W. R. Grace Co.-conn.

Timothy A Boyer

Xinggao Fang

James George Miller

Donald R Durham

Michael J Wax

Michael J Elder

John Henry Hain, Jr

Ronald A Epstein

Robert Haywood Bates, Deceased

Courtney S Spain

Michael S Miller

A phthalate-free procatalyst composition is disclosed for olefin polymerization that exhibits excellent polymerization activity and response to hydrogen, and can produce a polyolefin exhibiting high stereoregularity, high melt flow rate, and desirable molecular weight distribution. The method for producing the procatalyst composition includes reaction of a magnesium support precursor with a tetravalent titanium halide and a combination of different internal electron donors. The first internal electron donor may comprise one or more substituted phenylene aromatic diester and the second internal electron donor may comprise a polyether, preferably a 1,3-diether. In one embodiment, the support precursor comprises a spherical spray crystalized MgCl-EtOH adduct.

Procatalyst composition made with a combination of internal electron donors

Processes for preparing aluminoxane comprising: bringing into contact under reaction conditions in an inert atmosphere a liquid containing reaction mixture comprising: (i) a water in oil emulsion comprising water and at least one emulsifier in a first hydrocarbon solvent; and (ii) an organoaluminum compound capable of forming aluminoxane in a second hydrocarbon solvent; provided that the aluminoxane produced by the reaction is present in solution under the reaction conditions. In a preferred embodiment a support carrier for the aluminoxane: (i) is present during the contact step or (ii) is introduced following contact. A polymerization catalyst can be prepared wherein the support carrier is SiO2 and a Group 3 to Group 10 metal containing single site complex is mixed with the aluminoxane. Catalysts suitable for polymerizing an olefin such as ethylene or copolymerizing an olefin with at least one Cto Calpha-olefin can be produced.

Process of making aluminoxane and catalysts containing thus prepared aluminoxane

A porous inorganic oxide carrier body for immobilizing living cells is prepared from inorganic oxide particles such as clay particles. The particles have an average particle size of from 0.01 to 20 microns, and the carrier body has a total pore volume of 0.05 to 1.0 cc/g and an average pore diameter of 50 to 700 .ANG., and has substantially no pore volume in the range of 800 .ANG. or greater. The carrier is prepared by forming a mixture containing the particles, a liquid medium and optional ingredients including zeolite and activated carbon, and forming the mixture into a shaped carrier body which may be optionally dried and calcined. Typical shapes of the carrier include spheres, cylinders, rings, honeycombs and shaped monoliths. Bacteria and other microorganisms immobilized on the carrier are useful for treatment of contaminated waste streams or contaminated vapors, or for other uses for which microorganisms are used such as the synthesis of chemicals.

Porous, non-macroporous, inorganic oxide carrier body for immobilizing

The accumulation of gaseous ammonia in areas wherein animals are housed or maintained is controlled by providing to the areas animal litter, bedding, or other absorbent material which contain a low molecular weight, non-volatile organic acid. Acids such as citric, malic, fumaric, phosphoric, tartaric, maleic, malonic, succinic, sorbic and mixtures of these acids are used and especially phosphoric and fumaric. These acids can be used in concentrations of about 0.0001 to 2 wt % of the dry bedding.

Suppression of ammonia odors from animal wastes

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Eldersburg, MD, United States of America

Timothy A Boyer