KR20050113182A - Water permeability imparting agent and fiber having the agent applied thereto - Google Patents

Abstract

A water permeability imparting agent comprising at least one specified quaternary ammonium salt and at least one specified phosphate salt in a specified ratio; and a water permeable fiber or fiber product comprising a fiber or fiber product having the agent applied thereto in an amount of 0.1 to 2.0 wt.%. Thus, the reduction of liquid return having relied on structural means, such as paper diaper and sanitary items, can be attained by the use of treating agent. Moreover, there are provided a water permeability imparting agent and a fiber or fiber product having the agent applied thereto, which realize enhancement of permanent water permeability, reduction of aging deterioration of permanent water permeability and capability with coping with speeding up of nonwoven fabric production process.

Description

Water-permeable imparting agent and the fiber to which the imparting agent is attached {WATER PERMEABILITY IMPARTING AGENT AND FIBER HAVING THE AGENT APPLIED THERETO}

This invention relates to the processing agent suitable for the fiber for nonwoven fabrics which can be used for fiber products, especially top sheets, such as a paper diaper and a synthetic napkin. More specifically, the urine, body fluid, and the like, which have been absorbed once through the top sheet, flow back from the top sheet and reduce liquid return property attached to the wearer, and the liquid of the top sheet ( The present invention relates to a water-permeable imparting agent for textiles having improved water absorption characteristics and durability water permeability.

In general, absorbent articles such as sanitary articles such as paper diapers and synthetic napkins have provided hydrophilicity to various nonwoven fabrics based on hydrophobic polyolefin fibers, triacetate fibers, or polyester fibers. It is a structure which arrange | positioned the material which consists of a cotton pulp, a polymer absorber, etc. between a top sheet and the back sheet which gave water repellency. Liquids such as urine and body fluids are absorbed by the absorber through the top sheet, but at this time, in order to eliminate the sticky feeling of the top sheet, the permeability should be good, that is, until the liquid is completely absorbed from the top sheet onto the absorber therein. It is necessary to have an extremely short time, and in addition, it is necessary to prevent the liquid once absorbed by the absorber from returning to the top sheet again, that is, reducing the liquid returnability. In addition, it is not preferable that the permeability of the top sheet flows out due to absorption of the liquid only once or twice and the water permeability decreases rapidly because the number of diaper changes is increased, so that the top sheet has permeability to withstand repeated liquid absorption. That is, it is required not only to be durable permeable but also to be durable in the long term, i.e., less aging deterioration of the durable permeability. In addition, in spunbond nonwoven fabric production, the uniform adhesion or permeability to the nonwoven fabric and the antistatic property at the time of winding the sheet are required in order to facilitate the smooth manufacturing in the nonwoven fabric manufacturing process. In the production of the nonwoven fabric, there is no antistatic property of the fibers and no entanglement in the cylinder, and a uniform web is formed, that is, good carding passability is required.

In order to comfortably wear a diaper, it is important that the initial permeability is good, the liquid returning property is low, and the durability of water permeability is also good, and a technique for improving these characteristics with a treatment agent has been proposed. Japanese Unexamined Patent Application Publication No. 63-14081 discloses a method of treating fibers with a linear alkylphosphate potassium salt having 12 to 22 carbon atoms. Japanese Patent Application Laid-Open No. 60-215870 discloses a treatment agent in which a C10-C30 alkyl phosphate ester salt is mixed with a C10-C30 betaine compound, a sulfate ester salt, or a sulfonate salt. Japanese Patent Laid-Open No. 4-82961 discloses a method of using polyether-modified silicone in combination with an alkyl phosphate ester salt. Japanese Patent Laid-Open No. 2000-170076 discloses a method of using two kinds of betaine compounds in combination with an alkyl phosphate ester salt. In addition, Japanese Patent Application Laid-Open No. 63-49158 discloses a method of using a mixture of sorbitan monooleate and polyoxyethylene sorbitan monooleate as these and other types of treatment agents. Japanese Patent Laid-Open No. 3-82871 discloses a method of using an alkoxylated ricinoleine or a hydride thereof. Japanese Patent Laid-Open No. 10-53955 discloses a method of using a polyether compound and polyether modified silicone in combination. In addition, Japanese Patent Application Laid-open No. Hei 9-56748 discloses a method for reducing liquid returnability by focusing research on the structure of textile products, so-called paper diapers and sanitary products. Japanese Patent Laid-Open No. 2001-123366 discloses a method for reducing liquid returnability by focusing research on the structure of a top sheet of a textile product.

