Polythiourethane-based casting resin having high fracture resistance and low specific weight

US9994667B2 · kind B2 · utility

Assignee

• Bruno Bock Chemische Fabrik GmbH and Co. KG · DE

Inventors

• Elvira Schlatter · Geesthacht, DE
• Detlef Schmidt · Malibu, US
• Matthias REHFELD · Geesthacht, DE
• Frank Ebmeyer · Hattersheim, DE

Key dates

• Filing date: Apr 24, 2014
• Grant date: Jun 12, 2018
• Expiry date: Apr 24, 2034

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B1/041
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention has as subject matter a method for producing a polyurethane cast resin, wherein the production comprises the steps of mixing at least one thiol component with at least one isocyanate component, degassing of the mixture and hardening of the polyurethane polymer in a one-stage process. Cast resins for electronic or optoelectronic components of for the production of optical lenses are obtained by the method of the invention that have good mechanical properties and very good optical properties at the same time by a suitable combination of polythiols as hardening component with commercially available isocyanates. The addition of special isocyanates is also not very necessary, as is the case for carrying out the method in several stages. The method in accordance with the invention results in an economical, one-stage process in the properties of the cast resin that are necessary for the application range.