Improvements in Liquid Casein Glue.
Year: 1897

page_text: I, HERMANN BOLDER of Joachimsthalerstrasse 41, Charlottenburg, in the German
Empire, Manufacturer, do hereby declare the nature of this invention to be as
follows:-
This liquid casein glue consists of a yellowish translucent liquid of medium
consistency. Its adhesive or binding properties are at least equal to those of
joiner's glue, and it has the advantage of being always ready for use without the
necessity of warming either it or the material to which it has to be applied.
Furthermore, the heating stove or the like not being required, the constant
danger of fire in a joiner's shop is obviated.
An additional good quality of this glue is that it offers great resistance to
water and damp.
The glue may be manufactured as follows:-
Dry casein (known in the trade as casein II) is mixed with either a solution
of borax or a solution of ammonia or a mixture of the two, a faint alkaline
reaction being maintained. The mixture is then heated for about half an hour
at a temperature which nearly reaches boiling point, ammonia being added in
small quantities to maintain the slight alkaline reaction.
Glue so prepared has no corrosive or similar action and may be used in the
finest bookbinding and paper work. Other dilute alkalies may be used instead
of the ammonia, but in many cases it will be found that with only a slight excess
they have a corrosive action.
The liquid casein glue may be mixed with starch in any proportion and then still
forms a glue possessing great binding power. In this connection it is preferred
to use liquid starch (that known in the trade as prepared by Uhland's method).
or starch liquefied by treatment with diluted alkalies.
1007
W. E. HEYS & SON,
Agents for the Applicant.
Improvements in Liquid Casein Glue.
HERMANN BOLDER, of Joachimsthalerstrasse 41 Charlottenburg, in the German
Empire, Manufacturer, do hereby declare the nature of this invention, and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
This liquid casein glue consists of a yellowish translucent liquid of medium
consistency. Its adhesive or binding properties are at least equal to those of
joiner's glue, and it has the advantage of always being ready for use without
071

page_text: the necessity of warming either it or the material to which it has to be applied.
Furthermore, the heating stove or the like not being required, the constant danger
of fire in a joiner's shop is obviated.
An additional good quality of this glue is that it offers great resistance to
water and damp.
The following is an example of how this glue may be conveniently prepared.
100 parts of dry casein (known in the trade as casein II) are mixed with from
60 to 80 parts of water in which two parts of borax have been dissolved.
This mixture is then heated with constant stirring to a temperature which
nearly reaches boiling point and is maintained at this temperature for a period
of about half an hour.
If desired a solution of ammonia may be used instead of the borax solution,
sufficient ammonia being employed to give a slight alkaline reaction. When
ammonia is used, further small quantities will have to be added during the
heating process to maintain the slight alkaline reaction.
.
Glue so prepared has no corrosive or similar action and may be used in the
finest bookbinding and paper work. Other dilute alkalies may be used instead
of the ammonia, but in many cases it will be found that with only a slight excess
they have a corrosive action.
The liquid casein glue may be mixed with starch in any proportion and then
still form a glue possessing great binding power but which is thicker than the
glue without the starch. In this connection it is preferred to use liquid starch
(such as that prepared by Uhland's method) or starch liquefied by treatment with
diluted alkalies.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is:-
1. The method of preparing liquid casein glue which consists in treating dry
casein with a solution of borax or with a solution of ammonia substantially as
and in the proportions hereinbefore set forth, with or without the subsequent
addition of liquid starch.
2. Liquid casein glue prepared by treating dry casein with a solution of borax
or with a solution of ammonia, substantially as and in the proportions hereinbefore
described.
3. Liquid casein glue prepared by treating dry casein with a solution of borax
or with a solution of ammonia substantially as and in the proportions hereinbefore
described and with the subsequent addition of liquid starch.
4. A liquid casein glue prepared substantially as hereinbefore set forth.
Dated this 10th low of C
1000