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Патент USA US2090140

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2,090,140
Patented Aug. 17, 1937
UNITED STATES PATENT OFFICE
32,090,140
COATING COMPOSITIONS
John D. Murray, Chicago, 111., assignor to The‘
Murray‘ Liquafilm Corporation, Chicago, 111.,
a corporation of Illinois
Nd Drawing. Application March 214, 1934,
Serlal No. ‘717,275
12 Claims. (Cl. 134-117)
This invention relates to compositions for
coating paper and other sheet material, and is
herein described with reference to the provision
of a transparent protective coating for printed
5 matter and the like.
An object of the invention is to provide a com
position of the desired character which will have
a high resistance' to water and moisture, which
is not expensive, which has substantially no odor,
10 which can be applied by machinery at a high rate
of speed and still give a uniform but very'thin
coating, and which has a pleasing appearance.
I prefer also in most cases to include an ingre
_ dient which renders‘ the surface slippery, to fa
10 cilitate feeding and otherwise handling the coated
paper during subsequent operations.
A coating material which forms a coating which
is highly resistant to water and moisture includes
(dissolved in a solvent such as one or a mixture
20 of benzol, toluol, xylol, or high-?ash naphtha),
a soluble rubber compound (such as chlorinated
rubber), a plasticizer (such as tricresyl phos
Y phate, diamyl phthalate, or the like), an arti?cial
or natural resin, and a wax such as paramne.
25 I ?nd the most desirable proportions to be four
partslof the rubber compound, two and one-half
or three parts of the plasticizer, two to three parts
of theresin, and one part of the paramne. ‘ One
half part of mineral oil may, if desired, be added
30 as noted below.
This composition is‘ very advantageous where
the utmost in moisture-proo?ng is desired. On
the other'hand, while it has a high degree of
.tra'nslucence, and-in thin‘ layers is substantially.
35 ‘transparent, it has a brown color which restricts
its use for some purposes.‘
On the other hand, where a'fair degree of mois
ture resistance is su?icient, a very colorless coat
ing of pleasing appearance can be obtained by
40 dissolving, in the described solvent, processed
linseed oil or the like and blown wood oil (pref
erably three parts of the ?rst to one part of the
second), together with a cellulose compound
(preferably four parts) such as cellulose nitrate,
45 cellulose acetate, ethyl cellulose, benzyl cellulose,
or other cellulose ester.
,
'
'
For many purposes, in place of the processed
linseed oil and blown wood oil (i. e. such oils which
have been heat treated or through which air has
50 been blown until they reach a jeliylike con
proximately ten parts cellulose ester, six parts
plasticizersuch as tricresyl phosphate or diamyl
phthalate, four 'to ?ve parts of a resin such as
ester gum, 11/, parts para?lne, with 1%, parts min- ,
eral oil if desired.
‘
In most cases it is desirable to secure the utmost
in appearance, with the degree of moisture
proo?ng required, by mixing the two above sub
formulae, using as little of the ?rst composition
as necessary to give the desired degree of mois 10
ture-proo?ng.
To the'solution so obtained, as noted above,‘
there may if desired be added a very small quan
tity of water white clear mineral oil such as that
known commercially as “special American miner 15
al oil". This oil complies with the U. S. P. re
quirements‘for “White'oil” and has a ?ash point
from 380° F. to 385° F., Sayboltviscosity at 100° '
F. of 280 to 285 seconds, speci?c gravity‘ of .8871
‘to .8844 and a pour point of 0° F. This does not 20
solidify when the coating is dried by heating to
drive oil the solvent, and neither is it driven oil
with the solvent. It remains in the pores of the
dried coating, not only adding to the moisture
proof effect but also gradually oozing to the sur 25
face and keeping it somewhat slippery but with-‘
out rendering it greasy to the touch. This greatly
facilitates handling the coated sheets in subse
quent operations, as for example in feeding coated
printed blanks to packaging machinery. It also 30
adds greatly to the plasticity of‘the ?lm and re
duces' its brittleness, especially when applied to
paper.
