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Патент USA US3023192

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Fell 27, 1962
Filed Jan. 19, 1959
itcti ltaes mm tiic
Patented Feb‘. 727, 19%2
'erably subjected to heat treatment including hot drawing,
thereof. The ?bers spun from the above spinning solu
tions in accordance with the invention contain by weight
from 0.01% to 10% sulfo-group sulfur in order that the
?bers have good dyeability and other properties.
vAn especially preferred practice of the invention com—
and to acetalization - to further improve the properties
Kenichi Tanabe and Yasuji Olino, Kurashiki City, Japan,
assignors of three-fourths to Kurashiki Rayon Co., Ltd.,
Okayama Prefecture, Japan, a corporation of Japan,
and one-fourth to Air Reduction Company, Incorpo
rated, New York, N. ., a corporation of New York
Filed Jan. 19, 1959, Ser. No. 787,386 '
Claims priority, application Japan Jan. 18, 1958
Claims. (Cl. 260--29.6)
prises forming ?bers from spinning‘solutions containing
water-soluble polyvinyl alcohol which has been acetalized
10 with a sulfo-group containing aldehyde or acetal thereof.
Other sulio-group containing polymers can also be used
This invention relates to polyvinyl alcohol ?bers hav
ing improved dyeability.
vin the invention as will be more fully described herein
It is well-known that ?bers of'hydroxylated', polymers
In a preferred practice of the invention, polyvinyl alco
such as‘polyvinyl alcohol or- hydrolyzedrcopolymers of 15 hol containing at least 70'mol percent vinyl alcohol, is'ace
vinyl esters with minor amounts of polyme'rizable vinyl or
talized by reaction with a sulfo-group containing aldehyde
vinylidene'compounds can be obtained by dry or' wet
or acetal. Speci?c examples of suitable sulfo-containing
aldehydes include aliphatic ,aldehydes such as sulfoacet
spinning from aqueous solutions thereof. However, such
?bers show undesirable sensitivity to water, especially in
hot water. T The ?bers generally shrink more than 10%
of their length in water at room temperatures, and dissolve
in hot water at 70-90° C.
aldehyde (formyl methane sulfonic acid), disulfoacetalde
hyde, a-sulfopropionaldehyde, ' B-sulfopropionaldehyde,
B-sulfobutyraldehyde, 'y-sulfobuytraldehyde, a,a-dimethy1
~?-sulfopropionaldehyde, 'y-sulfovaleraldehyde, w-sulfonon
In order to improve the properties of the ?bers, the spun
ylaldehyde, and the like, as well as aromatic aldehydes
?bers are usually subjected to a heat treatment at tempera
such as ortho-, meta-, and par-a-sulfobenzaldehyde, 2,4-di
tures invthe range of 200—250° C. followed by acetaliza 25 sulfobenzaldehyde, 3,5-disulfobenzaldehyde, sulfonap‘m
tion with formaldehyde. By heat treatment the wet soft
thaldehyde, and the like. »Acetals of the above aldehydes
ening temperature of the ?bers, that is the temperature at
which the ?bers shrink 10% of their length when im
mersed for 30 minutes in water, can be raised to 60-110°
C. If after heat treatment the ?bers are furtherv reacted
with formaldehyde the wet softening temperature can be
raised to 100-130“ C. and the ?bers do not dissolve in
150° C. water. Fibers so treated have su?icient wet heat
resistance for practical uses.
including methyl, ethyl, propyl, butyl, and the like can be
The sulfo aldehydes or acetals are reacted with the poly
vinyl alcohol in the presence of, a mineral acid catalyst.
Examples of suitable catalysts include sulfuric acid, hydro
chloric acid, phosphoric acid, nitric acid, and the like.v It
is generally preferable to carry out the reaction in aqueous
Other solvents such as alcohols can be em
A disadvantage of polyvinyl alcohol ?bers treated as 35 ployed. The acetalization can be carried out by dispers
above indicated is that these ?bers have poor dyeability.
ing powdered polymer in an aqueous salt solution con
Untreated polyvinyl alcohol ?bers may have dyeability
taining mineral acid and the suite-aldehyde or acetal.
