| 摘要 |
The invention relates to urea derivatives according to formula (I) in which: radicals R<SUP>1</SUP>, R<SUP>2</SUP>, R<SUP>3</SUP> and R<SUP>4, </SUP>independent of one another, represent a hydrogen atom, a C<SUB>1</SUB>- to C<SUB>4</SUB> alkyl group, a C<SUB>2</SUB>- to C<SUB>6</SUB> alkenyl group or a C<SUB>2</SUB>- to C<SUB>6</SUB> hydroxyalkyl group with at least one hydroxy group, with the provision that at least one of said radicals represents a C<SUB>2</SUB>- to C<SUB>6</SUB> hydroxyalkyl group with at least one hydroxy group. These urea derivatives are suited for increasing the volume of keratin fibers, particularly human hair. The increase in volume can be achieved, in fact, during an oxidative treatment, e.g. during oxidative coloring or bleaching.
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