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Патент USA US2406749

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2,406,749
Patented Sept. 3, 1946
r
uNi'rEo STATES PATENTIOFFICE I
SIZING COMPOSITION AND YARN SIZED I
THEREWITH
Harry R. Dittmar, Wilmington, Del., assignor to
E. I. du Pont de Nemours & Company, Wil
mington, Del., a corporation of Delaware
No Drawing. Application August 4, 1943,
_
Serial No. 497,366
20 Claims. v(Cl. 260-—32)
1
2
This invention relates to a sizing composition
to be understood that the invention is not re
stricted to the specific details thereof, the parts,
and yarn sized therewith. More particularly,
this invention relates to a sizing composition
proportions and percentages being by weight:
suitable for nylon yarns intended for the knitting
Example I
of full-fashioned hosiery, and nylon yarn sized 5
A size composition of .the following ingredients
therewith.
I
in the proportions set forth is prepared in any
It is known that the proper sizing of nylon
yarn for use in the knitting of full-fashioned
hosiery is a very critical operation. The basic
requirements include ( 1) good knitting perform 10
ance, even at high humidities, (2) good stitch
formation, (3) no marked tendency of edge-roll
ing of the flat fabric since this makes seaming
slow and expensive, and (4) excellent snag-resist
ance of the fabric throughout the several process
ing steps. One of the most successful of the
sizing compositions available for nylon yarns is
that described in U. S. patent of Edgar W.
Spanagel, No. 2,324,601, issued'Juily 2U,
convenient manner:
-
>
-
,
Parts
Polyvinyl alcohol-boric acid ______________ __
5
Polydioxolane sebacate _____- _____________ __
5
Water _________________________________ __
90
In the polydioxolane sebacate, the ratio of com
bined sebacic acid to'combined 1,3-dioxolane is
1:8, and the compound has a molecular weight 7
of about 1500 and a hydroxyl number of 61.7.
Single ends of 30 denier-1G ?lament-3O turn
polyhexamethylene adipamide yarn is sized in
and
conventional fashion with this composition to
which consists of partially hydrolyzed polyvinyl 20 give a final yarn having 3.6% size and dried at
acetate (known in the trade as polyvinyl alcohol)
80° F. and 50% relative humidity for 9 hours.
modi?ed with a substantialbut minor propor
tion of 'boricac'id. 'Even this composition gives
quite poor knitting performance under conditions
The yarn is twist-set in ovens at a dry bulb of
170° F. and a wet bulb of 165° F. for 2 hours, and
thereafter conditioned at 72% relative humidity
This turns out to be a serious 25 for 10 hours. It is ?nally coned, using a typical
matter since high humidities prevail along the
coning oil for nylon. It is knitted using a 45
eastern seaboard for a considerable part of the
g’auge, single-end Wildman ?at knitting machine,
year. Moreover, since it is good practicein knit
the yarn being conditioned at 100% relative hu
ting full-fashioned hosiery from silk to well hu
' midity as knitting proceeds. The yarn runs very
of high humidity.
midify the yarn at the moment of knitting by 30 well through the knitting machine, leaving prac
passing it over a wick laden with water or through
a chamber at 100% humidity, there is a strong
tendency to do the vsame when Working with
tically no deposit on the needles and latches even
after
several
days’
operation. ‘The
knitted
stitches are well formed. The flat fabric remains
nylon yarn. The resultis that the ability to knit " substantially ?at so that the seaming operation
well at high humidities without depositing size
proceeds in a manner fully equal to the experience
on or fouling the knitting needles becomes the
with natural‘ ‘silk. Overall mill performance
?rst criterion of a good knitting size.
shows a small percentage of pulled stitches due
It is an object of, this invention to provide an
to. snagging.
