Abstract: An insulation composition that comprises at least one nitrile butadiene rubber (“NBR”) having an acrylonitrile content that ranges from approximately 26% by weight to approximately 35% by weight and polybenzoxazole (“PBO”) fibers. The NBR may be a copolymer of acrylonitrile and butadiene and may be present in the insulation composition in a range of from approximately 45% by weight to approximately 56% by weight of a total weight of the insulation composition. The PBO fibers may be present in a range of from approximately 3% by weight to approximately 10% by weight of a total weight of the insulation composition. A rocket motor including the insulation composition and a method of insulating a rocket motor are also disclosed.

Abstract: This invention relates to novel copolymers preferably for intraocular lenses (“IOL”), contact lens, and other ophthalmic and optical applications. This invention, in one aspect, relates to copolymer compositions comprising limited amounts of a monomer having a naphthyl moiety or naphthyl functionalities, naphthalene, or a naphthyl group.

Abstract: This invention relates to ion conducting random copolymers that are useful in forming polymer electrolyte membranes used in fuel cells.

Abstract: A process is described for functionalizing isobutene polymers having terminal olefinic unsaturation by treating with the reaction product of a borane source with from 0.5 to 1.8 equivalents of an alkene having a molecular weight of less than 250 per mole of borane or by treating the isobutene polymer with the borane source in the presence of the alkene. The reaction mixtures retain low viscosity and good stirrability.

Abstract: The invention concerns hydrous compositions based on polychloroprene and hydroxylamine derivatives, processes for their production and their use as adhesives. The polychloroprene dispersions are stabilized by the addition of hydroxyalkylamine after removal of residual monomer.

Abstract: The present invention discloses a polyethylene catalyst and a process for preparing the same, said catalyst being composed of a main component of catalyst and a cocatalyst, wherein the main component of catalyst is prepared by reacting: (1) a magnesium-alcohol complex, (2) an alkyl aluminum compound having a formula R3nAlCl3-n supported on silica, and (3) a titanium compound having a formula Ti(OR2)mCl4-m, and the cocatalyst is an organic aluminum compound. The catalyst of the present invention has advantages including high polymerization activity, less difference between the polymerization activities at low hydrogen level condition and at high hydrogen level condition, stable polymerization reaction, good particle morphology of catalyst, and less fine powder of polymer product.

Abstract: Uniform chlorinated polyolefins which can give crosslinked rubbers and thermoplastic elastomers with excellent low-temperature rubber elasticity, compression set and fatigue strength, and a process for their production. Polyolefin powder pulverized to a mean particle size of no greater than 500? is used for chlorination.

Abstract: A rubber composition and a tire made therefrom in which rolling resistance can be reduced without lowering wet grip performance, wherein the rubber composition contains a rubber component and 15 to 150 parts by weight of silica having a nitrogen adsorbing-specific surface area of 20 to 500 m2/g, on the basis of 100 parts by weight of the rubber component, and wherein the rubber component includes not less than 15% by weight of a styrene-butadiene rubber (1) containing a styrene amount of not less than 33% by weight and a vinyl amount of not less than 30% by weight, and not less than 10% by weight of a styrene-butadiene rubber (2) containing a styrene amount of not more than 15% by weight and a vinyl amount of not more than 60% by weight, wherein a total amount of the styrene-butadiene rubber (1) and the styrene-butadiene rubber (2) is not less than 60% by weight.

Abstract: The present invention provides a catalyst component for polymerization of olefin CH2?CHR, in which R is hydrogen or C1-C12 alkyl or aryl, comprising magnesium, titanium, a halogen and an electron donor compound (a) which is at least one selected from the group consisting of dibasic ester compounds of the formula (I), and said catalyst component optionally further comprising an electron donor compound (b) selected from the group consisting of aliphatic dicarboxylic esters and aromatic dicarboxylic esters, and/or an electron donor compound (c) selected from the group consisting of 1,3-diether compounds of formula (IV): wherein, R1, R? and A are as defined in the description, wherein RI-RVIII are as defined in the description, and a catalyst comprising the catalyst component.

Abstract: The present invention relates to a modified crumb rubber particle having carbon to silicon bonds created by the reaction of the unsaturation in the crumb rubber particle and silicon hydride, with or without the use of a catalyst. Bound silicon content ranges from about 0.1% to 10% by weight. The silicon-modified crumb rubber can be used as is or a reinforcing filler in formulations. Typically the silicon-modified crumb rubber is used in up to 25% by weight of the total rubber present in virgin rubber compositions.