The foliowing are examples of specific’ com
positions which I have found effective, each being 35
used with the above-described solvent:
1.
Parts
Cellulose ester __________________ _..'_ ____ __ 13
Chlorinated rubber_______....____-____....__.. 3
Tricresyl phosphate or diamyl phthalate.-- 8
Ester gum
40
5
Para?ine _____________________________ __ 1. 5
Processed linseed or wood oil ____________ .. a 6
2.
v
I Pa
' Cellulose ester_________________ _..-.._.._____ 10
Ester
gum ‘
. 5
Chlorinated vrubber __________________ __'_
3
Tricresyl phosphate or diamyl phthalate__ 5
Mineral oil (if desired) ____ __- _________ _..
3.
.
l. '15
Parts
sistency), there may be used soya bean oil, tung
Chlorinated rubber ..___...__-._____._..________
8
oil, perilla oil, castor oil, or mineral oil, similarly
processed or‘ treated.
Tricresyl phosphate or diamyl phthalate____
5
Resin such as ester gum ___________ ___ ____ __
4
Another very clear solution, which may be used
55 in place of the one just described. includes ap
Paraiiine
2
Mineral oil (if desired) -......_-----.'. ..... ..--
l
2
2,090,140
“ 4.
.
-
Parts
may use one of the lower-melting-point "plie
-
4
form" or vinyl or isoprene or other rubber-de
Processed linseed oil___.._;_____-__________
6
rivative resins. Other soluble compounds of rub
Cellulose ester
5
'
céuuloseestér
Parts
,
-
Processed unseed‘ou
Blown wood on
her and equivalent rubberlike materials may be
4
used for special purposes.
4
""""""""""" "
‘
‘
The above compositions, usually containing
2
about 50% of “solids” (1. e._ material remaining in _
g
the coating after evaporation of a the solvent),
6.
' _
Parts
10 Cellulose ester________________________ __ 4. 2
may be applied'by the method described and
claimed in my Patent No. 2,000,347, issued May 10
Tricresyl phosphate or diamyl phthalate___ 2. 5
7, 1935, being applied (preferably under pressure)
Ester gum ________ _s _____ __-_ ______ __l____ 2
as a partly-dried viscous coating which, while it
Gelled castor 011
enters the pores of the paper su?iciently to be
1.75
_Paraf?ne‘
=
___
15 Mineral oil (if desired) _________________ __
7_
‘
.25‘
thoroughly bonded thereto, does not enter the
. 25
structure of the paper enough to blur or other
Parts
wisea?'ect the ink making up the printed mat
Cellulose ester________________________ __
1o
Plasma
‘ tel‘ "11 the paper-
6
1
h 1
“312%;gi‘éve?itiptie?diii‘ii?éét‘ffaei?? ‘if;
£313,121?!‘ as ester gum""""""""""" “ ‘H1052
not my intention to limit the scope oi.’ the in
Miwal on (if desired) ________________ __
vention to ,those particular compositions,
, %
20
or
otherwise than by the terms of the appended
(Note: No. 7 solution is very‘ clear, and as ex
plained above it maybe mixed in any desired
25 proportion with one of the darker compounds
claims.
having a higher degree 01' moisture-proo?ng,
such-as No. 3 above.)
35
Parts ' position containing chlorinated rubber.
Cellulose ester
'
»
2. A composition of matter comprising four 30
2
parts chlorinated rubber, three parts plasticizer,
Processed linseed oil _____________________ __
Blown (i. e. processed) woo'd oil __________ __
3
1 -
Chlorinated
8
two parts resin, and one part wax.
3. A coating composition comprising a solvent
Tricresyl phosphate________________ ...'. ____ __
6
containing a mixture of cellulose derivative com- '
litter gum resin
4
pound oi’ the class consisting oi’ esters and ethers,
blown linseed oil, blown wood oil, chlorinated rub
Paraiiine
rubber___________ -1 _________ __
wax
'
‘
____
2
Mineral oil or desired)___y___~ __________ __‘__
1
ber, plasticizer, resin and paramne.
