03988399 is referenced by 21 patents and cites 7 patents.

Described herein are articles which are heat recoverable in involute fashion to an overlapping, generally cylindrical configuration and which are useful as wrap-around sleeves for wires, cables, cable splices and the like. Also described are articles initially heat recoverable to an elongate S-shaped configuration, which latter can be wrapped about an elongate substrate, the edge portions thereof interlocked, and heat recovered to form a protective closure. The articles of the invention comprise a molecularly oriented unitary polymeric layer which has been differentially annealed while restrained against dimensional change and cross-linked to provide an anisotropic gradient from a first to a second primary face of the layer through the thickness thereof. Subsequently, when the article is heated to recovery temperature, regions of high anisotropy adjacent one primary face of the layer shrink. Because of the annealing process, regions adjacent the opposite primary face of the layer tend to resist linear shrinkage, whereupon the article heat recovers in involute fashion to form a wrap-around sleeve.

This is a division of application Ser. No. 130,730, filed April 2, 1971, now U.S. Pat. No. 3,847,721.

Title
Heat recoverable articles and methods therefor
Application Number
130730
Publication Number
3988399
Application Date
June 10, 1974
Publication Date
October 26, 1976
Inventor
Joseph H Evans
Palo Alto
CA, US
Agent
Lyon & Lyon
Assignee
Raychem Corporation
CA, US
IPC
B32B 3/04
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