JPH0765273B2 - Wax-free polyvinyl alcohol size composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to sized textile yarns having an aqueous polyvinyl alcohol composition.

Fiber sizing with polyvinyl alcohol (PVOH) is well known. PVOH with a degree of hydrolysis in the range of 87-100 mol% has been found to be practical as a sizing agent.

Essentially all spun yarn textile warp size compositions impart a lubricity during spinning and reduce both sticking to dry cans and build-up during slashing so that they are of a hydrophobic nature such as hydrogenated tallow wax. Contains waxy substance.

Also, such waxes are difficult to remove from textile products prior to finishing. Unless a special solvent extraction step is used, a high percentage of the finish spinning steps will have to tolerate a secondary quality. Often wax stains are left on the fabric and stain stains occur.

In addition, the reduced temperature of the aqueous sizing removal system, which causes another problem with wax removal, benefits the finish spinning industry.

Furthermore, when the hydrolysis of polyvinyl alcohol is less than 99%, there is always the problem of foaming during sizing.
Such problems increase as the degree of hydrolysis decreases. The presence of bubbles leads to uneven sizing and reduces yarn efficiency. Super hydrolyzed PVOH (hydrolysis degree 99-100
%) Or an antifoaming agent can be used to eliminate foaming.

However, the use of superhydrolyzed PVOH during sizing causes other problems, such as sizing of the size membrane, causing excess shedding and reduced yarn efficiency. Membrane properties and binding to fibers can be enhanced by adding polyacrylate, polyester, polyglycol and the like.

Membrane properties of partially hydrolyzed PVOH (hydrolyzed 85-96%) and binding to fibers are superior to those exhibited by superhydrolyzed PVOH. Further, because the crystallinity of PVOH is reduced, the size removal process can be performed at low temperatures, which saves energy. However, despite the above advantages,
Due to foaming during the sizing process, it was very difficult for PVOH to penetrate the size market.

Foaming of an aqueous size composition containing partially hydrolyzed PVOH is described in Colloid 694, 693 or 513, Drew Y-281, Nopco N.
It can be well overcome in many treatments by the addition of XZ L, Foammaster VL antifoams, or specific ethylene oxide-propylene oxide adducts rich in propylene oxide. However, the presence of hydrophobic wax-like substances in typical aqueous size compositions has a significant and deleterious effect on the action of the antifoams. Thus, despite the above advantages, the use of low degree of hydrolysis PVOH products in size compositions has been largely ruled out due to foaming problems.

Japanese Patent Publication No. 47-45634 is a warp size containing PVOH, a highly hydrophilic anionic surfactant and a low-foaming polypropylene glycol-ethyleneoxide adduct and / or a nonionic surfactant which is a monoester thereof. Disclosed is a method of making warp size sized treated polyamide synthetic fibers comprising treating polyamide fibers with a treatment composition.

U.S. Pat. No. 4,389,506 describes PVOH as polyglycol about 0.5-4.
Disclosed is a method of preparing a substantially dust-free PVOH powder, which comprises contacting it with a powder. According to this document, a block copolymer containing a polyethylene glycol component with a high oxyethylene content (more than 50%) propylene oxide is suitable in a narrow range as long as it does not adversely affect the end use properties of PVOH. Have said. Composition B of Example 1 represents PVOH + Pluronic F98 surfactant.

U.S. Pat. No. 4,428,751 contains a sufficient amount of textile treatment components to provide the desired effect to the textile material, and further an amount of the formula sufficient to provide foam control properties: [Wherein y is 0 or 1; m and n are both 0 to 30
However, the sum of y + m + n is at least 1; a and b are each an integer of 1 to 7; R is a C _{1 to} C ₄₀ aliphatic group; R ₁ is a C _{1 to} C ₁₆ alkyl group, C ₁ -C ₇ alkoxy, or C ₃ -C ₈ alkoxyalkyl group; and Z is hydrogen, halogen, an aqueous textile treatment liquid containing a foaming control agent and is] phosphates or phosphites, to be applied to textile materials Disclosed is a method for wet treating textile materials, which comprises:

South African Patent 712671 discloses a juice size composition containing a dilute aqueous solution of PVOH that is at least about 85% hydrolyzed and a water soluble glycol selected from the group consisting of polyethylene glycol and polypropylene glycol.

