Photoprotective compositions and films, and a preparation method
First Claim
1. A photoprotective cosmetic composition including particles having a polymeric multilayer interference structure, at least two layers of said structure comprising an amphiphilic polymer, wherein the particles include a swelling agent, the swelling agent including at least one optically active material, the at least one optically active material being dissolved in the swelling agent and being included within the amphiphilic polymer, wherein the amphiphilic polymer comprises a diblock copolymer with the form A-B where A is polystyrene and B is poly(2-vinyl pyridine), wherein the blocks of the diblock copolymer have the same number average molecular weight, wherein the diblock copolymer has a periodic structure having two separate blocks of A-B alternated at regular intervals, and wherein each block of the diblock copolymer has a number average molecular weight of from 1,000 g/mol to 500,000 g/mol, and wherein the particles having a polymeric multilayer interference structure include a fixing agent selected from inorganic materials, glycols, and PEGs having a number average molecular weight in a range of from 400 g/mol to 50,000 g/mol.
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Abstract
A photoprotective composition, in particular a cosmetic composition, that includes particles of photonic material having a polymeric multilayer interference structure, where at least two layers of the structure contain an amphiphilic polymer.
24 Citations
11 Claims
- 1. A photoprotective cosmetic composition including particles having a polymeric multilayer interference structure, at least two layers of said structure comprising an amphiphilic polymer, wherein the particles include a swelling agent, the swelling agent including at least one optically active material, the at least one optically active material being dissolved in the swelling agent and being included within the amphiphilic polymer, wherein the amphiphilic polymer comprises a diblock copolymer with the form A-B where A is polystyrene and B is poly(2-vinyl pyridine), wherein the blocks of the diblock copolymer have the same number average molecular weight, wherein the diblock copolymer has a periodic structure having two separate blocks of A-B alternated at regular intervals, and wherein each block of the diblock copolymer has a number average molecular weight of from 1,000 g/mol to 500,000 g/mol, and wherein the particles having a polymeric multilayer interference structure include a fixing agent selected from inorganic materials, glycols, and PEGs having a number average molecular weight in a range of from 400 g/mol to 50,000 g/mol.
- 3. A photoprotective cosmetic composition including particles having a polymeric multilayer interference structure, at least two layers of said structure comprising an amphiphilic polymer, the photoprotective cosmetic composition comprising a fatty phase and an aqueous phase, the aqueous phase including the particles having a polymeric multilayer interference structure, wherein the amphiphilic polymer comprises a diblock copolymer with the form A-B where A is polystyrene and B is poly(2-vinyl pyridine), wherein the blocks of the diblock copolymer have the same number average molecular weight, wherein the diblock copolymer has a periodic structure having two separate blocks of A-B alternated at regular intervals, and wherein each block of the diblock copolymer has an average molecular weight of from 1,000 g/mol to 500,000 g/mol, and wherein the particles having a polymeric multilayer interference structure include a fixing agent selected from inorganic materials, glycols, and PEGs having a number average molecular weight in a range of from 400 g/mol to 50,000 g/mol.
Specification