Societe Anonyme Dite: L'oreal

L'oreal

Claudine Lapoiriere

Christos Papantoniou

Claude Mahieu

Jean-Claude H Ser

Beatrice DeFrossez

Rose-Marie Handjani-Vila

A one-step process for preparing cross-linked poly-.beta.-alanine as microspheres having narrow size distribution comprises polymerizing acrylamide with a polyfunctional compound copolymerizable with acrylamide (with the polyfunctional compound also acting as the cross-linking agent) in an organic solvent or a mixtured such solvents in the presence of an ionic polymerization initiator and a suspension agent. The resulting microspheres may be impregnated with a pharmaceutically or cosmetically active substance.

One step process for preparing cross-linked poly-.beta.-alanine

An anhydrous cosmetic makeup composition for the lips and skin contains crosslinked poly .beta.-alanine microspheres impregnated with a polyhydric alcohol.

Cosmetic makeup compositions containing crosslinked poly .beta.-alanine

A process for preparing crosslinked poly .beta.-alanine in the form of microspheres comprises (a) polymerizing acrylamide in a tert. butanol/toluene solvent mixture in the presence of a polymerization initiator and an octadecene-maleic anhydride copolymer as a suspension agent; (b) submitting the resulting suspension of poly .beta.-alanine to a crosslinking reaction using a dialdehyde as the crosslinking agent; and (c) isolating the crosslinked poly .beta.-alanine microspheres. These microspheres exhibit a low size dispersity.

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Le Perreux, France

Claudine Lapoiriere