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Cd. 22, 1946-
w. H. MCDOWELL
2,409,984
METHOD OF TREATING WATER RESISTANT PAPER
FiledIMay 15 ,' 1945
WENDELL H. MCDOWELL
INVENTOR
Blawzi
A
RNEYS
Patented Oct. 22, 1946
2,409,984
UNITED‘ STATES PATENT OFFICE "
» 2,409,984
time» or TREATING WATER
RESISTANT PAPER ,.
'
Wendell n. ‘McDowell, Rochester, N. Y.,_ assignor
'
to Eastman Kodak Company, Rochester, N. Y.,
a corporation of New Jersey
Application May 15,1945, Serial No. 593,829
'
‘6 Claims.
(01.117-62) '
2
This invention relates to a ‘method of treating
which decrease the advantages in the use of such
meltI_-.:coated,-water resistant paper‘ in which
a procedure. In other cases where thermoplastic ‘
the~melt coating of the paper is treated with only I , sheeting has exhibited sticking, thin layers of
enough of a lower monohydroxy alcohol to‘wet
cellulose esterslfrom solution‘ of the esters in
volatile solvents have been applied thereto. In
the present situation this merely adds to the
weight of the photographic paper and also pre
the surface ,ofthe ‘coating and is‘ then‘evaporated
I
therefrom.v '
Recently ‘the coating of’ paper with hot fluid
melts 'consistln'g‘of ‘a cellulose ester and a plas- “
'>
sents'other difficulties, such as the effect of the "
ticizer‘ has ‘become-of interest, particularly for.
volatile'solvents on the melt coating which has
the preparation of water resistant paper suitable 10 already been applied. Therefore, none of the
for photographic purposes. This melt coated
methods which has previously been considered
paper is described in U. S. application, Serial No. .
for ‘cellulose ester ‘sheeting have been regarded
553,804 vof Hollis T. Galley, ?led September 12, _ _ with too much favor for inhibiting the adhesive
1944,<"and in ."UQSI applications, Serial Nos. f ness of melt coatings.
.15. ‘One object of my invention is to provide a '
Novemberwz7; v19“i'3"which have vmatured into ‘- method of treating melt coated paper so as to
PatentsNos'i25387?73 and 2,387,774. ‘In, the use. ' prevent sticking of that paper to hot metal dry
of photographic paper for picture making it ‘is _ ing surfaces. Another object of my invention is “
oftenwdesjirable 'arter'a ‘photographic print has, ‘ to provide a method of treating melt coated paper
been developed, fixed, and washed to pass it over 20 .to inhibit sticking of that material to hot surfaces,
512,051v and-512,052 ofv‘salo' ‘and. Vivian, ?led
hot meta'l'i'drying surfaces such‘ as‘ heatedjtoa,
. which method does not increase the weight or
temperatureof $200~'-260° F. whéreb‘yI'the photo+
alter the surface characteristics of the melt coat
graphic". paper is‘ quickly dried, thus k say
ing. '_A further object of my invention is to‘pro
and contributing to the quality ‘of?the pro’
, vide a simple, easily operated method of treating
melt coated paper to‘ decrease its sticking proper
obtained. 1As long “as-the hot surfaces ‘are 'main
taine'dbelow the melting temperature of the coat-' . _ '
ping, drying of ' the} ordinary-type photographic
paper'by this ‘means is very‘ satisfactory. ,
In those cases, however, where‘ melt 'coated
‘paper has ‘been employed‘ as the s'up‘portrfor a
ties.’
