A NEW ULTRAVIOLET PROTECTIVE AGENT OF THE INTERCALATION COMPOUND OF AMINOBENZOIC ACID-ESTERS (UV ABSORBER) AND SYNTHETIC MICA (INORGANIC LAYERED COMPOUND)

The interaction between a sodium-type synthetic mica (Na-TSM), a mater ial of reactive layered compounds which exhibit characteristic light s cattering, and some aminobenzoic acid derivatives which act as UV abso rbing agents (UV absorber), was investigated, Due to the observed elon gation of interlayer spacing (increase in the d-value) by X-ray diffra ction analysis, it was found that the powdered form of 4-aminobenzoic acid ethyl ester (4-ABE) interacts with Na-TSM, and can be immobilized in the interlayer space of Na-TSM, Consequently, an intercalation com pound of 4-ABE and Na-TSM was obtained, The formation of the intercala tion compound of 4-ABE and Na-TSM was accelerated by heat processing, particularly at temperatures exceeding the melting point of 4-ABE, Whe n 2-aminobenzoic acid methyl ester (2-ABM) in liquid form at room temp erature was used instead of 4-ABE, the intercalation compound of 2-ABM and Na-TSM was formed in a similar manner to that of 4-ABE and Na-TSM , The heat processing again accelerated the formation of the intercala tion compound of 2-ABM and Na-TSM, Interestingly, a difference in the formation behavior of intercalation compounds between 4-ABE and 2-ABM was observed, The intercalation compound of Na-TSM and 4-ABE or 2-ABM showed efficient UV absorption in the UVB and UVA wavelength regions, Therefore, application of a layered compound of Na-TSM and 4-ABE or 2- ABM as a novel UV screening system is promising.