| abstract |
The present invention is directed to a substantially dust-free bleach powder that produces an activated bleach composition exhibiting improved thixotropy when mixed with aqueous hydrogen peroxide. The bleach powder contains at least one particulate reducing agent and at least one peroxide salt. Preferably the dust reducing agent present in an amount less than about 10% by weight of the bleach powder is a substantially hydrophilic inert compound selected from alkylated esters, cyclic ethers and cyclic esters. The bleach powder also contains powdered polytetrafluoroethylene (PTFE) in an amount of about 1 to 5 wt% of the bleach powder. The bleach powder also contains an ammonia source, such as ammonium halide, di-ammonium phosphate, ammonium sulfate, and mixtures thereof. Optionally, one or more hair conditioning agents, thickeners and desiccants may be added to the dust-free bleach powder. |