ABSTRACT
Introduction 292
Trends in the Sunscreen Market 292
Objectives-Requirements 293
Efficacy 293
Safety 293
Registration 294
Patent Freedom 294
New Trends in the Development of UV Absorbers for Sunscreens 295
New Developments with Respect to Conventional UV Absorbers 296
New Product Forms 296
Case Study 1: Dispersions of Particulate Organic UV Absorbers 297
Photostability of MBBT 297
Synthesis of New Molecules 300
Case Study 2: BEMT-A New Filter Designed for
Application in Sunscreens 300
Overview of New Sunscreen Actives 302
The Most Important Properties of UV Absorbers for Sunscreens 302
UV-Spectroscopic Performance 302
Solubility 302
Photostability 303
Discussion of the New UV Filters for Sunscreens 303
UV-B Filters 303
UV-A Filters 306
UV Broad-Spectrum Filters 309
Improved UV-A Protection with New UV-A and
Broad-Spectrum UV Absorbers 312
Safety of the New UV Absorbers 315
Conclusions 317
References 317
INTRODUCTION
Sunscreens should protect not only against sunburn, which is mainly caused by
UV-B radiation, but also against the damaging effects of the more deeply pene-
trating UV-A radiation (1). This new expectation from consumers and the
medical community has triggered the development of new UV absorbers and
led to the approval of seven new, organic UV absorbers in Europe over the
last decade (2). The US Food and Drug Administration has approved none of
them so far. In this chapter, the new development of UV filters will be presented
and the significant progress over the last few years, mainly in UV-A protection
will be discussed.
