Bottle closures made of polyolefins

C - Chemistry – Metallurgy – 09 – K

Patent

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Details

C09K 3/10 (2006.01) C08L 23/10 (2006.01) C08L 23/16 (2006.01) C08L 23/04 (2006.01) C08L 23/12 (2006.01)

Patent

CA 2320143

A bottle closure comprising an olefin polymer composition (A) which comprises: 1) 90-100 % by weight of a crystalline propylene homopolymer or propylene/C2- C10 .alpha.-olefin random copolymer; said polymers containing at least 94 % by weight a fraction insoluble in xylene at room temperature; and 2) 0-10 % by weight of an ethylene/C3-C10 .alpha.-olefin elastomeric copolymer; provided that when the amount of Polymer (2) is 0 % by weight, Polymer (1) is selected from the above said random copolymers. Said composition (A) having a flexural elastic modulus value at 23 ~C at least of 1620 MPa; a value of the strength at yield at 23 ~C at least of 33 MPa; and an IZOD impact resistance value at 0 ~C at least of 2.5 kJ/m2.

L'invention concerne une fermeture de bouteille contenant une composition polymère d'oléfine (A) qui comprend: 1) 90-100 % en poids d'un homopolymère de propylène cristallin ou d'un copolymère aléatoire propylène/.alpha.-oléfine C¿2?-C¿10?; lesdits polymères contenant au moins 94 % en poids d'une fraction insoluble dans le xylène à température ambiante ; et 2) 0-10 % en poids d'un copolymère élastomère éthylène/.alpha.-oléfine C¿3?-C¿10?; à condition que, lorsque la proportion de polymère (2) est égale à 0 % en poids, le polymère (1) soit sélectionné parmi lesdits copolymères aléatoires. La composition (A) présente un module d'élasticité en flexion à 23 ·C d'au moins 1620 MPa; une limite d'élasticité à 23 ·C d'au moins 33 MPa; et une résistance au choc IZOD à 0 ·C d'au moins 2,5 kJ/m?2¿.

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