JPH02216265A - Cloth-like material having water permeability comprising polyolefine-based yarn - Google Patents

Abstract

PURPOSE:To obtain a cloth-like material showing excellent water permeability of durability by coating a cloth-like material comprising polyolefin-based yarn with a polyglycerin fatty acid ester and treating the yarn with a polyoxyalkylene modified silicone. CONSTITUTION:A cloth-like material comprising polyolefin-based yarn, especially a cloth-like material comprising sheath-core type conjugate yarn having a core part made of synthetic yarn capable of subjected to melt spinning except the polyolefin-based yarn is treated with a treating solution containing 50-95bwt.% polyglycerin fatty acid ester shown by formula I (n is 2-4; R<1> is 5-21C alkyl or alkenyl; R<2> and R<3> are H, 6-22C alkanoyl or alkenoyl) and 45-95wt.% polyoxyalkylene modified silicone shown by formula II (X is 1-10; Y is 7-100; a is >=5, b<=95 and a+b is <=100; R<4> is H or 1-12C alkyl; R<5> is CH3, etc.) to give a cloth-like material suitable as paper diaper, etc., having excellent water permeability of good durability.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a water-permeable fabric made of polyolefin fibers, and more specifically, it is suitable as a facing part (a part that comes into direct contact with the skin) of sanitary products. The present invention relates to a cloth-like material having durable water permeability.

In recent years, dry-processed nonwoven fabrics, especially #a plating adhesive type nonwoven fabrics in the medical and sanitary material fields, have been attracting attention. Among them, disposable diapers,
Polyolefin fibers, especially polyethylene composite fibers, are often used for nonwoven fabrics for facing parts of napkins, etc., because of their low production costs and good texture (softness, avoidance of discomfort due to wetness) as a product. In particular, in order to improve the bulkiness of the product, prevent a feeling of stiffness, and improve thermal dimensional stability, composite materials are used, in which the sheath is made of low-melting polyolefin fibers such as polyethylene fibers and the core is made of polyester fibers or polypropylene lam. Spun fibers are often used.

By the way, in order to avoid discomfort due to sweat, urine, body fluids, etc. when wearing disposable diapers, napkins, etc., it is important that the facing part of these products gets wet easily, and that this wettability is exerted in a short period of time. It is considered. Therefore, the polyolefin fibers constituting the facing portion are required to have water permeability within a short period of time. At the same time, because disposable diapers are worn by infants, adults, sick people, etc. who are unable to dispose of their own excrement, one wear does not necessarily dispose of one excrement, but several times. It is necessary to avoid discomfort due to drainage of water, and therefore, the durability of the water permeability (repetitive water permeability) is also strongly required.

The present invention relates to an improved cloth made of polyolefin fibers which inherently have extremely poor water permeability due to their low surface energy properties, and which meets the above requirements.

<Conventional technology and its problems> Conventionally, in order to impart water permeability to polyolefin fibers and sheath polyolefin composite spun fibers, the following methods were used: 1) Attachment of a low-molecular wood-philic compound, 2) Attachment of a wood-philic polymer resin, 3) ) The surface has been modified by chemical treatment, solvent treatment, plasma treatment, corona discharge treatment, etc.

However, with the above method (l), not only does the adhesive not wet the surface of the 1m fiber so well that the expected water permeability cannot be obtained, but even if a certain degree of water permeability is obtained, no durability is obtained. Moreover, there is a problem in that many of them are highly irritating to the skin. In addition, the above means 2) generally have insufficient durability, and if an adhesive that can provide a certain degree of durability is used, the water permeability will be insufficient, and the adhesive will cause various problems during the nonwoven fabric manufacturing process. The problem is that it causes problems. Although the above method 3) has the advantage of obtaining relatively good results in terms of skin irritation and water permeability, #I
The problem is that water permeability tends to decrease over time due to changes in the polar groups generated over time, resulting in insufficient durability, and furthermore, such means are uneconomical in themselves. There is.

