| 摘要 |
Paper and like webs are given improved surface properties and resistance to ink penetration by means of a composition, readily dispersible in water at about 65 DEG -70 DEG C., of a small proportion of higher ketene dimer with a highly water soluble dextrin phosphate having 0.3-3 percent of phosphorus molecularly bound therein and typically containing 1-3 percent of free phosphate, or with a mixture of a water soluble noncationic starch derivative of low viscosity and suitable alkali metal phosphate. A composition particularly valuable for sizing papers of high-alum content contains the dextrin phosphate and 4-8 percent of ketene dimer with up to 20 percent of guar flour, about 2-5 percent of sodium fluoride and about 3-5 percent of sodium carbonate.
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