"
‘
-
I have found that melt coated paper which’is
dampenedjor slightly wetted with a lower ali
so
phatic alcohol, which alcohol is then evaporated
therefrom provides a surface which will not stick
photographic emulsion,‘ it has‘ been found that'
to hot metal'drying surfaces such as are ordin
sticking of the paper to the hot metal surface '
arily employed in drying photographic prints or
in ferrotyping operations. In its broadest aspects
may .occur in the drying operation.’ The melti
coated ‘water resistant paper ordinarily contains
a coating of cellulose acetate'buty-rate plasticized
my invention comprises the treatment of paper
which has been melt coated on at least one surface
_ ‘with a small amount of alcohol, on that surface,
with ,a ‘stable, high-boiling material‘, such, for ,
instancejas a mixture of dibutyl' ‘sebacate and jliwhich‘ is preferablyapplied only‘ inl an amount,
butylstearate or of di-2l-e‘thyl heiiyl-phthala‘te» ,1 j f-insu?icientto run off the same. ‘ The melt coated
and butyl stearate. Becauseof'th'e natureof this
paper thesurface of the melt coating of which ‘
coated material‘, methods‘ of‘ drying‘ the'fp'hoto
is thus dampened‘with the alcohol is preferably
graphlr? paper less convenient "than the use of " almost immediately treated to drive off the alco
hot surfaces have beennece‘ssaryg
Heretofore where ‘thermoplastic sheeting has ‘
exhibited sticking properties, such as upoi'r bind?
ing that material together for shipping-or‘ stor
, age, it has been suggested that ,if'the surface
of the sheeting was roughened or microscopically
pitted, sticking would not occur. Although
hol such as by passage of the so-dampened paper
through a heated chamber. The surface so
‘treated will not become tacky' upon1 contacting ‘ '
45 with a‘ hot metal drying surface such as having
a temperature of 200-260° F. and no adhesion to
‘I the metal takes place. In the process inaccord
ance with my invention only enough alcohol is
methods of this nature might be useful for some’
employed to wet the surface and, therefore, there
typesof thermoplastic sheeting, the presence of 50 is no substantial washing out of any of the mate
a roughened surface on photographic paper is
rials which are present such as would occur by an‘
not particularly desirable. Other methods such ‘ immersion operation.
, ,
.
as heating the paper in a hot chamber and then i
One procedure which‘might suggestitself as
cooling, prior to packing. have been considered.
3 being remedial of the sticking characteristics of
However, in practice, di?iculties are‘ met with
_ _
melt coated paper would be to employ a melt coat
3,409,984
3
ing composition in which tne amount of plasti
cizer employed is reduced to the barest minimum
understood that other .icwervalicbatir at ‘alt
may be employed for this
This, however, introduces di?lculties into. the melt
monohydrq
coating operation, as the presence of suil‘icient
‘.alinhaticwal ,
atoms being ‘especially:
plasticizer to insure a .good melt is necessary for li
is
of'removallqfthaalaéahol;
ordinarily desirable to 1%,..2192 methy-l
.. or
,
' the efficient and speedy coating of pape__r_._ With
,the use of restricted amounts of 'plasticizer the
a1c°hii<zrthis ailment.“
.. ,,
speed of the coating operation is restricted in that >
The following; example illustratesmy invention;
drying lines appear onpaper at certain speeds, if
.f’aper whit, had'beenbama coated earner;
the melt is notlof the most desirable type. 'My
, process as adaptable to preventing ‘the, sticking‘
mated on bath-slate with a. hat malt-swine OI" v
of melt coatedpapers even though theyamo'unt of
' pIasticizerT employed in the melt coating’ (ID-Q17?
hutyl stearat'é'Las vre'scribled 121158410
'
qellulose acetate butyrater siiblltri sebac
8,1,}?
ation has been as much as 50% basedupqlithe
cellulose ester which is employed in the melt com-r7
position.»
.
"
.
Vivisij
‘
‘
e'antx'abrrtae be'ins. ~11‘!
,
tra dEDYIthB'QFQWmU ‘at tea-application, The
Ordinarily paper is wmelt coated with. a 09m!
‘position consisting of cellulose acetate butyrate
Panel? 1 ispassedbet teen press re1l>1jaadapp1 sea‘
‘tor roll 3.; the side
having a high butyryl content, such as a butyryl;
Plncamrrouheinsthatwho
The applicatorrallédinsimoa‘boar
is of
- content of 50% and asubstantial proportion of va
plasticizer which is suii'iciently solventof the celé,
ethyl‘ alcohol ~55 contained-iii the‘ yessere .
