They also filed a patent on copper rotor construction
http://road.cc/...disc-rotors-could-be Shimano filed another patent application in 2016, published last month, for a disc brake rotor where the braking surfaces are made of copper or a copper alloy with a layer of aluminium or aluminium alloy between them.
“One potential advantage of such a configuration is that the heat conductivity and powerful braking properties of the copper or the copper alloy and the heat dissipation of the aluminium or aluminium alloy are combined,” says Shimano.
The patent application also covers layers of iron or an iron alloy (presumably steel) with layers or copper. No mention is made of the composition of the pads that would be used with these rotors.
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