 60 parts of nylon was first added for 2 minutes before adding 4...

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Abstract

A durable, flexible, impermeable thermoplastic elastomer composition is produced using a dynamic vulcanization process conducted in a high shear mixer at elevated temperature. The composition comprises cured particles of a first halogenated isobutylene-containing elastomer and particles of a second elastomer having at least one functional group capable of reacting with and grafting to a polyamide, the particles of the first and second elastomers dispersed in a continuous thermoplastic polyamide matrix, the process comprising: (1) dispersing a curative in the halogenated elastomer and forming a pre-compounded, preferably pelletized composition; (2) introducing polyamide resin and optional stabilizers into the mixer and shearing and heating to melt the polyamide and form a mixture; (3) introducing a nylon plasticizer to reduce the viscosity of the polyamide mixture to substantially match that of the pre-compounded elastomer under mixing conditions; (4) introducing pellets of the pre-compounded elastomer into the mixer and initiating dynamic vulcanization of the elastomer and polyamide components; (5) introducing the second elastomer and continuing heating and shearing to disperse the second elastomer and substantially complete dynamic vulcanization; and delivering the thermoplastic elastomer composition from the mixer. Such compositions are particularly useful in applications such as tire inner liners and barrier films or layers.

Description

technical field [0001] The present invention relates to thermoplastic elastomer compositions particularly useful in tire and other industrial rubber applications, and more particularly to methods of producing such compositions. Background technique [0002] EP 722850 B1 discloses a low-permeability thermoplastic elastomer composition which is excellent for use as a gas barrier layer in a pneumatic tire. The thermoplastic elastomer composition comprises a low transmission thermoplastic matrix such as a polyamide or polyamide blend dispersed therein a low transmission rubber such as brominated poly(isobutylene-co-p-methylstyrene) , typically called BIMS. In EP 857761A1 and EP 969039A1, both as a function of the volume fraction ratio and independently, the viscosity ratio of the thermoplastic matrix to the dispersed rubber phase is specified to be close to value. EP969039A1 further discloses that a small particle size rubber dispersed within a thermoplastic resin matrix is ​...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/00B29C47/40C08G81/02C08L27/10C08L23/28B29C48/405
CPCC08L23/28B29C47/0011B29C47/40C08L23/283C08J2377/00C08J3/005C08L15/00C08L77/00B29C48/04B29C48/405B29B7/7495B29B7/90B29B7/48B29B7/007B29B7/726B29B7/82C08L2666/02C08L2666/06
Inventor A·H·周原祐一M·K·里昂添田善弘
Owner EXXONMOBIL CHEM PAT INC
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