Bottle closures made of polyolefins
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United States of America Patent
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Jun 3, 2003
Grant Date -
N/A
app pub date -
Oct 16, 2000
filing date -
Dec 24, 1998
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Abstract
A bottle closure made from an olefin polymer composition (A) which includes: 1) 90-100% by weight of a crystalline propylene homopolymer or propylene/C.sub.2 -C.sub.10 alpha-olefin random copolymer, those polymers containing at least 94% by weight of a fraction insoluble in xylene at room temperature; and 2) 0-10% by weight of an ethylene/C.sub.3 -C.sub.10 alpha-olefin elastomeric copolymer, provided that when the amount of polymer (2) is 0% by weight, polymer (1) is one of the above random copolymers. Said composition (A) has a flexural elastic modulus value at 23.degree. C. of at least 1620 MPa, a strength at yield at 23.degree. C. of at least 33 MPa, and an IZOD impact resistance at 0.degree. C. of at least 2.5 kJ/m.sup.2.
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