However, the water permeability, especially the durability permeability obtained by the above-mentioned method proposed in the related art, is accompanied by the recent increase of the required level, and the lack of performance is present. In terms of production, with the recent increase in production speed, it has become impossible to sufficiently cope with the speeding up of the carding process of the nonwoven fabrication process.

Disclosure of the Invention

The object of the present invention is to improve the water permeability, in particular, the water permeability is significantly improved compared to the conventional method, improve the liquid return, and further impart water permeability that can cope with the high-speed carding, less durable deterioration of water permeability It is in offering the first.

Another object of the present invention is to provide a fiber imparted with water permeability with the water permeability imparting agent of the present invention.

Still other objects and advantages of the present invention will be apparent from the following description.

According to this invention, the said objective and advantage of this invention are (A) following formula (I):

(R ¹ , R ² , ^{R 3) N + -R 4 ·} X - ... (I)

Wherein, R ¹ is an aliphatic hydrocarbon group having a carbon number of 8~24, R ² is when R ¹ is an aliphatic hydrocarbon group having a carbon number of 8-18, an aliphatic hydrocarbon group having a carbon number of 8-18, R ¹ is the number of carbon atoms 19-24 When it is an aliphatic hydrocarbon group, it is a hydrogen atom, a C1-C3 aliphatic hydrocarbon group, or a C1-C3 hydroxyalkyl group, R <^3> and R <^4> is respectively independently a hydrogen atom, a C1-C3 aliphatic hydrocarbon group, or carbon number A hydroxyalkyl group of 1 to 3, X is an ionic moiety selected from the group consisting of halogen ions, nitrate ions, acetate ions, methyl sulfate ions, ethyl sulfate ions and dimethyl phosphate ions,

Quaternary ammonium salts represented by

(B) the following formula (II):

In formula, R <^5> is a C6-C20 aliphatic hydrocarbon group, R <^6> is an ethylene group and / or a propylene group, m is an integer of 0-15, Y is hydrogen ion, sodium ion, potassium ion, ammonium ion , An ionic moiety selected from the group consisting of diethanol ammonium ions and triethanol ammonium ions, n is an integer of 1 to 2,

Permeability provision characterized by containing 20 to 80 weight% and 80 to 20 weight%, respectively, based on the sum total of these quaternary ammonium salts (A) and phosphate salt (B) represented by Is achieved by the second.

According to the present invention, the above object and advantage of the present invention is to provide a water-permeable fiber, characterized in that the composition comprises 0.1 to 2.0% by weight of the water permeability imparting agent of the present invention imparted to the fiber and the fiber. have.

Preferred Embodiments of the Invention

The quaternary ammonium salt (component A) used by this invention is represented by said Formula (I).

In formula (I), R <^1> is a C8-C24 aliphatic hydrocarbon group, R <^2> is a C8-C18 aliphatic hydrocarbon group when R <^1> is a C8-C18 aliphatic hydrocarbon group, R <^1> is C19 When it is a -24 aliphatic hydrocarbon group, it is a hydrogen atom, a C1-C3 aliphatic hydrocarbon group, or a C1-C3 hydroxyalkyl group, R <^3> and R <^4> is respectively independently a hydrogen atom and a C1-C3 aliphatic group. It is a hydrocarbon group or a C1-C3 hydroxyalkyl group, X is an ionic residue chosen from the group which consists of a halogen ion, a nitrate ion, an acetate ion, a methyl sulfate ion, an ethyl sulfate ion, and a dimethyl phosphate ion.

The quaternary ammonium salt represented by Formula (I) can be used individually or in combination of 2 or more types.

In said formula (I), R <^1> and R <^2> are respectively independently, Preferably they are a C8-18 aliphatic hydrocarbon group. When the carbon number of R ¹ or R ² is 7 or less, the deterioration in durability of water permeability increases, carding passability deteriorates, hydrophilicity becomes too strong, durability of water permeability decreases, and liquid return property tends to increase. It is not preferable, and when either carbon number of R <^1>, R <^2> is 25 or more, since initial permeability becomes easy to fall, it is not preferable.

R ³ and R ⁴ are preferably an aliphatic hydrocarbon group having 1 to 3 carbon atoms. R ³ and R ⁴ Any of 4 or more carbon atoms is not preferable because the initial permeability and the durability permeability tend to decrease.

