Method of producing ultraviolet radiation absorbent

Details Method of producing ultraviolet radiation absorbent Method of producing ultraviolet radiation absorbent

2005-06-21

2005-06-21

Wilson, James O. (Department: 1624)

Organic compounds -- part of the class 532-570 series

Organic compounds

Chalcogen in the nitrogen containing substituent

C544S089000

Reexamination Certificate

active

06908998

ABSTRACT:
An ultraviolet radiation absorbent is produced by a method including specified Step A, Step B and Step C. Step A is a process of causing an amidation of anthranilic acid and terephthaloyl dichloride in the presence of a solvent and an alkali to generate N,N′-bis(o-carboxyphenylterephthalamid) and separating a solid component containing N,N′-bis(o-carboxyphenylterephthalamid) generated by this amidation. Step B is a process of separating a solid component containing cyclic imino ester compound of a specified kind. Step C is a process of processing the solid component separated in Step B with an alkaline solution and further washing with water to obtain the ultraviolet radiation absorbent for thermoplastic polymers containing cyclic imino ester compound of the specified kind.

REFERENCES:
patent: 61-291575 (1986-12-01), None
patent: 2000-264879 (2000-09-01), None
Hamad et al, “Synthesis and reactions of 2,2′-(1,4-phenylene)-di-4H-benz-3,1-oxazin-4-one” Afinidad, vol. 55(475), pp. 225-228 (1998). CAS Online Abstract.
Bain and Smalley, “Synthesis of 2-Substituted-4H-3,1-benzoxazin-4-ones” J. Chem. Soc., Section C: Organic, vol. 13, pp. 1593-1597 (1968).

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