Method of dyeing using the combination of certain halogenated hydrocarbons and aromatic solvents in an aqueous dye admixture

A method of dyeing synthetic fibers, comprising the steps of:

• 1. contacting the fibers with an aqueous dyeing formulation in a pressurizeable chamber, said aqueous dyeing formulation including a dyestuff and an effective amount of an emulsifier to suspend said dyestuff in said aqueous dyeing admixture;
• 2. pressurizing said chamber to a first pressure and increasing the temperature of said aqueous dyeing admixture to a first temperature;
• 3. introducing from about 0.5% to about 20% based on the dry weight of the fibers of a mixture of an emulsifier, an aliphatic halogenated hydrocarbon and an aromatic carrier into said chamber, the quantity of said emulsifier being effective when combined with the emulsifier previously present to disperse said halogenated hydrocarbon and said aromatic carrier in said aqueous dyeing admixture, said aliphatic halogenated hydrocarbon boiling at said first pressure at a temperature which is less than said first temperature, said aliphatic halogenated hydrocarbon being chosen from the group consisting of perchloroethylene, methylene chloride, chloroform, 1,2 dichloroethane, and mixtures thereof and said aromatic carrier being chosen from a group consisting of:
• benzene derivatives having the structural formula ##STR23## naphthalene derivatives having a structural formula ##STR24## wherein each R.sub.1, R.sub.2, R.sub.3 and R.sub.4 individually is chosen from the group consisting of:
• a hydrogen, an alkyl group having from 1 to 5 carbon atoms, a halogen, a hydroxyl group, a phenyl group, a ##STR25## group with n=1-5, a ##STR26## group with n=1-5, a benzyl group, a phenethyl group and an --NO.sub.x group with x=1-3, wherein at least one of R.sub.1-4 is a moiety other than hydrogen;
• and
• mixtures of said aromatic compounds;
• 4. maintaining said aqueous dyeing admixture at a holding temperature which is greater than the boiling point of said aliphatic halogenated hydrocarbon compound at said pressure for an effective amount of time to dye said fibers;
• 5. cooling said dyeing admixture;
• 6. depressurizing said dyeing chamber;
• and
• 7. recovering said dyed fibers.

A method of dyeing synthetic fabrics having a pile, comprising the steps of:

• 1. applying to the pile an aqueous dyeing admixture containing from about 1% to 65% by weight of an organic dyeing formulation, said organic dyeing formulation including:
• a. from about 40% to about 98% by weight based on the weight of said formulation of a halogenated hydrocarbon chosen from the group consisting of methylene chloride, chloroform and 1,2 dichloroethane;
• b. from about 1% to about 60% by weight based on the weight of said formulation of an aromatic carrier chosen from the group consisting of:
• benzene derivatives having the structural formula ##STR32## naphthalene derivatives having a structural formula ##STR33## wherein each R.sub.1, R.sub.2, R.sub.3 and R.sub.4 individually is chosen from the group consisting of:
• a hydrogen, an alkyl group having from 1 to 5 carbon atoms, a halogen, a hydroxyl group, a phenyl group, a ##STR34## group with n=1 to 2, a ##STR35## group with n=1-5, a benzyl group, a phenethyl group and an --NO.sub.x group with x=1-3;
• wherein at least one of R.sub.1-4 is a moiety other than hydrogen, and
• mixtures of said aromatic compounds;
• c. an effective amount of a dyestuff to dye said pile to the desired depth of color;
• and
• d. an effective amount of an emulsifier to disperse said halogenated hydrocarbon, said aromatic carrier and said dyestuff in said aqueous dyeing admixture;
• 2. setting the dye by steaming the pile for an effective amount of time to set said dyestuff;
• 3. rinsing the pile;
• and
• 4. drying the pile.