Stretched polyolefin materials and objects produced therefrom

B - Operations – Transporting – 32 – B

Patent

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Details

B32B 27/18 (2006.01) B32B 27/32 (2006.01) C08J 5/18 (2006.01)

Patent

CA 2677422

The invention is directed to stretched polyolefin materials having an E-modulus of at least 17 GPa, preferably at least 20 GPa and a strength of at least 400 MPa, comprising a polyolefin and a nano-material, such as a nucleating agent, which material is obtainable by a process comprising a stretching step wherein the material is stretched at a stretch ratio of at least 16. The materials of the invention can be produced by a process comprising the steps of: providing a compound of a polyolefin material and a nano-material, e.g. a nucleating agent, wherein the nano-material is dispersed preferably on a molecular scale in the polyolefin material, extruding this compound, followed by a stretching step wherein the material is stretched to a total stretch ratio of at least 16.

L'invention porte sur des matériaux de polyoléfine étirés ayant un module E d'au moins 17 GPa, de préférence d'au moins 20 GPa et une résistance d'au moins 400 Mpa. Ces matériaux comprennent une polyoléfine un nano-matériau, tel qu'un agent de nucléation, lequel matériau est susceptible d'être obtenu par un procédé comprenant étape d'étirage dans laquelle le matériau est étiré à un rapport d'étirage d'au moins 16. Les matériaux de l'invention peuvent être obtenus par un procédé comprenant les étapes consistant à : se procurer un mélange d'un matériau de polyoléfine et d'un nano-matériau, par exemple, un agent de nucléation, le nano-matériau étant dispersé de préférence à l'échelle moléculaire dans le matériau de polyoléfine, extruder ce mélange, en faisant suivre par une étape d'étirage dans laquelle le matériau est étiré à un rapport total d'étirage d'au moins 16.

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