Coumarin of the formula: ##SPC1## In which R.sub.1 represents an alkyl group having 1 to 5 carbon atoms, and either unsubstituted or substituted by a non-ionic and non-chromophoric group, R.sub.2 represents a benzene, styryl or heterocyclic residue such residue being unsubstituted or substituted by one or two non-ionic and non-chromophoric groups; process for the preparation of a coumarin of the above formula which comprises reacting an orthohydroxy-benzaldehyde of formula (II) upon an acid of formula (III) or one of its functional derivatives: ##SPC2## Wherein R.sub.1 and R.sub.2 have the same definitions as in claim 1; process for the fluorescent brightening of fibrous material of synthetic origin which comprises treating the material with a coumarin of the above formula; fluorescent brightening composition containing a coumarin of the above formula and a dispersing agent resulting from the condensation of naphthalene-sulphonic acids with formaldehyde in the presence of or absence of phenol compounds, said dispersing agent comprising 30% to 50% monosulphonated condensates, 30% to 50% disulphonated condensates and 10% to 40% trisulphonated or higher polysulphonated condensates; fibres of synthetic origin treated with a coumarin of the above formula or with a brightening composition as set out above.
公式为:##
SPC1## 其中R.sub.1表示1至5个碳原子的烷基,可以是未取代的或被非离子和非色团基团取代的;R.sub.2表示苯基,亚基或杂环残基,该残基可以是未取代的或被一或两个非离子和非色团基团取代的;制备上述公式的
香豆素的过程包括将公式(II)的邻羟基
苯甲醛与公式(III)或其官能衍
生物之一发生反应:##
SPC2## 其中R.sub.1和R.sub.2的定义与权利要求1中相同;用上述公式的
香豆素处理合成纤维材料的荧光增白过程;荧光增白组合物包括上述公式的
香豆素和
萘磺酸与
甲醛在
酚类化合物的存在或不存在下缩聚而成的分散剂,所述分散剂包括30%至50%的单
磺酸缩聚物,30%至50%的双
磺酸缩聚物和10%至40%的三
磺酸或更高
磺酸缩聚物;用上述公式的
香豆素或上述增白组合物处理的合成纤维。