Polyolefin bottles with glossy surface
AssigneeDu Pont Canada Inc.
InventorsAllan W. Duff, Heinz P. Krysmanski, Helga A. Plishka
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Abstract
A bottle having a glossy surface, with a gloss of at least 50 on its external surface. The bottle has its external surface formed from a polymer selected from linear polyethylene having a density of at least about 0.940 g/cm.sup.3, a melt index of less than 2.0 dg/min and a stress exponent of less than 1.5. Preferably the polymer contains at lease 400 ppm of a fluoroelastomer processing aid. A process for making bottle with a glossy surface, consisting essentially of blow moulding polymer in continuous extrusion blow moulding apparatus or injection blow moulding apparatus, using a mould with a polished surface and a shear rate of less than 10 000 sec.sup.-1.
Claims4
A monolayer blow molded bottle having a glossy external surface, said monolayer bottle consisting essentially of a polymer selected from linear polyethylene having a density of at least 0.940 g/cm.sup.3, a melt index of less than 2.0 dg/min, a stress exponent of less than 1.5, and containing at least 400 ppm of a fluoropolymer processing aid, said monolayer bottle having a gloss of at least 50 on its external surface.
Dependencies are inferred from the claim text.