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Cellulose esters in pneumatic tires

a technology of cellulose ester and pneumatic tires, which is applied in the direction of coatings, etc., can solve the problems of difficult processing and limited application of many conventional high-filling elastomeric compositions in tires

Inactive Publication Date: 2013-06-13
EASTMAN CHEM CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a tire component made of an elastomeric composition containing at least one non-fibril cellulose ester, at least one non-nitrile primary elastomer, optionally a starch, and at least about 70 parts per hundred rubber (phr) of one or more fillers. The ratio of cellulose ester to starch in the composition is at least about 3:1. The cellulose ester is in the form of particles having an average diameter of less than about 10 μm. The elastomeric composition exhibits a dynamic mechanical analysis (DMA) strain sweep modulus as measured at 5% strain and 30° C. of at least 1,450,000 Pa and a molded groove tear as measured according to ASTM D624 of at least about 120 lbf / in. The process for producing a tire component involves blending the cellulose ester, non-nitrile primary elastomer, and fillers at a temperature that exceeds the Tg of the cellulose ester to produce an elastomeric composition, and then forming a tire component with the elastomeric composition. The use of cellulose esters in elastomers provides improved mechanical properties and reduced rolling resistance.

Problems solved by technology

Unfortunately, the presence of high amounts of fillers in an elastomeric composition greatly increases the processing viscosity of the composition, thus making it very difficult to process.
However, the incorporation of such processing aids into the elastomeric compositions often softens the cured elastomeric compositions, thereby mitigating the benefits of adding high amounts of filler to the composition.
Thus, due to these processing restrictions, many conventional highly-filled elastomeric compositions may have limited application in tires and tire components.

Method used

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  • Cellulose esters in pneumatic tires
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  • Cellulose esters in pneumatic tires

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0134]Elastomeric compositions containing varying amounts of cellulose ester were compared to elastomeric compositions not containing any cellulose ester. The elastomeric compositions were produced according to the formulations and parameters in TABLE 1. Examples 1 and 2 contained varying amounts of cellulose ester, while no cellulose ester was added to Comparative Examples 1 and 2.

TABLE 1ComparativeComparativeIngredientComponentExample 1Example 2Example 1Example 2STAGE 1BUNA VSLS-SBR89.3889.3889.3889.385025-2 HMextended with37.5 phr TDAEBUNA CB 22PBD Rubber35353535ULTRASILSilica656565657000 GRN234Carbon black15151515Si 266Coupling agent5.085.085.085.08SUNDEX 790Aromatic oil———8.75Stearic acidCure Activator1.51.51.51.5Product ofMB1210.96210.96210.96219.71Stage 1STAGE 2Product ofMB1210.96210.96210.96219.71Stage 1CAB-551-0.01Cellulose Ester715——Si 69Coupling agent0.5461.17——Zinc oxideCure activator1.91.91.91.9OKERIN WAXMicrocrystalline1.51.51.51.57240waxSANTOFLEXAntioxidant22226PPDPro...

example 2

[0138]Various performance properties of the elastomeric compositions produced in Example 1 were tested.

[0139]The break stress and break strain were measured as per ASTM D412 using a Die C for specimen preparation. The specimen had a width of 1 inch and a length of 4.5 inches. The speed of testing was 20 inches / min and the gauge length was 63.5 mm (2.5 inch). The samples were conditioned in the lab for 40 hours at 50%+ / −5% humidity and at 72° F. (22° C.).

[0140]The Mooney Viscosities were measured at 100° C. according to ASTM D 1646.

[0141]The Phillips Dispersion Rating was calculated by cutting the samples with a razor blade and subsequently taking pictures at 30× magnification with an Olympus SZ60 Zoom Stereo Microscope interfaced with a PAXCAM ARC digital camera and a Hewlett Packard 4600 color printer. The pictures of the samples were then compared to a Phillips standard dispersion rating chart having standards ranging from 1 (bad) to 10 (excellent).

[0142]The Dynamic Mechanical Ana...

example 3

[0146]In this example, elastomeric compositions were produced using the masterbatch process. A number of different cellulose ester concentrates were prepared and subsequently combined with elastomers to produce the elastomeric compositions.

[0147]In the first stage of the masterbatch process, cellulose esters were bag blended with styrenic block copolymer materials and then fed using a simple volumetric feeder into the chilled feed throat of a Leitstritz twin screw extruder to make cellulose ester concentrates (i.e., masterbatches). The various properties of the cellulose esters and styrenic block copolymer materials utilized in this first stage are depicted in TABLES 4 and 5. All of the recited cellulose esters in TABLE 4 are from Eastman Chemical Company, Kingsport, Tenn. All of the styrenic block copolymers in TABLE 5 are from Kraton Polymers, Houston, Tex. The Leistritz extruder is an 18 mm diameter counter-rotating extruder having an L / D of 38:1. Material was typically extruded ...

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Abstract

A tire component is provided comprising an elastomeric composition containing at least one non-fibril cellulose ester, at least one primary elastomer, and one or more fillers, wherein said composition exhibits a dynamic mechanical analysis (DMA) strain sweep modulus as measured at 5% strain and 30° C. of at least 1,450,000 Pa and a molded groove tear as measured according to ASTM D624 of at least 120 lbf / in.

Description

RELATED APPLICATIONS[0001]This application claims priority to U.S. Provisional Application Ser. Nos. 61 / 567,948; 61 / 567,950; 61 / 567,951; and 61 / 567,953 filed on Dec. 7, 2011, the disclosures of which are incorporated herein by reference to the extent they do not contradict the statements herein.FIELD OF THE INVENTION[0002]The present invention relates generally to elastomeric compositions comprising a cellulose ester and to processes for making such elastomeric compositions.BACKGROUND OF THE INVENTION[0003]Elastomeric compositions comprising high amounts of filler are commonly used to produce tires or various tire components due to their increased elasticity, hardness, tear resistance, and stiffness. These enhanced properties of the elastomeric composition are generally achieved by adding large amounts of fillers (e.g., carbon black, silica, and other minerals) to the composition during production. An additional benefit of highly-filled elastomeric compositions is that they can be p...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08L1/12
CPCC08L1/12C08L1/10C08L1/14C08K13/08C08J3/20C08L21/00
Inventor BASU, SOUMENDRA KUMARHELMER, BRADLEY JAMES
Owner EASTMAN CHEM CO
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