Importance

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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.

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First Claim