Keypad made from thermoplastic polyurethane resin and method for forming thereof
OwnerHisaaki Matsuda, Shohei Tsunoda +1inventors
InventorsHisaaki Matsuda, Shohei Tsunoda, Kazuro Hoshino
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Abstract
A keypad of TPU obtained from a TPU sheet by thermoforming, wherein said TPU sheet is a melt-formed product of resin pellets resulting from reaction between an organic diisocyanate (A) composed mainly of hexamethylenediisocyanate (A1), a high-molecular weight polyol (B) composed mainly of polycarbonate diol (B1), and a chain extender (C) composed mainly of an aliphatic diol (C1) having 2 to 10 carbons. The TPU used in the present invention excels in secondary formability, oleic acid resistance, discoloration resistance, clarity, and printability.
Claims6
1-3. (canceled)
A keypad of polyurethane resin obtained from a thermoplastic polyurethane resin sheet by thermoforming, wherein said thermoplastic polyurethane sheet is a melt-formed product of resin pellets resulting from reaction between an organic diisocyanate (A) composed mainly of hexamethylenediisocyanate (A1), a high-molecular weight polyol (B) composed mainly of polycarbonate diol (B1) obtained from 3-methyl-1,5-pentanediol and a low-molecular weight carbonate by condensation reaction, and a chain extender (C) composed mainly of an aliphatic diol (C1) having 2 to 10 carbons.
Dependencies are inferred from the claim text.