Patent ID: 7019134

Claim:
A water soluble, amphoteric optical brightener compound of the average formula X-[Z-Y] n in which X is a precursor compound containing the structure of formula (Ib′) wherein n is from 1 to 2, p is 0, 1 or 2, R 0 ′″ is hydrogen, methyl, methoxy or chlorine, M is hydrogen or an alkali metal cation, Z is a tertiary amino group, covalently linking X to Y, and Y is the reaction product of epichlorohydrin with a polyfunctional aliphatic alcohol of formula (III′) H—(CHOH) x3 —H (III′) with x3 being 3 to 6, and a primary, secondary or tertiary mono- or polyamine or mixtures thereof.