C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 101/00 (2006.01) C08K 3/04 (2006.01) C08L 101/12 (2006.01) C09D 11/00 (2006.01) C09D 11/10 (2006.01)
Patent
CA 2067721
A conductive polymer composition having PTC characteristics comprising a polymer matrix, constituting from 20 to 98 per cent by weight of the composition, throughout which is dispersed a mixture of conductive carbon blacks constituting from 2 to 80 per cent by weight of the composition, the mixture comprising a first conductive carbon black and a second conductive carbon black, is characterised in that each of the carbon blacks has a structure level, as measured by DBP technique, of 40 to 150 cc/100g and each constitutes from 1 to 40 per cant by weight of the composition, the first carbon black comprising particles having average size in the range from 35 to 300 nm and the second carbon black comprising particles having average size in the range from 15 to 25 nm.
Funt John M.
Guilfoy Andrew A.
Cabot Plastics Limited
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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