Process for producing optical molding materials

US11427664B2 · 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: Aug 20, 2018
• Grant date: Aug 30, 2022
• Expiry date: Jul 28, 2039

Classification

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

Abstract

A process is useful for producing optical molding materials on the basis of methyl methacrylate (MMA), wherein this MMA has been 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. In particular, an optimized workup of the reactor output from the oxidative esterification of methacrolein is useful for removing particularly discoloring byproducts. This process moreover has the advantage that fewer demands than described in related art are placed on plant apparatus configuration.