similar'to cellulose ?bers with direct colors due to the
Usually acetalization temperatures in the range of 40-90“
presence of hydroxyl groups, but heat treatment adversely
C. and acetalization times of 1-60 hours are suitable al
a?ects dyeability with’ direct colors such that after heat 40 though temperatures and times outside these ranges can
treatment the dyeability is ahnost the same or poorer than
be used. The polyvinyl alcohol polymer to be sulfo
that of cotton ?bers. By acetalization after heat treat
acetalized should contain at least 70 mol percent vinyl
ment, the dyeability with direct colors usually decreases
alcohol units. The polymer may comprise partially sa
further as a result of the reaction of accessible hydroxyl
ggro'ups. Dye absorption of heat treated and acetalized
poni?ed polyvinyl acetate, or polyvinyl alcohol partially
acetalized with a monoaldehyde. The polymer may com
polyvinyl alcohol ?bers with respect to direct colors is 45 prise the saponi?cation product of a copolymer of vinyl
usually about 30—80% that of cotton.
. acetate with comonomers such as acrylonitrile, vinyl chlo
Polyvinyl alcohol ?bers which are acetalized in aqueous
ride, vinylidene chloride, methyl acrylate, methacrylic
solution directly after being spun without intermediate
acid, and the like. It is generally preferred to acetalize
heat treatment, have good a?inity for direct dyes. This
540% of the vinyl alcohol units with the sulfo-aldehyde.
is_.believed due to the increase in accessible hydroxyl
Although sulfo-acetalized polyvinyl alcohol alone can
groups resulting from swelling of the ?bers during acetali
. be spun in accordance with the invention to prepare the
zation, which increase more than o?’sets blocking of hy~
improved ?bers, it is preferred to blend the sulfo-acetalized
droxyl groups as a result of acetalization. However, the
polymer with a major amount of straight polyvinyl alcohol
wet softening temperature of the ?bers is usually below
and spin this blend to form the novel ?bers of the inven
about 60° C. and the ?bers shrink considerably in boiling 55 _ tion. Fibers spun from the blend of sulfo-acetalized poly
Water and become gelatinous and sticky. If the degree of
vinyl alcohol and untreated polyvinyl alcohol generally
'acetalization is increased, the at?nity for direct dyes de
have better mechanical properties and wet heat resistance
creases greatly while the resistance to shrinkage in boiling
after further processing steps.
water is still poor.
After sulfo-acetalization and prior to spinning the min
It is an object of this invention to provide polyvinyl al
eral acid is usually neutralized and removed from the
cohol ?bers having improved dyeability.
acetalized polyvinyl alcohol by dialysis. Alternatively,
Other objects of the invention will be apparent from
the following speci?cation and claims.
however, the acid may be neutralized and the resulting salt
left in the spinning solution. Fibers produced by wet
In accordance with the present invention, polyvinyl al 65 spinning salt-containing spinning solutions have more cir
i cohol ?bers having improved dyeability are prepared from
a polyvinyl alcohol spinning solution having incorporated
cular cross-section.
In addition to the above-described practice of the in
vention, the invention can also be carried out by spinning
polyvinyl alcohol blended with other water soluble sulfo
, therein a water~soluble, sulfo-group containing polymeric
,. material. The said’ spinning solution is spun into ?bers in
accordance with wet or dry spinning techniques to form 70 group containing polymers.
the improved ?bers of the invention. The ?bers are pref
Examples of such additional
sulfo-polymers include vinyl sulfonic acid polymers and
copolymers of vinyl sulfonic acid with'comonomers such
as acrylonitrile, vinyl chloride, acrylic acid, methacrylic
acid, and the like, said copolymcrs containing at least
5 mol percent vinyl sulfonic acid radicals. Other sulfo
polymers which may be used include polymers prepared
by acetalizing polyvinyl alcohol with a haloaldehyde or
acetal and reacting the resulting polymer with sodium
sul?te, sodium acid sul?te, or sodium thiosulfate. Also
for 7 hours with agitation. After the reaction, the excess
acid was neutralized with caustic soda, and the solution
was dialyzed by parchment paper in ?owing water for
3 days. The solution was then concentrated to obtain
polymer in ?lm form. The polymer had a degree of
acetalization of 23.5% and contained by weight 6.38%
A spinning solution was formed by dissolving 14.4 g.
