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This L'Oréal formula contains as much as 30% by weight of carbon black.
May 30, 2025
By: TOM BRANNA
Editor
US 12,296,039 B2. Akito Hoshino, Kanagawa, Japan. Assignee: L’Oréal, Paris.
A L’Oréal researcher patented a composition with long-lasting concealing effects. The composition includes:
(a) carbon black, in an amount of 1% to 30% by weight, relative to the total weight of the composition;
(b) at least one first copolymer selected from the group consisting of acrylates copolymer, ammonium acrylates copolymer, and a mixture thereof, in an amount of 0.001% to 30% by weight, relative to the total weight of the composition; and
(c) a second copolymer being styrene/acrylates/ammonium methacrylate copolymer, in an amount of 1% to 40% by weight, relative to the total weight of the composition,
wherein
• the composition is in a form of a liquid,
• the weight ratio of the amount of the (c) second copolymer/the amount of the (a) carbon black is in a range of 2.0 to 3.0, and
• the composition comprises no nonionic surfactant.
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