Polyethylene molding powder and porous articles made therefrom

Details Polyethylene molding powder and porous articles made therefrom Polyethylene molding powder and porous articles made therefrom

C - Chemistry, Metallurgy

08

J

C08J 3/12 (2006.01) C08J 9/00 (2006.01) C08J 9/24 (2006.01) C08L 23/06 (2006.01)

Patent

CA 2561893

The present invention relates to a new molding powder comprising polyethylene polymer particles. The molecular weight off the polyethylene polymer is within the range of from about 600,000 g/mol to about 2,700,000 g/mol as determined by ASTM 4020. The average particle size of the particles of the polyethylene polymer is within the range of from about 5 microns to about 1000 microns and the polyethylene has a powder bulk density in the range of from about 0.10 to about 0.30 g/cc. Also disclosed is a process for molding a shape from a molding powder comprising the inventive polyethylene polymer particles, as well as porous articles made in accordance with the process. The articles have excellent porosity and good strength for porous and porous filtration applications.

L'invention concerne une nouvelle poudre à mouler contenant des particules polymères polyéthylène. Le poids moléculaire du polymère polyéthylène est compris entre environ 600 000 g/mol et environ 2 700 000 g/mol, tel que déterminé par ASTM 4020. La taille moyenne des particules du polymère polyéthylène est comprise entre environ 5 microns et environ 1000 microns, et le polyéthylène présente une masse volumique apparente de poudre comprise entre environ 0,10 et environ 0,30 g/cc. L'invention concerne également un procédé de moulage d'une forme à partir de la poudre à mouler contenant lesdites particules polymères polyéthylène, ainsi que des articles poreux obtenus par la mise en oeuvre de ce procédé. Ces articles présentent une excellente porosité et une bonne résistance pour des applications poreuses et de filtration poreuses.

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