| 摘要 |
Naphthoxazoles characterized by the presence of a carboxylic function at the 9-position are provided. They are improved mass brighteners for molded plastics, particularly polyesters, since they absorb strongly in the UV region of 370-400 nanometers and do not sublime or mark off at high molding temperatures. They correspond to the formula IN WHICH R1 is the hydroxyl radical, or, a monovalent dehydro radical of an alcohol, a phenol, a primary amine or a secondary amine, said monovalent radical containing about 1-8 carbon atoms, and Y is a 2-naphthoxazolyl, or a 2-naphthoxazolylphenyl having a carboxylic acid function at the 9-position, a stilbyl, a 2-benztriazolylphenyl or a 2-naphthtriazolylphenyl radical, or a styryl, 4-cyanostyryl or 4-carboxystyryl radical.
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