U.S. Pat. No. 3,634,295 discloses a synthetic yarn size composition containing PVOH and polyacrylic acid.

U.S. Pat. No. 3,804,785 discloses aqueous PVOH solutions containing low molecular weight amylose and / or amylitol for sizing paper and textile fibers.

U.S. Pat. No. 4,222,922 discloses a warp yarn sizing for filament yarns consisting essentially of PVOH, alkylphenoxy (or cresoxy) ethoxyethyldimethylbenzylammonium chloride and a plasticizer such as glycerol or urea.

U.S. Pat. No. 4,251,403 discloses warp yarn sizing for filament yarns consisting essentially of PVOH, urea and monosaccharides and disaccharides such as sucrose.

US Pat. No. 4,309,510 describes PVOH and amine oxide 1
Disclosed is a size composition consisting of .about.30% by weight.

U.S. Pat. No. 4,383,063 discloses a PVOH-based size composition containing a minor amount of a quaternary (eg, dialkylmethyl) ammonium salt or quaternary imidazolinium salt adduct.

U.S. Pat. No. 4,399,245 discloses a size composition consisting essentially of PVOH and polyglycerol.

The present invention essentially comprises (a) 100 parts by weight of polyvinyl alcohol that is at least 78 mol% hydrolyzed and has a viscosity of about 3-60 cps in a 4% aqueous solution at 20 ° C., and (b) a 0.1% aqueous solution at 25 ° C. Contains 4 parts by weight of a surfactant per 100 parts by weight of polyvinyl alcohol having an interfacial tension of less than 49 dynes / cm measured and a degree of hydrolysis of about 87-89 mol% and a degree of polymerization of about 1700 7. % Polyvinyl alcohol aqueous solution containing about 20 (ml foam)
There is provided a wax-free, low-foaming size composition comprising 2 to 6 parts by weight of an ethylene oxide-propylene oxide surfactant having a foaming number smaller than that of an F / g solution).

The size composition is used as an aqueous solution of about 2-20% by weight.

The addition of a specific ethylene oxide-propylene oxide surfactant to the PVOH size composition according to the present invention imparts lubricity in the yarns and removes the sized spin from the drying drum, similar to the wax containing PVOH size composition. Advantageously, a wax-free sizing agent is provided which can be facilitated, reduce shed formation during the weaving operation, enhance the weaving effect and especially facilitate the size removal process. Such advantages are obtained when the size composition is used on cotton-containing textile yarns. No clear advantage is observed for polyester synthetic yarns.

The use of ethylene oxide-propylene oxide surfactant in PVOH sizing agent
The decrease in iness) depends on the degree of hydrolysis and molecular weight of PVOH. According to the present invention, such a surfactant is
% 4% by weight in aqueous PVOH size composition (based on PVOH), where PVOH has a degree of polymerization of about 1700 and a degree of hydrolysis of 87-
The use of 90 mole% can reduce fluff by at least about 55% relative to unsized 50-50 polyester / cotton spun yarn.

It is believed that the presence of the ethylene oxide-propylene oxide surfactant improves spin encapsulation and spin penetration. That is, a size film with increased strength and reduced shed can be obtained due to adhesion and uniformity. Spinning fluff is often a measure of quality. Considering US Pat. No. 3,598,883, which states that polyoxyethylene and polyoxymethylene affect the adhesive capacity of PVOH, it is surprising that the adhesive strength is improved in the present invention.

Another embodiment of the present invention is to pass the spin through an aqueous sizing solution of the present invention, remove excess size solution from the spin, dry the sized spin, split the spin, A weaving process for the treatment of yarn, which comprises winding the yarn, weaving the yarn and removing the sizing from the textile product by washing with hot water.

According to the invention, the size composition consists essentially of the following components: (a) preferably 85-99 + mol% hydrolyzed, 20
2% to 6% by weight of ethylene oxide-propylene oxide surfactant based on PVOH having a viscosity of about 3 to about 60 mPas (cps) in a 4% aqueous solution at 4 ° C., and (b) PVOH, where the surfactant is 0.1 % Aqueous solution at 25 ° C. having a surface tension of less than 49 dynes / cm, preferably 40-48 dynes / cm.

