The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 13, 2009
Filed:
Nov. 18, 2005
Yasushi Nakayama, Ichihara, JP;
Naoto Matsukawa, Ichihara, JP;
Junji Saito, Chiba, JP;
Hideki Bando, Ichihara, JP;
Yoshiho Sonobe, Yokohama, JP;
Kenji Michiue, Ichihara, JP;
Makoto Mitani, Yokohama, JP;
Terunori Fujita, Yokohama, JP;
Yasushi Nakayama, Ichihara, JP;
Naoto Matsukawa, Ichihara, JP;
Junji Saito, Chiba, JP;
Hideki Bando, Ichihara, JP;
Yoshiho Sonobe, Yokohama, JP;
Kenji Michiue, Ichihara, JP;
Makoto Mitani, Yokohama, JP;
Terunori Fujita, Yokohama, JP;
Mitsui Chemicals, Inc., Minato-Ku, Tokyo, JP;
Abstract
Ethylene-based copolymer microparticles and functional group-containing ethylene-based copolymer microparticles that have particle diameter smaller than that of conventional polyethylene fine-particles, no inter-particle agglomeration, very narrow particle size distribution, and high sphericity are provided, in which requirements (A) to (E): (A) The intrinsic viscosity [η] measured in decalin at 135° C. is in the range of 0.1 to 50 dl/g, (B) at least 95 wt % or more of particles pass through a mesh screen with an opening of 37 μm, (C) the median diameter (d) measured by laser diffraction scattering is 3 μm≦d≦25 μm, (D) the circularity coefficient is 0.85 or more, and (E) the variation coefficient of particle diameter (Cv) is 20% or less. Non-agglomerated spherical magnesium-containing microparticles used as magnesium-containing carrier component for olefin-polymerization catalysts that can manufacture the above microparticles are also provided.