<Problems to be Solved by the Invention, Means for Solving the Problems> The present invention provides an improved cloth-like material that solves the conventional problems as described above and meets the above-mentioned demands.

However, as a result of intensive research from the above viewpoint, the present inventors found that
The present inventors have discovered that a cloth-like material made of polyolefin fibers, on which a predetermined amount of a specific polyglycerol fatty acid ester remains attached, is suitable and has completed the present invention.

That is, the present invention.

A cloth-like material made of polyolefin fibers, which has water permeability based on the fact that 0.05 to 1% by weight of polyglycerin fatty acid ester represented by the following general formula A remains attached to the cloth-like material. It pertains to cloth-like objects.

General formula A: H5 [J-(UH2L; l(C;87 (Isy R
J [where n is an integer of 2 to 14, R1 is a carbon number of 5 to 21
an alkyl group or an alkenyl group, R2 and R3 are H, and a furucyl group or an alkenoyl group having 6 to 2z carbon atoms.] In the present invention, the polyolefin fiber is a fiber obtained from a homopolymer of ethylene or propylene, or a fiber obtained from a homopolymer of ethylene or propylene, or a fiber obtained from a homopolymer of ethylene or propylene, or Fibers obtained from copolymers with vinyl monomers that can be copolymerized with these fibers are preferably composite spun fibers with a core-sheath structure, in which the sheath portion is made of polyethylene fibers and the core portion is made of polyethylene fibers. This is a composite spun mra made of a melt-spun thermoplastic synthetic fiber 1 other than a#I, such as polyester fiber or polypropylene fiber.

In addition, in the present invention, the cloth-like material includes, in addition to textiles obtained by weaving and knitting the polyolefin-based ms, dry nonwoven fabrics, adhesive nonwoven fabrics, etc., and preferably nonwoven fabrics. be.

The polyglycerin fatty acid ester represented by the general formula A is an ester of a fatty acid and a polyglycerin obtained by heat dehydration of glycerin in the presence of a catalyst or a ring-opening addition reaction between glycerin and glycidol. The polyglycerin fatty acid ester includes those in which all the hydroxyl groups in the polyglycerin are completely esterified, but partial esters in which 10 to 60% of the total hydroxyl groups are esterified are preferable.

The fatty acid moiety of the polyglycerol fatty acid ester has 6 to 22 carbon atoms, preferably 12 to 18 carbon atoms.

The degree of condensation n of glycerin forming the polyglycerin moiety is 2 to 14, preferably 4 to 10. Usually, polyglycerin obtained by dehydrating and condensing glycerin under an alkali catalyst contains a by-product. Although cyclic polyglycerin exists, in the present invention, there is no problem even if the polyglycerin fatty acid ester obtained from polyglycerin partially containing the cyclic polyglycerin.

Specific examples of the polyglycerin fatty acid ester used in the present invention include diglycerin monolaurate, diglycerin monooleate, tetraglycerin monolaurate, tetraglycerin heptanostearate, tetraglycerin distearate, hexaglycerin monolaurate,
Examples include hexaglycerol monomyristate, hexaglycerol heptanostearate, hexaglycerol distearate, hexaglycerol dioleate, decaglycerol tristearate, and the like.

As mentioned above, the cloth-like article according to the present invention is a cloth-like article made of polyolefin fibers, and the polyglycerin fatty acid ester remains attached to the cloth-like article in an amount of 0.05 to 1% by weight. However, preferably 0.1 to 0.7% by weight remains attached. Remaining amount of adhesion is 0.0
If it is less than 5% by weight, the desired water permeability and durability cannot be obtained, and if the amount of residual adhesion exceeds 1% by weight, it will be difficult to obtain a commensurate effect for the amount used, making it uneconomical. It is true.

The above-mentioned residual adhesion can be avoided by treating the polyolefin fibers that will constitute the cloth-like article or the cloth-like article directly with a processing agent containing the polyglycerol fatty acid ester during the production or processing stage of the polyolefin fibers that will constitute the cloth-like article. done by doing.

