Water-based compositions with long term gloss retention

A method of preparing an aqueous coating composition, the method comprising:

• providing a latex polymer dispersed in an aqueous medium, wherein the latex polymer comprises at least one ethylenically unsaturated monomer;
• providing one or more UV-VIS absorbers, wherein the one or more UV-VIS absorbers comprises a substituted benzophenone that is capable of being a free radical generator, wherein the substituted benzophenone comprises Formula (I):
• wherein A is an oxygen atom or N—NH2;
• wherein n is 0 or 1, m is 0 or 1, and y is 0 to 5, with the proviso that n, m and y are each 0 when A is N—NH2;
• wherein R1 and R2, if present, independently from each other comprise an organic linking group;
• wherein R3 comprises an alkanoyloxy group, C1-C3 alkyl, diethylaminogroup, or a 6-membered nitrogen and oxygen-containing saturated heterocyclic group;
• and
• wherein X is a phenyl group, hydroxy-2-methyl-propyl group, an alkanoyloxy group, or a phospine oxide group, with the proviso that when X comprises a phenyl group then the total of m, n and y is ≥1;
• providing one or more hindered amine light stabilizers;
• optionally providing one or more low-VOC coalescents;
• and
• combining the polymer, the one or more UV-VIS absorbers, the one or more hindered amine light stabilizers, and optionally the low-VOC coalescent;
• wherein at least one of the following is true:
• the one or more UV-VIS absorbers and the one or more hindered amine light stabilizers are present in the coating composition in a total combined weight of at least 0.5 wt-% based upon the total resin solids of the coating composition;
• or
• the one or more UV-VIS absorbers and the one or more hindered amine light stabilizers are present in the coating composition in a weight ratio of about 1:9 to about 7:3 UV-VIS absorbers.

A method of preparing an aqueous coating composition, the method comprising:

• providing a latex polymer dispersed in an aqueous medium, wherein the latex polymer comprises at least one ethylenically unsaturated monomer;
• providing one or more UV-VIS absorbers, wherein the one or more UV-VIS absorbers comprises a substituted benzophenone that is capable of being a free radical generator, wherein the substituted benzophenone comprises Formula (II):
• wherein A is an oxygen atom or N—NH2;
• wherein n is 0 or 1, m is 0 or 1, y is 0 to 5, and z is 0 to 5, with the proviso that n, m, y and z are each 0 when A is N—NH2 and with the further proviso that the total of n, m, y and z is ≥1 when A is an oxygen atom;
• wherein R1 and R2, if present, independently from each other comprise an organic linking group;
• wherein R3, and R4, if present, independently from each other an alkanoyloxy group, C1-C3 alkyl, diethylaminogroup, a 6-membered nitrogen and oxygen-containing saturated heterocyclic group, or form a bridge comprising an S atom;
• providing one or more hindered amine light stabilizers;
• optionally providing one or more low-VOC coalescents;
• and
• combining the polymer, the one or more UV-VIS absorbers, the one or more hindered amine light stabilizers, and optionally the low-VOC coalescent;
• wherein at least one of the following is true:
• the one or more UV-VIS absorbers and the one or more hindered amine light stabilizers are present in the coating composition in a total combined weight of at least 0.5 wt-% based upon the total resin solids of the coating composition;
• or
• the one or more UV-VIS absorbers and the one or more hindered amine light stabilizers are present in the coating composition in a weight ratio of about 1:9 to about 7:3 UV-VIS absorbers.