Abstract: Polyvinyl acetals are obtained in a cost-effective and environmentally advantageous manner by employing as at least a portion of the aqueous acetalization medium, the mother liquor from a previous acetalization reaction.

Abstract: An adhesive composition includes a polymer adhesive material and a thickener. The adhesive composition has a stringing length of 9 cm or less and a phase lag of 45 degrees or less or a sag distance of 5 mm or less. The adhesive can be formed by combining a vinyl acetate polymer, an alkali swellable thickener, an alkali material, and water.

Abstract: A Ziegler-Natta catalyst composition comprising a solid mixture formed by halogenation of: Al) a spray-dried catalyst precursor comprising the reaction product of a magnesium compound, a non-metallocene titanium compound, and at least one non-metallocene compound of a transition metal other than titanium, with A2) an organoaluminium halide halogenating agent, a method of preparing, precursors for use therein, and olefin polymerization processes using the same.

Abstract: The present invention relates to a peroxide curable rubber compound comprising at least one elastomeric polymer comprising repeating units derived from at least one C4 to C7 isomonoolefin monomer, at least one C4 to C14 multiolefin monomer and at least one m- or p-alkylstyrene monomer.

Abstract: A process is provided for the hydrogenation of carbon-carbon double bonds in polymers by treatment of the polymers with hydrogen in the presence of rhodium-based catalysts and in the complete absence of organic solvent.

Abstract: A catalyst for the polymerisation of 1-olefins is disclosed, which comprises (1) a compound of Formula B wherein M is Fe[II], Fe[III], Co[I], Co[II], Co[III], Mn[I], Mn[II], Mn[III], Mn[IV], Ru[II], Ru[III] or Ru[IV]; X represents an atom or group covalently or ionically bonded to the transition metal M; T is the oxidation state of the transition metal M and b is the valency of the atom or group X; R1, R2, R3, R4, R5, R6 and R7 are independently selected from hydrogen, halogen, hydrocarbyl, substituted hydrocarbyl, heterohydrocarbyl or substituted heterohydrocarbyl; and when any two or more of R1-R7 are hydrocarbyl, substituted hydrocarbyl, heterohydrocarbyl or substituted heterohydrocarbyl, said two or more can be linked to form one or more cyclic substituents; and (2) a further catalyst. Copolymers made using the catalyst having specific physical properties are also disclosed.

Abstract: The present invention provides peroxidically crosslinked hydrogenated vinylpolybutadienes which serve for production of technical rubber products and which have very good recovery performance over a wide temperature range.

Abstract: The present invention provides a method for varying the melting points and molecular weights of polyolefins by changing the structure of the catalyst used in the polymerization. The catalysts that are useful in the present invention are chiral, stereorigid metallocene catalyst of the formula R?(C5R?m)2MeQ. The catalysts include a bridge structure between the (C5R?m) groups and may contain substituents on the groups. It has been discovered that the melting points and molecular weights of the polymers produced by such catalysts are influenced by the bridge and substituents added to the (C5R?m) groups. Thus, the present invention provides a method for varying the melting points of the polymer product and a method of varying the molecular weights of the product by changing the components and structure of the metallocene catalysts. The present invention also provides a process for polymerizing olefins in which the melting points and/or molecular weights of the product may be controlled.

Abstract: Crystalline polymers and copolymers of propylene having total MIL values>2 g/10 minutes, total [?] values in tetrahydronaphthalene at 135° C.?2.8 dl/g, mW/MN values>20, a fraction insoluble in xylene at 25° C.?94, and including from 10 to 60% by weight of a fraction (A) having [?]?2.6, are prepared by way of sequential polymerization in at least two stages, in the presence of a particular Ziegler-Natta catalysts supported on magnesium halides. These polymers have high melt strength, high mechanical properties, and are particularly adequate for the manufacture of articles by using various conversion technologies, such as for example extrusion in thin sheets to be subjected to thermoforming, as well as for injection molding, and blow molding.

Abstract: A process for preparing polyisocyanate-modified polycarboxylic acids by conversion of anhydride-group-free polycarboxylic acids with isocyanate-functional compounds. The process includes reacting A) an anhydride-group-free polycarboxylic-acid component with B) an isocyanate-functional component having an (average) isocyanate functionality of at least 1.8, at an equivalent ratio of carboxylic acid groups to isocyanate groups of from 1.2:1 to 120:1. The polyisocyanate-modified polycarboxylic acids are solid below 40° C. and liquid above 130° C., and have an average carboxylic acid functionality of at least 1.8, a content of free carboxylic acid groups of from 4.0 wt. % to 80.0 wt. % and a content of amide groups of from 0.4 wt. % to 32.5 wt. %.