UV light stabilizer based on benzophenone

US4824892A · kind A · utility

Assignee

• Riedel-De Haen Aktiengesellschaft · DE

Inventors

• Kurt Eiglmeier · Neustadt, DE
• Joachim Schulz · Stuttgart, DE

Key dates

• Filing date: Dec 15, 1987
• Grant date: Apr 25, 1989
• Expiry date: Dec 15, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C69/533
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Benzophenone derivatives having at least one hydroxyl group in the ortho-position relative to the carbonyl group are used for stabilizing numerous substrates against the action of UV light. 1,3-bis-(4-Benzoyl-3-hydroxyphenoxy)-2-propanol is a photo-absorber containing two benzophenone groups. Particularly suitable stabilizers are esters of this substituted propanol with unsaturated carboxylic acids, for example esters of acrylic acid and methacrylic acid. These compounds are prepared by esterifying the substituted propanol with an unsaturated acid or by esterifying the substituted propanol with a saturated acid containing a reactive methylene group and subjecting the product to subsequent condensation with a keto compound. They can be polymerized and are suitable for the preparation of homopolymers and copolymers.