发明授权
US5531797A Aqueous dye preparations containing coumarin dyes 失效
含有香豆素染料的水性染料制剂

Aqueous dye preparations containing coumarin dyes
摘要:
Aqueous dye preparations contain from 12 to 30% by weight, based on the weight of the preparation and calculated as free acid, of a dye of the formula ##STR1## where L.sup.1 and L.sup.2 are each C.sub.1 -C.sub.4 -alkyl and Cat.sup..sym. is an alkali metal ion or an unsubstituted or substituted ammonium ion, and are used for coloring paper stocks.
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