	US 7,601,423 B2
	Ethylene-based polymer microparticles, functional group-containing ethylene-based polymer microparticles, and catalyst carriers for manufacture thereof
Yasushi Nakayama, Ichihara (Japan); Naoto Matsukawa, Ichihara (Japan); Junji Saito, Chiba (Japan); Hideki Bando, Ichihara (Japan); Yoshiho Sonobe, Yokohama (Japan); Kenji Michiue, Ichihara (Japan); Makoto Mitani, Yokohama (Japan); and Terunori Fujita, Yokohama (Japan)
Assigned to Mitsui Chemicals, Inc., Minato-Ku, Tokyo (Japan)
Appl. No. 11/791,104 PCT Filed Nov. 18, 2005, PCT No. PCT/JP2005/021245 § 371(c)(1), (2), (4) Date May 18, 2007, PCT Pub. No. WO2006/054696, PCT Pub. Date May 26, 2006.
Claims priority of application No. 2004-336325 (JP), filed on Nov. 19, 2004; application No. 2004-336326 (JP), filed on Nov. 19, 2004; application No. 2005-021600 (JP), filed on Jan. 28, 2005; application No. 2005-021601 (JP), filed on Jan. 28, 2005; application No. 2005-021604 (JP), filed on Jan. 28, 2005; and application No. 2005-032222 (JP), filed on Feb. 08, 2005.
Prior Publication US 2008/0044655 A1, Feb. 21, 2008
Int. Cl. C08F 4/10 (2006.01); C08F 4/16 (2006.01); C08F 4/12 (2006.01)

U.S. Cl. 428—402 [428/523; 526/90; 526/102; 526/123.1]

6 Claims

1. Ethylene-based polymer microparticles obtained by a process comprising polymerizing ethylene alone or ethylene with at least one monomer selected from linear or branched α-olefins having 3 to 6 carbon atoms, cycloolefins, polar group-containing olefins, dienes, trienes, and aromatic vinyl compounds, in the presence of a polymerization catalyst component comprising a solid catalyst component,

wherein the solid catalyst component comprises a transition metal compound or a liquid titanium compound, which compound being supported on non-agglomerated spherical magnesium-containing microparticles,

wherein the non-agglomerated spherical magnesium-containing microparticles contain a magnesium atom, an aluminum atom, and an alkoxy group having 1 to 20 carbon atoms, wherein the non-agglomerated spherical magnesium-containing microparticles are insoluble in hydrocarbon solvents, wherein the non-agglomerated spherical magnesium-containing microparticles have a median diameter (d₅₀) measured by laser diffraction scattering of 0.1 μm≤d₅₀≤5 μm, and a variation coefficient of particle diameter (Cv) or 20% or less, and

wherein the ethylene-based polymer microparticles have properties (A) to (E) below simultaneously:

(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 having an opening of 37 μm, (C) the median diameter (d₅₀) measured by laser diffraction scattering is 3 μm≤d₅₀≤25 μm, (D) the circularity coefficient is 0.85 or more, and (E) the variation coefficient of particle diameter (Cv) is 20% or less.