Preferred examples of component (A) include dioctyldimethylammonium chloride, didecyldimethylammonium chloride, dilauryldimethylammonium chloride, distearyldimethylammonium chloride, dialkyl alkyldimethylammonium chloride, and dicured fat. Alkyl dimethyl ammonium chloride, behenyl trimethyl ammonium chloride, dilauryl dimethyl ammonium methosulfate, dilauryl methyl ethyl ammonium ethosulfate, etc. are mentioned.

As a component similar to the specific quaternary ammonium salt (A) which can be used as the water permeability imparting agent of this invention, the quaternary ammonium phosphate salt mix | blended with the antistatic component of Unexamined-Japanese-Patent No. 61-289182 is 1 Further, Examples 1 to 6 of US Pat. No. 48,163,36 disclose soyadimethylethylammonium ethosulfate salts formulated in the processing agent for open end spinning (OES), but the former is bound to the N atom of quaternary ammonium. Since the hydrocarbon group has 8 to 18 carbon atoms, and the latter hydrocarbon group bonded to the N atom of ammonium has 16 to 18 carbon atoms, and all of them have only one such hydrocarbon group, the hydrophilicity is too strong and durable hydrophilicity is achieved. Cannot be granted.

The compounding ratio of (A) component is 20 to 80 weight% with respect to the sum total of (A) component and (B) component, Preferably it is 25 to 75 weight%. If it is less than 20 weight%, durability permeability will fall and durability deterioration of durability will become large. When it exceeds 80 weight%, carding passability falls and liquid return property increases, and it is unpreferable.

The phosphate salt (component B) used in the present invention is represented by the above formula (II). In formula (II), R ⁵ is an aliphatic hydrocarbon group having 6 to 20 carbon atoms, R ⁶ is an ethylene group, and / or propylene. M is an integer of 0 to 15, Y is an ionic moiety selected from the group consisting of hydrogen ions, sodium ions, potassium ions, ammonium ions, diethanolammonium ions and triethanolammonium ions, and n is 1 to 2 Is an integer.

The phosphate salt represented by formula (II) can be used alone or in combination of two or more.

In said formula (II), R <^5> , Preferably it is a C8-18 aliphatic hydrocarbon group. When the carbon number of R ⁵ is 5 or less, carding passability tends to deteriorate, hydrophilicity becomes too strong, durability permeability tends to decrease, liquid return property tends to increase, and carbon number of R ⁵ is 21 or more. In this case, the initial permeability decreases and the durability permeability also tends to decrease, which is not preferable.

m becomes like this. Preferably it is an integer of 0-10. When m is 16 or more, initial permeability falls and solidity of B component tends to become strong, and as a result, the handleability of a water permeability imparting agent becomes difficult, and it is unpreferable.

Preferred examples of the B component include hexyl phosphate sodium salt, octyl phosphate sodium salt, octyl phosphate potassium salt, decyl phosphate potassium salt, lauryl phosphate potassium salt, myristyl phosphate potassium salt, cetyl phosphate potassium salt, stearyl phosphate potassium salt, and beryl Henyl phosphate potassium salt, polyoxyethylene 4 mol addition decylphosphate sodium salt, polyoxyethylene 3 mol addition lauryl phosphate sodium salt, polyoxyethylene 2 mol addition cetylphosphate potassium salt, polyoxyethylene 15 mol addition cetyl phosphate potassium salt, Polyoxypropylene 2 mol polyoxyethylene 6 mol addition lauryl phosphate sodium salt, polyoxyethylene 3 mol addition lauryl phosphate diethanolamine salt, polyoxyethylene 3 mol addition lauryl phosphate triethanolamine salt, etc. are mentioned.

The compounding ratio of (B) component is 20 to 80 weight% with respect to the sum total of (A) component and (B) component, Preferably it is 25 to 75 weight%. If it is less than 20 weight%, carding passability falls and if it exceeds 80 weight%, a required amount of A component cannot be provided, and as a result, durability permeability falls and is unpreferable.

In addition to (A) component and (B) component, this invention uses the polyoxyalkylene modified silicone (component C) represented by following formula (III) about 5 with respect to the sum total of (A) component and (B) component. By using together with -20 weight%, durability permeability and carding permeability can be improved further.

In formula (III), R <^7> is a methylene group, ethylene group, a propylene group, N- (aminoethyl) methylimino group, or N- (aminopropyl) propylimino group, Z contains 20 weight% or more of polyoxyethylene parts. P and q are integers selected from the range whose Si content is 20 to 70 weight% and a molecular weight becomes 1,000 to 100,000.

