Dyestuff formulations
AssigneeBayer Aktiengesellschaft
InventorsWinfried Kruckenberg, Karl H. Schundehutte
Life of this patent
Estimating the term…
Abstract
Formulations for dyeing polyesters and polyamides, the dyestuff component of which does not tend to crystallize in the dyebath and the effluents of which can be readily degraded biologically, are obtained in an inexpensive manner when those organophilic dyestuffs which have melting points below 140.degree. C., preferably below 100.degree. C., are used and these dyestuffs are homogeneously mixed with emulsifying polar/non-polar compounds, such as, for example, fatty sulphates and sulphonates, without expensive fine comminution processes.
Claims29
A homogeneous dyestuff formulation free of organic solvent obtained without fine comminution of the dyestuff to below a particle size of 50.mu. consisting essentially of an organophilic dyestuff free from ionic groups other than COOH and having a melting point of less than 140.degree. C. admixed with an emulsifying polar/non-polar compound of the formula
- A--(B).sub.n --(D).sub.m
- in which
- A is a non-polar radical with at least 8 consecutive carbon atoms;
- B is a bridge member;
- n is 0 to 5;
- D is a hydrophilic group;
- and
- m is 1 to 5.
A dyestuff formulation according to 14, wherein A is an aliphatic hydrocarbon radical with at least 10 C atoms, and D is --SO.sub.3 H, --OSO.sub.3 H;
- or --OPO.sub.3 H.sub.2.
A method of preparing a dyeing liquor comprising a solution or liquid emulsion of an organophilic dyestuff free from ionic groups other than COOH and having a melting point below 140.degree. C., without fine comminutation of the dyestuff to below a particle size of less than about 50.mu. consisting essentially of combining the dyestuff with an emulsifying polar/non-polar compound of the formula
- A--(B).sub.n --(D).sub.m
- in which
- A is a non-polar radical with at least 8 consecutive carbon atoms:
- B is a bridge member;
- n is 0 to 5;
- D is a hydrophilic group;
- and
- m is 1 to 5,
- to form a homogeneous dyestuff formulation free of organic solvent and combining the formulation with a dyebath consisting essentially of water.
A method of converting an organophilic dyestuff free from ionic groups other than COOH and having a melting point below 140.degree. C. to a form yielding a very stable dyeing liquor without fine comminution of the dyestuff to below a particle size of 50.mu., consisting essentially of combining the dyestuff with an emulsifying polar/non-polar compound of the formula
- A--(B).sub.n --(D).sub.m
- in which
- A is a non-polar radical with at least 8 consecutive carbon atoms;
- B is a bridge member;
- n is 0 to 5;
- D is a hydrophilic group;
- and
- m is 1 to 5,
- to form a homogeneous dyestuff formulation free of organic solvent which upon addition to an aqueous dyebath provides a solution or liquid emulsion of the dyestuff.
Dependencies are inferred from the claim text.