_
improved sizing composition for nylon yarn to
'
Example II ‘
be used for the knitting of full-fashioned hosiery. 40
A composition of the following ingredients in
Another object of this'invention is to provide
“the proportions set forth is prepared in any con
sized nylon yarn that will'give good knitting
venient manner:
performance even under conditions of high hu
Parts
midity. A speci?c object of this invention is to
improve the polyvinyl alcohol-boric acid size so
that nylon yarn sized therewith will knit Well
even at high humidities without depositing size
on or fouling the needles or sinkers of the knitting
machine. Other and additional objects will be
Polyvinyl alcohol-boric acid ______________ __
6
Polydioxolane adipate ___________________ __
4 ‘
Water _________________________________ __
90
In the polydioxolane adipate, the ratio of com
bined adipic acid to combined 1,3-dioxolane is
come apparent hereafter.
'
_
50 1:10, and the compound has a molecular weight
The objects of the invention are accomplished,
of about 1190 and a hydroxyl number of 66.7.
ingeneral, by modifying a polyvinyl alcohol-boric
30 denier->10 ?lament-30 turn polyhexamethyl
acid size by incorporating therein a modi?ed poly
ene adipamide yarn is sized, dried, twist-set, con
mer of dioxolane. 'The following examples are
ditioned, coned and knitted as set forth in Exam
typical embodiments of the invention, and it is 55 ple I. During knitting, the running qualities of
2,406,749
3
.
4
.
‘with polyvinyl alcohol-boric acid size , (without
shown for a speci?c partially saponi?ed vinyl
acetate which is soluble or emulsiflable in water
the modi?ed dioxolane polymer) with no sacri?ce
in either the edge-rolling Characteristics or the
alcohol. The invention, however, is not restricted
this sized yarn are superior to nylon yarn sized
snag-resistance.
and which is known in the trade‘ as polyvinyl
to such speci?c polyvinyl alcohol. Generally
speaking,- any‘ water-sensitive polyvinyl com
pound in which 1% .to 50%, and preferably 35%
to 50%, of the carbon atoms in the polyvinyl
_
Example III
- r A composition of the following ingredients in
the proportions set forth is prepared in any con
venient manner:
chain are attached to hydroxyl groups (such
10 compounds being herein referred to as “hydroxy
-
Parts
Polyvinyl alcohol-boric acid ____________ __
3.5
Polydioxolane stearate __________________ __
2.5
lated polyvinyl resin”) can be used. As illustra
tive examples of hydroxylated polyvinyl resins
which can be used are the partial esters of \poly
Water
94.0
vinyl alcohol such as the partial acetates, the
In the polydioxolane stearate, the ratio of com 15 partial-propionates, the glycolic acid esters, the
partial formates, and the partial lactates; the
binedv stearic acid to combined 1,3-'dioxolane is
partial ethers of polyvinyl alcohol such as the
1:8, and the compound has a molecular Weight
glycol ethers, the glycolic acid ethers, the methyl
of about 1200 and a hydroxyl number of 59.
ethers, and the ethyl ethers; the partial acetals
Single ends of 30 denier-10 ?lament-30 turn
polyhexamethylene adipamide are sized, dried, 20 of polyvinyl alcohol such as the partial formal,
the partial?acetal, the partial glyoxal, the partial
twist-set, conditioned "and coned as set forth in
Example I. The yarn is then‘ knit as set forth in
Example I except that the yarn is conditioned
for knitting at a relative‘humidity of 50%, which
propional, and the partial .butyral; the partial
ketals of polyvinyl alcohol such as the ethyl
methyl ketal.
.
I
is typical of certain parts of the year along the 25 Although partially saponi?ed polyvinyl acetates
having saponi?cation numbers from 40 to 150 are
eastern seaboard. Completely satisfactory per
formance results.
~
The polyvinyl alcohol-boric acid of each of the
above examples is a partially saponi?ed polyvinyl
particularly useful, partially saponi?ed polyvinyl
acetates having saponi?cation numbers of between
10 and‘300, such as 40 to 200, or even somewhat
. acetate (known in the trade as polyvinyl alcohol) 30 lower than 10 or higher than 300, may be used
having a 'saponi?cation number of 140 and a
viscosity of 4 centipoises, modi?ed with 20% boric
acid based on the polyvinyl alcohol.
