摘要:
The present invention provides a crosslinking agent for a water-soluble polymer, which is stable and which provides the water-soluble polymer with improved water resistance and excellent characteristics. Further, the invention provides an aqueous composition suitable as a surface treating agent by which the characteristics of a substrate surface can be improved. The aqueous composition of the invention comprises a mixed aqueous solution containing a chelating agent having a pH of from 1 to 7 and a zirconium compound, and is useful as a surface treating agent, a crosslinking agent for a water-soluble polymer, etc. As the chelating agent, there may be listed amino carboxylic acid or its derivatives and, as the amino carboxylic acid, there may be listed monoamino monocarboxylic acid or monoamino dicarboxylic acid.
摘要:
Methoxyanthraquinones are produced from the corresponding nitroanthraquinones by reacting a nitroanthraquinone with methanol and an alkali in a reaction medium chiefly comprising methanol at a temperature of 50.degree.-130.degree. C under atmospheric or superatmospheric pressure in the presence of molecular oxygen wherein the dissolved oxygen concentration of the reaction medium is maintained at a value of at least 1 ppm.