Disclosed are polyethylene, chlorinated polyethylene thereof and a molded article produced from the chlorinated polyethylene. More specifically, disclosed are polyethylene for preparation of chlorinated polyethylene, the polyethylene having a molecular weight distribution (MWD) of 5 or less, a melting index (5.0 kg) of 0.1 to 10 dg/min, a weight average molecular weight of 50,000 to 300,000 g/mol, a melting temperature of 125 to 135° C., a wax content of 0.0001 to 3% by weight or 0.01 to 0.3% by weight and a density of 0.94 g/cm.sup.3 or more, chlorinated polyethylene thereof and a molded article produced from the chlorinated polyethylene.

An antioxidant combined with UHMWPE prior to subjecting the UHMWPE to crosslinking irradiation. In one exemplary embodiment, the antioxidant is tocopherol. After the antioxidant is combined with the UHMWPE, the resulting blend may be formed into slabs, bar stock, and/or incorporated into a substrate, such as a metal, for example. The resulting product may then be subjected to crosslinking irradiation. In one exemplary embodiment, the UHMWPE blend is preheated prior to subjecting the same to crosslinking irradiation. Once irradiated, the UHMWPE blended product may be machined, packaged, and sterilized in accordance with conventional techniques.

The present invention relates to a method for crosslinking hyaluronic acid, a method for preparing an injectable hydrogel, the hydrogel thus obtained and its use.

The present invention relates to a composition comprising a polymeric network having at least one unit of formula (I), (II), and/or (III); (I) (II) (III) wherein said composition is obtained by contacting at least one compound A comprising at least two functions selected from the group of function of formula X—C(═O)—CHR.sup.1—C(═O)—R.sup.2, —C(═O)—C—R.sup.2; or —C(═O)—CR.sup.1═CR.sup.2—NR.sup.4R.sup.5; wherein at least 25% by weight of compounds A have a functionality ≦5, with % by weight relative to the total weight of compounds A; with at least one compound B comprising at least one NH.sub.2, or NH.sub.3.sup.+ groups; wherein X, R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, L.sup.1 and L.sup.2 have the same meaning as that defined in the claims. The present invention also relates to a compound comprising at least two units and at most 5 units of formula (I), (II), and/or (III); wherein R.sup.1, R.sup.2, R.sup.3, X, L.sup.1 and L.sup.2 have the same meaning as that defined in the claims. The present invention also relates to processes for preparing said composition and said compounds, to material, articles, and polymers comprising or using said compositions and compounds, and the use thereof.

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An object of the present invention is to provide a novel sulfur-based positive electrode active material for a lithium-ion secondary battery which is excellent in cyclability and can largely improve a charging and discharging capacity, a positive electrode comprising the positive electrode active material and a lithium-ion secondary battery made using the positive electrode. The sulfur-based positive electrode active material is obtainable by subjecting a starting material comprising a polymer, sulfur and an organometallic compound dispersed in a form of fine particles to heat-treatment under a non-oxidizing atmosphere, wherein the particles of metallic sulfide resulting from sulfurization of the organometallic compound are dispersed in the heat-treated material, and particle size of the metallic sulfide particles is not less than 10 nm and less than 100 nm.

An internal combustion engine ignition coil according to the present invention includes: a central iron core; a primary coil disposed on an outer circumference of the central iron core; a secondary coil disposed on an outer circumference of the primary coil; a side iron core disposed on an outer circumference of the secondary coil; and an insulating material sealing the central iron core, the primary coil, and the secondary coil on an inner side of the side iron core. A first layered silicate having a particle diameter less than a winding diameter of the secondary coil is present at a higher concentration in a vicinity of the secondary coil than that in a vicinity of the side iron core in the insulating material. A second layered silicate having a particle diameter greater than the winding diameter of the secondary coil is present at a higher concentration than that of the first layered silicate between the outer circumference side of the secondary coil and the side iron core. The second layered silicate has an aspect ratio of 50 or more, the aspect ratio being a ratio of a long side of a particle of the layered silicate to a thickness of the particle.

The present invention relates to methods for making wear and oxidation resistant polymeric materials by high temperature melting. The invention also provides methods of making medical implants containing cross-linked antioxidant-containing tough and ductile polymers and materials used therewith also are provided.

A cured elastomer golf ball component is made by heating an elastomer compound containing an ethylenically unsaturated elastomer, an ethylenically unsaturated monomer, and first and second free radical initiators to a first crosslinking temperature T.sub.1 in a compression mold and partially crosslinking the elastomer, then heating to a second crosslinking temperature T.sub.2 and curing the elastomer component of the golf ball. Either: (i) the first initiator has a half-life of about 0.2-5 minutes at T.sub.1, the second initiator has a half-life of about 0.2-5 minutes at T.sub.2, and T.sub.2 is higher T.sub.1 by at least about 30° C.; or (ii) the second initiator's one-minute half-life temperature is at least about 30° C. higher than the first initiator's one-minute half-life temperature, T.sub.1 is within about 20° C. of the first initiator's one-minute half-life temperature, and T.sub.2 is within about 20° C. of the second initiator's one-minute half-life temperature.

An organic peroxide formulation comprises at least one organic peroxide, at least one drying oil, and at least one free radical trap. A process comprises curing mixtures that include at least one elastomer and the organic peroxide formulation in the presence of oxygen. Elastomer compositions, methods of manufacturing elastomer articles, and elastomer articles made from the elastomer compositions are also disclosed.

An electro-conductive hydrogel composite material that may be suitable as an artificial skin satisfies all four requirements of artificial skin, namely, flexibility, electrical conductivity, healing property, and biocompatibility. The electro-conductive hydrogel composite material includes a hydrogel composition including water and a cross-linkable polymer which reversibly forms cross-linkage by hydrogen bonding; and an electro-conductive material dispersed in the hydrogen bond-based hydrogel.