Method of quenching electronic excitation of chromophore-containing organic molecules photoactive compositions
View Patent ↗A method of quenching fluorescence of a naphthalate polyester that is subjected to UV-radiation in an amount sufficient to cause the naphthalate polyester to reach an excited state and fluoresce, comprising adding to the naphthalate polyester a fluorescence quenching amount of a compound of formula (1): wherein R 1 is an alkoxy; R 2 is an organic linker; k is either zero or one; l is either zero or one, wherein the sum of k+l is one; and m is an integer in a range from zero to about twenty.
1. A method of quenching fluorescence and excited state energy of a naphthalate compound that is subjected to UV-radiation in an amount sufficient to cause the naphthalate compound to reach an excited state and fluoresce, comprising adding to the naphthalate compound, in a sunscreen composition, a fluorescence quenching amount of a compound of formula (1):
wherein R 1 is an alkoxy; R 2 is an organic linker; R 3 is selected from a group consisting of a straight or branched C 1 -C 30 alkyl, a straight or branched C 1 -C 30 alkenyl, a straight or branched C 1 -C 30 alkynyl, and a polymer; k is either zero or one; l is either zero or one, wherein the sum of k+l is one; and m is an integer in a range from zero to about twenty.
2. The method of claim 1 , wherein m is an integer in a range from one to about twenty, and the organic linker is selected from a group consisting of CH 2 , CH 2 CH 2 , CH 2 CH 2 CH 2 , CH 2 CH(CH 3 )CH 2 , CH 2 C(CH 3 ) 2 CH 2 , CH 2 OCH 2 , CH 2 CH 2 OCH 2 CH 2 , and mixtures thereof.
3. The method of claim 2 , wherein m is equal to one and the organic linker is CH 2 C(CH 3 ) 2 CH 2 .
4. The method of claim 1 , wherein the alkoxy (R 1 ) has 1 to about 5 carbon atoms.
5. The method of claim 4 , wherein the alkoxy (R 1 ) is selected from a group consisting of methoxy and ethoxy.
6. The method of claim 5 , wherein the alkoxy (R 1 ) is methoxy.
7. The method of claim 5 , wherein the alkoxy (R 1 ) is ethoxy.
8. The method of claim 1 , wherein R 3 is a branched C3-C30 alkyl.
9. The method of claim 8 , wherein R 3 is ethylhexyl.
10. The method of claim 1 , wherein the alkoxy (R 1 ) is methoxy, R 3 is ethylhexyl, and m is equal to zero.
11. The method of claim 1 , wherein the naphthalate compound is selected from a group consisting of naphthalate polymer; naphthalate copolymer; naphthalate oligomer; dialkylnaphthalate; mixtures and blends thereof.
12. The method of claim 11 , wherein the naphthalate compound is a polyethylene napthalate polymer.
13. The method of claim 12 , wherein the naphthalate compound is poly(ethylene 2,6-naphthalenedicarboxylate).
14. The method of claim 11 , wherein the naphthalate compound is ethylhexyl naphthalate.