Dimensionally heat-recoverable articles.

摘要

Polymer compositions used in the manufacture of heat-shrink products for high-voltage electrical applications and which can be white or coloured comprise (i) a polymeric base comprising at least one polymer having a main chain comprising carbon atoms and optionally oxygen and/or nitrogen atoms but no other hetero-atoms crosslinked to a condition in which it is dimensionally heat-recoverable and has a recovery temperature not less than 80 DEG C and, per hundred parts of the base (by weight); (ii) 40 to 120 parts of mineral filler of which (a) at least half, subject to a minimum of 30 parts, is calcium carbonate with a number average particle size in the range 0.01 to 50 micro metre and containing substantially no particles with a dimension in excess of 100 micrometre; (b) up to 20 parts may be an inert mineral filler, and; (c) the balance, if any, is an active flame-retardant filler. They may include also one or more pigment; one or antioxidant and/or ultra-violet stabiliser; one or more acid acceptor; and one or more processing aid.