Uhmw polyethylene molding compositions from multistage...

Details Uhmw polyethylene molding compositions from multistage... Uhmw polyethylene molding compositions from multistage...

C - Chemistry, Metallurgy

08

L

400/6501, 400/65

C08L 23/04 (2006.01) C08F 10/02 (2006.01)

Patent

CA 1282518

ABSTRACT OF THE DISCLOSURE A molding composition is disclosed which comprises ultralhigh molecular weight polyethylene having an intrinsic viscosity of 10 - 30 d?/g at 135°C in decalin. Improved injection moldability is provided by the use of such polyethylene obtainable by a multi-stage polymerization reaction including at least the following two stages: (a) a first stage in which ethylene is polymerized using a specified composite catalyst in the absence of hydrogen or its presence at lower concentration to produce 50 - 99.5 weight parts of polyethylene having an intrinsic viscosity of 12 - 32 d?/g at 135°C in decalin; and (b) a second stage in which a fresh feed of ethylene is polymerized in the presence of hydrogen at higher concentration to produce 50 - 0.5 weight parts of polyethylene having an intrinsic viscosity of 0.1 - 5 d?/g at 135°C in decalin.

507339

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