The size composition of the present invention is a wax-free composition, that is, a composition that does not contain a hydrophobic wax substance which is common in this technical field, but has the same advantages as the wax-containing size composition. Furthermore, it is not necessary to use anionic surfactants.

If foaming of the aqueous size composition is a problem, known defoamers may be added in conventional amounts. However, in a preferred embodiment, certain ethylene oxide-propylene oxide surfactants are used that reduce foaming. Such an ethylene oxide-propylene oxide surfactant is a polyvinyl alcohol.
In a 7% aqueous PVOH solution containing 4 parts of surfactant per 100 parts, it has a foaming number of less than about 20 (ml foam F / g solution).

Suitable polyvinyl alcohols for use in the size composition are fully hydrolyzed (98-99 + mol% hydrolyzed) PVOH prepared by methanolysis of polyvinyl acetate homopolymer, and disclosed in US Pat. No. 3,689,469. At least 99.5 mol% hydrolyzed vinyl alcohol methyl methacrylate copolymer consisting of 94-98% vinyl alcohol and 2-6% by weight methyl methacrylate. Suitable partially hydrolyzed PVOH is about 85-97
It is mol% hydrolyzed, but at least 78 mol% hydrolyzed may also be used. Partially hydrolyzed PV
OH is preferred.

The ethylene oxide-propylene oxide surfactant is preferably used in an amount ranging from 3 to 5% by weight, most preferably 3.5 to 4.5% by weight, based on polyvinyl alcohol. If less than about 2% ethylene oxide-propylene oxide surfactant is used, the rate of fluff reduction is drastically worse, and at 1% or less, sticking to the drying drum becomes a problem. If more than 6% of ethylene oxide-propylene oxide surfactant is used, the fluff reduction rate will start to worsen and the integrity of the size membrane will decrease due to the poor compatibility of the two polymers.

Suitable ethylene oxide - Examples of propylene oxide surfactant is of the _{formula: HO (C 2 H 4 O} ) y (C 3 H 6 O) x (C 2 H 4 O) y H I and Wherein x and y are integers and are selected such that the oxypropylene groups account for at least 900 of the molecular weight of the compound and the oxyethylene groups account for 10-90% by weight of the compound. The surfactant represented by the first formula is a condensate of a hydrophobic base formed by condensation of propylene oxide with propylene glycol and ethylene oxide. Such a surfactant is Pluo
It is marketed by BASF Wyandotte Corp under the trademark nic. The surfactant represented by the second formula is a compound formed by adding propylene oxide to ethylenediamine and then adding ethylene oxide,
It is marketed by BASF Wyandotte Corp under the Tetronic trademark.

Furthermore, it has been found that ethylene oxide-propylene oxide surfactants in which the units of ethylene oxide and propylene oxide are reversed in the above formula are also suitable. Such inverted ethylene oxide-propylene oxide surfactants are also available in BASF Wyandot
Commercially available from te Corp.

The monoesters of the above-mentioned surfactants and C ₁ -C ₁₈ carboxylic acids are also considered to be functional or usable and are equivalent in the present invention.

Ethylene oxide-propylene oxide surfactants with a surface tension less than 49 dynes / cm are aqueous PVOH-
Use in waxless compositions allows for greater strength and reduced shed (reduction of fuzz). However, it is preferred to use a surfactant having a surface tension of about 40 to 48, in particular 43 to 47, and additionally a foam number of less than 20, preferably less than 15, most preferably 10
The use of a smaller one is more preferable because the foaming control is excellent and the defoaming agent is unnecessary.

The following techniques are used to measure the foaming number, ie the foaming degree of size aqueous solutions.

The size aqueous solution has a DP of about 1700 and a degree of hydrolysis of about 87 to 89 mol% and ethylene oxide-propylene oxide (EO-PO).
Contains 7% PVOH (based on water) with 4% surfactant (based on PVOH).

The size solution (400 g) is placed in a 1 liter beaker, equilibrated at the desired temperature, and stirred at 100 rpm for 1 hour with a 2.25 inch 45 ° pitch turbine in the center of the beaker 0.75 inch below the liquid level. The mixture is then transferred to a 1 liter graduated cylinder and the weight and volume of foamed size recorded. Foaming is calculated according to the following formula: foam density (g / ml) = PVOH size solution weight (g) / foam volume (ml) ml foam / g = (1-foam density) / foam density.

