Epoxidized natural rubber compositions, elastomer blends containing an epoxidized natural rubber, and materials containing carbon black and epoxidized natural rubber.

Crumb rubber obtained from recycled tires is subjected to an interlinked substitution process. The process utilizes a reactive component that interferes with sulfur bonds. The resulting treated rubber exhibits properties similar to those of the virgin composite rubber structure prior to being granulated, and is suitable for use in fabricating new tires, engineered rubber articles, and asphalt rubber for use in waterproofing and paving applications.

An object of the present invention is to provide a rubber composition from which a vulcanized rubber having excellent wear resistance and a high breaking elongation and a high breaking stress can be obtained. Further, another object of the present invention is to provide a vulcanized rubber obtained by vulcanizing the rubber composition, and a rubber product and a tire comprising the rubber composition or the vulcanized rubber.

The rubber composition of the present invention includes a rubber component (A), a foaming agent (B), and a polyhydric alcohol (C) having 3 or more hydroxyl groups per molecule, wherein the rubber component (A) comprises 30% by mass or more of natural rubber based on the entire rubber component, and a content of the polyhydric alcohol (C) is 1 to 6 parts by mass per 100 parts by mass of the rubber component (A).

A method for preparing a vulcanizable composition of matter, the method comprising mixing rubber, silica, silica coupling agent, a strong base, and nicotinamide to form a masterbatch, introducing a curative to the masterbatch, and mixing the curative into the masterbatch to form a vulcanizable composition of matter.

The various embodiments of the present invention disclose an peroxide-vulcanised TPVs based on Hevea Brasiliensis natural rubber, polypropylene and solid sulfonic acid doped polyaniline [PAni.DBSA] with useful electrical conductivities (up to about 2.10.2 S/cm] can be produced by using an internal mixer. The peroxide-vulcanised TPVs exhibit useful physical properties and also possess a reasonable good electromagnetic interferences shielding effectiveness. These peroxide-vulcanised TPVs could be recycled up to 4 times without significant loss of their EMI SE, electrical and physical properties. As a result, they have good potential to be used for manufacturing any EMI shielding products, such as EMI shielding seals and gaskets.

A masterbatch manufacturing method is disclosed in which carbon black is added to a liquid and this is agitated to obtain a carbon black slurry; the carbon black slurry and rubber latex are mixed to obtain pre-coagulation rubber latex; and the pre-coagulation rubber latex is coagulated; wherein, at the operation in which the carbon black slurry is obtained, dispersion time from the start of agitation to the end of agitation is not less than 5 times, but not greater than 40 times. A particle diameter reduction relaxation time v may be found by plotting measurement results on a planar graph in such fashion that elapsed time t (minutes) since the start of agitation is plotted on the horizontal axis, and particle diameter f (m) of carbon black is plotted on the vertical axis, to obtain a best-fit solution.

A polylactic acid resin composition of the present invention is constructed by dynamically cross-linking a resin mixture containing a polylactic acid-based resin, trans-polyisoprene, and a cross-linking agent. The resin composition can be used for a wide variety of applications such as automobile molded articles, molded articles for electric products, molded articles for agricultural materials, molded articles for business use, and molded articles for daily use.

A polymer based sealing compound which is foamed, which is applied to vehicle tyres for the reduction in weight and improvement of driving dynamics, a process for producing such foamed sealing compounds, and the use thereof in tyres.

An organometallic compound is incorporated into a vulcanized rubber matrix. A tunable, multi-phase copper sulfide lattice is compounded within an existing sulfur cross-linked morphology, as in crumb rubber obtained from recycled tires or other vulcanized rubber, whereby thermotropic properties of the rubber matrix are modulated. The process involves breaking of sulfur-sulfur and/or sulfur-carbon bonds through action of the carbon sulfide. The resulting rubber is suitable for use in applications typically utilizing virgin rubber, such as new tires, engineered rubber articles, and asphalt rubber for use in waterproofing and paving applications. In other embodiments, an organometallic compound comprising iron acetate or alkaline earth metal acetate is incorporated into the vulcanized rubber matrix.

A rubber composition is disclosed and more particularly, a rubber composition having low uncured viscosity for better green rubber handling and high cured cohesiveness desired cured article properties, methods for making them and articles made from such rubber compositions. Particularly the invention uses 3-hydroxydiphenylamime or 4-hydroxydiphenylamine or their combinations in a rubber composition yielding a rubber composition having a low uncured viscosity for rubber processing and a high cured cohesion and rigidity for the cured rubber product. Such a composition is particularly suitable for rubber applications including tires.