# US 10,246,552 B1 · Photostabilizing polymer > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,246,552 B1 - Document ID: US10246552B1 - Status: Granted - Kind: B1 - Application number: 15/648,827 - Filed: 2017-07-13 - Granted: 2019-04-02 - Earliest claimed: 2016-07-13 - Assignees: SurfTech Corporation - Applicants: Thomas O'Lenick - Inventors: Thomas O'Lenick - Web page: https://patentgrep.com/patent/US10246552B1 ## CPC - C08G 63/6856: {Dicarboxylic acids and dihydroxy compounds} - A61K 8/85: Polyesters - A61Q 17/04: Topical preparations for affording protection against sunlight or other radiation; Topical sun tanning preparations - C08G 63/48: by unsaturated higher fatty oils or their acids; by resin acids - C08G 63/50: by monohydric alcohols - C08G 63/52: Polycarboxylic acids or polyhydroxy compounds in which at least one of the two components contains aliphatic unsaturation - C08G 63/6858: {Polycarboxylic acids and polyhydroxy compounds in which at least one of the two components contains aliphatic unsaturation} - A61K 2800/52: Stabilizers - C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS - A61K: PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES (devices or methods specially adapted for bringing pharmaceutical products into particular physical or administering forms A61J3/00; chemical aspects of, or use of materials for deodorisation of air, for disinfection or sterilisation, or for bandages, dressings, absorbent pads or surgical articles A61L; soap compositions C11D) - A61Q: SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS ## 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. ## Claims ### Claim 1 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. ### Claim 2 (depends on 1) The photostabilizing polymer of claim 1 wherein the photo-absorbing group has the following structure: wherein x is 6. ### Claim 3 (depends on 1) The photostabilizing polymer of claim 1 wherein the photo-absorbing group has the following structure: wherein x is 7. ### Claim 4 (depends on 1) The photostabilizing polymer of claim 1 wherein the diol is propanediol. ### Claim 5 (depends on 1) The photostabilizing polymer of claim 1 wherein the diacid is hydrogenated dimer acid. ### Claim 6 (depends on 1) The photostabilizing polymer of claim 1 wherein the diacid is azelic acid. ### Claim 7 (depends on 1) The photostabilizing polymer of claim 1 wherein the photo-absorbing group has the following structure: wherein x is 6 and the diacid is dimer acid. ### Claim 8 (depends on 1) The photostabilizing polymer of claim 1 wherein the photo-absorbing group has the following structure: wherein x is 7 and the diacid is dimer acid. ### Claim 9 (depends on 2) The photostabilizing polymer of claim 2 wherein the diol is propanediol. ### Claim 10 (depends on 2) The photostabilizing polymer of claim 2 wherein diacid is hydrogenated dimer acid. ### Claim 11 (depends on 2) The photostabilizing polymer of claim 2 wherein the diacid is azelic acid. ### Claim 12 A process of protecting skin, which comprises contacting the skin with a photostabilizing concentration of 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 groups 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; and mixtures thereof; 3. a diol having the following structure: HO—R4—OH wherein; R4 is alkyl moiety having 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. ### Claim 13 (depends on 12) The process of claim 12 wherein the photostabilizing concentration is between 0.1 and 10.0% by weight. ### Claim 14 (depends on 12) The process of claim 12 wherein the photostabilizing concentration is between 0.5 and 5.0% by weight. ### Claim 15 (depends on 12) The process of claim 12 wherein the photo-absorbing group has the following structure: wherein x is 6. ### Claim 16 (depends on 12) The process of claim 12 wherein the photo-absorbing group has the following structure: wherein x is 7. ### Claim 17 (depends on 12) The process of claim 12 wherein the diol is propanediol. ### Claim 18 (depends on 12) The process of claim 12 wherein the diacid is hydrogenated dimer acid. ### Claim 19 (depends on 12) The process of claim 12 wherein the diacid is azelic acid.