Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Patent
1985-12-05
1987-04-07
Martin, Roland E.
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
174DIG8, 138 99, 138141, 156 52, 156 86, 15624413, 15624424, F16L 914, B32B 3100
Patent
active
046560700
ABSTRACT:
A shrinkable tubular article comprises a tubular inner elastomeric member held in a radially expanded configuration by a tubular outer restraining means. The restraining means is prepared from a blend of a relatively rigid thermoplastic material and a segmented copolymer having at least one segment compatible with the thermoplastic and at least one segment compatible with the elastomer of the inner member. Optionally, the restraining means contains a tackifier. The inner surface of the outer member and the outer surface of the inner member are directly bonded together (i.e. without an interfacial adhesive). The bond between the members is sufficiently strong to restrain the inner elastomer member from shrinking to, or toward, its unexpanded configuration. In addition, the bond weakens sufficiently on application of solvent to permit the elastomeric member to peel away from the restraining outer member. Use of a blend of a thermoplastic and a segmented copolymer and optional tackifier, described above, for the restraining member permits the article to be produced in a continuous manner, e.g. by coextrusion.
REFERENCES:
patent: 4035534 (1977-07-01), Nyberg
patent: 4070746 (1978-01-01), Evans et al.
patent: 4135553 (1979-01-01), Evans et al.
patent: 4179320 (1979-12-01), Midgley et al.
patent: 4338970 (1982-07-01), Krackeler et al.
patent: 4523970 (1985-06-01), Toy
Chang Rong J.
Nyberg David D.
Toy Lester T.
Burkard Herbert G.
Martin Roland E.
Raychem Corporation
Rice Edith A.
Seidleck James J.
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