Dye compositions comprising at least one nonionic compound and uses thereof

A process for dyeing keratin fibers, comprising applying on said keratin fibers:

• at least one composition (A) comprising, in a medium appropriate for dyeing, at least one colorant chosen from oxidation dyes and direct dyes,
• at least one oxidizing composition (B), which aids development of said dyeing process at alkaline, neutral or acid pH,
• wherein said at least one oxidizing composition (B) is mixed just at the moment of use with said at least one composition (A) or said at least one oxidizing composition (B) is applied sequentially to said at least one composition (A) without intermediate rinsing, and
• at least one nonionic compound of the formula R—(OCH2CH2)n—OR′, wherein R is chosen from C10-C30 alkyl groups, and wherein R′ is chosen from C10-C30 alkyl groups optionally substituted with a hydroxyl group, and n is an integer ranging from 1 to 100, wherein said at least one nonionic compound is present in said at least one composition (A), in said at least one composition (B), or in said at least one composition (A) and said at least one composition (B).

A process comprising applying on keratin fibers at least one dyeing composition, leaving said composition on said keratin fibers for a time ranging from 1 to 60 minutes approximately, rinsing said keratin fibers, optionally shampooing said keratin fibers, rinsing said keratin fibers after said optional shampooing, and drying said keratin fibers, wherein said at least one dyeing composition comprises:

• at least one composition (A′) comprising at least one colorant chosen from oxidation dyes and direct dyes,
• at least one composition (A″) comprising at least one nonionic compound of the formula R—(OCH2CH2)n—OR′, wherein R is chosen from C10-C30 alkyl groups, and wherein R′ is chosen from C10-C30 alkyl groups optionally substituted with a hydroxyl group, and n is an integer ranging from 1 to 100,
• at least one oxidizing composition (B)
• wherein said at least one dyeing composition comprising said at least one composition (A′), said at least one composition (A″) and said at least one composition (B) is prepared by mixing said at least one compositions (A′), (A″), and (B) at the moment of use.

A device for dyeing keratin fibers comprising 3 compartments wherein:

• a first compartment comprises at least one composition A2 comprising, in a medium appropriate for dyeing, at least one colorant chosen from oxidation dyes and direct dyes,
• a second compartment comprises at least one composition B2 comprising, in a medium appropriate for dyeing, at least one oxidizing agent,
• a third compartment comprises at least one composition C comprising, in a medium appropriate for dyeing, at least one nonionic compound of the formula R—(OCH2CH2)n—OR′, wherein R is chosen from C10-C30 alkyl groups, and wherein R′ is chosen from C10-C30 alkyl groups optionally substituted with a hydroxyl group, and wherein n is an integer ranging from 1 to 100, and wherein
• said at least one composition A2, said at least one composition B2, and said at least one composition A2 and said at least one composition B2 can also further comprise said at least one nonionic compound.