Coated colouring particles of metal oxides and suboxides, and their preparation by flame spray pyrolysis
AssigneeL'oreal
InventorsValérie Jeanne-Rose, Henri Samain, Yiannis Deligiannakis, Maria Louloudi
Life of this patent
Estimating the term…
Abstract
The present invention relates to the use of coated particles of oxide and of suboxide of element M for dyeing and/or making up keratin materials, to a process for the preparation of such coated particles by means of the flame spray pyrolysis technology, to the particles of oxide and of suboxide of element M resulting from such a process, to the coated particles of suboxide of element M and also to the compositions comprising such particles.
Claims27
Use, for the dyeing and/or making up of keratin materials, of at least one particle comprising:
- (i) a core (1) constituted of at least one oxide of element M of formula (I):
- in which:
- M represents an element chosen from the alkali metals of column 1, the alkaline earth metals of column 2 and the elements of columns 3 to 14 of the Periodic Table of the Elements, bismuth, selenium, tellurium and astatine,
- m represents an integer greater than or equal to 1,
- n represents an integer greater than or equal to 1,
- x is equal to 0 or represents a non-integral number greater than 0 and strictly less than n, and
- (ii) an upper coating layer (2), covering the surface of said core (1), constituted of at least one compound of formula (II):
- in which:
- M′ is an element, other than M, chosen from selenium and the elements of columns 4, 13 and 14 of the Periodic Table of the Elements,
- p represents an integer greater than or equal to 1,
- q represents an integer greater than or equal to 0.
Particle comprising:
- (i) a core (1) constituted of at least one suboxide of element M of formula (I′):
- in which:
- M represents an element chosen from the alkali metals of column 1, the alkaline earth metals of column 2 and the elements of columns 3 to 14 of the Periodic Table of the Elements, bismuth, selenium, tellurium and astatine;
- preferably M is chosen from iron, zinc, aluminium, silicon, selenium, sodium, potassium, magnesium and calcium;
- more preferentially from iron, zinc and aluminium;
- and more preferentially still from iron and zinc,
- m represents an integer greater than or equal to 1,
- n represents an integer greater than or equal to 1,
- x represents a non-integral number greater than 0 and strictly less than n, and
- (ii) an upper coating layer (2), covering the surface of said core (1), constituted of at least one compound of formula (II):
- in which:
- M′ is an element, other than M, chosen from selenium and the elements of columns 4, 13 and 14 of the Periodic Table of the Elements;
- preferably, M′ is chosen from selenium, titanium, aluminium and the elements of column 14 of the Periodic Table of the Elements;
- more preferentially from selenium, titanium, aluminium, carbon and silicon;
- more preferentially still from carbon and silicon,
- p represents an integer greater than or equal to 1,
- q represents an integer greater than or equal to 0.
Flame spray pyrolysis device (10) comprising a first chamber (20), a second chamber (30) connected fluidically to the first chamber, and an injection system (40) comprising a first feed (42) emerging in the first chamber (20) and capable of delivering a first composition (A) and a first oxygen-containing gas (G), and a second feed (44) emerging in the first chamber (20) and capable of delivering a mixture (P) comprising oxygen and one or more combustible gases, the first and second feeds (42, 44) being separate from one another, said device (10) comprising a third feed (38) capable of delivering a second composition (B) comprising one or more precursors of element M′ into the second chamber (30), the first and second chambers (20, 30) of said device (10) being isolated from the external air, so that the amount of oxygen present in said first and second chambers (20, 30) is controlled.
Dependencies are inferred from the claim text.