Dow, Mitsui Team Up On Metallocene R&D.A joint R&D program to develop high-performance metallocene polyolefin catalysts has been formed by Dow Plastics, Midland, Mich., and Japan's Mitsui Chemicals, Inc. These catalysts will be designed to allow for the incorporation of polar comonomers such as methyl methacrylate methyl methacrylate (meth´il methak´rilāt), n an acrylic resin, CH2 = C(CH3)COOCH3, derived from methyl acrylic acid. Monomer is the single molecule and polymer is the polymerization product. and vinyl acetate Vinyl acetate, also known as VAM for vinyl acetate monomer, has the chemical formula CH3COOCH=CH2 and is a colorless liquid with a sweet flavor. Systematic names include 1-acetoxyethylene and acetic acid ethenyl ester. . Their use has been limited so far because they tend to "kill" conventional Ziegler-Natta and metallocene catalysts. Polar comonomers could enhance properties like adhesion, gas barrier, and oil resistance. In addition, the two firms have a cross-licensing agreement covering their patents on metallocene-catalyzed ethylene copolymers. Mitsui may now use Dow's Insite technology to make ethylene copolymers. Japan Chemical Week reports that Mitsui Chemicals has developed a non-metallocene catalyst that can copolymerize co·pol·y·mer·ize v. co·pol·y·mer·ized, co·pol·y·mer·iz·ing, co·pol·y·mer·iz·es v.tr. To polymerize (different monomers) together. v.intr. To react to form a copolymer. ethylene with polar monomers like MMA (Microcomputer Managers Association, Inc.) A membership organization with chapters throughout the U.S. that was devoted to educating personnel responsible for personal computers. It disbanded in 1996. Mma - A fast Mathematica-like system, in Allegro CL by R. Fateman, 1991. and acrylonitrile acrylonitrile /ac·ry·lo·ni·trile/ (ak?ri-lo-ni´tril) a colorless halogenated hydrocarbon used in the making of plastics and as a pesticide; its vapors are irritant to the respiratory tract and eyes, may cause systemic poisoning, and are . This phenoxyimine complex reportedly has 10 times higher ethylene-polymerization activity than current metallocenes and produces resins with low to ultra-high molecular weight. |
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