As a polyoxyalkylene group which is Z, what copolymerized the structural monomers, such as a polyoxyethylene group, a polyoxypropylene group, a polyoxybutylene group, and this, is mentioned, for example. When the polyoxyethylene group is less than 20% by weight, sufficient initial permeability and durability permeability are hardly obtained, which is not preferable.

p and q are not preferable when the Si content is less than 20% by weight, since sufficient carding permeability and durability improvement effect are hardly obtained, while when the Si content is more than 70% by weight, the permeability imparting agent is poor and the cost is high. If the molecular weight is outside the range of 1,000 to 100,000, the effect of improving the initial permeability and the durability permeability is difficult to be obtained, which is not preferable.

By using (C) component together, this invention can remarkably improve durability and water permeability. As for the compounding ratio in a water permeability imparting agent, 5-20 weight% is preferable as mentioned above. If the blending ratio is less than 5% by weight, the effect of improving the water permeability and carding permeability is not sufficient, and if it exceeds 20% by weight, the water permeability is good, but the stability of the water permeability imparting agent tends to deteriorate and the cost is high. Not desirable

The water permeability imparting agent of this invention is given to the synthetic fiber, a natural fiber, or the product of the fiber. Preferably, for example, hydrophobic synthetic fibers such as polyolefins, polyesters, triacetates, nylons, vinyl chlorides or fibrous products composed of those hydrophobic fibers, fibrillated polyolefins, core-sheath polyesters- It can be applied to heat-sealing synthetic fibers and its fiber products composed of composite fibers of a combination such as polyethylene, polyester-polypropylene, polypropylene-polyethylene, low melting point polypropylene-polypropylene, low melting point polyester-polyester, and the like. . As the textile product, a nonwoven fabric product that can be used for nonwoven fabric products, particularly top sheets such as paper diapers and synthetic napkins, is suitable.

The water permeability imparting agent of this invention can be provided by a well-known method in arbitrary places of the manufacturing process of a nonwoven fabric, ie, spinning, extending | stretching and crimping process, and also spunbond, spunlace, and melt blown In nonwoven fabric manufacturing processes, such as these, it can provide by a normal method.

The water permeability imparting agent of this invention can be given to a fiber in emulsion or a straight line. In the case of emulsion, it is diluted to 5-30% by weight with water, and in the case of straight lubrication, it is diluted to 5-30% by weight with low-viscosity hydrocarbon compound, and it is well known such as roller touch, nozzle spray, immersion, etc. It can be given by the method.

The water permeability imparting agent of this invention is made to adhere 0.1 to 2.0 weight% normally, More preferably, 0.3 to 0.7 weight% with respect to a fiber. If the adhesion amount is less than 0.1% by weight, the initial permeability, durability permeability, antistatic property and lubricity are insufficient, and if the adhesion amount is more than 2.0% by weight, the amount of warpage increases during carding treatment of the fibers, which leads to a significant decrease in productivity. It is not preferable because such a textile product becomes sticky after a pitcher becomes large.

You may add another component to the water permeability imparting agent of this invention in the range which does not impair the objective of this invention other than the said component. Examples of the component that can be added include lubricants such as carnauba wax emulsions, nonionic activators, anionic activators other than phosphates, antifoaming agents, and preservatives.

By imparting the water permeability imparting agent of the present invention to the nonwoven fabric or the nonwoven fabric, it is possible to remarkably improve the initial permeability and durability of permeability of the urine and body fluids, and to obtain a nonwoven fabric having reduced durability of permeability and reduced liquid return. In the manufacturing process of the nonwoven fabric, since antistatic property and lubricity are improved, the carding performance is improved, and the carding passability can be further improved.

Although an Example demonstrates this invention below, this invention is not limited to this. Moreover, the evaluation item and evaluation method in each Example and a comparative example are as follows. Moreover, the specification and evaluation result of the processing agent in each Example and a comparative example are put together in Table 1 and Table 2, respectively. In the specification of the treating agent, the blending ratio represents any weight%.

The processing agent of the Example and the comparative example was applied to the warm-water degreasing surface so that it might become 0.5 weight% in pure content, and it dried. Subsequently, a web having a weight of 30 g / m ² per area was produced through the horn surface and each step of carding. The web was heat-treated at 130 ° C. in an air through hot air circulation dryer to fix the web. The nonwoven fabric thus produced was used for the following permeability test.