Foam is measured at 140 ° F, 150 ° F, 170 ° F and 190 ° F,
As a result, the normal processing temperature for size processing can be covered.
When plotting ml foam / g against temperature, the area under the curve in the 140-190 ° F interval corresponds to the foam number and is a measure of the foaming behavior of the size solution. The smaller the area, the smaller the foaming value and the smaller the tendency of foaming.

The PVOH-containing size composition of the present invention is used as an aqueous solution in the textile industry. That is, a size aqueous solution is generally about 2 to about 20.
It is used as a solids content of wt.%, Preferably about 5-15 wt.%, Or 2-7 wt.% If the yarn is dipped twice.

Any means and methods of physically mixing the ingredients in the aqueous medium can be used. Preferably PVOH and ethylene oxide-propylene oxide surfactants are simply added to a kettle containing water (heating). The surfactant may be physically mixed with the PVOH or the liquid may be dissolved in water after spraying the solution as a solid product onto the PVOH.

Often, starch is mixed with PVOH in a size composition. Similarly, the size composition of the present invention can be modified by the addition of other materials for use with the particular fiber, as is commonly done in sizing applications.

The temperature of the size solution is 50 ° C (122 ° F) during the sizing process.
Between 93 ° C (200 ° F), preferably 60 ° C (140 ° F) and 88 ° C
Must be between (190 ° F). The size solution is
It may be placed in either known single-volume or multi-volume boxes. After passing between the squeezing rolls to remove excess size aqueous solution, the sized yarn is about 10
It is dried by contacting it with a multi-dry can heated to 0 to 175 ° C, divided by a fixed lease rod, and wound up as a beam of weaving yarn. Slashing is performed at a speed of 10 to 100 meters / minute.

The advantageous properties of the size composition are that it does not cure on a dry can and can be torn cleanly from the lease bar without breaking the ends of the filament, making the size-spinned yarn good when put into a heddle machine. Included is the ability to split and suppress foaming in the size box when using the preferred ethylene oxide-propylene oxide surfactants.

The weaving thread may be carried out on a conventional shuttle, air jet, fine blade, or shuttleless loom. Advantageous features are the production of first-class fabrics, the efficiency of the loom, the absence of weaving machine failure due to the shed, and the ease of size removal. During finishing
The size is removed by washing with hot water. The sizes can be easily removed, especially with partially hydrolyzed PVOH, at moderate water temperatures of 50-70 ° C. There is no need to use a special solvent extraction step because the size composition does not contain wax that is difficult to remove. In other words, the wax spots that cause dyeing failure do not occur.

When the PVOH / ethylene oxide-propylene oxide surfactant waxless size composition of the present invention is used in cotton-containing textile yarn, the weaving efficiency becomes very high and the shed formation in the yarn is reduced. Weaving efficiency is essentially equal to that obtained with conventional PVOH / Tallow wax composition. Cotton-containing textile yarns include, for example, synthetic fibers such as polyesters and polyamides combined with at least 10%, preferably at least 35% cotton fibers or 100% cotton yarns.

The examples described below illustrate the invention. All parts and percentages are by weight unless otherwise noted.

The fluff is a Shirley spinning fluff measuring device / Winder 4 type E
It was measured by connecting and using pson HX-20.
The total length of the spinning used for the measurement is 50 meters. A 50 meter sample was prepared by connecting 1.5 to 2 meters of spun yarn and was used as a representative sample of sized warps.

Permeation and encapsulation data is Vers for sized spin
It was prepared by embedding in amid940 polyamide and preparing microtome slices with a thickness of 11 to 12 micron, which were treated with a toluene / isopropanol mixture and then exposed to a solution of boron. Next, place the adjusted cross-section slice on the microscope,
A 35mm photograph was taken to observe penetration and inclusion. PV
The OH containing areas were observed as dark colored areas.

Example 1 This example uses 33-50.5 dynes / c according to the method described above.
Figure 3 shows the foam numbers measured for various ethylene oxide-propylene oxide (EO-PO) surfactants with surface tensions in the m range.

