摘要 |
<p>The invention relates to urea and/or thiourea and/or guanidine derivatives of formula (I), wherein X represents =0 or =S or =N-R<SUP>5</SUP> and R<SUP>1</SUP>, R<SUP>2</SUP>, R<SUP>3</SUP>, R<SUP>4</SUP>, R<SUP>5</SUP> represent, independently from one another, a hydrogen atom, an optionally substituted aryl group or an optionally substituted (C<SUB>1</SUB>-C<SUB>24</SUB>)-alkyl group, or an optionally substituted (C<SUB>1</SUB>-C<SUB>24</SUB>)-alkylene group, wherein at least one of the following conditions a) to d) is met: a) at least one of the radicals R<SUP>1</SUP> - R<SUP>4</SUP> forms a ring and/or b) the radicals R<SUP>1</SUP> and R<SUP>2</SUP> form a ring together and/or c) the radicals R<SUP>3</SUP> and R<SUP>4</SUP> form a ring together and/or d) the radicals R<SUP>2 </SUP>and R<SUP>4 </SUP>form a ring together, under the proviso that if b) and c) are simultaneously met, both rings are not simultaneously hetrocyclic rings having two dual compounds, additional nitrogen atoms and an identical structure. Said derivatives are particularly suitable for improving the lightening effects of blonding agents and/or lightening colouring agents.</p> |