Method of quenching electronic excitation of...

Details Method of quenching electronic excitation of... Method of quenching electronic excitation of...

2009-04-29

2011-12-13

Choi, Ling (Department: 1761)

Compositions

Light transmission modifying compositions

Ultraviolet

C424S059000, C424S060000, C424S401000, C514S520000, C524S090000, C558S410000

Reexamination Certificate

active

08075808

ABSTRACT:
The photostabilizing electronic excited state energy—particularly singlet state energy from a UV-absorbing molecule has been found to be readily transferred to (accepted by) α-cyanodiphenylacrylate compounds of formulas (I) and (V) having an alkoxy radical preferably in the four (para) position (hereinafter methoxycrylenes) on one or both of the phenyl rings:wherein at least one of R1and R2is a straight or branched chain C1-C12alkoxy radical, preferably C1-C8, more preferably C1-C4, and most preferably methoxy, and any non-alkoxy radical R1or R2is hydrogen; and R3is a straight or branched chain C1-C24alkyl radical, preferably C12-C24, more preferably C20;wherein A and B are the same or different and are selected from the group consisting of oxygen, amino and sulfur; R1and R3are the same or different and are selected from the group consisting of C1-C30alkyl, C2-C30alkylene, C2-C30alkyne, C3-C8cycloalkyl, C1-C30substituted alkylene, C2-C30substituted alkyne, aryl, substituted aryl, heteroaryl, heterocycloalkyl, substituted heteroaryl and substituted heterocycloalkyl; R2is selected from the group consisting of C1-C30alkyl, C2-C30alkylene, C2-C30alkyne, C3-C8cycloalkyl, C1-C30substituted alkyl, C3-C8substituted cycloalkyl, C1-C30substituted alkylene, C2-C30substituted alkyne; R4, R5, R6and R7are the same or different and are selected from the group consisting of C1-C30alkoxy straight chin on branched and a, b, c and d are each either 0 or 1, and a, b, c and d add up to 1, 2, 3, or 4.

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