Though the examples refer to speci?c modi?ed
to advantage. Saponi?cation numbers of the
partially saponi?ed polyvinyl acetate, as used
herein, .are de?ned as the number of milligrams
of potassium hydroxide required to completely
.
polymers of dioxolane, the invention is not re 35 saponify 1 gram of the sample.
The partially saponi?ed polyvinyl acetate may
stricted thereto. There may also be used poly»
have viscosities of 1.5 to 20 centipoises, and pref
mers of dioxolane modi?ed by other monobasic
erably 4 to 6 centipoises, the viscosity being de
or polybasic carboxylic acids or esters thereof and
termined on'a 4% aqueous solution at 20° C.
prepared, for example, by (1) effecting the poly
merization of the dioxolane in the presence of 40 using a Hoeppler viscosimeter.
In general,'the amount of boric acid can vary
carboxylic acid, using a strong acid such as. sul
within wide limits. The maximum ‘quantity of
furic acid for the catalyst; (2) first polymerizing
boric depends on the characteristics of the par
thedioxolane in the presence of a strong acid
ticular hydroxylated polyvinyl resin and is suf
such as sulfuric acid and then reacting it with
an ester of the carboxylic acid, using an alkaline 45 ?cient to insure good running properties but in
sufficient to cause gelation. Although particularly
catalyst to obtain an alcoholysis reaction; and
desirable results are obtained when the boric acid
»(3) ?rst reacting dioxolane with the carboxylic
constitutes approximately 20% to 22.5% of the
acid to obtain a lower molecular weight polymer
weight of the polyvinyl alcohol, the amount of
than desired and then subjecting this polymer .to
further reaction with dioxolaneyto obtain a higher 50 boric acid can vary between 5% and 25% based
on the weight of the polyvinyl alcohol, the limit
molecular weight polymer. Similarly, substituted
depending on the characteristics of the particular
dioxolanes may be used as a starting material,
polyvinyl alcohol and being, on the one hand,
and these include such compounds as the 2-ethyl
su?icient to insure good running properties and,
and the 2,2-dimethyl 1,3-dioxolane. In general,
the molecular weight of the modi?ed dioxolane 55 on the other hand, insufficient to cause gelation.
When formals of polyvinyl alcohol containing
polymer should be within the range of 500 ‘to
10% to 30% of formal constitute the hydrpxylated
1500. The ratio of combined acid to the dioxolane
polyvinyl alcohol, the amount of ‘boric acid may
may vary within quite wide limits. It will .be
vary from 5% to 20% based on the weight of the
obvious to one skilled in the art that if the ratio
.
of the acid, such as stearic acid, becomes too 60 formal.
The proportions of the polyvinyl hydroxylated
large, the resulting polymer will not be soluble in
resin-boric acid composition to the dioxolane
Similarly, if the ratio of the acid is not
' water.
polymer may be varied within limits. In most
properly chosen, the resulting polymer will not
cases, proportions of 50:50 seem to give optimum
be a solid. The ratio within which water-solu
bility and a solid state is developed varies with 65 results, but quite satisfactory results are' secured
within the limits of 65:35 and 35:65.
the particular acid involved and is readily ascer
It is true that the polyvinyl alcohol-boric acid
tainable by experiment. In every case, the di
composition by itself is quite a remarkable size
oxolane polymer intended for use with this in
for nylon yarn in terms of edge-rolling preven
vention should be a low-melting, waxy solid
‘70 tion and snag-resistance but its running char
which is soluble in the water.
For a more detailed discussion of the method
- of preparation of these modi?ed polymers of di
' oxolane, reference may be had to copending ap
acteristics at high humidities, as has been pre- .
viously noted, are‘not at all satisfactory. The di
oxolanepolymers by themselves have no special
sizing value and have extremely poor snag-re
plication Serial No, 395,366, ?led May 2'7, 1941.
In the-foregoing examples, preference has been 75 sistance. It is quite surprising that they can so
/ 2,406,749
.
’
5
»
6
materially improve the running qualities of the
polyvinyl alcohol-boric acid composition without
impairing the edge-rolling characteristics and the
snag-resistance.
.
