Process for Producing Waterproof and Washable Glazed Paper.
Year: 1897

page_text: Date of Application, 28th July, 1897-Accepted, 20th May, 1898
COMPLETE SPECIFICATION.
Process for Producing Waterproof and Washable Glazed Paper.
I, Dr. THEODOR SCHIFFER, of Venloerstrasse, Dulken, Prussia, Chemist, 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: —
The object of the process forming this invention is to extend the varied applica-
tions of glazed chromo-paper (that is to say, paper treated with chrome-gelatine
which is a mixture of glue or size and red chromate of potash, and subjected to the
action of light), by rendering it waterproof and washable.
A. paper of this kind
is admirably suitable for the production of paper articles of clothing (collars and
the like), as well as of card-board for the packing of hygroscopical substances, and
articles which are to be conveyed across the sea. Such paper can also be advan-
tageously employed for the manufacture of imitation leather, and in the production
of wall paper, as the glossy surface is not injured by damp and cannot be dissolved
by washing, which advantages are not possessed by ordinary chromo-paper.
In carrying out this process, paper of ordinary quality, or of low value, is first
coated with a solution of size, glue, or gelatine, in which the filling matter, for
example, blanc-fixe paste (that is to say; precipitated moist barium-sulphate),
china-clay, or the like, with or without the addition of suitable mineral or organic
colours or dyes, is held in suspension or solution.
To the surface so prepared a highly diluted solution (one to two per cent.) of
chrome alum, or other chromic compound is applied, and the paper thus treated
is exposed to light. By this means not only is the size, glue, or gelatine, fixed
and rendered insoluble in water, but the coating is prevented from assuming a
greenish tinge as heretofore, which can only be removed by bleaching
In order to produce a highly lustrous paper, a larger quantity of china clay or
blanc-fixe is added to the gelatine solution, and in addition thereto the prepared
paper is subjected to the glazing action of brushes or calenders either before or
after being treated with the chromic compound. The proportions of the above-
mentioned materials may be varied according to circumstances, but the following
will be found to give good results:-For paper with a dull glaze:-One part by
weight of size, glue, or gelatine, ten parts of water, four parts of china clay alone
or mixed with colouring matter, and sixteen parts of blanc-fixe paste; and for
paper with a high finish, the glaze of which is brought out by brushing or calender-
ing, a larger proportion of blanc-fixe paste according to requirements.
Paper so prepared will not lose either its gloss or its colour in the presence of
moisture and may even be cleaned with a sponge and soap; hence it is peculiarly
suited to the manufacture of all kinds of paper articles of clothing, whether white,
coloured, or pattern goods, as it is not affected by perspiration or other moisture
and does not adhere, but preserves its colour and gloss, even when cleaned in the
same way as indiarubber articles of clothing.

page_text: Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, I declare that what
I claim is:
-
The process for the production of waterproof and washable glazed chromo-paper,
the distinguishing feature of which is that the paper is first coated with a solution
of size, glue, or gelatine, containing blanc-fixe paste or china-clay with or without
the addition of mineral or organic colouring matter, and is then treated with a
weak solution of chrome alum or other chromic acid compound, and finally exposed
to the action of light, thereby producing an insoluble combination of the resulting
chrome-gelatine with the filling and colouring material rendering the paper
impervious to moisture without detracting from its quality of being glazed and
calendered in the ordinary way, substantially as described.
T. SCHIFFER,
Per W. H. Beck,
115, Cannon Street, London, E.C., Agent.
Lun max GTT HOT