Low-viscous, radiation curable formulation, particularly for the stereo-lithographical production of earpiece

US7232646B2 · kind B2 · utility

Assignee

• Dreve-Otoplastik GmbH · DE

Inventors

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

Key dates

• Filing date: Jun 17, 2004
• Grant date: Jun 19, 2007
• Expiry date: Jun 17, 2024

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S430/118
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a biocompatible, low-viscous, radiation curable formulation, particularly for use in stereolithography, for use in medical technology, in particular, for producing earpieces, containing: a) 55-95% by weight of a monomeric or oligomeric dimethacrylate based on bisphenol A or bisphenol F; b) 0-20% by weight of a urethane methacrylate having a functionality of n<4 and a viscosity<15 Pa s; c) 2-15% by weight of a monomeric aliphatic or cycloaliphatic dimethacrylate having a viscosity<5 Pa s; d) 0-15% by weight of a monofunctional methacrylate having a viscosity<3 Pa s; e) 0.5-6% by weight of a photoinitiator or a combination of a number of photoinitiators whose absorption is located within the wavelength range of the laser beam used; f) 0.0001-2% by weight of the inhibitor 2,2,6,6-tetramethylpiperidin-1-yloxy (free radical), also in conjunction with known inhibitors; g) 0-40% by weight of fillers; h) 0-5% by weight of coloring pigments; i) 0-5% by weight of remaining additives such as UV stabilizers or spreading additives, whereby the proportions of constituents a) to h) total 100% by weight.