L’Oreal has filed a patent for a developer composition used in hair coloring. The composition includes direct dyes with halogenated aromatic groups, oxidizing agents, and water, with a pH range of 1 to 4. The patent also covers methods for making and using the composition. GlobalData’s report on L’Oreal gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData’s company profile on L'Oreal, Nanoemulsion cosmetics was a key innovation area identified from patents. L'Oreal's grant share as of September 2023 was 61%. Grant share is based on the ratio of number of grants to total number of patents.

A recently filed patent (Publication Number: US20230310285A1) describes a developer composition for coloring hair. The composition includes one or more direct dyes with halogenated aromatic rings, oxidizing agents, and water. The pH of the composition ranges from 1 to 4. The weight percentages of the components are based on the total weight of the composition.

The patent claims that the direct dyes used in the composition can be chosen from triarylmethane dyes, xanthene dyes, azo dyes, and mixtures thereof. Specific examples of xanthene dyes mentioned include D&C Red 28, Erythrosine B, Eosin Y, and Eosin B. Triarylmethane dyes mentioned include tetrabromophenol blue, 3,4,5,6-tribromophenol sulfone phthalein, sulfobromophthalein, bromocresol green, and bromothymol blue. Azo dyes mentioned include Acid Red 337, Disperse Red 167, Basic Red 18, and Disperse Red 118.

The oxidizing agents used in the composition can be hydrogen peroxide, inorganic alkali metal peroxides, organic peroxides, inorganic perhydrate salts, bromates, or a mixture thereof. Hydrogen peroxide is specifically mentioned as an example.

The composition may also include fatty alcohols, nonionic surfactants, water-soluble organic solvents, and miscellaneous ingredients such as fragrances, preservatives, chelating agents, pH adjusters, buffering agents, and botanical extracts.

The patent also describes a method for coloring hair using the developer composition. The method involves mixing the developer composition with a hair coloring base composition containing oxidative dye precursors, applying the mixture to the hair, allowing it to remain on the hair for a period of time, and then rinsing it off.

Additionally, a kit is mentioned in the patent, which includes the developer composition and a hair coloring base composition. The two compositions are separately contained in the kit.

Overall, this patent describes a developer composition for hair coloring that includes specific direct dyes, oxidizing agents, and other optional ingredients. The composition can be used in a method for coloring hair and is available as part of a kit along with a hair coloring base composition.

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GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.

GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.