Ethylene-alpha-olefin copolymer powder for powder molding

Details Ethylene-alpha-olefin copolymer powder for powder molding Ethylene-alpha-olefin copolymer powder for powder molding

C - Chemistry, Metallurgy

08

F

402/584, 402/622

C08F 210/16 (2006.01)

Patent

CA 1131398

ABSTRACT OF THE DISCLOSURE Ethylene-alpha-olefin copolymer powder suitable for use in powder molding is disclosed. This copolymer powder has: (A) a density of 0.915 through 0.945 g/cm3; (B) a melt index of 1 through 80 g/10 min.; (C) a ratio of the high-load melt index under 21.6 kg to the low-load melt index under 2.16 kg of not more than 30; (D) a bulk density of 0.30 through 0.50; (E) an angle of repose of 25° through 40°, and; (F) a particle size distribution such that the 50% particle diameter of the powder is within the range of 230 to 350 microns and the particle diameter of at least 90% by weight of the total powder is within the range of 149 to 500 microns. This powder is in the form of a sphere, ellipsoid or the similar form and contains no substantial amount of the clear side, arris and thread-like or whisker-like portion, and is obtained from suspension polymerization of ethylene and alpha-olefin(s).

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