Year: 1886

page_text: We, Dr. ANTON Rossi, and CARL HELLFRISCH, both of Offenbach on the Main in
the German Empire, Chemists, do hereby declare the nature of this invention to be
as follows:
"
This invention relates to the manufacture of a substance which can be applied as a
gum in substitution for gum arabic. For this purpose a mixture of starch, made
from potatoes, maize or the like, with water and acid, preferably sulphuric or hydro-
chlorie, is boiled under pressure until the mass, originally in a pasty condition, begins
to become fluid and the formation of sugar is scarcely perceptible, whereupon the
operation is stopped and the material is put into a receptacle in which its excess of
acid is neutralised. The neutral material is replaced in the boiler and again boiled
under considerable pressure whereby the free starch which it contains is converted
into gumy matter (gommaline). The product, consisting of dextrin, gommaline,
traces of glucose, cellulose, and the salts resulting from the neutralisation, is in the
first place freed in the Taylor apparatus from the cellulose and salts, and is then
filtered through animal charcoal. The limpid fluid thus obtained is concentrated,
partly in vacuo and partly in the open, to the thickness of syrup, and may be sold in
this form. Or it may be dried under agitation in a steam jacketted vessel, and, after
cooling, broken up into fragments.
The product thus obtained is clear as water, hard like glass and not hygroscopic, it
possesses adhesive qualities very nearly equal to those of gum arabic, and can be used
in substitution for it with colours and for other purposes. It has a slightly sweetish
taste but contains so little saccharine matter that it may be exposed for days without
absorbing moisture, and lias no action on the substances with which it may be com
bined. It thus can effectually take the place of gum arabic in all its industrial
applications, and probably also in medicinal uses.
Dated this 25th day of August 1886
ABEL & IMRAY,
28. Southampton Buildings, London, W.C.,
Agents for the Applicants.

page_text: We, Dr. ANTON ROSSI and CARL HELLFRISCHL, both of Offenbach on the Main in
the German Empire, Chemists, 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 the manufacture of a substance which can be applied as a
gum in substitution for gum arabic. For this purpose a mixture of starch, made
from potatoes, maize or the like, with water and acid, preferably sulphuric or hydro-
chloric, is boiled under pressure until the mass, originally in a pasty condition, begius
to become fluid and there is a scarcely perceptible formation of sugar, whereupon the
operation is stopped and the material is put into a receptacle in which its excess of
acid is neutralised. The now neutral material is replaced in the boiler and again
boiled under considerable pressure, whereby the free starch which it contains is con-
verted into gummy matter (gommaline). The product, consisting of dextrin,
gommaline, traces of glucose, cellulose, and the salts resulting from the neutralisation.
is in the first place freed in the Taylor apparatus from the cellulose and salts, and is
then filtered through animal charcoal. The limpid fluid thus obtained is concentrated,
partly in vacus and partly in the open, to the thickness of syrup and may be sold in
this form. Or it may be dried under agitation in a steam jacketted vessel, and after
cooling broken up into fragments.
The product thus obtained is clear as water, hard like glass and not hygroscopic:
it possesses adhesive qualities very nearly equal to those of gum arabie, and can be
used in substitution for it with colours, and for other purposes. It has a slightly
sweetish taste but contains so little saccharine matter that it may be exposed without
absorbing moisture, and has no action on the substances with which it may be
combined. It thus can effectually take the place of gum arabic in all its industrial
applications, and probably also in medicinal uses.
Having now particularly described and ascertained the nature of our said invention
and in what manner the same is to be performed, we declare that what we claim is:―
The manufacture of gum, by boiling starch under pressure with water and acid,
neutralising the acid, again boiling under pressure, eliminating salts and cellulose,
filtering and concentrating, substantially as herein described.