The processing agent used preferably contains 50% by weight or more of the polyglycerin fatty acid ester, in this case,
Contains other ingredients in a range of less than 50% by weight,
Preferred other components include polyoxyalkylene-modified silicones represented by the following general formula B.

General formula B: [where X is an integer of 1 to 10, y is an integer of 7 to 100,
a is an integer of 5 or more, b is an integer of 95 or less, and a+b is an integer of 100 or less, Ha is H or an alkyl group having 1 to 12 carbon atoms, R5 is GH3 or 03 H60-(-Cz H
J 0 catty (CzH60GarR4,) The polyoxyalkylene-modified silicone represented by the general formula B is dimethylhydrodiene polysiloxane, polyethylene glycol, block or random copolymer polyether of polyethylene glycol and polypropylene glycol, carbon number 1
Ethylene oxide adduct to ~12 alcohol, propylene oxide to C1-12 alcohol/
It is a modified silicone obtained by adding a monoallyl ether such as a block or random adduct of ethylene oxide.

The above-mentioned polyoxyalkylene-modified silicone is characterized by low water solubility based on its structure. In fact, in order to give the resulting modified silicone a minimum level of water solubility and to obtain satisfactory water permeability, X in general formula B must be 1 or more, but conversely, if X is greater than 10, The water solubility of the obtained modified silicone becomes too high, and although the water permeability is satisfactory, the durability becomes insufficient. Similarly, in order to give the obtained modified silicone a minimum water solubility and to obtain satisfactory water permeability, a of Hani B needs to be 5 or more, but conversely, a+b is less than 100. If it is too large, the durability of the resulting modified silicone will be greatly impaired.

In this case, the molar ratio or ffi ratio of the polyoxyethylene part bound by a and the polyoxypropylene part bound by b also has an influence, and preferably a X 44
/ b If y in general formula B is smaller than 7, the durability of the modified silicone obtained will be poor;
If it is larger than 0, water permeability will deteriorate.

A preferable treatment agent used in the present invention contains 50% by weight or more of polyglycerin fatty acid ester as described above and 5 to 45% by weight, more preferably 20 to 45% by weight of polyoxyalkylene-modified silicone. However, in this case, various surfactants as Wf antistatic agents, emulsifiers, and smoothing agents may be contained within a range that does not impair the effects of the present invention.

The present invention does not particularly limit the method or process of attaching the polyglycerol fatty acid ester to the cloth-like material. Examples of the attaching method include using a 0.1-10% by weight emulsion of the treatment agent as described above. A dipping method, a spray method, a roller oiling method, etc. can be employed.5 At this time, the concentration and squeezing rate of the emulsified liquid can be adjusted so that the amount of the polyglycerin fatty acid ester remaining attached to the cloth-like material is within a predetermined range. All you have to do is adjust it as appropriate. Examples of the adhesion process include a spinning process for polyolefin fibers, an oil treatment process for raw cotton prior to the spinning process, a nonwoven fabric manufacturing process, a knitting process, and an oil treatment process for threads prior to the weaving process. It is also possible to directly process items that have become knitted fabrics.

Examples will be given below to make the structure and effects of the present invention more concrete, but the present invention is not limited to these Examples.

<Examples, etc.> Nonwoven fabric samples (1) were prepared using the treatment agents listed in Table 1 below, and measurements and evaluations (2) to (4) were further performed. The results are shown in Tables 2 to 5 below. In addition, % used below
are all weight %.

(1) The adjustment sheath part of the nonwoven fabric sample is polyethylene, and the core part is polyester. Composite m of 2 denier x 51 intestine l cut length! a.

