Year: 1888

page_text: in 1000 parts by weight of water so that the solution remains alkaline to the end.
The dyestuff thus obtained applied to wool in a neutral bath or to cotton in an alkaline
bath dyes the materials a beautiful greenish blue. The dyestuff is filtered and dried.
II. If in place of the 75 parts of the soda salt of the naphthol disulpho acid L
mentioned in the preceding example about half that quantity only be employed so that
there is one molecule of the naphthol sulpho acid to one molecule of dianisidine there is
obtained an intermediate product which yet contains a diazo group and is consequently
capable of uniting with naphthols and their sulpho acids to form blue azo dyes.
To obtain this intermediate product a solution of tetrazo diphenol ether composed of
317 parts by weight of hydrochloric dianisidine is poured or caused to flow into
a cold solution of 36 parts by weight of the soda salt of alpha naphthol disulpho acid
the latter solution being rendered acetic or maintained alkaline by soda. If the
intermediate product thus obtained he now combined with an alkaline solution of a
naphthol or its sulpho acid a great variety of blue dyes of from reddish brown to
greenish blue shades are produced.
By substituting for the diamido diphenol ether an equivalent quantity of tolidine
redder but yet useful products are obtained. The separation of the dye stuff is effected
by salting out with common salt pressing and drying.
Dated this 28th day of January 1888.
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, W.C.,
Agents.

page_text: Date of Application, 28th Jan., 1888
Complete Specification Left, 15th Oct., 1888
Complete Specification Accepted, 16th Nov., 1888
PROVISIONAL SPECIFICATION.
Improvements in and relating to the Manufacture of Blue and
Blueish Azo Dyes.
I, BENJAMIN WILLCOX of 47 Lincolns Inn Fields in the County of Middlesex
Patent Agent do hereby declare the nature of this. Invention which has been com-
mmunicated to me from abroad by the Farbenfabriken vormals Friedrich Bayer & Co.
of Elberfeld in the Empire of Germany to be as follows:-
This invention relates to the manufacture of blue and blueish azo dyes of the class
obtained by the action of Tetrazo ditolyl Tetrazo and diphenol ether upon naphthol sulpho
acids and consists in the use of the Beta naphthol delta mono sulpho acid or alpha
naphthol disulpho acid L of Schöllkopf and of the Tetrazo compound of Tolidine or
Diamido diphenol methyl or ethyl ether the azo dyes being manufactured by combining
one molecule of Tetrazo ditolyl ether or Tetrazo diphenol ether first with one molecule
of these acids and afterwards with one molecule of another phenol amide or a sulpho
acid thereof.
By combining one molecule of the Tetrazo compound of Tolidine or diamido
diphenol methyl or ethyl ether with one molecule of Schöllkopf's alpha naphthol
disulpho acid or one molecule of Beta naphthol delta mono sulpho acid an intermediate
product is obtained which is caused to act upon alpha naphthol beta naphthol alpha
naphthol mono sulpho acid, beta naphthol beta or delta mono sulpho acid, alpha
naphthol disulpho acid L or beta naphthol disulpho acid R in order to obtain direct
acting blue dyestuff's.
The following may serve as examples of the manufacture of a dye according to this
Invention
1. 31.7 parts by weight of hydrochloric diamido diphenol methyl ether are dissolved
in 1000 parts by weight of water mixed with 36 parts by weight of hydrochloric acid
at 21° Beaumé and converted into the tetrazo compound by flowing or pouring in a
solution. of 14 parts by weight of nitrite of sodium in 100 parts by weight of water.
This product is then caused to flow into a soda solution of 75 parts by weight of the
soda salt of the naphthol disulpho acid I obtained by Schollkopf's process dissolved