-
Even when knitting at high relative humidities,’
as is commonly done, or when knitting at uncon
trolled humidities which sometimes show great
'
variations from day to day or even from hour to '
It will be obvious to one skilled in the art that 5 hour in some parts of the eastern seaboard, the
the sizing compositions of this invention can be
composition of this invention assures regular and
applied by conventional methods from an aqueous
excellent knitting with no fouling of the knitting
solution or dispersion of any desirable concentra
needles or “sinkers and no perceptible wear on the
tion to yield on the yarn a coating of any reason
needles, even after several days of operation. It
able thickness. Solutions of 2% to 12% total 10 is difficult to de?ne the excellence of the knitting
solids content are preferred, depending, as .is
performance in mathematical language, but it
known, on such factors as the denier and ?lament
can be stated that the sizing composition of this
count of the yarn, its water-sensitivity, the rate
invention gives as good knitting performance at
of travel of the yarn through the sizing bath, the
100% humidity as the best previous compositions
temperature of the bath and of the drying condi 15 gave with dry knitting.
tions and the amount of size desired on the yarn.
The subsequent process steps can be easily car
It will be obvious too that the amount of size de
ried out and the percentage of damaged stockings
sired on the yarn will vary with these or similar
materially decreased. The invention involves no
‘factors. Generally, a coating on the yarn of from
new equipment or altered techniques. The con
1% to 6% is preferred.‘
- .
20 trol of the edge-r0lling of the ?at fabric is also en
For reasons of simplicity, the invention has
tirely satisfactory, as can be seen from a seam
been discussed speci?cally in terms of polyhexa
ing time for 100 stockings of 80 minutes, compared
methylene adipamide yarn since that is the com
with 98 minutes with the best previous composi
mon nylon yarn of the'market. The invention.
tion knit dry as against the knitting according
obviously embraces other synthetic linear poly 25 to this invention at 100% humidity. The protec
amide yarns as well as related synthetic linear
tion of the fabric against snagging and pulled
polymer yarns, such, for example, as those de
threads during the subsequent processing steps is
rived from polymerizable mono amino carboxylic
quite satisfactory, taking into consideration the
acids or, their amide-forming derivatives and
excellent knitting performance. Based on ‘,000
vthose derived from the reaction of suitable di 30 stockings carried through knitting, seaming, boil
amines with suitable dicarboxylic acids or amide
o?‘, boarding and drying, the compositions of this
.forming derivatives of dibasic carboxylic acids,
invention show 10% to 14% pulled threads asv
disclosed in U. S. Patents Nos. 2,071,250, 2,130,523
against 0% to 20% for the best previous sizing
and 2,130,948. Without limiting the broad and
composition, i. e. polyvinyl alcohol-boric acid. It
general de?nitions of nylon as used elsewhere in 35 might be interesting to note in passing that when
patents or literature, the synthetic linear poly
these modi?ed polymers of dioxolane are used by
amides herein disclosed are de?ned as set forth themselves, the percentage of pulled threads wa
in U. S. Patent 2,359,877, i. e. a synthetic linear
61 %, an intolerable situation.
'
polycarbonamide wherein the average number of
‘As a matter of fact, the resistance of workers
carbons in the segments of the chain separating
to working on nylon stockings in view» of_ their
the amide groups is at least two.
inherent difficulties compared with silk has been
The invention is additionally applicable to any I ?nally overcome. Signi?cant to the public is the
water-insensitive synthetic linear polymer yarn,
fact that the cost of stockings bears a close re
since the compositions employed in this inven
lationship to the percentage of stockings made
tion adhere well to these yarns in contrast to the 4 Di that cannot leave the factory because of pulled
more well-known compositions. ‘By the term
threads or snagging in the processing. One'of ‘
“water-insensitive,” it is meant that the indi
the attributes of this invention is that this per
vidual ?laments of the yarn absorb less than 10%
centage is materially decreased.
of their weight of water at 25° C. and 100% rela
Since it is obvious that many changes and mod
tive humidity. Examples of such polymers are 50 i?cations can be made in the above-described de
the vinyl chloride-vinyl acetate interpolymers,
tails without departing from the nature and spirit
of the invention, it is to be understood that the
polymerized methyl methacrylate or polymerized
'ethyl methacrylate, polyvinyl chloride, chlori
, nated polyvinyl chloride, high molecular weight
ethylene polymers, vinyl chloride-vinylidene chlo
ride copolymers, and acrylonitrile and copolymers
thereof.
