EYEWEAR MATERIAL, EYEWEAR FRAME, AND EYEWEAR

摘要

The eyewear material is an eyewear material containing thermoplastic polyurethane. The eyewear material has a tan δ peak at both less than 0° C. and 0° C. or more and 70° C. or less observed in dynamic viscoelasticity measurement in tensile mode under the measurement conditions of a temperature increase speed of 5° C./min and a measurement frequency of 10 Hz.

主权项

1. An eyewear material which is
a preparation prepared from thermoplastic polyurethane as a reaction product produced by reaction of a polyisocyanate component containing methylenebis(cyclohexyl isocyanate) and/or bis(isocyanatomethyl) cyclohexane with an active hydrogen group-containing component, and used in production of at least one kind selected from the group consisting of an eyewear frame, a nose pad, an earpiece, a temple, a rim, a bridge, an end piece and a hinge, wherein the eyewear material has a tan δ peak at both less than 0° C. and 0° C. or more and 70° C. or less observed in dynamic viscoelasticity measurement in tensile mode under the measurement conditions of a temperature increase speed of 5° C./min and a measurement frequency of 10 Hz.