Other

Cabot Corporation

John M Funt

Bruce E MacKay

Bin Chung

Mark A Wilkinson

Chiung-Huei Shieh

George B Ouyang

Andrew Austin Guilfoy

EPDM compositions comprising EPDM and specified carbon blacks which, when extruded or shaped, exhibit either a highly gloss or a textured matte finish. The carbon black is present in an amount of 100 to about 300, and more preferably about 150 to about 250, parts by weight per 100 parts by weight EPDM.

Carbon black containing EPDM compositions having either a high gloss or a textured matte finish

A conductive polymer composition having PTC characteristics comprising a polymer matrix, constituting from 20 to 98 percent by weight of the composition, throughout which is dispersed a mixture of conductive carbon blacks constituting from 2 to 80 percent by weight of the composition, the mixture comprising a first conductive carbon black and a second conductive carbon black, each of the carbon blacks having a structure level, as measured by DBP technique, of 40 to 150 cc/100 g and each constitutes from 1 to 40 percent 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.

Conductive polymer compositions

A method of abrading a tire tread compound to measure its irregular wear characteristics, includes the steps of abrading each of a plurality of sample wheels in rotating engagement with a respective abrasive member. An outer layer of each sample wheel is made of a tire tread compound to be abraded. The velocity of the sample wheels relative to the velocity of the abrasive members defines a first slip value. Each sample wheel is abraded in rotating engagement with a plurality of abrasive members at the first slip value. The loss of the tire tread compound of each sample wheel at the first slip value is then measured. Each sample wheel is then abraded in rotating engagement with a plurality of respective abrasive members at a second slip value. The loss of the tire tread compound of each sample member at the second slip value is then measured. Each sample wheel is then abraded in rotating engagement with a plurality of respective abrasive members at a third slip value. The loss of the tire tread compound due to abrasion at the third slip value is then measured. The second slip value causes a higher level of abrasion severity than the first slip value. The third slip value in turn causes a higher level of abrasion severity than the second slip value. The irregular wear characteristics of the tire tread compound is measured based on the loss of the compound due to abrasion at each of the different slip values.

Method of abrading

Growing community of inventors

Nashua, NH, United States of America

John M Funt