Patent ID: 7763669
Filing Date: 2010-07-27
Classification: B33Y,C08G,C08L,G03F,H04R

Abstract:
1. A biocompatible, radiation-curable formulation having a viscosity <2000 mPa·s for the production of earpieces, using PNP or by stereolithographic processes, containing: a) 20-50% by weight of an (n)-ethoxylated bisphenol A dimethacrylate having an ethoxylation rate of n<10, or a mixture of (n)-ethoxylated bisphenol A dimethacrylates having an ethoxylation rate of n<10; b) 5-45% by weight of one or more aliphatic or cycloaliphatic monomeric/oligomeric urethane (meth)acrylates having a functionality of n<4, a viscosity <15 Pa·s, and a molecular weight <2000; c) 3-10% by weight of a monomeric aliphatic or cycloaliphatic dimethacrylate having a viscosity <3 Pa·s; d) 3-25% by weight of the asymmetric iminooxadiazonedione compound of the Formula (I) wherein R 1 , R 2 and R 3 are each C 1 to C 16 alkyl, cycloalkyl, or C 1 to C 16 alkyl-cycloalkyl, wherein each of the groups R 1 , R 2 and R 3 is functionalized with methacrylate or acrylate functional groups; e) 2-15% by weight of one or more monofunctional methacrylates having a viscosity <3 Pa·s; f) 1-4% by weight of one photoinitiator or a combination of several photoinitiators whose absorption lies in the wavelength range of the laser beam or irradiation source used wherein the photoinitiator or combination of photoinitiators is selected from the group consisting of bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, and mixtures thereof; g) an effective amount up to 0.5% by weight of one anaerobic inhibitor or a combination of anaerobic inhibitors, selected from the group consisting of phenothiazine, DPPH and mixtures thereof; h) 0-20% by weight fillers having a particle size <80 nm; i) 0-5% by weight dyes; j) 0.01-3% by weight of customary additives such as UV stabilizers or process additives, the sum of the fraction of components a) through j) equaling 100% by weight.