Low-viscosity, radiation-curable formulation for producing adaptive earpieces

US7763669B2 · kind B2 · utility

Assignee

• Dreve-Otoplastik GmbH · DE

Inventors

• Martin Klare · Dortmund, DE
• Reiner Altman · Castrop-Rauxel, DE
• Michael Kutschinski · Castrop-Rauxel, DE
• Thomas Veit · Munster, DE

Key dates

• Filing date: Oct 13, 2005
• Grant date: Jul 27, 2010
• Expiry date: May 22, 2026

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04R25/652
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to a biocompatible, low-viscosity, radiation-curable formulation for producing medical products, in particular adaptive ear pieces, otoplastic parts, shells or ear parts, by means of PNP methods or stereolithographic methods. Said formulation comprises: a) 15-60 wt. % of a monomeric or oligomeric dimethacrylate based on bisphenol A or bisphenol F; b) 0-50 wt. % one or more monomeric or oligomeric urethane (meth)acrylates with a functionality n<4, a viscosity <30 Pa s and a molecular weight <3500; c) 2-25 wt. % of a monomeric, aliphatic or cycloaliphatic dimethacrylate with a viscosity <3 Pa s; d) 2-35 wt. % of an iminooxadiazone dion derivative, characterised by 3 methacrylate and/or acrylate functions; 0-15 wt. % one or more monofunctional methacrylates; f) 0.5-6 wt. % of a photo initiator or a combination of photo initiators, whose absorption lies in the wavelength range of the laser beam that is used or the irradiation source; g) 0-0.5 wt. % one or more anaerobic inhibitors; h) 0-40 wt. % fillers with a particle size <25 μm; i) 0-5 wt. % colorants; j) 0-5 wt. % conventional additives such as UV stabilisers or process additives, whereby the sum of the fracti…