| 摘要 |
<p>A liner for a plastic closure includes styrene-isobutylene-styrene (SIBS) blended with a resin polymer. This resin polymer preferably includes ethylene propylene diene monomer (EPDM rubber). The SIBS preferably is in an amount in the range of 10 to 90% by weight, more preferably 30 to 60% by weight, with an amount of about 46% by weight being particularly preferred. The resin polymer preferably is in an amount in the range of 10 to 90% by weight, more preferably 30 to 50% by weight, with an amount of about 41% by weight being particularly preferred. The EPDM rubber preferably is an elastomeric alloy of EPDM rubber and polypropylene. Mineral oil preferably is present, if at all, in an amount not more than 20% by weight. The liner may include up to 8% by weight process aids such as lubricant and up to 5% compatibilizer by weight.</p> |
