Improvements in the Manufacture of Tannin Compounds, more Especially Intended for Printing Purposes.
Year: 1889

page_text: Date of Application, 8th July, 1889
Complete Specification Left, 8th Apr., 1890-Accepted, 10th May, 1890
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Tannin Compounds, more
Especially Intended for Printing Purposes.
I BENJAMIN WILLCOX of 47 Lincoln's Inn Fields in the County of Middlesex Patent
Agent do hereby declare the nature of this Invention (which has been communicated
to me from abroad by The Farbenfabriken vorm. F. Bayer & Co. of Elberfeld in the
Empire of Germany) to be as follows:-
My foreign correspondents have discovered that by heating tannin or gallic acid to
from say about 100 to 160 degrees Centigrade in an oil bath with grape sugar or
certain other materials hereinafter specified a combination is formed which is readily
soluble in water and diluted acetic acid. and possesses the property of being
decomposed into its consistent parts in the steaming process when employed for
printing.
It is evident that a compound of this description which enables tannin to he
brought into action in the nascent condition is of great value as a substitute for the
ordinary tannin for printing processes in which that substance is employed in con-
junction with basic colouring matters for example. It has been ascertained by
experiment that in the case of indulines, for example a very superior effect is produced.
Raw sugar starch gum or dextrine or glycerine and the like may be employed in
place of the grape sugar.
The following is given as an example of the manufacture of these new compounds
named by my foreign correspondents Tannin-Glycosides and Tannin-Glycerides.
About thirty parts by weight of tannin and about fifty parts by weight of grape
sugar are heated in an oil bath to from about 140 to 160 degrees Centigrade until the
separation or splitting off of water which takes place with the violent reaction is
concluded. The product thus obtained is Tannin-Glycoside which is a solid substance
forming a syrup with water and dissolving readily in water and diluted acetic
acid.
In addition to the valuable property of producing tannin in the nascent state when
steamed the Tannin-Glycoside and Tannin-Glyceride also possess the advantage of
being free from the liability of spoiling after long standing which is common to
printing colours prepared with tannin in the ordinary way and is due to the formation
of tannin lake.
The new products manufactured according to this Invention are consequently
particularly well suited for the preparation of prepared colours for printing
purposes.
Dated this 8th day of Tul. 1000
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, Agents.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Tannin Compounds, more
Especially Intended for Printing Purposes.
I, BENJAMIN WILLCOX of 47 Lincoln's 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 Friedr. 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:-
My foreign Correspondents have discovered that by heating tannin to from say about

page_text: 100 to 160 degrees Centigrade with glycerine or grape sugar a combination is formed
which is readily soluble in water and diluted acetic acid, and possesses the property of
being decomposed into its constituent parts in the steaming process when employed
for the purpose of printing on textile fabrics.
It is evident that compounds of this description which enable tannin to be brought
into action in the nascent condition are of great value as a substitute for the ordinary
tannin for printing purposes in which that substance is employed in conjunction with
basic colouring matters for example. The following is given as an example of the
manufacture of these new compounds named by my foreign Correspondents "Tannin-
Glycoside" and "Tannin Glyceride." About thirty parts by weight of tannin and
about fifty parts by weight of grape sugar are heated together in an oil bath to
from about 140 to 160 degrees Centigrade until the separation or splitting off of water
which takes place is concluded. The product thus obtained is "Tannin Glycoside
a solid substance which very easily attracts water, forming a syrup and which readily
dissolves in water and diluted acetic acid. If in the foregoing example glycerine
instead of grape sugar be employed (it may be in the same proportion as that given
for the grape sugar), Tannin Glyceride is obtained which forms a thick syrup readily
soluble in water.
"
The new products manufactured according to this invention are particularly well
suited for the preparation of prepared colours for printing purposes.
Having now particularly described and ascertained the nature of the said Inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. The manufacture of compounds of tannin and glycerine or of tannin and grape-
sugar substantially as hereinbefore described.
2. The new products hereinbefore described and termed "Tannin Glycoside
"Tannin Glyceride."
Dated this 8th day of April 1890.
"and
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, Agents.