Manufacture of extruded products

Details Manufacture of extruded products Manufacture of extruded products

B - Operations, Transporting

29

C

18/800

B29C 47/00 (2006.01) C08F 255/00 (2006.01) C08F 291/00 (2006.01) C08L 43/04 (2006.01)

Patent

CA 1066010

A B S T R A C T In a method of making a cross-linked extruded product from polyethylene of other suitable polymer, the polymer is metered into a screw extrusion machine together with compound- ing ingredients comprising a hydrolysable unsaturated silane, a free-radical generator and a silanol condensation catalyst. The compounding ingredients are blended with the polymer in the barrel of the extruder and the mixture is heated sufficiently to effect grafting of silane groups to the polymer, the amount of free-radical generator being sufficiently low to limit direct free-radical cross-linking to a level that will not prevent ext- rusion of the material. The reaction mixture is extruded directly from the same extruder through an extrusion die to form an elong- ate shaped product and cross-linking is effected by subjecting the shaped product to the action of moisture.

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