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AssigneeTokai Rubber Industries, Ltd.
InventorsTakahiro Nishiyama, Shinobu Kanbe, Atsuo Miyajima, Kazuhiro Kato
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A relatively small amount of a plasticizer having an SP value of at least 8.8 and a molecular weight of at most 550 is added to blend rubber of NBR-PVC in which NBR has an AN content of from 43 to 50% by weight. The fuel impermeability and the low-temperature flexibility of the resulting rubber composition are improved to be comparable to those of FKM, and the amount of the plasticizer and its reaction product to be released from the rubber composition in fuel is reduced. Adding a controlled amount of carbon black to the rubber composition makes the composition have favorable electroconductivity. The rubber composition is formed into hoses or electroconductive hoses of low fuel permeation.
A rubber composition for hoses of low fuel permeation, which comprises NBR having a combined acrylonitrile content (AN content) of from 43 to 50% by weight, PVC blended with the NBR, and a plasticizer having a solubility parameter (SP) value of at least 8.8 and a molecular weight of at most 550 added to the NBR-PVC blend.
A rubber composition for electroconductive hoses of low fuel permeation, which comprises NBR having a combined acrylonitrile content (AN content) of from 43 to 50% by weight, PVC blended with the NBR, a plasticizer having a solubility parameter (SP) value of at least 8.8 and a molecular weight of at most 550 added to the NBR-PVC blend, and CB added to the NBR-PVC blend to lower the volume specific resistance of the blend to at most 108 Ω·cm.
Dependencies are inferred from the claim text.