DE292569C - - Google Patents

Description

The subject of patent 292360 is a process for the representation - black indigoid Dyes by condensation of reactive isatin-a-derivatives with Aryla'minonaphtholen or Naphtimidazoles with a free o-position to the hydroxyl group ...

It has now been found that real

Vat dyes that color in valuable, deep blue to black nuances,. obtain

ίο be when you get through in the amino group other groups substituted aminonaphthols, namely acidyl derivatives or ureas

■ heteronuclear aminonaphthols or their substitution products and homologues '. with the exclusion of i-acetylamino-5-oxynaphthalene condensed with the isatin-α-derivatives. That the aminonaphthols, which are only substituted in the amino group, are technically very valuable. real dyes of black nuances could not be deduced from known facts.

'. conduct. '..'. _s . . ^x

■ ': Example.:' - '.

2.6 parts of 2-benzoylamino-5-oxynaphthalene

. 25 together with 2.2 parts of isatin-a-anilide and 25 parts acetic anhydride boiled until dye formation is complete. After this Cooling is filtered, the resulting dye · ■. washed with alcohol and dried. He '· colors from the vat. Textile fiber in real black tones on ...

Instead of 2.6 parts of 2-benzoylamino-5-oxynaphthalene, 1.7 parts of 5-5'-dioxy-2 ^< 2 ^/ -dinaphthylurea can also be used, a blue-black vat dye being formed.

The received. Products can be post-treated with .. 'Halogen and their fastness properties are further improved as a result. It should also be noted that 'of course, instead of the usual unsubstituted .. isatin-a-derivatives, their substitution products, e.g. B. the brominated, or homologues or analogs can be used. It is only essential that the compounds contain the easily exchangeable α-substituted group that enables them to condense with the naphthols. Here, homologues are compounds that contain a hydrocarbon radical instead of a hydrogen atom / analogues are those in which the benzene nucleus fused with other rings
derivatives.

is, such as B-, '' the "Naphtisatin-a-

From the table below, the properties of a number under 'are the present Process of falling dyes see- · 40 borrowed:. . ■. ·

'■ 1 ■ -v et "* 1, **«' v. "«. ('»' R
., -,. i y. - £ .- ^:! Λ el ■ - <'- ■ -'i Appearance ^{: l}
of
dye
powder St ■■ " " Solubility
· ■■■■. , hot
Nitrobenzene. it in
'- ■ con
more centered
Sulfur-,
acid Vat coloring i-Benzoyl'amino-5-oxynaphtha-.
. lin + isatin anilide. reddish
bronzing easily soluble,
blue pure blue ■ yellow black a-Benzoylamino-S-oxynaphtha-
lin + isatin anilide. . . ■ · . reddish
black easily soluble,
Red Blue blue green yellow black. 2-benzoylamino-5-ox'ynaphtha-
lin + isatinanilide; brominated
to the dibromine product -; deep
violet blue easily soluble,
pure blue ' green Blue yellow , black ■ 5 5'-dioxy-2 2'-dinaphthyl-
urea + isatin anilide, dark blue easily soluble,
blue red blue green yellow black w-PKenylacetyl-2 ~ amino-5-oxy-
naphthalene + isatin anilide. deep blue easily soluble,
. ■ blue red j pure blue yellow black 2-benzoylamino-8-oxynaphtha-
lin-f isatin anilide brownish
black easily soluble,
pure blue ' pure blue yellow black 8 8'-dioxy-2 2 ' _: dinaphthyl-
urea rf- isatin anilide violet
black easily soluble,
blue blue green yellow black

Claims (1)

Patent claim: Process for the preparation of indigoid dyes according to patent 292360, consisting in that one heteronuclear acidyl and urea derivatives of aminonaphthols, their Substitution products and homologues under Exclusion. of the i- ^ acetylamino-5-oxynaphthalene condensed with the isatin-a-derivatives,
under isatin-a-derivatives also their
Nuclear substitution products, homologues and analogs are understood, and the resulting dyes, if appropriate, treated with halogen. .