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AssigneeCabot Corporation
InventorsMelinda Ann Mabry, Ting Wang, Ivan Zlatko Podobnik, James A. Shell, Allan Clark Morgan, Bin Chung, Noboru Tokita
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Elastomer composite blends are produced by novel wet/dry mixing methods and apparatus. In the wet mixing step or stage, fluid streams of particulate filler and elastomer latex are fed to the mixing zone of a coagulum reactor to form a mixture in semi-confined flow continuously from the mixing zone through a coagulum zone to a discharge end of the reactor. The particulate filler fluid is fed under high pressure to the mixing zone, such as to form a jet stream to entrain elastomer latex fluid sufficiently energetically to substantially completely coagulate the elastomer with the particulate filler prior to the discharge end. Highly efficient and effective elastomer coagulation is achieved without the need for a coagulation step involving exposure to acid or salt solution or the like. Novel elastomer composites are produced. Such novel elastomer composites may be cured or uncured, and combine material properties, such as choice of filler, elastomer, level of filler loading, and macro-dispersion, not previously achieved. The coagulum produced by such wet mixing step, with or without intermediate processing steps, is then mixed with additional elastomer in a dry mixing step or stage to form elastomer composite blends. The additional elastomer to the coagulum may be the same as or different from the elastomer(s) used in the wet mixing step.
A method of producing elastomer composite blend, comprising:
A method of producing elastomer composite blend, comprising:
A method of producing elastomer composite blend, comprising:
Elastomer composite blend comprising particulate filler finely dispersed in elastomer, formed by a method comprising the steps of:
Elastomer composite blend formed by:
An elastomer composite blend comprising at least 30 phr particulate filler dispersed in a multi-phase elastomer, the particulate filler being selected from carbon black, silicon coated carbon black, silicon treated carbon black, fumed silica, precipitated silica or a mixture of any of them, and each phase of the multiphase elastomer being independently selected from natural rubber, a chlorinated derivative of natural rubber, homopolymer, copolymer or terpolymer of butadiene, styrene, isoprene, isobutylene, 3,3-dialkyl-1,3-butadiene where the alkyl group is C1 to C3 alkyl, acrylonitrile, ethylene and propylene, an oil extended derivative of any of them and a mixture of any of them wherein macro-dispersion D(%) of the particulate filler in the elastomer composite blend is less than 0.2% undispersed area.
Dependencies are inferred from the claim text.