US Patent 7514477 Low-viscosity radiation-curable composition for making an earpiece

A biocompatible, low-viscosity, radiation-curable composition for producing antimicrobial earpieces contains:a) 20-75 wt. % of one or a plurality of monomeric/oligomeric urethane(meth)acrylates having an acrylate functionality of <4, viscosity <30 Pa s, and molecular weight <3500;b) 5-45 weight % of a monomeric or oligomeric dimethacrylate of bisphenol A or bisphenol F and or of a monomeric aliphatic or cycloaliphatic di(meth)acrylate having a viscosity <6 Pa s;c) 2.5-25 weight % of a cross-linking monomeric or oligomeric component containing 4 methacrylate and/or acrylate functionalities;d) 0-15 wt. % of one or a plurality of monofunctional (meth)acrylates;e) 0.01-5 wt. % of one or a combination of antimicrobially active glass fillers and silver particles; andf) 0.5-6 wt. % of one or a plurality of photoinitiators whose absorption is in the wavelength range of an ND:YVO4 laser beam used or of an actinic radiation source used to promote free radical formation.