DE95918C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

According to the method of Patent No. 97541 valuable cotton dyes are produced when amidosulfonic acids of benzene or Naphthalene series with sulfur and alkali sulfur or analogous substances higher terriperatures '.' heated.

It has now been shown that oxysulfonic acids and dioxysulfonic acids of benzene and Naphthalene series, subjected to the same treatment, pass into dyes which have tinctorial properties similar to those of the patent mentioned. They are capable of both boiling and cotton to color in cold bath. The nuances are predominantly dark brown, olive, blue-black, gray-black to pure black and due to their authenticity. against alkalis, acids and light, and especially distinguished by their fastness to washing. .

Examples:

i. Dye from β-naphthol-β ₄ -monosulfonic acid. + Sulfur + sulfur -

sodium.

A mixture of 1 part ßj-naphtol-ß ₄ -monosulfosaurem soda, 2 parts of sulfur, and 4 parts of sodium sulphide _(Na% S + 9 · aq) is heated by means of an oil bath, by läfst slowly rise the temperature. At 140 ⁰ (thermometer in the OeI) vigorous foaming begins, which soon ceases with careful stirring. The heating is then continued, and finally the melt is held at 250 to 260 ⁰ for about 4 hours. After cooling, the melt is dissolved in hot water, the solution filtered, and the filtrate evaporated to dryness. The dye thus obtained forms a brown-black, easily pulverizable mass and dyes cotton brown-black in a cold bath with the addition of alkali sulfur. If the dye is colored in a boiling bath mixed with soap and potash, a brown-black is also obtained.

2. Dye from u, c ^ -Dioxynaphthaleneß ₂ ßg-disulfonic acid -j- sulfur -f sulfur sodium.

A by mixing 1 part of a _r a ₄ -dioxynaphtalin-ß ß _{3 2} -disulfosaurem soda, 2 parts of sulfur, and 4 to 5 parts of sodium sulphide obtained mixture is heated in oil-bath at 250 ⁰ and then slowly about 4 hours at 250 to 260 ° , the initially red-brown melt taking on a blue-black color. After cooling, the melt is pulverized and used directly for dyeing. . He delivers like this on cotton. The dye formed in cold baths mixed with a little sodium sulphide turns blue-gray to black, depending on the strength. The same nuances are obtained when coloring in a boiling bath.

In an analogous way one arrives at the other dyes when ß-naphthol in the above examples the one hand, in place of the _{ß} 4} -monosülfosäure other a- or ß-Naphtolmonobezw. -polysulfonic acids are used, or if the a _t a ₄ -dioxynaphthalene - ß ₂ ß ₃ - disulfonic acid is replaced by other dioxynaphthalene sulfonic acids. Instead of the naphthol and

Dioxynaphthalene sulfonic acids can be used in the same Way, oxy- and dioxysulfonic acids of the benzene series are also used.

In the table below are the properties a number of these dyes listed: '■■ -

Raw melt. solution
in water Dye precipitated with hydrochloric acid. the end
see In baking soda
lye In soda In sulfur
acid 60 ° B. Coloration
on cotton Dye from: the end
see dark
green black dark
green little
soluble insoluble reddish
Brown i. o-cresol-
monosulfpic acid Gray
black orange black yellow-brown insoluble when heating
raspberry colored
solution . Brown 2. Ci ₁ ix ₄ -napht-
sulton Gray
black red black reddish
Brown very difficult
soluble difficult to dissolve,
when heating
reddish brown brown to
Brown black 3. P ₁ ß ₄ -naphtol-
sulfonic acid dark
Gray red cabbage
black red-brown difficult to solve
lich, yellow
green hey hard
soluble brown to
Brown black 4. P ₁ ß ₃ -naphtol-
sulfonic acid black red deep
black red-brown insoluble when heating
slowly soluble,
, reddish brown to
Brown black 5. P ₁ a ₄ -naphtol-
sulfonic acid Gray
black red black reddish
Brown insoluble when heating
slowly, soluble,
brownish brown to
Brown black 6. ß ^ naphthol
ß ₂ (3 ₃ -disulfo-
acid Gray
black red
Brown deep
black reddish
Brown insoluble when heating
slowly soluble,
brownish brown to
Brown black 7. ß _t -naphtol-
ß ₃ n ₄ -disulfo-
acid black yellow
orange black yellow-brown difficult to solve
lich with yellow
lighter color when heating
slowly soluble,
reddish red-brown 8. "! -Naphtol-
a ₂ c £ ₄ -disulfo-
acid Gray
Brown blue Brown
black easily sol
lich, blue quite
easily sol
lich, blue purple solution blue-gray to
black. 9. H ₁ K ₄ -Dioxy-
naphthalene-ß ₂ ß ₃ -
disulfonic acid blue
black

Instead of sodium sulphide, other alkali sulphides can also be used and instead of sulfur and alkali sulfur can also direct alkali polysulphides, mixtures of sulfur and alkali or similar substances can be used.

The amount of sulfur and alkali metal bezw. the substances with an analogous effect, and the temperature can be varied within certain limits.

The dyes thus produced all have the remarkable property that they are Can dye cotton in boiling and cold baths. Generally it is no need to clean the dyes. But you can easily do this by one z. B. the resulting melts in

boiling water dissolves, the solutions acidify and those with or without the addition of Table salt filtered off precipitates and dissolved in sulfur alkalis or caustic alkalis. These solutions can be used directly for staining.

Claims (1)

Patent claim: Process for the preparation of cotton dyes, consisting in that one oxy- and dioxysulfonic acids of the benzene and respectively. Naphthalene series with sulfur and alkali sulfur, or with alkali polysulphides, or mixtures of sulfur and alkalis BEZW. substances that act analogously to higher levels Temperatures heated.