Patent ID: 11905434
Assignee: SWIMC LLC
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A composition, comprising:
a latex polymer comprising at least one ethylenically unsaturated monomer dispersed in an aqueous medium;
one or more UV-VIS absorbers, wherein the one or more UV-VIS absorbers comprises a substituted benzophenone capable of being a free radical generator, wherein the substituted benzophenone is phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, ethyl-2,4,6-trimethylbenzoylphenylphosphinate, 2,4,6-trimethylbenzophenone, 4-methylbenzophenone, 4-phenylbenzophenone, 2,2-dimethoxy-1,2-diphenylethanone, 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, isopropylthioxanthone, methyl-o-benzoyl-benzoate, methylbenzoylformate, benzoin ethyl ether, 4′-ethoxyacetophenone, 4,4-bis(diethylamino)benzophenone, 2,2-dimethoxy-2-phenylacetephenone, 2-hydroxy-2-methylpropiophenone, 2-benzyl-2-(diemthylamino)-4′-morpholinobutryophenone, 4-methylbenzophenone, benzophenone hydrazone, or a combination thereof;
one or more hindered amine light stabilizers; and
optionally one or more low-VOC coalescents;
wherein the one or more UV-VIS absorbers and the one or more hindered amine light stabilizers are present in the composition in a total combined weight of at least 0.5 wt-% based upon the total polymer solids in the composition;
wherein the one or more UV-VIS absorbers and the one or more hindered amine light stabilizers are present in a weight ratio of about 1:9 to about 7:3 (UV-VIS absorbers:hindered amine light stabilizers); and
wherein the composition is suitable for use in a paint and one or more of the following is true:
when the composition is used in a paint, applied to a substrate, and allowed to dry to form a dried film, the dried film has an improved din pick-up resistance by at least 10%, relative to the same composition without the one or more UV-VIS absorbers and the one or more hindered amine light stabilizers, based on a change in ΔE values;
when the composition is used in a paint, applied to a substrate, and allowed to dry to form a dried film, the dried film has an initial minimum gloss rating of at least 20 (satin-like), at least 35 (traditional semi-gloss), at least 70 (traditional gloss/high gloss architectural), or at least 85 (high gloss) units with a 60-degree gloss meter;
when the composition is used in a paint, applied to a substrate, and allowed to dry to form a dried film, the dried film has a gloss retention of less than a 10 unit drop over 2000 hours measured at 60-degree gloss according to ASTM G154, using Cycle 1 as listed in the standard; and/or
when the composition is used in a semi-glossy or glossy finish paint, applied to a substrate, and allowed to dry to form a dried film, the dried film has at least 80% gloss retention, the gloss retention being after at least 2000 hours measured by QUVA gloss retention at 60-degree gloss according to ASTM G154, using Cycle 1 as listed in the standard.