Non-aqueous process for the dyeing of dyable materials at an elevated temperature in a non-reactive environment and in a non-aqueous dye solvent
OwnerIldo E. Pensa, C. Duff Hughes +2inventors
InventorsIldo E. Pensa, C. Duff Hughes, Nicholas S. Hood, Eugene M. Saunders
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Abstract
The present invention provides a non-aqueous process for the dyeing of a dyeable material at an elevated temperature by contacting a dyeable material with a dye composition at an elevated temperature in a non-reactive environment. The dye composition temperature and the time of contact between the dye composition and the dyeable material are sufficient to effectuate the dyeing of the material. The dye composition comprises a substantially non-aqueous solvent and a dyestuff.
Claims44
In a non-aqueous process for the dyeing of a dyeable material, the improvement comprising the steps of
- (a) contacting a dyeable material with a dye composition in a non-reactive, substantially oxygen-free atmosphere, the dye composition temperature and the time of contact between the dye composition and the dyeable material being sufficient to effectuate the dyeing of the dyeable material with the dye composition being at a temperature equal to or greater than the temperature at which dye degradation occurs in an oxygen containing atmosphere, the dye composition comprising a substantially non-aqueous solvent having a boiling point of at least 100.degree. C. and a dyestuff soluable in the solvent, the solvent being selected from the group consisting of aromatic esters, cycloaliphatic diesters, and triglycerides;
- (b) removing the dye composition from contact with the dyeable material;
- and
- (c) recycling the dye composition removed in step (b) to contact the dyeable material in step (a).
A non-aqueous process for the dyeing of a dyeable material comprising the steps of:
- (a) preheating the dyeable material;
- (b) contacting the preheated dyeable material with a dye composition in a non-reactive, subatantially oxygen-free atmosphere, the dye composition temperature and the time of contact between the dye composition and the dyeable material being sufficient to effectuate the dyeing of the dyeable material with the dye composition being at a temperature equal to or greater than the temperature at which dye degredation occurs in an oxygen containing atmosphere, the dye composition comprising a substantially non-aqueous solvent having a boiling point of at least 100.degree. C. and a dyestuff soluble in the solvent, the solvent being selected from the group consisting of aromatic esters, cycloaliphatic diesters, and triglycerides, the non-reactive atmosphere being selected from the group consisting of fluorocarbons and halogenated hydrocarbons;
- (c) removing the dye composition from contact with the dyeable material;
- (d) cooling the dyeable material;
- and
- (e) recycling the dye composition removed in step (c) to contact the dyeable material in step (b).
Dependencies are inferred from the claim text.