Carding characteristic: The carding passability determined the cylinder winding state as the main subject on the conditions of 30 degreeC x 70% RH, and the antistatic property was determined as the high voltage of the generated static electricity at 20 degreeC * 45% RH. . Each ranking is as follows.

Carding Passability: After carding 40g of short fibers of a sample under conditions of 30 degreeCx70% RH using a carding tester, a cylinder was observed and the following references | standards evaluated. 5... No entanglement, 4... 1/10 of the cylinder surface is wound, 3... 1/5 of the cylinder surface is wound, 2... Wound around 1/3 of cylinder surface, 1... Wrapped around the entire surface. 4 or more is allowed, but 5 is the best.

Antistatic property: Using the carding tester, 40 g of sample short fibers were made into the web on 20 degreeC x 45% RH conditions, the large voltage of the static electricity which generate | occur | produced on the web was measured, and the following references | standards evaluated. 5... Less than 100 V, 4... 0.1 to 1.0 kV, 3... 1.0 to 1.5 kV, 2... 1.5 to 2.0 kV, 1... Greater than 2.0 kV. Although 4 or more is made into the permissible range, 5 is the best.

Liquid return property of nonwoven fabric: A nonwoven fabric (10 cm × 10 cm) is placed on a commercial paper diaper, and a cylinder having an inner diameter of 70 mm is placed thereon, and 100 ml of saline is injected into a cylinder to pass a nonwoven fabric to a paper diaper. Absorb. When all of the saline solution is absorbed by the paper diaper, the cylinder is removed and 20 sheets of pre-weighed filter paper (No. 5 manufactured by Toyoro City) are stacked and a load of 5 kg is placed on it. After standing for 5 minutes, the filter paper was weighed, the weight increase was measured, and the amount of liquid returned (g). Although 1.5 g or less is made into the permissible range, 1.0 g or less is preferable.

The initial permeability of the nonwoven fabric: nonwoven fabric of the weight per unit area 30 g / m ² filter paper (Toyo tense as, No. 5) superposed on and artificial 1 drop (approximately 0.05 ml) from a burette to the installation height of 10 mm from the surface of the nonwoven fabric Urine is added dropwise and the time from the surface of the nonwoven fabric to the disappearance of water droplets is measured. This measurement is performed at 20 places on the surface of the nonwoven fabric, and the number less than 5 seconds is displayed. If the number is 18 or more, the initial permeability is good.

Durability permeability of nonwoven fabric: The nonwoven fabric (10 cm × 10 cm) is superimposed on a commercially available paper diaper, a cylinder with an internal diameter of 70 mm is placed thereon, and 50 ml of artificial urine is injected into the cylinder to be absorbed into the paper diaper. Let's do it. After leaving for 3 minutes after injection, the nonwoven fabric was sandwiched between 10 sheets of filter paper (Toyoro City, No. 5), and the plate (10 cm × 10 cm) and a weight of 3.7 kg were placed on it for 3 minutes. Dehydrate, then air dry for 5 minutes. About the part which passed the artificial urine of the sample nonwoven fabric after air drying, the loss time of artificial urine is measured in 20 places according to the test method of the initial permeability of a nonwoven fabric, and the number less than 5 second is displayed. If this number is 18 or more, water permeability is good. The same operation is repeated for the nonwoven fabric given to the test. In this repeated test, even if the number of times is repeated, the more the number of lost artificial urine is, the more durable the permeability is.

Water permeability after a change of day: The said nonwoven fabric (10 cm x 10 cm) is left to stand for 30 days at 40 degreeC x 70% RH environmental tester. After 30 days, the nonwoven fabric (10 cm x 10 cm) is taken out of the environmental tester and subjected to the initial permeability and durability permeability test of the nonwoven fabric. The smaller the difference between the initial permeability and the durability permeability before and after the introduction of the environmental tester, the smaller the change in durability permeability is. The smaller the change is better.

[Examples 1-8 and Comparative Examples 1-2]

TABLE 1

Comparative Examples 3 to 10

TABLE 2

Each component described in Table 1 and Table 2 is as follows.

A1: dilauryldimethylammonium chloride salt, A2: distearyldimethylammonium chloride salt, A3: behenyltrimethylammonium chloride salt, A4: lauryltrimethylammonium chloride salt, A5: trilaurylmethylammonium chloride salt, A6: soya Dimethylethylammonium Ethosulfate Salt.