_
The invention has special value in connection
with the knitting of full-fashioned ‘hosiery since
that involves very ?ne and delicate yarns, care
' invention is not to be limitedthereto except as
set forth in the appended claims.
55
I claim:
’
1. A yarn-sizing composition comprising a
water-sensitive hydroxylated polyvinyl‘ resin,
boric acid and a polymer of the class which con—
sists of modi?ed polymers of dioxolane and alkyl
60v substituted dioxolanes, said polymer being a
ful knitting, the problem of edge-rolling of the
‘water-soluble waxy solid having a molecular
?at fabricwith the difficulty of seaming, and the
weight within the ‘range of 500 to 1500 and modi
chances of snagged and pulled threads inherent ‘ ?ed by a member of the class which consists of
in the many processing steps. The composition of
carboxylic acids and esters thereof, the ratio of
the invention is basically an excellent knitting size 65 the total amount of said hydroxylated resin and
for“ water-insensitive yarns, as discussed, and
boric acid to the amount of said polymer being‘
equally useful for circular knitting of similar. or
within the limits of 65 I35 and 35:65.
heavy fabrics from similar or heavy dem'er'yarns,
2. A yam-sizing composition comprising an
including mono?ls, and also may be used to ad
aqueous solution of a water-sensitive hydrox
vantage with other structures, such as ?lms, staple 70 ylated polyvinyl resin, boric acid and a polymer
?ber, spun yarn, mixed yarn, ribbons, etc.
of the class which consists of modi?ed polymers
j By reason, of the invention, the expeditious 4 of dioxolane and alkyl substituted dioxolanes,
- knitting of nylon 'yarns into such critical fabrics
said polymer being a water-soluble waxy solid
' " as full-fashioned hosiery is more fully assured.
having a molecular weight within the range of 500
Orderly and ‘more regular knitting is maintained. 75 to 1500 and modi?ed by a member of the class
2,406,749 A
which consists of carboxylic acids and esters
thereof, the ratio of the total amount of said hydroxylated polyvinyl resin and boric acid to the
amount of said polymer being within the limits of
65:35 and 35:65, and the boric acid being present 5
hydroxyl number of 59 and a ratio of combined
stearic acid to combined 1,3-dioxolane of 1:8, the
ratio of the total amount of said polyvinyl acetate
and boric acid to the amount of said polydioxolane
stearate being within the limits of 65:35 and
35:65.
in an amount of from 5% to 25% based on the
11. A water-insensitive yarn having a size coat
weight of the hydroxylated polyvinyl resin.
ing comprising a water-sensitive hydroxylated
- 3. A yam-sizing composition comprising a par
polyvinyl resin, boric acid and a polymer of the
tially saponi?ed polyvinyl acetate, boric acid and
a polymer of the class which consists of modi?ed 10 class which consists of modi?ed polymers of di
oxolane and alkyl substituted dioxolanes, said
polymers of dioxol‘ane and alkyl substituted d1
polymer being a water-soluble waxy solid, having
oxolanes, said polymer being a water-soluble waxy
a molecular weight within the range of 500 to
solid and having a molecular weight within the
1500, and modi?ed by a member of the class which
range of 500 to 1500 and modified by a member of
the class which consists of carboxylic acids and 15 consists of carboxylic acids and esters thereof, the
ratio of the total amount of said hydroxylated
esters thereof, the ratio of the total amount of
resin and boric acid to the amount of said poly
said polyvinyl acetate and boric acidv to the
mer being within the limits of 65:35 and 35:65.
amount of said polymer being within the limits
12. A water-insensitive yarn having a size coat
of 65:35 and 35:65.
