Patent GB-957140-A (GB)
Title: Process for dyeing and printing aromatic polyester fibres
IPC: D06P1/20
Filed: 1962-10-16
Abstract: Monoaroylamino-anthraquinones that are free of acidic groups imparting solubility in water, that have an anthraquinone residue consisting of 3 fused rings and that are free from hydroxyl groups are employed to dye materials of aromatic polyesters.  The said dyes may contain an a - or b -naphthoylamino or especially benzoylamino group, the a -position being preferred. The anthraquinone residue may be further substituted, especially in the a -position by -NH2, alkylamino, phenylamino, aliphatic or cycloaliphatic acylamino, alkoxy, alkylmercapto or nitro groups or halogen atoms.  The dyestuffs of the following formula are of special interest: <FORM:0957140/C3/1> in which R is a benzene residue that may be substituted, at least one X represents a hydrogen or halogen atom, an -NH2, aliphatic or cycloaliphatic acylamino, carboalkoxy, alkoxy or nitro group, the other X's being hydrogen atoms.  The residue R may be substituted with halogen atoms, alkyl or alkoxy groups.  A large number of dyestuffs are specified which may be prepared by monobenzoylation of the appropriate amino compound.  Mixtures of dyestuffs may also be used which mixtures sometimes show better affinity than single dyestuffs (see Example 2).  U.S.A. Specification 2,876,061 is referred to.ALSO:Fibrous materials of aromatic polyesters are dyed or printed by heating them with an aqueous dispersion of a monoaroylamino-anthraquinone which is free from water-solubilising acidic groups and from hydroxyl groups and whose anthraquinone residue consists of 3 fused rings.  The said dyes may contain an a - or b -naphthoylamino or especially benzoylamino group, the a -position being preferred.  The authraquinone residue may be further substituted, especially in the a -position by -NH2, alkylamino, phenylamino, aliphatic or cycloaliphatic acylamino, alkoxy, alkylmercapto or nitro groups or halogen atoms.  The dyestuffs of the following formula are of special interest: <FORM:0957140/D1-D2/1> in which R is a benzene residue that may be substituted, at least one X represents a hydrogen or halogen atom, an -NH2, aliphatic or cycloaliphatic acylamino, carboalkoxy, alkoxy or nitro group the other X's being hydrogen atoms.  The residue R may be substituted with halogen atoms, alkyl or alkoxy groups.  A large number of dyestuffs are specified.  Mixtures of dyestuffs may also be used which mixtures sometimes show better affinity than single dyestuffs (see Example 2).  Dyeing may be effected in the presence of dispersing agents, e.g. soap, sulphite cellulose paste liquor, the sodium salts of N-benzyl-m -heptadecylbenzimidazole disulphonic acid, di-isobutylnaphthalene sulphonic acid, and dinaphthyl methane disulphonic acid.  Polyethylene terephthalate fibres may be dyed under super-atmospheric pressure at 120 DEG C. from a slightly acid bath or in a presence of a number of specified swelling agents. The dyes may also be applied by printing or padding from a thickened solution advantageously containing urea and then thermofixed at 180-220 DEG C.  Mixed fabrics of polyester and cotton may be dyed and the dyebaths or print pastes may also contain a reactive or a vat dyestuff.  Cross-dyeing wool/polyester blends may be achieved due to the good reservation on wool.  Examples of dyeing polyethylene terephthalate are given in which a number of known auxiliaries are employed.  U.S.A. Specification 2,876,061 is referred to.