After being immersed once in the solution listed in Table 2 or Table 4 for each treatment agent at 30°C for 2 minutes, it was squeezed at the squeezing rate listed in the same table and air-dried at 60°C for 60 minutes. This is 25℃×
The humidity was controlled for 24 hours at a temperature and humidity of 40% RH, and the web weight was reduced to 24 g/m using a fiber opening machine and roller card at the same temperature and humidity.
2, and created a card web.

This card web was cut into 1 Ocm
A nonwoven fabric sample was obtained.

(2) Measurement of residual adhesion value of polyglycerin fatty acid ester The nonwoven fabric sample (W+g) of (1) was subjected to Soxhlet extraction using methanol, and all treatment agents remained adhered. (12
Next, the extracted fraction was subjected to gradient elution analysis using column chromatography using silica gel as an adsorbent, and the ratio of polyglycerin fatty acid ester (P
%) was calculated. Then, the remaining amount of polyglycerin fatty acid ester adhered (0%) was determined using the following formula.

c = 112 A drop of water of 0.41 is dropped from a height of logm using
The time required for the water droplets to be completely absorbed was measured.

(4) Evaluation of Durability After sprinkling 801 ion-exchanged water over the entire surface of the nonwoven fabric sample in (1) and allowing it to pass through, it was air-dried at 40° C. for 90 minutes, and the water permeability was evaluated again. Durability evaluation: 1. If the measured water permeability value is within 60 seconds, read the measured value, pass 801 ion exchange water again, and then repeat the above water permeability evaluation. The total number of repetitions does not exceed 60 seconds.

Table 1 (Treatment agent) Table 1 (Table S on previous page) Table 1 (Table S on previous page) note) The concentration is the concentration of the processing agent solution.

The total remaining amount of adhesion is the total amount of remaining adhesion of the treatment agent.

The remaining amount of adhesion is the amount of remaining adhesion of polyglycerin fatty acid ester.

These are the same below.

Table 2 Table 3 Table 4 <Effects of the Invention> As explained above, the present invention can exhibit excellent water permeability and durability, which are particularly desired in the facing part of sanitary napkins. There is an effect.

Patent applicant: Takemoto Yushi Co., Ltd. Agent: Hiroshi Yama, Patent Attorney Table 5

Claims (4)

[Claims] 1. A cloth-like article made of polyolefin fibers, characterized in that 0.05 to 1% by weight of a polyglycerin fatty acid ester represented by the following general formula A remains attached to the cloth-like article, and has water permeability. cloth-like material with General formula A: ▲There are mathematical formulas, chemical formulas, tables, etc.▼ [However, n is an integer from 2 to 14. R^1 has 5 to 21 carbon atoms
an alkyl or alkenyl group. R^2, R^3 are H,
An alkanoyl group or an alkenoyl group having 6 to 22 carbon atoms. ] 2. 50 to 95% by weight of polyglycerol fatty acid ester represented by general formula A for polyolefin fibers or cloth-like materials
By treating with a treatment agent containing 45 to 5% by weight of polyoxyalkylene-modified silicone represented by the following general formula B, the polyglycerol fatty acid ester represented by the general formula A is added to the fabric by 0.05 to 1% by weight. 2. The water-permeable cloth material according to claim 1, wherein % by weight remains attached. General formula B: ▲There are mathematical formulas, chemical formulas, tables, etc.▼ [However, x is an integer from 1 to 10. y is an integer from 7 to 100. a is an integer of 5 or more, b is an integer of 95 or less, and a+b is an integer of 100 or less. R^4 is H or an alkyl group having 1 to 12 carbon atoms. R^5 is CH_3 or ▲There are mathematical formulas, chemical formulas, tables, etc.▼ 3. 3. The polyolefin fiber is a composite spun fiber having a core-sheath structure, wherein the sheath portion is a polyethylene fiber and the core portion is a composite spun fiber consisting of a melt-spun thermoplastic synthetic fiber other than the polyethylene fiber. A cloth-like material with water permeability. 4. The water-permeable cloth-like article according to claim 1, 2 or 3, wherein the cloth-like article is a non-woven fabric.