High otr films made from homopolymer polypropylene and...

Details High otr films made from homopolymer polypropylene and... High otr films made from homopolymer polypropylene and...

C - Chemistry, Metallurgy

08

J

C08J 5/18 (2006.01) B32B 27/32 (2006.01) C08L 23/12 (2006.01) C08L 23/18 (2006.01)

Patent

CA 2524854

A polyolefin blend having in a range of 40 to less than 90% by weight of a high modulus, isotactic polypropylene; and in a range of 10 to 60% by weight of a 1-butene/ethylene copolymer; the 1-butene/ethylene copolymer having about 0.5 to about 10 wt% of an ethylene. A polyolefin blend can be in a form of a transparent, oriented film having a biaxially oriented layer with an oxygen transmission rate of at least about 200 cc/100 sq. in./day/atmosphere (3077cc/sq. m./24h/atmosphere), a tensile modulus of at least about 160,000 psi (1.103 GPa) and a haze value of no greater than about 3% measured at a thickness of about 1 mil (25~m).

L'invention concerne un mélange polyoléfinique se composant de 40 à moins de 90 % en poids d'un polypropylène isotactique à module élevé, et de 10 à 60 % de copolymère de 1-butène/éthylène, le copolymère de 1-butène-éthylène possédant environ 0,5 à 10 % en poids d'éthylène. Un mélange polyoléfinique peut se présenter sous la forme d'un film orienté transparent possédant une couche orientée biaxialement et présentant un taux de transmission de l'oxygène d'environ 200 cc/100 po carré/jour/atmosphère (3077 CC/m?2¿/24h/atmosphère), un module d'élasticité en traction d'au moins environ 160 000 psi (1 103 Gpa) et une valeur de turbidité d'au plus 3 % mesurée à une épaisseur d'environ 1 mil (25µm).

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