Patent number: 10632096
Abstract: A method of quenching excited state energy from a photodegradable pigment that has been excited by absorption of light having a wavelength in the wavelength range of 290-800 nm, comprising reacting a pigment with a conjugated fused tricyclic compound having electron withdrawing groups of Formula (II) or a salt thereof: wherein: A is selected from the group consisting of O, S, C?O, C?S, B1, B2, D1 and D2 are each independently selected from the group consisting of F, Cl, Br, I, CF3, CC13, NR33+, NO2, CN, C(?O)R4, C(?O)OR?, SO2R5, aryl, and —C?CHR6; each m independently is 0, 1, 2, 3, or 4; a is 0 or 1; each R? is independently selected from the group consisting of LI, alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, and aryl; R2 is selected from the group consisting of H, alkyl, cycloalkyl, alkenyl, alkynyl, and aryl; each R3 is independently selected from the group consisting of H and C1-C6 alkyl; each R4 is independently selected from the group consisting of H, alkyl, alkenyl, alkynyl,
Type:
Grant
Filed:
January 15, 2018
Date of Patent:
April 28, 2020
Assignee:
Hallstar Beauty and Personal Care Innovations Company
Inventors:
Craig A. Bonda, Shengkui Hu