| 摘要 |
A heat recoverable tubular composite article (4) comprising an inner layer (5) comprising a crosslinked elastomeric polymeric material having a modulus at 100% elongation at 20 DEG C of about 40 to about 900 pounds per square inch and an outer layer (3) comprising a thermoplastic material having a 2% secant modulus at 20 DEG C of about 5,000 to about 100,000 pounds per square inch said composite article (4) being formed by coextrusion, having a direct bond between said layers with a peel strength of at least 6 pounds per linear inch, and being in a radially expanded configuration, said thermoplastic outer layer (3) being capable of retaining the elastomeric inner layer (5) in an expanded configuration at ambient temperature and incapable of retaining the elastomeric layer (5) in an expanded configuration at a temperature above a predetermined temperature thereby permitting the composite article (4) to recover to or toward its unexpanded configuration. |
