Amphoteric optical brighteners, their aqueous solutions,...

Details Amphoteric optical brighteners, their aqueous solutions,... Amphoteric optical brighteners, their aqueous solutions,...

2006-03-28

2006-03-28

Balasubramanian, Venkataraman (Department: 1624)

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

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

C008S119000, C008S190000, C008S648000, C252S301210, C252S301230

Reexamination Certificate

active

07019134

ABSTRACT:
Water soluble, amphoteric optical brighteners (W) comprising at least one brightener-characteristic radical X which contain at least one anionic substituent and covalently linked over at least one tertiary amino group Z to at least one non-chromophoric, essentially aliphatic, polyquaternary ammonium-hydrocarbon radical Y containing more than one quaternary ammonium group and in which each hydrocarbon radical is optionally interrupted by and/or substituted with one or more further heteroatoms, have surprising brightening properties, especially in papermaking, and in the form of their aqueous solutions are of notable stability.

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