Method of decreasing the UV light degradation of polymers

Details Method of decreasing the UV light degradation of polymers Method of decreasing the UV light degradation of polymers

2005-05-06

2009-06-09

Davis, Zinna N (Department: 1625)

Drug, bio-affecting and body treating compositions

Topical sun or radiation screening, or tanning preparations

C424S060000, C560S081000

Reexamination Certificate

active

07544350

ABSTRACT:
A method of decreasing the UV light degradation of a UV-light degradable polymer comprising adding to said polymer an effective amount of a compound of formula (IX):wherein, R19, R20and R21are the same or different and are selected from the group consisting of C1-C30alkyl, C3-C8cycloalkyl, substituted alkyl, substituted cycloalkyl, ester, aryl, heteroaryl, heterocycloalkyl, substituted aryl, substituted heteroaryl, substituted heterocycloalkyl, and amino; R17and R23are the same or different and are selected from the group consisting of C1-C30alkyl, C3-C8cycloalkyl, substituted alkyl, substituted cycloalkyl, ester, aryl, heteroaryl, heterocycloalkyl, substituted aryl, substituted heteroaryl, substituted heterocycloalkyl, cyano, and amino; R18and R22are the same or different and are selected from the group consisting of substituted diphenylmethylene, unsubstituted diphenylmethylene, substituted 9H-fluorene, and unsubstituted 9H-fluorene; t and u are each in the range of 1 to 100; s is in the range of 0 to 100; and a, b, c, and d are each in the range of 0 to 4.

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