To improve weatherability, low-temperature properties, and adhesion properties by laminating an unvulcanized rubber layer containing polyamine compounds in a rubber other than fluororubber containing carboxyl groups to an unvulcanized rubber layer comprising fluororubber, as a principal component, to vulcanize both the layers.
An unvulcanized rubber layer containing polyamine compounds in a rubber containing carboxyl groups other than fluororubber is laminated to an unvulcanized rubber layer comprising fluororubber, as a principal component, to vulcanize both the layers. The fluororubber composition is a binary copolymer of vinylidenefluoride-hexafluoropropene, and the component of the rubber other than fluororubber containing carboxyl groups is preferably NBR, NV, hydrogenated NBR. And as the rubber containing carboxyl groups, carboxylated NBR, copolymer of carboxylated liquid polybutadiene, etc., are used, and the ratio of carboxyl groups is 0.1-15 wt.%. The polyamine compound is hexamethylene diamine carbamate or others.
KOBAYASHI NOBUTOSHI
GOTOU HIDEKATSU
