Polyolefin concentrate

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B - Operations, Transporting

29

B

18/946

B29B 9/00 (2006.01) C08J 3/12 (2006.01) C08J 3/20 (2006.01) C08L 23/06 (2006.01)

Patent

CA 1289711

ABSTRACT A process for making compacted particulate polyolefin compositions is described. The process comprises: a) thoroughly mixing a molten blend of a polyolefin and at least one modifying agent; b) cooling said blend to a temperature below the melting temperature of the polyolefin, while masticating the blend; and c) continuing to masticate the blend and subsequently extruding said blend below its melting temperature to produce strands or pellets in crumble form. The modifying agent may be solid or liquid at S.T.P. and should be mobile at processing temperatures. Examples of modifying agents include polyalkylene glycols, polyisobutylene. A preferred polyolefin is polyethylene. It is preferable that the process take place in a twin-screw extruder.

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