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Патент USA US2122774

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atented July 5‘, 1938
Shinjiro Horii, Kanda-ku, Tokyo, Japan
No Drawing. Application May '1, 1937, Serial
‘ _No. 141,249. In Japan April ii, 1937
4 Claims. (01. 4'1—38.6)'
of extremely fine porous structure. Specially
prepared forms of wood. charcoal, commercially
This invention relates to improvements in sten
cil sheets for'use in duplicating manuscript or
known as “perit” or “norit” etc. may be employed
typewritten documents, drawings and the like,
consisting of a sheet ‘of ?brous material provided
with' a coating which is impermeable to ink and
may be cut through by the type of a writing ma
chine or by a stylus.
independently or in conjunction with hydrosili
The amorphous and porous
structure of the adsorbent materials mix and
bond well with the material containing proteins
and oily softening agents, and, consequently, tend
to maintain the homogeneity of the coating, to 0
give the excellent ?nish of increased hardness and
flexibility and to improve the cutting of the coated
sheet, producing clear and even writings by the
. cate or silica gel.
Heretofore it has, been proposed to prepare a
stencil sheet consisting of a porous base, such as
' 0 Yoshino paper, coated with a material including
~ a gelatinous organic colloid, dispersed in an aque
. ous medium, an oily softening agent and an in
of a writing machine.
organic body capable of forming colloid sols in pressure
In carrying out the invention a gelatine of high
the disperse medium and which prevent sweating I jelly strength is swelled by soaking in water and, 15
15 out of the oily softening agent.
afterward, is dissolved in hot water. The solu
Ithas also been proposed to prepare a stencil tion is then mixed and emulsi?ed with Turkey
sheet provided with a coating of coagulated or red oil and other suitable oily softening agents,
non-coagulated gelatine, having homogeneously such as fatty oils, fatty acid esters, mineral oils,
dispersed therethrough an oily softening agent oleic acid, oleyl alcohol and an active adsorbent
20 and an organic ?ller, such as beeohwood '?our,
which prevent sweating out of its ingredients.
In the present invention the stencil sheets are
prepared by coating the sheets of a ?brous base,
such as Japanese Yoshino paper, with a coating
25 material comprising a gelatinous organic colloid,
such as gelatine, dispersed in water, an oily
softening agent and an active adsorbent mate
material, such as hydrosilicate or silica gel, in ad
mixture with dyes or pigments. To the compo
sition there is added a small amount of a suitable
solvent, such as cyclohexanol, a hardening agent,
such as phenols or their derivatives.
The proportions of the ingredients of the com
position may vary according to several circum
stances. The following is an example:
The active adsorbent materials which may be
30 used in the present invention are vthe substances
having the high capacity of adsorption and pos
sessing an amorphous and porous structure in
the form of colloidal gel. Preferably, as the ac
tive adsorbent materials, (1) various kinds of
35 hydrosilicates as Japanese acid clay, silica gel and
sprouted alumina, and (2) various sorts of amor
_\hous carbon such as bone charcoal are employed.
Japanese acid and clay and fuller’s earth are the
well known hydrosilicates. The high capacity for
40- adsorption of the'hydrosilicates is principally due
Parts by weight
Gelatine _______________________________ __
Oleic acid mono- or di-glyceride _________ __
Glycol oleate ___________________________ __
Oleyl alcohol ___________________________ __
Heavy mineral oil ______________________ __
Turkey-red oil___- _______________________ __ 15
Ultramarine blue _______________________ __ 10
Activated Japanese acid clay _____________ __ 10
Silica gel ______________________________ __Y.__ 10
Water _________________________________ __ 300 40
to their intimate structure. The adsorptive ca
Cyclohexanol ____ ___ _____________________ __
Hexamethylenetetramine ____ _'_ __________ _._
pacity of the hydrosilicates is exceedingly in
Preservative -_ ___________________________ __
The basic Yoshino paper maybe coated with
ious chemical reagents such, for example, as con- , the coating material above described in any de 45
45 centrated hydrochloric acid. By the action of sired manner.
chemical reagents, certain constituents of the
What I claim is:
silicates are soluble and would tend to increase the ‘
1. A stencil sheet consisting of a base of fibrous
porosity and the adsorptive capacity of the re
material coated with a composition comprising
maining portion. The substance known in com
an organic colloid, an oily softening agent, and
creased or accelerated by the treatment with var
50 me'rce as silica gel is a hydrated form of pure _ an activated Japanese acid clay.
silica, usually containing about 18% of water.
2. A stencil sheet consisting of a base of ?brous
It is obtained by precipitating by acid from a so-v ‘ material coated with a composition comprising an
lution ofsodium silicate, and drying at moderate
temperature. It is a hard, semi-transparent,
55 glassy substance, and used in the powdered form
organic colloid, an oily softening agent and silica
3 . A stencil sheet consisting of a base c-Z?brous
ma terial coated with a composition comprising
an organic colloid, an oily softening agent, hydro
silicated and silica gel.
4. A stencil sheet consisting of a base of ?brous
ma terial coated with a composition comprising
gelatine, oleic acid glycerides, glycol oleate, ole
alcohol, heavy mineral oil, Turkey-red oil, ultra
marine blue, activated Japanese acid clay, silic
gel, water, cyclohexanol, hexamethylenetetramin
and a preservative.
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