8
4. A coating composition consisting of a sol
vent containing a mixture of two parts cellulose
derivative compound of the class consisting of 40
esters and ethers, three parts of blown linseed oil;
one part of blown wood oil, four parts chlorinated
Chlorinated rubber_____; _________ _., ____ __-_
Tricresyl phosphate or other plasticizer_____ 5
.
.
containing cellulose derivative material of the
class consisting of esters and ethers and blown
linseed oil and blown wood oil, mixed with a com
>
.8.
30
‘
I claim:
1. A coating composition comprising a solvent 25
Estergum or otherresin ______________ _.,____
'4
_ l’aramne wax
'
Mineral oil (if desired) ____ __, ___________ __
2
1
1
rubber, three parts plasticizer, two parts resin
and one part para?ine.
'
Tricresyl phosphate _____________________ ..
'
5
2
5. ‘A coating composition comprising one part 45
of cellulose derivative material of the class con
sisting of esters and ethers, at least one fourth
part of chlorinated rubber, at least one half part
oi.’ ester gum and at least one half part of plas
ticizer oi.’ the class consisting of .tricresyl phos 50
Ester gum resin
4
phate and diamyl phthalate.
10.
_.
Parts
Chlorinated rubber _____________ -'. ______ .._ 8
Paraiiine wax
- 2
50 Mineral :oil
'u.
\
-
'
I
_
.
Chlorinated rubber _____ __I_ ______ __- ______ __
Processed oil
Para?lne war
12.
'
'
Cellulose ester
6. A coating composition comprising one part
Parts
of cellulose derivative material‘ of the class con
sisting of esters and ethers, at least one iourth
4
8
part of chlorinated rubber, at least one half part
1
oi'ester gum and at least one half part of plas
ticizer or the class consisting oi’ tricresyl phos
phate and diamyl phthalate to which has’ been
Parts
_
»
added at least one tenth part of mineral oil.‘
10
'7. A coating composition comprising one part
Ester gum or other resin___'__v _____________ _.
5
Chlorinated rubber __e ___________________ .._
3
of cellulose derivative material of the class con
Mineral 01]
2
sisting of esters and ethers, ‘at least onei’ourth
part of chlorinated-rubbeig'at least one half part
>
-
.
Plasticizer such as tricresyl phosphate_____ __
6
Para?ine wax (of relatively high melting
point)
'
2
‘
of ester gum and at least one half part of plas
ticizer of the class consisting of tricresyl phos- ,
phate and diamyl phthalate to which has been
One well-known commercial form of soluble
rubber compound which may be used in these
. formulae is the chlorinated rubber sold under the
-70 name of tornesit. Where it _is desired that the
coating-be one which will soften with heat, for
example for use in coating wrappers which are
soya bean oil.
.76 para?ine wax, instead of chlorinated rubber I
ticizer of the class consisting of tricresyl phos- *
added not more than one part blown oil‘ 01' the
class consisting of linseed oil and wood oil and
‘
,8. A coating composition comprising one part
of cellulose derivative material of‘ the class con
sisting of esters and ethers, at least one fourth
to be sealed by heating in the manner now com- '
part of chlorinated rubber, at least one half part
mon with wrappers heavily‘ vimpregnated 'with of ester gum and at least one half part of plas
l
55 I
v,
2,000,140.
3
11. A coating composition comprising thirteen
phate and dismyl phthalate to which has been.
added not less than one tenth part of para?ine parts cellulose ester, three parts chlorinated rub
wax.
her, ?ve parts ester gum and eight parts tricre
.
9. A coating composition comprising two parts
5 chlorinated rubber and one part ester gum and
at least one part piesticizer of the class consist
- m phosphate.
12. ,A coating composition comprising eight
parts chlorinated rubber, ?ve parts tricresyl phos
ing of tricreayl phosphate and- diamyl phthalate.
10. A coating composition comprising eight
phate, four parts ester gum to which has been ,
parts chlorinated rubber, ?ve pert: tricresyl
eral oil.
i0 phosphote, four parts ester gum.-
-
added two parts paramne 'wax and one part min
JOHN D. MURRAY.
10
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