Source: http://www.google.com/patents/US6323273?dq=6004266
Timestamp: 2017-07-27 09:18:11
Document Index: 333311788

Matched Legal Cases: ['Application No. 92145679', 'Application No. 9295517', 'Application No. 92241473', 'Application No. 9133147', 'Application No. 53', 'Application No. 61', 'Application No. 63', 'Application No. 63', 'Application No. 2', 'Application No. 4', 'Application No. 63', 'Application No. 4', 'Application No. 4']

Patent US6323273 - Elastomeric compounds incorporating silicon-treated carbon blacks - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsDisclosed are elastomeric compounds including an elastomer and a silicon-treated carbon black, and optionally including a coupling agent. The elastomeric compound exhibits poorer abrasion resistance in the absence of a coupling agent, lower hysteresis at high temperature and comparable or increased hysteresis...http://www.google.com/patents/US6323273?utm_source=gb-gplus-sharePatent US6323273 - Elastomeric compounds incorporating silicon-treated carbon blacksAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS6323273 B1Publication typeGrantApplication numberUS 09/392,803Publication dateNov 27, 2001Filing dateSep 9, 1999Priority dateMay 22, 1995Fee statusPaidAlso published asUS6448309, US7199176, US20010036995, US20030040553Publication number09392803, 392803, US 6323273 B1, US 6323273B1, US-B1-6323273, US6323273 B1, US6323273B1InventorsKhaled Mahmud, Meng-Jiao Wang, Robert A. Francis, James A. BelmontOriginal AssigneeCabot CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (210), Non-Patent Citations (104), Referenced by (33), Classifications (30), Legal Events (3) External Links: USPTO, USPTO Assignment, EspacenetElastomeric compounds incorporating silicon-treated carbon blacks
US 6323273 B1Abstract
What is claimed is: 1. An elastomeric compound comprising an elastomer and an aggregate comprising a carbon phase and a silicon-containing species phase, wherein said aggregate imparts to the elastomer poorer abrasion resistance, comparable or higher loss tangent at low temperature and a lower loss tangent at high temperature, compared to an untreated carbon black, and wherein said elastomer is: an oil-extended derivative of one or more elastomers selected from styrene-butadiene rubber, natural rubber, polybutadiene, and polyisoprene; or a co-polymer of a conjugated diene and an ethylenic group-containing monomer, wherein said monomer comprises one or more monomer selected from styrene, methylstyrene, chlorostyrene, acrylonitrile, 2-vinyl-pyridine, 5-methyl 2-vinyl pyridine, 5-ethyl-2-vinyl-pyridine, 2-methyl-5-vinyl pyridine, alkyl-substituted acrylates, vinyl ketone, methyl isopropenyl ketone, methyl vinyl ether, alphamethylene carboxylic acids and the esters and amides thereof.
ethylene propylene diene monomer (EPDM), wherein said aggregate is present in an amount of from 50 to 250 parts per 100 parts by weight of said elastomer; poly(chloroprene), wherein said aggregate is present in an amount of from 10 to 150 parts per 100 parts by weight of said elastomer; natural rubber, wherein said aggregate is present in an amount of from 10 to 150 parts per 100 parts by weight of said elastomer; hydrogenated nitrile butadiene rubber, wherein said aggregate is present in an amount of from 10 to 150 parts per 100 parts by weight of said elastomer; styrene butadiene rubber, wherein said aggregate is present in an amount of from 10 to 150 parts per 100 parts by weight of said elastomer; and ethylene vinyl acetate, wherein said aggregate is present in an amount of from 10 to 150 parts per 100 parts by weight of said elastomer. 8. The elastomeric composition of claim 7, wherein said elastomer is ethylene propylene diene monomer and said aggregate is present in an amount of from 100 to 200 parts per 100 parts by weight of said elastomer.
α=(150° C.−80° C.)/(t 150 −t 80)[°C./s] where t150 and t80 are the times needed for samples to reach 150° C. and 80° C. respectively. α is the heating rate between temperatures 80° and 150° C.
The external surface area (t-area) was measured following the sample preparation and measurement procedure described in ASTM D3037—Method A for Nitrogen surface area For this measurement, the nitrogen adsorption isotherm was extended up to 0.55 relative pressure. The relative pressure is the pressure (P) divided by the saturation pressure (P0) (the pressure at which the nitrogen condenses). The adsorption layer thickness (t1) was then calculated using the relation: t 1 = 13.99 0.034 - log   ( P / P 0 ) ] The volume (V) of nitrogen adsorbed was then plotted against t1. A straight line was then fitted through the data points for t, values between 3.9 and 6.2 Angstroms. The t-area was then obtained from the slope of this line as follows:
N234 + 3.7% silica
Treatrnent
a Duradene 715; two stage mixing. As seen in Table 6 above, tan δ at 70° C. values were reduced by 7%, tan δ at 0° C. values reduced by 2.3% and the wear resistance was reduced by 15%, for the SSBR samples when OMTS-CB was substituted for N234. However, when the Si-69 coupling agent was incorporated into the composition, the wear resistance for the OMTS-CB sample improved to 110% of the value for N234. The tan δ at 70° C. values decreased by 19.6% compared to N234 without coupling agent and 10.5% compared to N234 with coupling agent. The tan δ at 0° C. values increased by 11% when the coupling agent was added to the OMTS-CB, compared to OMTS-CB without coupling agent. Similarly, for TEOS-CB, the tan δ at 70° C. value is reduced by 11.6%, the tan δ at 0° C. value is unchanged and the wear is reduced by 21.9%. When compounded with the coupling agent, the tan δ at 70° C. value is reduced by 24.9%, the tan δ at 0° C. value is increased by 8.3% and the wear decreased by only 2.8%.
tan δ @ 70° C.
I#OS-CB
IEOS-CB
a Cariflex S-1215; two stage mixing Example 7
NR (5MR5)
tan δ@
L Precipitated Silica
a K+ injected as a Potassium Acetate solution. The resultant carbon blacks were analyzed for surface area, structure, and silicon content. These values are set forth in Table 17 below.
tanδ @
Hurnko Chemical Co., TN
R. B. Carroll, NJ
R. T. Vanderbilt, CT
Rhein-Chernie Corp., NJ
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