Laundry detergents and laundry treatment compositions comprising one or more dye-transfer-inhibiting dye fixatives

1. A laundry detergent comprising a surfactant and dye-transfer-inhibiting dye fixatives where these dye-transfer-inhibiting dye fixatives are obtained by reacting

a) polyamines with cyanamides and amidosulfuric acid or

b) cyanamides with aldehydes and ammonium salts.

2. The laundry detergent as claimed in claim 1 , further comprising a surfactant selected from the group consisting of anionic surfactants, nonionic surfactants, cationic surfactants, and mixtures thereof.

3. The laundry detergent as claimed in claim 1 , further comprising dye transfer inhibitors selected from the group consisting of polyamine N-oxides, polyvinylpyrrolidone, copolymers of N-vinylpyrrolidone with N-vinylimidazole, and mixtures thereof.

4. The laundry detergent as claimed in claim 2 , wherein said surfactant is a cationic surfactant.

5. The laundry detergent as claimed in claim 1 , further comprising soil release polymers.

6. The laundry detergent as claimed in claim 1 , further comprising cellulases.

7. The laundry detergent as claimed in claim 1 , further comprising bleaches.

8. A method for inhibiting dye transfer in a washing liquor, said method comprising adding to the washing liquor a laundry detergent comprising a surfactant and dye-transfer-inhibiting dye fixative obtained by reacting

a) polyamines with cyanamides and amidosulfuric acid, or

b) cyanamides with aldehydes and ammonium salts.

9. The method of claim 8 , laundry detergent is in a form selected from the group consisting of pulverulent, granular, paste, gel, and liquid.

10. The method of claim 8 wherein the dye-transfer-inhibiting dye fixative ranges from 0.1 to 10 weight percent of the laundry detergent.

11. The laundry detergent as claimed in claim 1 , further comprising inorganic builder, organic builder, or mixtures thereof.