Cellulose esters in highly-filled elastomaric systems

a technology of cellulose ester and elastomeric system, which is applied in the direction of coatings, etc., can solve problems such as difficulty in processing

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

[0006]In one embodiment of the present invention, an elastomeric composition is provided that comprises 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. Further, the cellulose ester is in the form of particles having an average diameter of less than about 10 μm.
[0007]In another embodiment of the present invention, an elastomeric composition is provided comprising at least one primary elastomer, one or more fillers, and at least one non-fibril cellulose ester. 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 125 lbf / in.
[0008]In yet another embodiment of the present invention, a process for producing an elastomeric composition is provided. The process comprises blending at least one cellulose ester, at least one non-nitrile primary elastomer, and at least 70 phr of one or more fillers at a temperature that exceeds the Tg of the cellulose ester to produce an elastomeric composition. The newly-produced elastomeric composition exhibits a Mooney viscosity at 100° C. as measured according to ASTM D1646 of not more than about 110 AU.

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.

Method used

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  • Cellulose esters in highly-filled elastomaric systems

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0132]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 Rubber35353535ULTRASIL 7000Silica65656565GRN234Carbon black15151515Si 266Coupling agent5.085.085.085.08SUNDEX 790Aromatic oil———8.75Stearic acidCure Activator1.51.51.51.5Product of Stage 1MB1210.96210.96210.96219.71STAGE 2Product of Stage 1MB1210.96210.96210.96219.71CAB-551-0.01Cellulose Ester715——Si 69Coupling agent0.5461.17——Zinc oxideCure activator1.91.91.91.9OKERIN WAXMicrocrystalline1.51.51.51.57240waxSANTOFLEXAntioxidant22226PPDP...

example 2

[0136]Various performance properties of the elastomeric compositions produced in Example 1 were tested.

[0137]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.).

[0138]The Mooney Viscosities were measured at 100° C. according to ASTM D 1646.

[0139]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).

[0140]The Dynamic Mechanical Ana...

example 3

[0144]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.

[0145]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

An elastomeric composition is provided comprising at least one primary elastomer, one or more fillers, and at least one non-fibril cellulose ester, wherein 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 125 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. 7th, 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 utilized in various applications, such as in tires, where increased elasticity, hardness, tear resistance, and stiffness are desired. These enhanced properties are generally achieved by adding large amounts of hard fillers (e.g., carbon black, silica, and other minerals) to the elastomeric composition. An additional benefit of highly-filled compositions is that they can be produced on a more economic scale compared t...

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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