Bl: polyoxyethylene (3 mol) lauryl ether phosphate diethanol ammonium salt, B2: polyoxyethylene (3 mol) decyletherphosphate diethanol ammonium salt, B3: polyoxyethylene (2 mol) cetyl ether phosphate potassium salt, B4: Butyl phosphate potassium salt, B5: behenylphosphate potassium salt, B6: polyoxyethylene (20 moles) lauryl ether phosphate diethanol ammonium salt.

C1: polyoxyethylene modified silicone of 65 weight% of silicon, molecular weight 10,000

Examples 1 to 8 corresponding to the composition and the ratio range shown in the present invention had good durability, low liquid return, and low permeability. On the other hand, Comparative Examples 1-9 which deviate from these component composition ranges could not satisfy all the required characteristics. The synergistic effect by the proper combination of each component is shown well. Compared with each Example, each comparative example is inferior to any one of initial permeability, durability permeability, liquid return property, water permeability after a change in day, carding permeability, or stability and handling property of a blended product.

As described above, when the water permeability imparting agent according to the present invention is imparted to a hydrophobic fiber or nonwoven fabric such as polypropylene fiber by means of spraying or the like, initial permeability and durability permeability are imparted to the fiber, and It is possible to reduce the deterioration of sex and to reduce the liquid return of the urine and body fluids.

Claims (9)

(A) the following formula (I): ^{(R 1, R 2, R} 3) N + -R 4 · X - ... (I) Wherein, R ¹ is an aliphatic hydrocarbon group having a carbon number of 8~24, R ² is when R ¹ is an aliphatic hydrocarbon group having a carbon number of 8-18, an aliphatic hydrocarbon group having a carbon number of 8-18, R ¹ is the number of carbon atoms 19-24 When it is an aliphatic hydrocarbon group, it is a hydrogen atom, a C1-C3 aliphatic hydrocarbon group, or a C1-C3 hydroxyalkyl group, R <^3> and R <^4> is respectively independently a hydrogen atom, a C1-C3 aliphatic hydrocarbon group, or carbon number A hydroxyalkyl group of 1 to 3, X is an ionic moiety selected from the group consisting of halogen ions, nitrate ions, acetate ions, methyl sulfate ions, ethyl sulfate ions and dimethyl phosphate ions, Quaternary ammonium salts represented by (B) the following formula (II): In formula, R <^5> is a C6-C20 aliphatic hydrocarbon group, R <^6> is an ethylene group and / or a propylene group, m is an integer of 0-15, Y is hydrogen ion, sodium ion, potassium ion, ammonium ion , An ionic moiety selected from the group consisting of diethanol ammonium ions and triethanol ammonium ions, n is an integer of 1 to 2, The pitcher for fibers containing 20 to 80% by weight and 80 to 20% by weight, respectively, based on the sum of these quaternary ammonium salts (A) and phosphate salts (B). Gender grant agent. The method of claim 1, In formula (I), R ¹ and R ² are each independently an aliphatic hydrocarbon group having 8 to 18 carbon atoms, and R ³ and R ⁴ are each independently an aliphatic hydrocarbon group having 1 to 3 carbon atoms. My. The method according to claim 1 or 2, In said formula (II), R <^5> is a C8-18 aliphatic hydrocarbon group and R <^6> is an ethylene group, The water permeability imparting agent. The method of claim 1, Formula (III) below: R ⁷ is a methylene group, an ethylene group, a propylene group, an N- (aminoethyl) methylimino group or an N- (aminopropyl) propylimino group, and Z is a polyoxyalkyl containing 20% by weight or more of a polyoxyethylene moiety. P and q are integers selected from the range of 20 to 70% by weight of Si content and 1,000 to 100,000 molecular weight, A water-permeable imparting agent for fibers containing 5 to 20% by weight of polyoxyalkylene-modified silicone represented by. The method of claim 1, Permeability imparting agent for fibers for nonwovens. The method of claim 1, A water permeability imparting agent for a hydrophobic synthetic fiber or a composite fiber thereof. The method of claim 6, The water-permeable imparting agent for fibers whose hydrophobic synthetic fiber is a polyolefin synthetic fiber. The water-permeable fiber which consists of 0.1 to 2.0 weight% of water permeability imparting agent for fibers of Claim 1 provided with respect to a fiber and the fiber. A water-permeable fiber comprising 0.1 to 2.0% by weight of a water-permeable imparting agent for fibers according to claim 4 imparted to the fiber and the fiber.