Raychem Limited

Tyco Electronics Raychem Gmbh

Tyco Electronics UK Ltd

Timothy S Smith

David Francis Pearce

John David Stoker

Hans E Lunk

Stephen L Tondre

Alan S Yeung

David W Thornley

Richard Graf

Thomas Rohde

Bernd Graeve

Richard J Murphy

Peter Greiner

Franz Josef Toerringer

John Stoker

A multi-layer heat-shrinkable tubular sleeve () comprises an outer layer () and an inner layer (). The outer layer () is arranged around the inner layer (). The outer layer () comprises a partially crystalline thermoplastic material with a major part of partially crystalline thermoplastic material with a crystallinity of more than 60%. The inner layer () comprises a partially crystalline thermoplastic material or an elastomeric material.

Multi-layer heat shrinkable tubular sleeve

A heat-shrink tube for an electrical power cable comprises a sleeve having an insulating inner layer, a conductive outer layer and a thermoplastic mid-layer located between the inner and outer layers. The mid-layer is recovered by the application of heat thereto. The insulating inner layer is preferably comprised of an elastomeric material and the thermoplastic mid-layer is rigid and acts to retain the inner layer in a radially expanded state prior to its recovery.

Heat-shrink tube

Compositions containing at least about 30% of a poly(alkylene terephthalate), at least about 3% of a polylactone, about 0.05% to about 10% of a carbodiimide and at least about 0.05% to about 10% of an aliphatic phosphite, all percentages being by weight based on the weight of the composition, has excellent thermal stability. The compositions are useful for wire insulation and cable jacketing. Heat recoverable articles, such as tubing and molded parts can be prepared from the compositions.

Stabilized polymeric compositions

Electric wire and cable

Polymeric cladding for elongate substrates, preferably electrical conductors, comprises an inner layer and an outer layer, the outer layer being a cross-linked polymer composition filled with halogen-free particulate inorganic flame-retardant filler which has been treated with material which increases the elongation to break of the composition at 200.degree. C. to at least 50%. The enhanced elongation enables the cladding better to resist burning, possibly by reducing the tendency for the outer layer to split when exposed to fire. Bundles of insulated electrical wires may be wrapped in mineral tape, preferably mica tape, to provide circuit integrity cables which are significantly smaller and/or lighter than previously known.

Cable with flame retarded cladding

Growing community of inventors

Trowbridge, United Kingdom

Timothy S Smith