Patent ID: 9493628
Filing Date: 2016-11-15
CPC Classification: C08K,C08L

Claim Text:
1. A rubber hose material made of an EPDM rubber composition, the EPDM rubber composition consisting essentially of: 100 parts by weight of an EPDM rubber blended together with: 135 to 180 parts by weight carbon black; 55 to 100 parts by weight a softening agent; a blending ratio of carbon black/softening agent being from 1.8 to 2.5; 0.4 to 1.5 parts by weight of powdered sulfur as a vulcanizing agent; 0.4 to 0.9 parts by weight of sulfur contained within a sulfur compound selected from the group consisting of sulfur compounds that release sulfur at the time of vulcanization; 1.0 to 1.7 parts by weight of a total sulfur blending amount, the total sulfur blending amount including the weight of the powdered sulfur and the weight of the sulfur contained within the sulfur compound; and a blending amount of all components of the EPDM rubber composition from which the powdered sulfur as a vulcanizing agent and the sulfur compound are excluded is from 300 to 400 parts by weight, wherein the EPDM rubber composition has a Mooney viscosity of 100 at 100° C., and a vulcanized composition thereof has a rate of rigidity change satisfying the following equation (1):