of the acetalized polyvinyl alcohol and 120.6 g. of straight
polymers such as vinyl alcohol-allylchloride copolymers
polyvinyl alcohol in water to form a solution containing
with sodium sul?te, sodium acid sul?te, or sodium thio 10 15% by weight polymer. The solution was wet spun to
sulfate can be used. The sulfo-group containing polymers
form ?bers. The ?bers were heat treated and subsequent
polymers prepared by reacting allylchloride-containing
are blended with untreated polyvinyl alcohol to form a
homogeneous aqueous spinning solution. The sulfo
polymer is used in amount such that ?bers formed from
ly treated in an aqueous solution containing by weight 5%
formaldehyde, 15% sulfuric acid and 15% sodium sul
the blend contain 0.01—l0% by weight sulfo-group sulfur. 15 fate at 70° C. for 1 hour. The resulting ?bers contained
0.61% sulfur. The fibers were transparent and had a
The polymer blend is composed of a major amount of
cross section upon microscopic examination.
polyvinyl alcohol, preferably about (30-95% by weight
The ?bers had 10 mg./ g. dyeing affinity and dyed beau
polyvinyl alcohol.
tifully when dyed in a bath containing by weight of the
Polyvinyl alcohol which is used in the invention is a
2% direct dyestutf Nippon Fast Violet BB. By
linear synthetic polymer consisting of at least about 98%
way of comparison, a polyvinyl alcohol ?ber prepared
vinyl alcohol units, -'-CH2-‘-CHOH—-. Polyvinyl alco
similarly but containing no sulfur had 2.0 mg./ g. dyeing
hol having a degree of polymerization greater than 800
affinity. The ?bers of the invention were dyed with basic
and preferably in the range 1000-3000 is employed.
such as Rhodamine B andBismark brown and
The sulfo-group containing polymeric spinning solution
showed clear color tone. Where the ?bers are ?rst dipped
is spun by extruding the aqueous solution through small 25 in
an aqueous solution of polyethylenepolyamine having
holes in a spinning jet into a medium effective to remove
degree of polymerizationvand dyed, they had good
water therefrom. In wet spinning processes said medium
dyeability for direct and acid dyestuffs. The dyeability
is usually a concentrated aqueous solution of a coagulat
of straight polyvinyl alcohol ?bers where treated similarly
ing salt such as sodium sulfate or ammonium sulfate while
with polyethylenepolyamine was not substantially im
in dry spinning techniques air or an inert gas such as
nitrogen is employed. Suitable spinning conditions for
preparing the sulfo-group containing ?bers of this inven
Example II
tion are described, for example, in 11.5. Patent 2,642,333
An aqueous solution containing 120 g. of the same
and in Tomonari et a1. application Serial No. 336,166
polyvinyl alcohol used in Example I, 84 g. of ?-sulfo
filed February 10, 1953, now Patent No. 2,988,802.
propionaldehyde dimethylacetal, and 1676 g. of water
The ?bers are preferably stretched to a draw ratio of
about 2:1 to 12:1 during or after spinning. For wet spun
?laments, the stretching can be carried out directly after
was heated at 70° C. for 26 hours.
The solution was
treated as described in Example I to obtain a polymer
?lm. The polymer so obtained had a 25.6% degree of
spinning while the ?bers are Wet at room temperature up
to 100° C. to a draw ratio of about 5:1. For stretching 40 acetalization and contained 6.57% sulfur.
12.2 g. of the acetalized polyvinyl alcohol and 37.8
to higher draw ratios, it is preferred to conduct the stretch
g. of straight polyvinyl alcohol were dissolved in water
ing in a heated medium such as air at 100~250° C.
to form a 15% polymer spinning solution. The solution
The oriented ?bers are heat treated to improve the wet
was Wet-spun to form ?bers which contained 1.60% sul
heat resistance thereof. The heat treatment is usually
fur. After heat treatment, the ?bers were acetalized in
carried out by heating the ?bers in a medium such as
air at 210-2500 C. for 2 seconds to 5 minutes.
Subsequently, the ?bers containing 0.01 to 10% by
weight sulfa-group sulfur can be acetalized by reaction
with a mono- or dialdehyde having up to about 20 carbon
an aqueous bath containing by weight 5% formaldehyde,
12% sulfuric acid, and 15% sodium sulfate at 70° C.
for 1 hour.