Peri 4 and ‘in turn maidens-the"surfaces;L ,
lulose ester to form a good meltibutcwhich will
not give, tackiness after the ‘melt- coating has
melt coating whichit contacts.
‘I
cooled. A good example of a composition ‘useful,’
‘like enclosed chamber in‘l-wni'chtthe amlitatcr 1»;
for melt coatingis a mixture of acellulose acetate .25.
was
is found
maintained
and throughwhich
‘at a temperature
thevpaperf.or 160480?‘
butyrate having‘ a‘ butyryl content or approx
imately 47%, ‘and 331/3%, 'basedon the weight of
F- by the passaseor' a
org-warm
3-‘
the cellulose ester, of a plasticizer consisting of
therethroueh
nearer
centainiee
three parts of dibutyl' sebacate and. two parts of
hol was jacketed- and ‘cool wat .
butyl stearate. 'Thisfcomposition is heated to a
temperature of 16_O—l70° Qandmay beapplied to
'30
through’ the jacket to, minimize. e,
' alcohol from the ‘hopper.
.
-
Forty-.twothQusand feet qf'paner-?-l/z
paper in any desired manner giving agood coat
ing thereon. For instance, the melt coating may
be applied by'a bead application in'which the
were put- >thr0ush . the i anpliaator whi
proximately
melt-coated
400surface,‘
munda- Aim
efaalwhal
moistaninz. lathe
., ..
"
, paper after coatingis run over a blade tor-smooth .35; thev
ing purposes while still in a plastiocondition. '
applicator the paper- was almostimmediateir
freed of alcohol duerlto the: warm" aircirculatinit *
The paper which is thus coated may _ either ‘have
been ?rst baryta coated or thejmeltcoating may
have been applied ?rst, followed by the appli
cation of a baryta coating thereto.
’
‘ in the chamber within-which :theitreatmentitooh ‘
place.
i
1
The alcohol treatment'may be imparted to the
melt coated, water resistant {paper either before,
during, or after the applicationlof a photosensi
tive emulsion thereto. ‘For instance, after a paper
has been melt coated‘theipaper may be passed
_ through a heated chamber, 511611338 heated to 190oi
,
.
of the paper contaqting?therqll.
_onto' the paper'and-almost immediately evapor
ated therefrom. In order toincrease' the speed so
coated, both thecoating operation and theevap
crating ‘operation may take place within the
heated chamber for: the sake of convenience“
After the paper'has been treated with. alcohol
‘
v
‘as;
metalfermtypingyrfil'lt the-a1 whol-treatedgliside
F., in which chamber the alcohol is ?owed out
of removal of the alcohol from the paper thus
.i
The paper ,was then; coated-7.912 the‘hamte '
1e papendried
readilrwithout' stickineto themetal' suriace.
Instead-0f‘ applyingithe anchor-bathe bead ' '
method, it
be. applied; by; any‘, methodiaby
which ‘the surface of the melt
, tened ‘with, the alcohol;
‘
,suchx-as'by
coatingilis"
"?owing,
mois'e
or" , * h
spraying the alcohol onjtoa rapidlymovink?ria ,
'
Per
Sheet whichrhas been-melt coated: These. ';
in accordance with my process photographic 55, plication
or alcohol maybe separated tram the
emulsion may-be applied-thereto, preferably?on
the side of the paper to which the alcohol has not ‘
been applied (providing only one side of the,
vpaper was
treated)’.
'
If the‘photographic emu-l;
_
V
’
sion had first-been applied to :the paperv before, or
simultaneously with the alcohol-treatment, it is
ready after evaporation of the valcohol therefrom
for use for photographic purposes. ,After the
drying. or evaporating-means, {tbe-paaer-in-thw
caseartemhe application-ot-tne-caloohdltbeinej: '
, led , into evamtetins-cQnditima.
