Patent ID: 9688834
Date: 2017-06-27
CPC Classifications: B32B,C08K,Y10T

Claim:
1. An NBR composition comprising an acrylonitrile-butadiene rubber (NBR) polymer, a vulcanizing agent, a vulcanizing accelerator, and carbon black, wherein the carbon black includes a combination of medium thermal (MT) carbon black and at least one kind of carbon black selected from carbon black having an iodine absorption number of 20 mg/g or less and a dibutyl phthalate (DBP) absorption number of 40 cm 3 /100 g or more, and the MT carbon black and the carbon black having the iodine absorption number of 20 mg/g or less and the DBP absorption number of 40 cm3/100 g or more are added in a total amount of 110 to 250 parts by weight based on 100 parts by weight of the NBR polymer, the amount of the MT carbon black is larger than the carbon black having an iodine absorption number of 20 mg/g or less and a DBP absorption number of 40 cm 3 /100 g or more, and the amount of the carbon black having an iodine absorption number of 20 mg/g or less and a DBP absorption number of 40 cm 3 /100 g or more is 10 to 70 parts by weight based on 100 parts by weight of the NBR composition and a vulcanizing agent is sulfur.