Improvements in the Manufacture of Colouring Matters.
Year: 1888

page_text: [Communicated from abroad by RUPERT GREVILLE WILLIAMS, of Albany, in the
County of Albany, State of New York.]
Improvements in the Manufacture of Colouring Matters.
I, HENRY HARINGTON LEIGH, Fel. Inst. P.A., Assoc. M. Inst. C.E.,. practising as
Phillips & Leigh, at No. 22, Southampton Buildings, Chancery Lanc, in the County
of Middlesex, Engineer and Patent Agent, do hereby declare the nature of this
invention to be as follows :-
My invention relates to the production of new coloring matters obtained by the
action of a salt of tetrazo-diphenyl or its homologues, or the carbo or sulpho acids or
substitution products of a salt of tetrazo-diphenyl or its homologues, on the di-hydroxyd
of toluene or its higher homologues, or on the substitution-products or sulpho acids of
the same.
The following is an example of how I produce practically a red coloring matter
which dyes unmordanted cotton.in an alkaline bath.
28 pounds of benzidine sulphate are suspended in a fine state of division in
200 pounds of water, and 25 pounds of muriatic acid of 22° Beaumé are added. The
mixture is then cooled with ice, and 14 pounds of nitrite of soda, dissolved in five
times that weight of water, are then slowly run in. After the tetrazo compound is
fully formed, the solution is poured into 28.4 pounds of orcin, 100 pounds of acetate
of soda, and 10 pounds of caustic soda, dissolved in 100 gallons of water. The brown
insoluble precipitate thus formed is filtered off after the lapse of fifteen hours and
when washed is converted into its soda salt in the usual manner.
The colouring matter thus produced dyes unmordanted cotton red in an alkaline or
soap bath, and the color is fast to soaping.

page_text: Improvements in the Manufacture of Coloring Matters.
I, HENRY HARINGTON LEIGH, Fel. Inst. P.A., Assoc. M. Inst. C.E., practising as
Phillips & Leigh, of No. 22 Southampton Buildings, Chancery Lane, in the County
of Middlesex; Engineer and Patent Agent, do hereby declare the nature of this
invention, and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:-
This invention relates to improvements in the manufacture of coloring matters
obtained by the action of a salt of tetrazo-diphenyl or its homologues, or the sulpho-
acids, or substitution products of a salt of tetrazo-diphenyl or its homologues, on the
di-hydroxyd of toluene, or its higher homologues, or on the substitution products or
sulpho-acids of the same.
The following are examples of how, according to this invention, there are produced
practically coloring matters which dye unmordanted cotton in an alkaline soap bath,
the resultant color being fast to soaping.
Example 1.28 pounds of benzidine sulphate are suspended in a fine state of
division in 200 pounds of water, and 25 pounds of muriatic acid, 22° Beaumé, are
added. The mixture is then cooled with ice, and 14 pounds of nitrite of soda, dissolved
in five times its weight of water, are then slowly run in. After the tetrazo compound
is fully formed, the solution is poured into 28.4 pounds of orein, and 100 pounds of
acetate of soda, and 10 pounds of caustic soda, dissolved in 100 gallons of water.
The brown precipitate thus formed is filtered off after the lapse of 15 hours and
washed.
Example 2. If instead of the 28-4 pounds of orcin used in Example 1,
312 pounds of di-hydroxy xylene be substituted, the resulting color is of a blue
shade.
Example 3. The orcin in Example 1 can be replaced with 40-8 pounds of its sulpho-
acid.
Example 4. Instead of the 28 pounds of benzidene used in Example 1, 30-2 pounds
of tolidine can be used, and the resulting color is a blue shade of red.
Example 5. Instead of the 28 pounds of benzidene used in Example 1, 37 pounds
of a sulpho-acid of di-amido stilbene can be substituted.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is,
As new coloring matters, the products which are formed by the action of a salt of
tetrazo-diphenyl or its homologues, or the sulpho-acids or substitution products of a
salt of tetrazo-diphenyl or its homologues, on the di-hydroxyd of toluene or its higher
homologues, or on the substitution products or sulpho-acids of the same, substantially
as set forth.
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