page_text: COMPLETE SPECIFICATION.
Improvements in and relating to the Manufacture of Blue and
Blueish Azo Dyes.
I BENJAMIN WILLCOX of 47 Lincolns Inn Fields in the County of Middlesex
Patent Agent do hereby declare the nature of this invention which has been com-
municated to me from abroad by the Farbenfabriken vormals Friedrich Bayer & Co.
of Elberfeld in the Empire of Germany 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 the manufacture of blue and blueish azo dyes of the class
obtained by the action of tetrazo diphenyl tetrazo-ditolyl and tetrazo-diphenol-ethers
upon naphthol-sulpho-acids and consists in combining two molecules of the Beta-
naphthol delta-mono-sulpho-acid or alpha-naphthol disulpho-acid L of Schöllkopf with
one molecule of the tetrazo compounds of benzidine tolidine or diamido diphenol-
methyl or-ethyl-ether or otherwise by combining one molecule of tetrazo-diphenyl
tetrazo-ditolyl or tetrazo diphenyl-ethers first with one molecule of these acids and
afterwards with one molecule of another phenol or a sulpho acid thereof.
By combining one molecule of the tetrazo compound of benzidine tolidine or
diamido diphenol-methyl or-ethyl-ether with one molecule of Schöllkopf's alpha-
naphthol-disulpho-acid L or one molecule of Beta-naphthol-delta-mono-sulpho-acid an
intermediate product is obtained which is caused to act upon alpha-naphthol, beta-
naphthol, alpha-naphthol mono-sulpho-acid, beta-naphthol-beta mono sulpho acid, or
heta naphthol disulpho acid R in order to obtain direct dyeing blue dyestuffs.
The following are examples of the manufacture of a dye according to this Invention.
(Example 1) 31.7 parts by weight of hydrochloric diamido-diphenol-methyl-ether
are dissolved in 1000 parts by weight of water mixed with 36 parts by weight of
hydrochloric acid of 21° Beaumé and converted into the tetrazo compound by adding
a solution of 14 parts by weight of nitrite of sodium in 100 parts by weight of water.
The resulting tetrazo compound is then caused to flow into a soda solution of 75 parts
by weight of the soda salt of the naphthol disulpho acid L obtained by Schöllkopf's
process dissolved in 1000 parts by weight of water so that the solution remains
alkaline to the end. The dyestuff thus obtained applied to wool in a neutral bath or to
cotton in an alkaline bath dyes the materials a beautiful greenish blue. The dyestuff
is filtered and dried.
(Example II). If in place of the 75 parts of the soda salt of the naphthol disulpho
acid L mentioned in the preceding example about half that quantity only be employed
so that there is one molecule of the naphthol sulpho acid to one molecule of diamido
diphenol-methyl-ether there is obtained an intermediate product which still contains a
diazo group and is consequently capable of uniting with naphthols and their sulpho or
carbonic acids to form blue azo dyes.
To obtain this intermediate product a solution of tetrazo diphenol-ether composed
of 317 parts by weight of hydrochloric diamido-diphenol-methyl-ether is poured or

page_text: caused to flow into a cold solution of 36 parts by weight of the soda salt of alpha-
naphthol-disulpho-acid, the latter solution being rendered acid by the addition of
acetic acid or maintained alkaline by soda. If the intermediate product thus obtained
be now combined with an alkaline solution of a naphthol or its sulpho acids a great
variety of blue dyes of from reddish blue to greenish blue shades are produced.
By substituting for the diamido diphenol ether an equivalent quantity of benzidine
or tolidine redder but yet useful products are obtained. The separation of the dyestuff
is effected by salting out with common salt pressing and drying.
Having now particularly described and ascertained the nature of the said inven-
tion, and the manner in which the same is to be performed I declare that what
I claim is
1. The process for producing azo-dyes or colours by combining one molecule of the
tetrazo compounds of Benzidine Tolidine or Diamido diphenol methyl or ethyl ethers
with two molecules of Beta-Naphtholdelta-mono-sulpho-acid or Alpha-Naphtholdisulpho
acid L of Schöllkopf, substantially as set forth.
2. The process for producing azo dyes or colours by combining one molecule of the
tetrazo compounds of Benzidine Tolidine or Diamido diphenol methyl- or ethyl-ethers
with one molecule of Beta-Naphthol deltamonosulpho acid or Alpha-Naphthol disulpho
acid L of Sohöllkopf and with one molecule of another Phenol, or a sulpho acid thereof
substantially as set forth.
3. As new articles of manufacture the dye-stuffs herein described.