Heat recoverable article

Details Heat recoverable article Heat recoverable article

B - Operations, Transporting

29

C

18/978

B29C 65/68 (2006.01) B29C 61/06 (2006.01) B29C 65/00 (2006.01) B29C 65/18 (2006.01) B29C 65/34 (2006.01) G02B 6/38 (2006.01) G02B 6/44 (2006.01) H05B 3/06 (2006.01) H05B 3/14 (2006.01)

Patent

CA 1321697

ABSTRACT A heat recoverable article comprising a conductive poly- meric material with particular electrical properties. Preferably, when expanded from X% to Y% to render it reco- verable the resistivity of the composition decreases on expansion in at least part of the X -Y expansion range. Preferably the composition exhibits a pseudo PTC ratio (peak resistivity/resistivity at 25°C) in the range 1? - 10. Preferably the composition has a resistivity which increases on recovery as measured in the direction of current flow, throughout the temperature range 20°C to Te (extrapolated end temperature) The article is preferably tubular, and the electrical behaviour allows it to be conveniently electroded with elongate electrodes, while avoiding overheating during recovery.

576761

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