Heat recoverable coextruded articles

Details Heat recoverable coextruded articles Heat recoverable coextruded articles

1985-04-04

1987-01-06

Martin, Roland E.

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

428913, 174DIG8, 156 86, 138141, F16L 914

Patent

active

046346155

ABSTRACT:
A heat recoverable tubular composite article comprising an inner layer comprising a crosslinked elastomeric polymeric material having a modulus at 100% elongation at 20.degree. C. of about 40 to about 900 pounds per square inch and an outer layer comprising a thermoplastic material having a 2% secant modulus at 20.degree. C. of about 5,000 to about 100,000 pounds per square inch said composite article (1) being formed by coextrusion, (2) having a direct bond between said layers with a peel strength of at least 6 pounds per linear inch, and (3) being in a radically expanded configuration, said thermoplastic outer layer being capable of retaining the elastomeric inner layer in an expanded configuration at ambient temperature and incapable of retaining the elastomeric layer in an expanded configuration at a temperature above a predetermined temperature thereby permitting the composite article to recover to or toward its unexpanded configuration.

REFERENCES:
patent: 3950604 (1976-04-01), Penneck
patent: 4035534 (1977-07-01), Nyberg
patent: 4168192 (1979-09-01), Nyberg
patent: 4383131 (1983-05-01), Clabburn
patent: 4390745 (1983-06-01), Bottcher et al.

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