LIGHTENING AND/OR COLOURING AGENT COMPRISING CYCLIC UREA DERIVATIVES

摘要

The invention relates to urea and/or thiourea and/or guanidine derivatives of formula (I), wherein X represents =0 or =S or =N-R⁵ and R¹, R², R³, R⁴, R⁵ represent, independently from one another, a hydrogen atom, an optionally substituted aryl group or an optionally substituted (C₁-C₂₄)-alkyl group, or an optionally substituted (C₁-C₂₄)-alkylene group, wherein at least one of the following conditions a) to d) is met: a) at least one of the radicals R¹ - R⁴ forms a ring and/or b) the radicals R¹ and R² form a ring together and/or c) the radicals R³ and R⁴ form a ring together and/or d) the radicals R² and R⁴ 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.