Charles D Reid

US Patent:

60867922, Jul 11, 2000

Filed:

Jun 30, 1999

Appl. No.:

9/345061

Inventors:

Charles G. Reid - Millington NJ
Norman M. Burns - Clinton NJ

Assignee:

Union Carbide Chemicals & Plastics Technology Corporation - Danbury CT

International Classification:

H01B 124
H01B 717

US Classification:

252511

Abstract:

A semiconducting composition comprising (i) an olefinic polymer and (ii) about 25 to about 45 percent by weight, based on the weight of the composition, of a carbon black having the following properties: (a) a particle size of at least about 29 nanometers; (b) a tint strength of less than about 100 percent; (c) a loss of volatiles at 950 degrees C in a nitrogen atmosphere of less than about 1 weight percent based on the weight of the carbon black; (d) a DBP oil absorption of about 80 to about 300 cubic centimeters per 100 grams; (e) a nitrogen surface adsorption area of about 30 to about 300 square meters per gram or an iodine adsorption number of about 30 to about 300 grams per kilogram; (f) a CTAB surface area of about 30 to about 150 square meters per gram; and (g) a ratio of property (e) to property (f) of greater than about 1. 1.