Run 1 is a control using an aqueous wax PVOH size composition containing no surfactant. In addition, Experiments 2-16
Used an ethylene oxide-propylene oxide surfactant. The results are shown in Table I.

The results in Table I show that surface tension and foam number are important for controlling foaming. Experiments 2, 5-7, 9-
It can be seen that 13 and 16 control foaming very well. In experiments 3, 4, 8, 14 and 15 where the surfactant has a foam number greater than 20, very little control of foaming was observed at best.

Example 2 The size solution was WS from Air Products and Chemicals, Inc.
Prepared by slurrying 20.4 kg of -53 polyvinyl alcohol (degree of polymerization about 1700, degree of hydrolysis about 87-90 mol%) and 0.804 kg of ethylene oxide-propylene oxide surfactant in 183 kg of water. The solution was formed by spraying steam into the aqueous mixture with stirring until the temperature reached 98 ° C. The final solution solids were measured after the mixture was placed in the size box. Size composition,
Applied to a 50/50 polyester / cotton spun yarn having a yarn number of 24.5 as measured using a conventional commercial slash. The fluffiness of unsized yarn is 33.4hair /
It was in meters. The yarn speed during slashing was 12 yards / min and the temperature in the size box was 82 ° C (180 ° C).
It was at ° F).

The properties of the resulting sized yarns are shown in Table II. This result indicates that the surface tension of the EO-PO compound has a great influence on the fuzziness. A fluff% reduction of less than 55% is not acceptable as it is not sufficient to reduce shed or improve weaving efficiency. Experiments 20-26 showed an acceptable reduction in lint.

Example 3 Ethylene oxide-propylene oxide (EO-PO)
A size solution was prepared in the same manner as in Example 2 except that the content of the surfactant based on PVOH was changed to 2.0% by weight to 8.0% by weight. The EO-PO compound used was Pluronic 25R8 surfactant from BASF Wyandotte. The results in Table III show that the optimum ratio of EO-PO surfactant used to PVOH is 0.02.
It is shown to be between 5 and 0.07. When the amount of EO-PO block copolymer is larger, the strength of the size film is significantly reduced.

Example 4 The size solution is WS from Air Products and Chemicals, Inc.
Prepared by slurrying 26.5 kg of -53 polyvinyl alcohol (degree of polymerization about 900, degree of hydrolysis about 95-97 mol%) and 1.06 kg of ethylene oxide-propylene oxide surfactant in 177 kg of water. The solution was formed by spraying steam into the aqueous mixture with stirring until the temperature reached 98 ° C. The slashing conditions and yarns used were the same as in Example 2. The properties of the resulting sized yarns shown in Table IV show that the fluff is most reduced when the surface tension of the EO-PO adduct is maintained in the range 40-48 dynes / cm.

Example 5 This time, a size solution was prepared in the same manner as in Example 2 except that PVOH was changed to VINOL325 polyvinyl alcohol manufactured by Air Products and Chemicals, Inc. having a degree of polymerization of about 1700 and a degree of hydrolysis of 97.5 to 99 mol%. . The results shown in Table V show that the surface tension of the additive in the range studied has little effect on the reduction in fluff when using polyvinyl alcohol which is substantially fully hydrolyzed.

Example 6 A size solution was prepared in the same manner as in Example 4. However,
The PVOH used in this example is T-66 from DuPont and is considered a PVOH / methylmethacrylate copolymer. The additive used is Pluronic 25R8 surfactant.
The fuzz was generally the same as that obtained when WS-53 polyvinyl alcohol was used in Example 4.

Example 7 A size solution is prepared by adding 159 kg (350 lbs) of PVOH (DP900, degree of hydrolysis 87-89 mol%) and 6.4 kg (14 lbs) of ethylene oxide-propylene oxide adduct to 1325 k of water.
Prepared by slurrying in g. Temperature is 82 ℃
The solution was formed by spraying steam into the size solution with stirring until (180 ° F) was reached. The final solid content was 9%. This material was used to size 65/35 polyester / cotton spun yarn using conventional slashers. Yarn speed is 86 mud / min, size box temperature is 82 ° C (180 ° F), squeeze roll pressure is 15ps
ig Schlzer weaving slatted yarn
It was performed using an air-jet machine. The results obtained are shown in Table VI.
Shown in I.

