US 10,246,552 B1 · Photostabilizing polymer

Abstract

The present invention is directed to a series of polymers containing end groups that are absorb ultraviolet (UV) light. The invention is also to the use of such compounds in the cosmetic, toiletry and personal care areas. These polymers can be utilized to produce films and provide solvent properties for the formulation of for ultra-violet absorbing formulations (like sunscreens) and provide outstanding dispensability and anti-agglomeration properties for inorganic sunscreens containing ZnO and TiO2. The ability to provide uniform non agglomerating sun care formulations results in formulations with increase SPF values and improved “water-resistant” properties in cosmetic formulation. The compounds of the present invention by themselves do not have ultra violet absorption at the particular wavelength that contributes to sun protection and consequently are not themselves sunscreens.

Claims19

Dependent claims

A photostabilizing polymer prepared by the esterification reaction of:

1. a photo-absorbing group having the following structure:
wherein;
x is an integer ranging from 1 to 10;
2. a diacid independently selected from the group consisting of:
a. a fatty acid having to the following structure:
HOOC—R3—COOH
wherein;
R3 is alkyl containing 2 to 12 carbon atoms;
b. dimer Acid;
c. hydrogenated dimer acid;
d. mixtures thereof;
and
3. a diol having the following structure:
HO—R4—OH
wherein;
R4 is alkyl ranging from 3 to 12 carbons;
and
4. a monofunctional alcohol independently selected from the group consisting of:
a. a branched alkyl having the structure:
wherein;
a is an integer ranging from 3-15;
b is an integer ranging from 5-17;
and mixtures thereof;
b. a fatty alcohol having the structure:
R2—OH
wherein;
R2 is alkyl having 8 to 26 carbon atoms,
and mixtures thereof.

25 more elements

Dependencies are inferred from the claim text.

Photostabilizing polymer

Life of this patent

Photostabilizing polymer

Life of this patent

Abstract

Claims19