4.. A yam-sizing composition comprising a par 20 ing comprising a. water-sensitive hydroxylated
polyvinyl resin, boric acid and a polymer of the
tially saponi?ed polyvinyl acetate, boric acid and
class which consists of modi?ed polymers of di
a polymer of the class which consists of modi?ed
oxolane and alkyl substituted dioxolanes, said
polymers of dioxolane and alkyl substituted di
polymer being a water-soluble waxy solid, hav
oxolanes, said polymer being a water-soluble waxy
solid having a molecular weight within the range 25 ing a molecular weight within the range of 500
to 1500, and modified by a member of the class
of 500 to 1500 and modi?ed by a member of the
which consists of carboxylic acids and esters
class which consists of carboxylic acids and esters
thereof, the ratio of the total amount of said hy
thereof, the ratio of the total amount of said poly
droxylated polyvinyl resin and boric acid to the
vinyl acetate and boric acid to the amount of said
polymer being ‘within the limits of 65:35 and 30 amount of said polymer being within the limits of
65:35 and 35:65, and the boric acid being present
35:65, and the boric acid being present in an
in an amount of from 5% to 25% based on the
amount of from 5% to 25% based on theweight
weight of the hydroxylated polyvinyl resin.
‘ of the polyvinyl acetate.
5. A yarn-sizing composition comprising a par
13. A water-insensitive yarn having a size coat
tially saponi?ed polyvinyl acetate, boric acid and 35 ing comprising a partially saponi?ed polyvinyl
polydioxolane sebacate, the ratio of the total
amount of said polyvinyl acetate and boric acid to
_ the amount of said polydioxolane sebacate being
within the limits of 65:35 and 35 : 65.
acetate, boric acid and a polymer of the class
which consists of modi?ed polymers of dioxolane
and alkyl‘substituted dioxolanes, said polymer
being a water-soluble'waxy solid, having a mo
6. A yarn-sizing composition comprising a par 40 lecular weight within the range of 500 to 1500,
and modi?ed by a member of the class which con
tially saponi?ed polyvinyl acetate, boric acid and
polydioxolane sebacate, said polydioxolane seba
sists of carboxylic acids and esters thereof, the
sebacate being within the limits of 65:35 and
acetate, boric acid and a‘ polymerof the class
which consists of modi?ed polymers of dioxolane
ratio of the total amount of said polyvinyl acetate
cate having a molecular weight of about 1500, a
and boric acid to the amount of said polymer be
hydroxyl number of 61.7 and a ratio of combined
sebacic acid to combined 1,3-dioxolane 01’ 1:8, the 45 ing within the limits of 65:35 and 35:65.
14. A water-insensitive yarn having a size coat-,
ratio of the total amount of said polyvinyl acetate
ing comprising a partially saponi?ed polyvinyl
and boric acid to the amount of said polydioxolane
35:65.
-
7. A yarn-sizing composition comprising a par
50 and alkyl substituted dioxolanes, said polymer
'being a water-soluble waxy solid, having a mo
lecular weight within the range of ,500 to_1500,
and modi?ed by a member of the class which con
amount of said polyvinyl acetate and boric acid
sists of carboxylic acids and esters thereof, the
to the amount of said polydioxolane adipate being
55 ratio of the total amount of said polyvinyl acetate
‘Within the limits of 65:35 and 35:65.
tially saponi?ed polyvinyl acetate, boric acid and
polydioxolane adipate, the ratio 7 of the total
8. A yarn-sizing composition comprising a par‘;
tially saponi?ed polyvinyl acetate, boric acid and
polydioxolane adipate, said polydioxolane adipate
_ and boric acid to the amount of said polymer be
ing Within the limits of 65:35 and 35:65, and the
boric acid being present in an amount of from 5%
to 25% based on the weight of the hydroxylated
having a molecular weight of about 1100, a hy
droxyl number of 66.7 and a‘ ratio of combined 6o polyvinyl resin.
