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Патент USA US2412699

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17, 1946
j 2,412,699 ' “
George P. Waughand William 0. Kenyon, Rochr
ester”, N. Y., assignors to Eastman Kodak Com
pany, Rochester, N. Y.,
a corporation of New. ‘ 1;‘,
f _
Application February l2, ion,‘
N0 Drawing.
2 Claims. (01. 101F179)‘.
‘ This invention relates to a, composition emi-‘
nently suited for forming coatings on surfaces
which coatings are readily wet with water but
are resistant to removal.v
Often‘ surfaces are desirable in which upon
contact with water, thewater will spread over
the surface rather than collect together in drops
or give other evidence of ‘unevenness. Various
materials will assure an evenness of wetting with ,
water on a surface, but in all the known instances
such coatings have been more or less easily re
movable with continued washing or immersion in
One object of our invention ‘is to provide a
coating composition which can be coated upon‘
give ‘a coating readily wet wit‘
"tel-j and phys
ically resistant to soaking with water. We have
- found'that lower fatty‘ esters of.cellu1ose and ‘
particularly those acetylesters having a ‘low
acetyl content are particularly suited ‘for ‘the
purposes of our invention.
As an exampleofthe use of our invention, a
strip of Vinylite sheeting made up of a copolymer
of vinyl chloride and vinyl. acetate was coated
'by brushing thereon‘i'a‘mixture of 1 part of ethyl‘
lactate, 1 part of. methyl Cellosolve acetate and >
1 part of a 10% solution of hydrolyzedcellulose
acetate having an acetyl content of approxi-'
'mately 23,1/2% in approximately 45%‘ aqueous
ethyl alcohol.’ Thejcoating was allowed-to dry .
‘ surfaces to which uniform wetting Withwater‘is ‘ ‘at' room“ temperature.- The surface when dry
desirable. Another object of our invention is to \
was somewhat hazy. almost to‘ the point of.
provide a water-.wettable coating composition
opaqueness. ‘It was found, however, to be evenly
which-‘will result in coatings which are di?lcultly
smoothly wet‘ with water. When wet, the
removable, even though subjected to treatment‘ 20 and
coating was practically transparent, ‘and after‘
“ with water for long periods. Other objects of
drying again it was much less opaque than orig
our invention will appear herein.
. _
inally. It was found, that soaking the coating in
We have found that a solution of a far-hydro
water for a‘longperiod,such‘asatleast 40 hours,
lyzed lower fatty ester of cellulose, such as cel-‘ ‘and
drying’ did not affect‘ the quality of‘the coat
lulose acetatehaving an acyl content of ‘22-25% ‘ ing nor
did it cause the coating‘to soften so that
when dissolved in a mixture of ethyl lactate,
rubbed o?, thus“ distinguishing from
methyl Cellosolve acetate, alcohol and water may
other compositions which might form readily
be coated out ‘and the coating dried to form a ‘ wettable surfaces.
readily wettabie surface which none the less“ does
not swell, soften or disintegrate by the action 30 1. A composition adapted to form permanent
of water. We ‘have found that a composition
water-'wettable surfacesjessentially consisting of ‘ ,
comprising approximately 1 part of ethyl lactate‘;
1 part of ethyl lactate, 1 part of methyl Cellosolve ,
1 part of methyl Cellosolve acetate and from 1 to j‘ acetate,‘ and 1 to 2 parts of"‘a_ 10% solution of
2 parts of a 10% solution of the far-hydrolyzed
cellulose acetate ‘yhavin'g Lanq'acetyl content of
cellulose acetate ‘in 45% aqueous alcohol‘forms 35 22-25% in approximately§45% aqueous“ alcohol,
the ‘composition which is eminently suited for
which composition {is vadapted‘to form a coating 1
the purposes specified‘ herein.
with water but not disintegrated‘upon
The far-hydrolyzed cellulose acetate may be ' twettable
immersion therein.
prepared byvthe process ‘described. in Fordyce
8 2. A composition adapted ‘to form permanent‘; ‘ I
Patent No. 2,129,052 orain Crane Patent No.’ 40 water-fwettable ‘surfaces essentially consisting of :7 ~
' 2,327,770, the hydrolysis being continued'until
one part of ethyllactate, one part of methyl Cel- ‘
the cellulose acetate‘has an‘acetyl content of ap
acetate, and one part of;a 10% solution
proximately 23%.- This ester, if not already in
of cellulose acetate having an'acetyl content of
solution in aqueous alcohol, is dissolved therein,
22-25% _‘in approximately 45% I‘ aqueous ethyl ,
and the composition in accordance with my in 45 alcohol, which composition is adaptedto
form a
vention is formed by mixing ethyl lactate and ' coating wettable'with water but
not distinte- 1'
methyl Cellosolveacetat‘e therewith. The pro-1
‘ grated upon continued'immersion therein.
portions of the various solvents may be varied to‘
w some extent, the sole criterion being that‘a com
position is formed which upon coatingout will 50
Monomer: ‘P. WAUGH. ‘
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