Wella Patents Odor Reduction in Hair Color Treatment

US Patent No 11,696,877 B2 (Moussa Barhoum, Pascale Smets, Frank Veverka, Manfred Schmitt, Ingrid Merere, Christine Marie Cahen); Wella Operations US, Calabasas, CA, has patented a hair coloring and/or bleaching composition that is comprised of a first aqueous component comprising one or more oxidizing agents in a cosmetically acceptable carrier; and a second aqueous component comprising one or more alkalizing agents comprising ammonia, its salts or mixtures thereof, in a cosmetically acceptable carrier.

The aqueous components are mixed in a ratio ranging from 5:1 to 1:5.

The total composition, after mixing the first and the second aqueous components, comprise:
a) a linear and/or branched C12 to C30 fatty alcohol at from 0.5% to 20% relative to the total composition after mixing,
b) one or more polyoxyethylene C12-C30 alkyl ether nonionic surfactants at from 0.1% to 5% relative to the total composition after mixing,
c) a phosphate ester compound selected from the group consisting of alkyl phosphate ester, alkoxylated alkyl phosphate esters, and mixtures thereof at from 0.3% to 8% relative to the total composition after mixing;
d) an anionic surfactant other than the phosphate ester at from about 1% or less relative to the total composition after mixing; and
e) optionally at least one oxidative dye precursor and at least one coupler or a mixture of two or more thereof.

The first aqueous component or the second aqueous component, or both, comprise a gel-network system consisting of multi-lamellar sheets or vesicles or both, with d-spacing between 5 nm and 50 nm as measured by small angle x-ray scattering. Additionally, the first aqueous component or the second aqueous component, or both, contain a malodor suppressant consisting of isopropyl myristate.