Process for producing optical molding materials

US11780944B2 · kind B2 · utility

Assignee

• Röhm GmbH · DE

Inventors

• Steffen Krill · Mühltal, DE
• Belaid Ait Aissa · Darmstadt, DE
• Florian Zschunke · Frankfurt, DE
• Gerhard Kölbl · Gernsheim, DE
• Rüdiger Carloff · Darmstadt, DE

Key dates

• Filing date: Jul 22, 2022
• Grant date: Oct 10, 2023
• Expiry date: Jul 22, 2042

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C69/54
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process can be used for producing optical molding materials on the basis of methyl methacrylate (MMA). The MMA produced by an optimized method and the molding materials feature in particular a very low yellowness index. This MMA has been produced by direct oxidative esterification of methacrolein. An optimized workup of the reactor output from the oxidative esterification of methacrolein can be used for removing particularly discoloring byproducts. This process moreover has the advantage that fewer demands are placed on plant apparatus configuration.