Polymeric UV absorbers of the 2-hydroxybenzophenone type. II. On the mechanism of the polymerization of 2-hydroxy-4-(2,3-epoxypropoxy) benzophenone with phthalic anhydride

✍ Scribed by J. Lustoň; N. Schubertová; Z. Maňásek

• Book ID: 105340888
• Publisher: Wiley (John Wiley & Sons)
• Year: 2007
• Weight: 438 KB
• Volume: 40
• Category: Article
• ISSN: 0360-8905
• DOI: 10.1002/polc.5070400106

✦ Synopsis

Abstract

Simultaneously with the preparation of 2‐hydroxybenzophenone light stabilizers with a reduced extractability from polypropylene, the mechanism of the propagation reaction of 2‐hydroxy‐4‐(2,3‐epoxypropoxy) benzophenone with phthalic anhydride was studied under different concentrations and temperature conditions, with tert‐amines, potassium benzoate, and potassium hydroxide being used as catalysts. If the polymerization of epoxide with anhydride is performed in melt at 125°C, an alternating copolymer is formed whether an equimolar ratio or a molar excess of anhydride with respect to epoxide has been used. Provided epoxide is present in molar excess with respect to anhydride in the reaction system, some changes in ultraviolet absorption spectra are observed in comparison with the spectra of alternating copolymers which indicate that some undesirable reactions of the orthophenolic groups of benzophenone occur simultaneously with the catalyzed polyaddition reaction, and that the polymeric stabilizer is impaired.