Gent for dyeing hair, containing at least one organic silicon compound i

A composition for dyeing keratinous material, especially human hair, comprising in a cosmetic carrier

• (a) at least one organic silicon compound obtainable by partial condensation under reduced pressure of at least one amino silane (a1) of the formula (I),
• R1R2N-L-Si(OR3)a(R4)3-a (I),
• wherein
• R1, R2 independently represent a hydrogen atom, a C1-C6 alkyl group, a hydroxy-C1-C6 alkyl group, a C2-C6 alkenyl group, an amino-C1-C6 alkyl group, an amino-C1-C6 alkyl-amino-C1-C6 alkyl group or a group of formula (III),
• -(L′)c-Si(R6)b(OR5)3-b (III),
• wherein
• L and L′ each independently represent a linear or branched C1-C20 divalent alkylene group,
• R3 and R5 independently represent a hydrogen atom or a C1-C6 alkyl group,
• R4 and R6 independently represent a C1-C6 alkyl or a C2-C6 alkenyl group,
• a and b each independently represent an integer from 2 to 3, and
• c is 0 or 1;
• and optionally at least one second silane (a2) of formula (II)
• R7—Si(OR8)d(R9)3-d (II),
• wherein
• R7 represents a linear or branched C1-C12 alkyl group, hydroxy-C1-C12 alkyl group or C2-C12 alkenyl group,
• R8 represents a hydrogen atom or a C1-C6 alkyl group,
• R9— is a C1-C6 alkyl or a C2-C6 alkenyl group,
• d is an integer from 2 to 3;
• and
• (b) at least one colorant compound.