Snia Viscosa Societa Nazionale Industria Applicazioni Viscosa S.p.a.

Snia Fibre Spa

Snia Viscosa S.p.a.

Eugenio Magni

Claudio Pernetti

A method of dyeing textile materials of polycapronamide, enabling low temperature dyeing conditions and process duration times which do not exceed the art standards, is characterized by the following combined features: (a) use of at least two discrete combinations of dyestuffs, which show different kinetic behaviors from each other; (b) maintenance of an alkaline pH at tapering values, in the extreme down to neutral; (c) use of exclusively anionic dyeing aids; and (d) maintenance through the various method steps of a maximum temperature as high as 60.degree. C., preferably as 40.degree. C. Perfectly uniform dyeing is achieved through the utilization of conventional apparata and dyeing method procedures.

Method of dyeing polycapronamide textile articles using two acid dye

A process is described for the fast dyeing of textile materials constitut at least to a significant degree, by polyamides, in particular quick dyeing polyamides, characterized in that a dye bath is employed comprising acid dyes to which a combination of reagents (e.g. ammonium sulphate and caustic soda) is added that is adapted to impart to the bath an initial alkaline pH and to lower the pH by elimination of volatile bases, at least at the final heating temperatures, and in that the bath is heated until final temperatures between 60.degree. C. and 80.degree. C. are attained.

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Busto Arsizio, Italy

Eugenio Magni