The results in Table VII are the weaving efficiency and fluffiness of a conventional size treated warp (Experiment 38) using hydrogenated Tallow wax to provide lubricity, obtained using the wax-free formulation of the present invention. It is compared with that of (Experiments 39 and 40). Table VII shows that the weaving efficiency obtained by using the ethylene oxide-propylene oxide adduct is essentially the same as with the Tallow wax. Combining such weaving efficiency with low foamability, lubricity, and easy size removal treatments in the absence of wax is considered a major advance in the industry.

An ethylene oxide-propylene oxide surfactant having a surface tension of about 40-48 dynes / cm and a foaming number of less than about 20 prevents the accumulation on the dry can by depositing a liquid film on the drying drum. Prevents direct contact between PVOH coated fiber and can. In addition to the fact that the interfacial tension of surfactants is less than that of PVOH,
The phase separation between PVOH and surfactant leads to the attachment of the surfactant to the fiber surface, which provides lubricity. In addition, the surfactant also acts as a lubricant that promotes good penetration and complete encapsulation of the yarn, forming a stronger and less squeeze film due to its good adhesion and uniformity. is there. The size composition of the present invention has the advantage of having the excellent sizing properties inherent in partially hydrolyzed polyvinyl alcohols, which makes polyacrylates necessary in the case of fully hydrolyzed polyvinyl alcohols. It has become possible to omit the use of additives such as polyester, polyglycerol and the like.

The present invention is an aqueous, wax-free, polyvinyl alcohol-containing size composition that, when used with cotton-containing textile yarns, enables high weaving efficiency, acceptable fluffing, and extremely easy size removal treatments.

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Claims (16)

