| 摘要 |
K-18145/A Aqueous dispersions of urea/formaldehyde polymers and the use thereof Aqueous dispersions comprising 15-35 % by weight of a urea/formaldehyde polymer (UF polymer), said dispersions having - a formaldehyde:urea (F:U) ratio of (1.25-1.40):1, - a content of free formaldehyde of less than 0.1 % by weight, - a specific surface area of 5-30 m2/g, - a pore volume of 2-4 cm3/g, - a mean particle size of 0.05-1 .mu.m, and - a mean agglomerate size of 3-10 .mu.m, are especially suitable for use as white pigments in paper manufacture.
|
