Methods of making thick, highly oriented, opaque,...

Details Methods of making thick, highly oriented, opaque,... Methods of making thick, highly oriented, opaque,...

C - Chemistry, Metallurgy

08

J

C08J 5/18 (2006.01) B29C 55/12 (2006.01) C08L 23/16 (2006.01)

Patent

CA 2523949

A method of making a polyolefin film in accordance with this invention includes the steps of: blending a propylene block copolymer with a beta nucleating agent; extruding a film layer from the blend and providing a total area draw ratio in excess of 20, where at least one part of the stretching occurs at < 120~C, for forming the film with a density no greater than 0.40g/cm~ and a thickness greater than 160 gauge. The film also constitutes a part of this invention.

L'invention porte sur un procédé de fabrication d'un film de polyoléfine, ce procédé consistant à : mélanger un copolymère bloc de propylène avec un agent de nucléation bêta; extruder une couche de film du mélange et obtenir un rapport d'étirage de surface totale dépassant de 20, au moins une partie de l'étirement survenant à < 120 ·C, de façon à former le film don't la densité est inférieure ou égale à 0,40g/cm?3¿ et ayant une épaisseur supérieure à 160. Le film constitue également une partie de cette invention.

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