Ethylene-based polymer microparticles, functional...

Details Ethylene-based polymer microparticles, functional... Ethylene-based polymer microparticles, functional...

2005-11-18

2009-10-13

Le, H. (Holly) T (Department: 1794)

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

C428S523000, C526S090000, C526S102000, C526S123100

Reexamination Certificate

active

07601423

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 (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. 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.

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“Conspectus of Coating Techniques in Plastics”, Industrial Technique Service Center, 1989, pp. 251-293 (partial translation attached)*.

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