The ?bers were nearly transparent and had uniform
atoms until about 5-50% of the vinyl alcohol groups have 50 cross-section. The ?bers dyed beautifully with direct
dyestuffs and showed improved dyeing affinity to basic
been acetalized. vThe acetalization is conveniently car
dyestuffs similarly as shown in Example 1.
ried out in an aqueous solution containing 02-10% alde
hyde, 5—20% sulfuric acid and 0~25% sodium sulfate or
Example 111
ammonium sulfate at temperatures of 40-80° C. for times
ranging from a few minutes, e.g. 10 minutes, to several 55
An aqueous solution consisting of 2.4 kg. of polyvinyl
hours, e.g.' 5 hours. Examples of suitable mono- and di
alcohol having a mean degree of polymerization of about
aldehydes which can be used are formaldehyde, benzalde
1500, 2 kg. sulfuric acid, 5.6 kg. of 28.5% aqueous solu
\hyde, glyoxal, propionaldehyde, butyraldehyde, valeralde
tion of ?-sulfobutyraldehyde and 30 kg. of water was
hyde, and the like.
heated to 60° C. for 30 hours. The acetalized polyvinyl
Practice of the present invention results in the produc— 60 alcohol had a degree of acetalization of 21.0% and con
tion of ?bers which have good dyeability for direct and
tained 5.84% sulfur. After the acetalization, the acid
basic dyestuffs. The ?bers are substantially transparent
in the solution was exactly neutralized by the addition of
and have substantially uniform cross section. Addition
a 10% solution of caustic soda without dialysis. To the
ally, the ?bers have ion-exchange properties and are thus
resulting solution was added 35 kg. of straight polyvinyl
useful as ion-exchangers.
alcohol, and water was added to adjust the polymer con
The ?ber of the invention can be pretreated with poly
centration to 15% by weight.
amines such as polyethyleneamine thereby to increase the
The solution was wet-spun and the resulting ?bers were
a?inity thereof to acid dyestu?s.
heat treated and then acetalized at 60° C. for one-half
The following examples illustrate the invention.
70 hour in an aqueous bath containing by weight 0.2%
terephthaldehyde, 2% sulfuric acid and 10% sodium
Example I
sulfate. The resulting ?ber contained 0.355% sulfur by
An aqueous solution containing by weight 6% poly
weight and had a uniform, almost circular cross-section.
vinyl alcohol which had a mean degree of polymerization
The '?ber could be dyed beautifully as the ?ber in Ex
of 1600, 6% sulfuric acid, and 4% of the sodium salt
ample II.
‘of sulfo'acetaldehyde dimethyl acetal was heated a‘t'70" C.
Example IV
About 100 g. of a polymer comprised of 94 mol per
cent vinyl alcohol and 6 mol percent allylchloride was
admixed with 400 g. of an aqueous solution containing
15% sodium sul?te and the mixture was heated for 24
hours. After reaction, the mixture was dialyzed in ?ow
ing water by cellophane to remove unreacted substances.
The solution was then concentrated to recover the poly
solution was neutralized with caustic soda and dialyzed
in ?owing water for 3 days. The solution was concen
trated to recover polymer. The polymer contained
6.03% sulfur by weight.
About 10 g. of the above polymer and 110 g. of un
treated polyvinyl alcohol were dissolved in water to ob
' tain a 15% by weight polymer solution. This solution
was wet spun and the resulting ?bers heat-treated and
mer. The polymer contained 0.8% sulfur
formalized to obtain product ?bers having 0.45% by
The polymer obtained as above described in amount 10 weight sulfur which had good dyeability similar to those
of 54 g. was mixed with 96 g. of polyvinyl alcohol having
of the preceding examples.
1600 degree of polymerization and the mixture diluted
We claim:
with water to form a 15% polymer spinning solution.
1. A spinning solution effective to produce ?bers of
The solution was wet spun to produce ?bers containing
desirable characteristics particularly with respect to dye
0.29% by weight sulfur. These ?bers had good dye
ability after heat treatment and acetalization.
Example V
About 20 g. of sodium polyvinyl sulfonate having about
ability which comprises water containing dissolved therein
I polyvinyl alcohol and a water-soluble sulfo-group con
taining vinyl polymer, the amount of sulfo-group sulfur
being 0.01 to 10% of the total polymer weight.