15. A yarn formed of a synthetic linear polycar
adipic acid to combined 1,3-di'oxolane of 1:10, the
bonamide
wherein the average number of carbons
ratio of the total amount of said polyvinyl acetate
in the segments of the chain separating the amide
and boric acid to the amount of said polydioxolane
groups is at least two and having a size coating
gdipate being within the limits of 65:35 and 65 comprising
a water-sensitive hydroxylated poly
5:65.
vinyl resin, boric acid and a polymer of the class
9. A yarn-sizing composition comprising a par
tially saponi?ed polyvinyl acetate, boric acid and , which consists of modi?ed polymers of dioxolane
and alkyl substituted dioxolanes, said polymer
polydioxolane stearate, the ratio of the total
being a water-soluble waxy solid and having a
amount of said polyvinyl acetate and boric acid
to the amount of said polydioxolane stearate be _ 70 molecular weight within the range 'of 500 to 1500
and modi?ed by a, member of the class which con
ing within the limits of 65:35 and 35:65..
10. A yarn -sizing composition comprising a par
I sists of carboxylic acids and esters thereof, the
ratio of the total amount of said polyvinyl resin
tially saponi?ed polyvinyl acetate,lboric acid and
polydioxolane stearate, said polydioxolane stea - and boric acid to the amount of said polymer be
rate having a molecular weight of about 1200, a 75 ing within the limits of 65:35 and 35:65, and the
“2,406,749
9
10
v
- boric acid being present in an amount of from
5% to 25% based on the weight of the hydrox
yiated polyvinyl resin.
v5% to 25% based on the weight of the polyvinyl
_
acetate.
.
-
-
_> 18. A yarn formed of a synthetic linear poly
16. A yarn formed of a synthetic linear poly
carbonamide wherein the average number of car
bons in the segments of the chain separating the
amide groups is at least two and having a size
coating comprising a‘partially saponi?ed poly
carbonamide wherein the average number of car
bons in the segments of the chain separating the
amide groups is at least two and having a size
coating comprising a partially saponi?ed polyvinyl
acetate, boric‘acid- and polydioxolane sebacate,
vinyl acetate, boric acid and a polymer of the ,class ' the ratio of the total amount of said polyvinyl
which consists of modi?ed polymers of dioxolane 10 acetate and boric acid to the amount of said poly
and alkyl substituted dioxolanes‘, said polymer
dioxolane ‘ sebacate being within the limits of
being a water-soluble waxy solid, having a, mo
65:35 and 35:65.
lecular weight within the range of 506 to 1500,‘
and modi?ed by a member of the class which con
_
v
-
19. A yarn formed of a synthetic linear poly-y
carbonamide wherein the average number of car
sists of carboxylic acids and esters thereof, the 15 bons in the segments of» the chain separating the
ratio of the total amount of said polyvinyl acetate
and boric acid to the amount of said polymer be
coating comprising a partially saponi?ed polyvinyl
.ing within the limits of 65:35 and 35:65.
acetate, boric acid and polydioxolane adipate, the
/
>
17. A yarn formed of a synthetic linear poly
amide groups is atdeast two and having a size
ratio of the total amount of said polyvinyl acetate
carbonamide wherein the average number of car 20 andboric acid to the amountof said polydioxolane
bons in the segments of the chain separating the
adipate being within the _limits of 65:35 and
amide groups is at least two and having a size I
coating comprising a partially saponi?ed polyvinyl .
35265.
‘ ~
20. A yarn formed of a synthetic linear poly~
acetate, boric acid and a poiymer,of the class
carbonamide wherein the average number of car
which consists of modi?ed polymers of dioxolane - 25 bons in the segments of the chain separating the
and alkyl substituted. dioxolanes, said polymer
amide groups is at least two and having a size
being a water-soluble 'waxy solid, having a mo
lecular weight within the range of 7500 to 1500,
and modi?ed by a member of the class which
. coating comprising a partially saponi?ed polyvinyl
.acetate, boric acid and polydioxolane-stearate,
the ratio of the total amount of said polyvinyl ace
consists of carboxylic acids and esters thereof, the 30 tate and boric acid to the amount of said p0ly~
ratio of the total mount of said polyvinyl acetate
dioxolane stearate being within thev limits of
and boric acid to the amount of said polymer be
65:35 and 35:65.
‘
ing within the limits of 65:35 and 35:65, and the
boric acid being present in an amount of from
v-
'
HARRY R. DI'I'I'MAR.
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