Optical brightening agents

Details Optical brightening agents Optical brightening agents

2005-06-24

2010-10-12

Pyon, Harold Y (Department: 1796)

Organic compounds -- part of the class 532-570 series

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

C544S194000, C008S442000, C008S648000

Reexamination Certificate

active

07812156

ABSTRACT:
The instant invention relates to stilbene optical brightening agents which combine a high solubility in water while providing superior fluorescent whitening effects when applied to the surface of paper in either the size-press or in a pigmented coating composition and which show a reduced anionic charge. The instant optical brighteners may also be used for finishing of textiles.

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International Search Report for PCT/EP2005/052960 mailed Sep. 13, 2005.
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PCT Notification of Transmittal of the International Preliminary Examination Report for PCT/EP2005/052960, mailed Aug. 22, 2006.
Claussen et al., “Ways to deactivate light-induced excited states of additives in polymers Structure-activity relationship in a group of stilbene-triazine optical brightening agents. Preliminary results ways to deactivate light-induced excited states of additives in polymers”—Bundesminist. Forsch Technol., Weltraum forsch. Weltrantechnol BMPT-FB-W 81-046 pp. 1-35; XP009048592 Dec. 1981.
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