Use of bismuth oxycarbonate particles for filtering ultraviolet radiation

Use according to any one of the preceding claims, said bismuth oxycarbonate particles being of formula (BiO)2(CO3).

Use according to any one of the preceding claims, the greatest mean dimension of said particles being less than or equal to 300 nm.

Use according to any one of the preceding claims, said particles being in the form of tubes, platelets and/or rods.

Use according to any one of the preceding claims, said particles being predominantly or exclusively in the form of platelets and having a mean length L ranging from 15 to 300 nm, in particular ranging from 30 to 250 nm;

• a mean width l ranging from 10 to 250 nm, in particular ranging from 20 to 200 nm, and a mean thickness e ranging from 2 to 120 nm, in particular ranging from 5 to 100 nm;
• and with e<l<L.

Use according to any one of the preceding claims, said particles being doped, in particular with cations derived from elements selected from titanium, vanadium, manganese, iron, copper, zinc, lanthanum and/or cerium, more preferentially from manganese, iron and/or cerium, and even more preferentially from manganese or iron;

• and/or with anions selected from S2−, SO32−, SO42−, Cl− and/or I−, preferably from SO32−, SO42− and/or Cl−, and more preferentially from Cl− or SO42−.

Composition according to the preceding claim, comprising from 0.5% to 40% by weight of bismuth oxycarbonate particles, preferably from 1% to 30% by weight, even better still from 2 to 20% by weight, relative to the total weight of the composition.

Non-therapeutic cosmetic process for filtering UV radiation, in particular UVB radiation, comprising at least the application, to the keratin materials, of a cosmetic composition comprising bismuth oxycarbonate particles having the empirical formula (BiO)2-x(CO3), wherein

• −0.4<x<0.6, the greatest mean dimension of said particles being less than 400 nm.