Sunscreen composite particles and porous particles in cosmetic compostions
A cosmetic composition is provided which includes composite particles of a sunscreen agent and a condensation polymerized polyamide binder, a water-insoluble powdered polymer of porous particles having an Oil Absorbance (castor oil) Value ranging from about 90 to about 500 ml/100 gm, and a cosmetically acceptable carrier. The composition exhibits an excellent soft focus property to hide skin imperfections, and retains relatively high SPF photoprotection.
1. A cosmetic composition comprising:
(i) from about 0.1 to about 20% by weight of composite particles formed of an organic sunscreen agent and a condensation polymerized polyamide which is a polyalkyleneoxypolyamide resin in a relative weight ratio of about 5:1 to about 1:10;
(ii) from about 0.01 to about 10% by weight of water-insoluble powdered polymer formed as porous particles having an Oil Absorbance (castor oil) value ranging from about 90 to about 500 ml/100 gm; and
(iii) a cosmetically acceptable carrier;
wherein the composition has a Transmission Intensity Value as follows:
at a Transmission Angle of 0° ranging from 4.0 to 7.0 million W-nm/cm 2 ;
at a Transmission Angle of 10° ranging from 1.0 to 2.0 million W-nm/cm 2 ;
at a Transmission Angle of 30° ranging from 120 to 140 thousand W-nm/cm 2 ;
at a Transmission Angle of 40° ranging from 60 to 80 thousand W-nm/cm 2 ; and
at a Transmission Angle of 50° ranging from 40 to 60 thousand W-nm/cm 2 .
2. The composition according to claim 1 wherein sunscreen agent and polyamide are intimately mixed together to form each of the composite particles.
3. The composition according to claim 1 wherein the composite particles have an average particle size ranging from about 10 to about 2,000 nm.
4. The composition according to claim 1 wherein the composite particles have an average particle size ranging from about 100 to about 1,500 nm.
5. The composition according to claim 1 wherein the sunscreen agent is octylmethoxycinnamate, Benzophenone-3 and mixtures thereof.
6. A composition according to claim 1 wherein the porous particles are polymethyl methacrylate.
7. A composition according to claim 1 wherein the particles are cross-linked.
8. The composition according to claim 1 wherein the composite particles have an average particle size ranging from about 200 to about 1000 nm.
9. The composition according to claim 1 wherein the relative weight ratio of organic sunscreen agent to condensation polymerized polyamide ranges from about 1:1 to about 1:3.