Powdery emulsifying composition of alkyl polyglycosides, use thereof for preparing cosmetic emulsions, and method for preparing same

A method for preparing an oil-in-water cosmetic emulsion by emulsification of a fatty phase P1 with an aqueous phase P2, comprising at least one step a) of preparing said fatty phase P1 which comprises mixing at least one or more oils and/or one or more waxes, with an effective amount of a pulverulent composition C1,

• wherein pulverulent composition C1 comprises, for 100% of its weight:
• from 5% by weight to 70% by weight, of at least one compound of formula (I):
• R—O-(G)x-H (I)
• in which the R radical represents a saturated linear aliphatic radical containing from 12 to 22 carbon atoms, G represents the residue of a reducing sugar selected from the group consisting of glucose, xylose and arabinose, and x represents a decimal number greater than or equal to 1 and less than or equal to 10;
• and
• from 95% by weight to 30% by weight, of one or more alcohols of formula (II):
• R′—OH (II)
• in which the R′ radical, which may be identical to or different than the R radical as defined above, represents a saturated linear aliphatic radical containing from 12 to 22 carbon atoms, and in which at least 90% by volume of particles have a diameter of less than or equal to 250 micrometers
• wherein the pulverulent composition C1 comprises a non-zero proportion by weight of at least one compound of formula (Ia), corresponding to formula (I) as defined above in which R represents a saturated linear aliphatic radical containing from 20 to 22 carbon atoms, and a non-zero proportion by weight of at least one alcohol of formula (IIa), corresponding to formula (II) as defined above in which R′ represents a saturated linear aliphatic radical containing from 20 to 22 carbon atoms
• wherein further the pulverulent composition C1 comprises, for 100% of its weight:
• from 5% by weight to 20% by weight of at least one compound of formula (Ia);
• from 1.5% by weight to 10% by weight of at least one compound of formula (Ib) corresponding to formula (I) as defined above, in which R represents a saturated linear aliphatic radical containing from 12 to 14 carbon atoms;
• from 1% by weight to 10% by weight of at least one compound of formula (Ic) corresponding to formula (I) as defined above, in which R represents a saturated linear aliphatic radical containing from 16 to 18 carbon atoms;
• from 45% by weight to 80% by weight of at least one compound of formula (IIa);
• from 5% by weight to 10% by weight of at least one compound of formula (IIb) corresponding to formula (II) as defined above, in which R′ represents a saturated linear aliphatic radical containing from 12 to 14 carbon atoms;
• and
• from 0% by weight to 10% by weight of at least one compound of formula (IIc) corresponding to formula (II) as defined above, in which R′ represents a saturated linear aliphatic radical containing from 16 to 18 carbon atoms.