| 摘要 |
Dispersions of optical brighteners containing (a) 5-60 wt% optical brightener of formula (I) as the free acid, X1, X2, Y1, Y2 = NH2, prim. or sec. amine residue, optionally branched alkoxy, or phenoxy; (b) 0.01-3 wt% polyhydroxy compound, (c) water and optionally (d) other additives. Also claimed are (i) compositions containing (I) for coating paper and for brightening fibre dispersions in paper production, and (ii) paper obtained by the use of (I) as above. |