rne-acehqis preferred tor-g
vvare-'- thdae- Qt? -
fairlyhigh concentration such as93elllo°h aloe-1*
hol; ' However, more dilute alcohol mayher-eonv
ployed‘lwithinthe 'sconei-oi'cur intention; The _'
water, howeyervidilutes t eialcohoiv andsthus
paper has been‘exposed, it may then be developed,v
the-handlingandethel'évaporationxbt 1 I
?xed, and washed’ in the conventional manner '‘ Tanecessitates
largerrquantity'of liquid, than~ iri-thosacases l '
whereupon it maybe passed over a hot metal sur-=
wherelaymore.concentrated-alcoholisused. ‘Asa -' ‘t:
face such as a metal drum having a temperature‘
of 200a260° F., the side of they paper which had
general rule , the- alcohol employedxshouldf'be':rota: -
at least 80°: concentration.
been treatedwith the alcohol being contacted with
The ,amount of alcohol; which is-appliedlto/the
’ the hot metal.‘ The paper which had been treated 70
surface of the melt-coatinsfifheedom cbe'f'su?lfé
in accordance with my invention readily dries and
' cient to dampencr‘moisten thatsurfacer Great;
falls awayi'rom the hot metal surface with‘which
it contacts. 7'
Although the invention has been ‘described us
" ing ethyl alcohol as the wetting liquid, it is to be
_1
'V
;
er quantities will tend to run oil’ ot'thejpaper ii‘
‘and would be uneconomical-in the excessive insect. I‘. I‘
alcohol. I have found, that-‘the.applicatioa‘iot
" 2-4 pounds of alcoholyper IOOQ'square- feetv of f‘ "
7
' ’
.
2,409,984
paper is the best range for operation although
the treatment of the surface with alcohol and
evaporation thereafter is within the purview of
my invention.
My invention includes not only the treatment
of the melt-coated surface of paper with alcohol
but also the evaporation of the alcohol therefrom.
In practical operation it is desirable to subject
6
the same. and evaporating the alcohol from that ‘
surface.
3. A method of preventing melt coated paper
from stickingttophot drying surfaces which com
prises treating the surface of the paper contain
ing a melt coating of cellulose acetate butyrate
and a plasticizer thereon with only sufficient low
er monohydroxy aliphatic alcohol of 1-4 carbon
the paper to an elevated temperature, such as
atoms to wet the same and evaporating the alco
by means of a current of warm air to accomplish 10 hol from the surface of the coating.
the removal of the alcohol fairly rapidly. Where
4. A method of preventing melt coated paper
‘ time is not of importance the drying or removal
from sticking to hot drying surfaces which com
of the alcohol may be accomplished as desired,
prises treating the surface of the paper con
such as by exposing the treated paper to the air
taining a melt coating of cellulose acetate bu
for the desired time. Any drying operation com
tyrate and a plasticiz'er thereon with only suffi
patible with the conditions here may be employed
cient ethyl alcohol to wet the same and evaporat
for the evaporation of the alcohol from the sur
ing the alcohol from that surface.
face moistened therewith.
5. A method of treating melt-coated paper,
I claim:
which has been baryta coated and then melt
1. A method of treating the surface of paper.
coated with a mixture of cellulose butyrate and
‘containing a melt coating of a cellulose ester
a plasticizer which comprises treating the sur
and a plasticizer to inhibit tackiness when con
face which has not been baryta coated with only
tacted with a hot surface which comprises con
sufficient ethyl alcohol to wet the same and
tacting at least one surface of paper melt coated
\ evaporating the alcohol from that surface.
with a mixture of a cellulose ester and a plas
6. A method of treating the surface of paper
ticizer with only sufficient alcohol of 1-4 car
containing a melt coating of a cellulose ester and
bon atoms to wet the same; and evaporating
a plasticizer to inhibit tackiness when contacted
the alcohol from that surface.
with a hot surface,’ which comprises contact
2. A method of treating at least one surface
ing at least one surface of paper melt coated with
of paper containing a melt coating of a cellu 30 a'mixture of a cellulose ester and'a plasticizer '
lose ester and a plasticizer which comprises con
with only sufficient _methyl‘ alcohol to wet the
tacting at least one surface of paper melt-coated
same. and then evaporating the alcohol from that
with a mixture of a cellulose ester and‘ a plas
’ surface.’
'
ticizer with only sufficient'e'thyl alcohol to wet
WENDELL H. MCDOWELL.
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