Cabot Corporation

Ting Wang

Meng-Jiao Wang

Xuan Zhang

Glendon A McConnell

Michael D Morris

Allan Clark Morgan

Bin Chung

Ivan Zlatko Podobnik

Melinda Ann Mabry

Noboru Tokita

James A Shell

Martin C Green

Steven R Reznek

Vijay R Tirumala

Boon Kwang Lee

Anthony Das Thiruhelvanthan

Thirunavuc Karasu Govindan

Bernard Mariadass

Anthony Das Thiruhelvanathan

A wet mix elastomer composite comprising carbon black dispersed in an elastomer including a blend of a natural rubber and styrene-butadiene rubber. When the wet mix elastomer composite is processed with CTV Method 1, the vulcanized wet mix elastomer composite exhibits a resistivity that A) has a natural logarithm satisfying the equation ln(resistivity)&#x2265;&#x2212;0.1(loading)+x, where x is 14, or B) is at least 2.9 times greater than the resistivity of a vulcanized dry mix elastomer composite having the same composition and prepared using Comparative CTV Method 1.

Elastomer composite blends, method and apparatus for producing same

A method of producing an elastomer composite. The method includes A) combining a first fluid comprising elastomer latex with a second fluid comprising particulate filler; B) causing the elastomer latex to coagulate, thereby forming masterbatch crumb; C) bringing the masterbatch crumb to a water content of about 1 weight percent to about 20 weight percent, thereby forming a de-watered coagulum; D) removing water from the de-watered coagulum by subjecting the dewatered coagulum to mechanical energy, thereby causing the dewatered coagulum to heat as a result of friction, while allowing the dewatered coagulum to achieve a temperature of about 130&#xb0; C. to about 190&#xb0; C., wherein water content is reduced to about 0.5% to about 3% and wherein substantially all of the decrease in water content is accomplished by evaporation, thereby producing a masticated masterbatch; and E) subjecting the masticated masterbatch to at least an additional 0.3 MJ/kg of mechanical energy while further reducing the water content.

Elastomer composite and method for producing it

A method of producing a coagulated latex composite. A coagulating mixture of a first elastomer latex and a particulate filler slurry is flowed along a conduit, and a second elastomer latex is introduced into the flow of the coagulating mixture.

Formation of latex coagulum composite

A method of producing an elastomer composite. The method includes A) combining a first fluid comprising elastomer latex with a second fluid comprising particulate filler; B) causing the elastomer latex to coagulate, thereby forming masterbatch crumb; C) bringing the masterbatch crumb to a water content of about 1 weight percent to about 20 weight percent, thereby forming a dewatered coagulum; D) removing water from the dewatered coagulum by subjecting the dewatered coagulum to mechanical energy, thereby causing the dewatered coagulum to heat as a result of friction, while allowing the dewatered coagulum to achieve a temperature of about 130&#xb0; C. to about 190&#xb0; C., wherein water content is reduced to about 0.5% to about 3% and wherein substantially all of the decrease in water content is accomplished by evaporation, thereby producing a masticated masterbatch; and E) subjecting the masticated masterbatch to at least an additional 0.3 MJ/kg of mechanical energy while further reducing the water content.

A bale of elastomer composite is formed of elastomer and filler, the bale having a void volume of at least 3%. In another aspect, a container is provided, at least a portion of the container being occupied by elastomer composite pieces of elastomer and filler, wherein the occupied portion of the container has a void volume of at least 3%.

Elastomer composite materials in low density forms and methods

Elastomer composites and elastomer blends comprising particulate fillers having selected structure and surface area values are disclosed as well as elastomer composites and elastomer blends having improved properties. Methods of making and using elastomer composites and elastomer blends are also disclosed.

Elastomer composites, elastomer blends and methods

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.

Growing community of inventors

Billerica, MA, United States of America

Ting Wang