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Патент USA US2406878

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Patented Sept. 3,1946
.
2.406.818.
'umren‘ sures "PATENT OFl-‘ICE ~
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v
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v 2,400.8;81NK
PaulWhymuliaCoi-ona,
Lo Island, N.1, “a7
HarryLlnkletten'
No
Application July
Serial No. 494.242 10, 1943,
3 Claims. ((1106-48)
1
.
This invention relates to printing inks, and ‘is
directed particularly at a new type of printing
ink, characterized by it‘s very rapid drying when
exposed to-ultra violet light.
.
, g
thod.
>
Typical of our invention are the following:
The problem ‘of drying inks rapidly has been
before the printing ink industry for a consider
Example 1.-—W0od oil varnish
able number of years, in view of the fact that
high speed printing, combined with high quality.
Lithol barium toner______ -.‘-_-.._'_ _____..;-.. 28
is desired. One group of investigators has dropped
Oil varnish
'
'
54
the typical slow drying inks made with drying 10
varnish
18
oil, and gone to an ink containing a solvent
which issubstantially non-volatile at ordinary
The oil varnish
china-wood oil.“
temperatures. but‘ which is volatilizable at tem
pertures of the order of 150° F.--see GesslerU.
S. Patent No. 2,087,190. The use of such inks re
to 70° 6., and add 5% crude di
Then add 5% liquid cobalt
The resin varnish is made as i’ollows:
quires the installation on the press of heaters to
heat the paper, and of exhaust fans to remove the
vapors and fumes coming from the printed paper,
so that, while the inks have been extremely suc
Zinc resinate
cessiul in large scale printing and in large scale
.
Per cent
47.5
operations, there still remains the desire to pro 20 Terpenol A #3N (du Pont) ............. .... 9.5
vide a quick drying ink which can be used with
are re?uxed at 110' 0., and then diluted with
out the necessity for the installation of large
amounts of equipment in connection with any
Per cent
press.
a
>
The quick drying properties of tung oil and 25
other oils containing conjugated systems of double
Solves: (petroleum distillate 0! zero di
me
yl sulfate value - bo
250-270° C.)
m rang
e
, bonds (such as dehydrated castor oil and con
33.25
jugated linseed oils) have made these oils the
5
principal attacking point for investigatorso inter
ested in producing fast "drying inks for quality 30 and smug,
printing. It'has been proposed to dry inks made
Liquid cobalt dryer................V._....
with such oils as a base by the use of ozone. and
4.75
by the use of ultra violet light. While both 01'
This ink was printed on a non-absorbent clay
these expedients increase the speed of drying of
coated carton stock, and passed through a tunnel
the ink, neither oi’ them is fast enough to cause 35 where it was exposed to a source of intense ultra
the ink to dry su?lciently for handling within the
violet light (two mercury vapor quarts lamps); _
necessary short time, of [the order of seconds.
The length 01' time of exposure in the tunnel was
We have discovered that the speed of drying
two seconds. The ink could be handled on re
oi’ oils and other binders containing conjugated
moval from the tunnel, and could be backed up
double bonds, when exposed to ultra violet light. is 40 by printing on the other side. almost immediately.
enormously accelerated by the inclusion in the
composition of a small percentage (from about 1
Example Z.—-Varnish
to 10%) of dicinnamal acetone. Inks formu
lated from oils containing conjugated double
Ester gum (glycerol-rosin ester) __________ ..- 50
bonds and a small percentage of dicinnamal ace
45
tone, in addition to the customary additions, have
been dried as on coated non-absorbent stocks with
ultra violet light in times of the order of a few
seconds.
The use of dicinnamal acetone in inks not con
much more rapidly than similar inks not con
taining dicinnarnai acetone. The drying of or
'
Tung oil
are heated at 250° C. for 20 minutes; the varnish
is reduced with
.1‘
taining binders with coniugated systems of double
bonds \does not produce such rapid drying; but
such inks, when exposed to ultra violet light, dry
Rosin
50
'
'
Pounds
Petroleum solvent of Example 1____..__._____ 44
Dicinnamal acetone..................... _.
5
when made into anink. drying as goodas that
of Example 1 is obtained. It should be noted ‘
55 that rosin
has a conjugated system oi double ‘
/
‘2,406,878
r.
bonds, and thus helps to absorb the ultra violet
energy.
.
used, provided they are press-stable, and are rap
~
-
v
_ idly volatilizable from the iilm at IOU-150° C.
Obviously, extensive changes can be made in
Elxample 3'—Vami8h
_
v
the scope of the examples, without departing from
A ‘satisfactory varnish can also be made from-f 5 the scope of the invention, which is de?ned in the
’
'I‘lln
Pounds
claims- .'
‘
-
L
'
'
_
0
1 _______ __
66
Lea: gilsinate ------- n‘ ________________ __ Z0: _
I
E
We claim:
,
_
’
‘
'
a
.
.
1- A printing ink characterized by improved
drying when exposed to ultraviolet energy, com
lggggkaulglalsogggngiiiyfgf
__________ __ 1 7% l0 prising
pigment
dispersed energy,
in a vehicle
capable of
_
being dried
by ultraviolet
and containing
The resin and‘tung oil are heated as in Exama binder having a: conjugated system, of double
ple 2--
_
_
bonds, andecontaining from about 1 to 10% of
EMZZLPZG-fP-RWW Wmwh
,,\
-
Zinc resinate-
I
_
_
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dicinnamal acetone; whereby drying by ultra vio
Pounds 15 let is substantially accelerated.
~
5°
are dissolved in__
Y
I
.
2. A‘printing ink characterized by improved
drying
when exposed to ultra viol?iia energy, com
prising pigment dispersed in a ve cle capable of
,
Cinnamic alcohol --------------- --- ----- --
The» solution is reduced with-
.
1°
"
Petroleum solvent as in Example 1 ________ __
.bemg dried by “1m violet energy, and consist
20 me at least in part of tune, oil. andcoritainine
from about 1 to 10% off‘dicinnanial" vetizme
35
Dicinnamal acetone _______ ____ ______ __>_____
whereby g drying by ultraviolet
y
.7 ishsub
a
’
accelerated.’
,
tially
V
il‘hese varnishes are used with ordinary pig3. A printing ink characterized by "
ments in the normal way to make printing ink. 25 drying when exposed to ultraviolet“
Ordinary oxidation catalysts may be added in
known
1y used manner,
to controlasprinting
may thecharacteristics;
various addants While
wide-
prising pigment dispersed in'va'vehi‘
being
at least
dried
in by
part
ultra',violet'ener‘gy
of rosin‘, andijcont mpgv
we have shown but one solvent, it has been used
about 1 to 10% of dici‘n‘nIamal,acetqneywm
only because it is representative of petroleum 30 drying by ultra violet is,substantially,accelerate
solvents
ers. A wide
whichvariety
do not of
unduly
otherattack
solvents
rubber
mayrollbe
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'_ _' ' _PA'UL1
HARRY
WHYZN'U '
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