2. A spinning solution effective to produce ?bers of
500 degree of polymerization was admixed with 130 g. 20 desirable characteristics particularly with respect to dye
of polyvinyl alcohol and the mixture Was diluted with
ability which comprises polyvinyl alcohol and a water
water to about 16% by weight polymer. This solution
soluble sulfo-acetalized polyvinyl alcohol, the amount of
was wet spun by extrusion into substantially saturated
sulfa-group sulfur being 0.01 to 10% of the total polymer
sodium sulfate solution. The resulting ?bers contained
3.25% sulfur. The ?bers were heat-treated and formal-; 25
3. A spinning solution effective to produce ?bers of
ized. The thusly obtained ?bers had considerably more
desirablecharacteristics particularly with'respect to dye
uniform cross section than straight polyvinyl alcohol
ability which comprises polyvinyl alcohol and a water
?bers, and had good dyeability to direct dyestuffs.
soluble sulfa-acetalized polyvinyl alcohol, the-amount of
sulr'o-group sulfur being 0.01 to 10% of the total polymer
Example VI
weight, 5 to 50% of the vinyl alcohol units in the com
To an aqueous solution containing about 20% by
bined polymers being acetalized by reaction with an alde
weight sodium sul?te was added B-chloropropionaldehyde,
hyde having up to 20 carbon atoms.
and the mixture was heated to obtain a water-soluble
4. A polyvinyl alcohol ?ber consisting of a polymer
polymer containing sulfo-groups, the formula of which
blend of polyvinyl alcohol and a water-soluble sulfo—
was not de?nitely known. The polymer was dialyzed in
group containing vinyl polymer, the amount of sulfo
?owing water by parchment paper and the solution was
sulfur being 0.01 to 10% of the total ?ber weight.
concentrated to recover a hygroscopic polymer, which
5. A polyvinyl alcohol ?ber consisting of a polymer
polymer contained 8.10% sulfur.
blend of polyvinyl alcohol and water-soluble sulfo~
About 120 g. of the polymer and 480 g. of 1600 degree
polyvinyl alcohol, the amount of sulfo-group
of polymerization polyvinyl alcohol were dissolved in
sulfur being 0.01 to 10% of the total ?ber weight.
water to form a 16% by weight of polymer solution.
6. A polyvinyl alcohol ?ber consisting of a polymer
The solution was wet spun and the resulting ?bers were
of polyvinyl alcohol and water-soluble sulfo
heat-treated and formalized. Transparent ?bers contain
polyvinyl alcohol, the amount of sulVfo-group
ing 1.62% sulfur and having good dyeability to direct and
45 sulfur being 0.01 to 10% based on vthe weight of poly
basic dyestu?s were obtained. ’
vinyl alcohol and sulfa-acetalized polyvinyl alcohol, 5
Example VII
The sulfoacetalized polyvinyl alcohol of Example I
in amount of 22 g. and 378 g. of straight polyvinyl alcohol
to 50% of the vinyl alcohol units in the said polymer
blend being acetalized by reaction with an aldehyde hav
ing up to 20 carbon atoms.
were dissolved in water to obtain an aqueous solution 50
containing 30% polymer. The solution was dry spun to
form ?bers containing 0.34% by weight sulfur. After
heat treatment and formalization, the ?bers had good dye
ability to direct and basic dyestuffs.
Example VIII
References Cited in the ?le of this patent
Dreyfus ______________ __ Ian. 31, 1939
Nelles _______________ _.. Nov. 3, 1942
Tornonari _________ _..'___ June 16, 1933
, 2,749,208
Cline ________________ __ June 5, 1956
polymer of vinyl alcohol and vinyl chloride having a
mean degree of polymerization of about 800, the copoly
mer containing 85.3 mol percent vinyl alcohol and 14.7 60 2,895,786
mol percent vinyl chloride, 5% sulfuric acid, and 4.3%
Estes _________________ .__ Feb. 4, 1958
Suyama _____________ .__ June 16, 1959
Schlack ______________ _. July 21, 1959
An aqueous solution containing by weight 6% of a co
of the sodium salt of B-sulfobenzaldehyde was heated at
60° C. for 6 hours with agitation. After reaction, the
Carpenter, G. B., Wheeler, 0. L.: “Textile Research
Journal,” April 1956, pp. 317-322.
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