To provide a keyboard device which is capable of embodying a navigation function easily understandable and easy to use even to a beginner and has good-quality keys and a composition for the white keys and composition for the black keys for such keyboard device.
This keyboard device has the white keys 3 consisting of the composition for the white keys containing 100 pts.wt. base polymer, 0.01 to 10.00 pts.wt. light diffusing agent and 0.1 to 1.5 pts.wt. a white coloring agent essentially consisting of titanium dioxide and the composition for the black keys containing 100 pts.wt. base polymer, 0.01 to 10.00 pts.wt. light diffusing agent and 0.01 to 1.50 pts.wt. carbon black as a black coloring agent. The light diffusing agent of the composition for the white keys is preferably a PMMA(polymethyl methacrylate) crosslinking body or barium sulfate and the light diffusing agent of the composition for the black keys is preferably the PMMA crosslinking body.
TOMITA IWAO
NAKANISHI HIROMASA
NARITA SHINICHI