[Claims] 1. Essentially, (a) 100 parts by weight of at least 78 mol% hydrolyzed polyvinyl alcohol having a viscosity of about 3-60 cps in a 4% aqueous solution at 20 ° C. and (b) a 0.1% aqueous solution. 4 parts by weight of a surfactant are added to 100 parts by weight of polyvinyl alcohol having a surface tension of less than 49 dynes / cm measured at 25 ° C. and a degree of hydrolysis of about 87-89 mol% and a degree of polymerization of about 1700. A low-foaming size composition containing no wax and anionic surfactant, which comprises 2 to 6 parts by weight of an ethylene oxide-propylene oxide surfactant having a foaming number of less than about 20 in a 7% aqueous polyvinyl alcohol solution. 2. The size composition according to claim 1, wherein the polyvinyl alcohol is hydrolyzed at 85 to 97 mol%. 3. A foaming value of a surfactant having a surface tension of 40 to 48 dyne / cm and a surface tension of less than about 20 in a 7% polyvinyl alcohol aqueous solution containing 4 parts of the surfactant per 100 parts of polyvinyl alcohol. A size composition according to claim 1 having the formula: 4. The size composition according to claim 1, wherein the surfactant has a surface tension of 43 to 47 dynes / cm. 5. A size composition according to claim 3 wherein the surfactant has a foam number of less than 15. 6. A size composition according to claim 3 wherein the surfactant has a foaming number of less than 10. 7. The surfactant has the following formula: HO (C ₂ H ₄ O) _y (C ₃ H ₆ O) _x (C ₂ H ₄ O) _y H I and Where x and y are integers and are selected such that the oxypropylene groups account for at least 900 of the molecular weight of the surfactant and the oxyethylene groups account for 10-90% by weight of the surfactant. A size composition according to claim 1 which can also be represented by one of the formulas in which the units of ethylene oxide and propylene oxide in the above formula are reversed. 8. Essentially, (a) 100 parts of polyvinyl alcohol hydrolyzed at least 85 mol% and having a viscosity of about 3-60 cps at 20 ° C. and 4% aqueous solution, and (b) 25% 0.1% aqueous solution. 3 to 5 parts of an ethylene oxide-propylene oxide surfactant having a surface tension of 40 to 48 dyne / cm measured at 0 ° C., provided that the surfactant has the following formula: HO (C ₂ H ₄ O) _y (C ₃ H ₆ O) _x (C ₂ H ₄ O) _y H I and Wherein x and y are integers and are selected such that the oxypropylene groups account for at least 900 of the molecular weight of the surfactant and the oxyethylene groups account for 10-90% by weight of the surfactant. A size composition according to claim 1 consisting of one which can be represented by one of the formulas in which the units of ethylene oxide and propylene oxide of the above formula are reversed. 9. The size composition according to claim 8, wherein the surfactant has a foaming number of less than about 15 in a 7% polyvinyl alcohol aqueous solution containing 4 parts of the surfactant per 100 parts of the polyvinyl alcohol. object. 10. The size composition according to claim 8, wherein the polyvinyl alcohol is hydrolyzed at 85 to 97 mol%. 11. The size composition according to claim 8, wherein the polyvinyl alcohol is hydrolyzed at 87 to 89 mol%. 12. A polyvinyl alcohol 1 which is essentially (a) 87-89 mol% hydrolyzed and has a viscosity of about 3-60 cps at 20 ° C. in a 4% aqueous solution.
00 parts, and (b) in a 7% polyvinyl alcohol aqueous solution containing a surface tension in the range of 40 to 48 dynes / cm measured at 25 ° C. and a surfactant of 4 parts per 100 parts of polyvinyl alcohol. Ethylene Oxide-Propylene Oxide Surfactants With Foam Numbers Less Than about 20 3.5-
A size composition according to claim 1 consisting of 4.5 parts. 13. A size composition according to any one of claims 1, 8 or 12 in the form of an aqueous solution of 2 to 20% by weight of the size composition. 14. Essentially, (a) 100 parts by weight of at least 78 mol% hydrolyzed polyvinyl alcohol having a viscosity of about 3 to 60 cps in a 4% aqueous solution at 20 ° C., and (b) a 0.1% aqueous solution. 4 parts by weight of a surfactant are added to 100 parts by weight of polyvinyl alcohol having a surface tension of less than 49 dynes / cm measured at 25 ° C. and a degree of hydrolysis of about 87-89 mol% and a degree of polymerization of about 1700. 2 to 20 parts by weight of a size composition not containing a wax and an anionic surfactant, which comprises 2 to 6 parts by weight of an ethylene oxide-propylene oxide surfactant having a foaming number of less than about 20 in a 7% aqueous polyvinyl alcohol solution. Passing a cotton-containing spun yarn into an aqueous sizing composition containing an amount of 10%, removing excess sizing solution from the spun yarn, and drying the sized spun yarn. A weaving method comprising splitting spun yarn, winding it up as a beam of weaving yarn, weaving the spun yarn and removing the sizing from the textile product by washing with hot water. 15. A size composition consisting essentially of: (a) 100 parts of a polyvinyl alcohol that is at least 85 mol% hydrolyzed and has a viscosity of about 3-60 cps at 20 ° C. in a 4% aqueous solution; and (b) 0.1. % Aqueous solution measured at 25 ° C. 3-5 parts ethylene oxide-propylene oxide surfactant having a surface tension of 40-48 dynes / cm, provided that the surfactant has the formula: HO (C ₂ H ₄ O ) _Y (C ₃ H ₆ O) _x (C ₂ H ₄ O) _y H I and Wherein x and y are integers and are selected such that the oxypropylene groups account for at least 900 of the molecular weight of the surfactant and the oxyethylene groups account for 10-90% by weight of the surfactant. 15. A method of weaving according to claim 14 which is a size composition consisting of one of the formulas wherein the units of ethylene oxide and propylene oxide of the above formula can be reversed. 16. A polyvinyl alcohol 100 wherein the size composition is essentially (a) 87-89 mol% hydrolyzed and has a viscosity of about 3-60 cps in a 4% aqueous solution at 20 ° C.
Parts, and (b) a surface tension in the range of 40 to 48 dynes / cm measured at 25 ° C. with a 0.1% aqueous solution, and about 7% polyvinyl alcohol aqueous solution containing 4 parts of a surfactant per 100 parts of polyvinyl alcohol. Ethylene oxide-propylene oxide surfactant having a foaming number of less than 20 3.5 ~
15. The weaving method according to claim 14, which is a size composition consisting of 4.5 parts.