JP2020168783A - Elastic laminate - Google Patents

Abstract

To provide an elastic laminate having sufficient tensile strength even when having a thin thickness, having less ooze of a chemical, etc., capable of preventing delamination from occurring and suitable for medical use.SOLUTION: The elastic laminate having a nonwoven fabric and an elastic base material bonded by embossing has a thickness of 0.02-3.0 mm and satisfies the following formula: 0.3≤1000×a ventilation resistance (kPa s/m)/{an embossing rate(%)×a formation index}≤2.3.SELECTED DRAWING: None

Description

The present invention relates to a stretchable laminate.

In the medical field, fabrics (stretchable materials) having excellent extensibility are required for a wide range of products such as gauze, bandages and poultices. Since these product groups are worn by humans, they should not be uncomfortable, and specifically, they are required to have a certain degree of thinness, flexibility, and breathability.

In general, woven fabrics and short fiber non-woven fabrics are used as elastic materials for medical use, but in recent years, many examples of using ultrafine long fibers have been reported.
For example, Patent Document 1 below discloses a support for a pap made of a melt-blown non-woven fabric which is a long-fiber non-woven fabric as a single layer. Specifically, a melt-blown non-woven fabric made of PVA as a raw material is used for a pap. It is disclosed that the support has chemical retention, long-lasting chemical effect, and stickiness.

Further, Patent Document 2 below discloses a stretchable composite fiber sheet in which a non-woven fabric made of an elastomer fiber and a non-woven fabric or a woven fabric of a non-elastomer fiber are composited. The non-woven fabric of such non-elastomer fibers is mainly formed by a needle punching method, and the two non-woven fabrics are composited by thermal adhesion.

JP 2001-79032 Japanese Unexamined Patent Publication No. 63-145436

In view of the above prior art, the problem to be solved by the present invention is that it has sufficient tensile strength even if it is thin, has little exudation of chemicals, etc., and does not cause delamination, and is suitable for medical use. It is to provide a stretchable laminate.

As a result of diligent research and experiments to solve the above-mentioned problems, the present inventors unexpectedly found that the stretchable laminate having a specific structure described below can solve the above-mentioned problems, and completed the present invention. It is an invention.

That is, the present invention is as follows.
[1] A stretchable laminate in which a non-woven fabric and a stretchable base material are joined by embossing, the thickness of the stretchable laminate is 0.02 mm to 3.0 mm, and the stretchable laminate is formed. The body is the following formula:
0.3 ≤ 1000 x ventilation resistance (kPa · s / m) / {embossing rate (%) x formation index} ≤ 2.3
An elastic laminate characterized by satisfying.
[2] The stretchable laminate according to the above [1], wherein the embossing rate is 5% to 65%.
[3] The stretchable laminate according to the above [1] or [2], wherein the ventilation resistance of the stretchable laminate is 0.1 kPa · s / m to 4.0 kPa · s / m.
[4] The stretchable laminate according to any one of [1] to [3], wherein the stretchable laminate has a formation index of 20 to 200.
[5] The stretchable laminate according to any one of the above [1] to [4], wherein the tensile strength of the stretchable laminate at 5% elongation is 0.01 N / 25 mm to 5.0 N / 25 mm.
[6] The stretchable laminate according to any one of [1] to [5], wherein the stretch recovery rate of the stretchable laminate is 60% to 100%.
[7] The stretchable laminate according to any one of [1] to [6], wherein the non-woven fabric has an average fiber diameter of 0.1 μm to 3 μm.
[8] The specific surface area of the nonwoven fabric is 0.1m ² /g~4.5m ² / g, stretch laminate according to any one of [1] to [7].
[9] the basis weight of the nonwoven fabric is ^{1.0g / m 2 ~40g / m 2} , elastic laminate according to any one of [1] to [8].
[10] The stretchable laminate according to any one of [1] to [9], wherein the non-woven fabric has a porosity of 40% to 95%.
[11] The stretchable laminate according to any one of the above [1] to [10], which is for medical use.

The stretchable laminate according to the present invention has sufficient tensile strength even if it is thin, has little chemical exudation, and does not cause delamination, so that it can be suitably used as a medical stretchable material. is there.

Hereinafter, embodiments of the present invention will be described in detail.
The elastic laminate of the present embodiment is an elastic laminate in which a non-woven fabric and an elastic base material are joined by embossing, and the thickness of the elastic laminate is 0.02 mm to 3.0 mm. And the elastic laminate is as follows:
0.3 ≤ 1000 x ventilation resistance (kPa · s / m) / {embossing rate (%) x formation index} ≤ 2.3
It is characterized by satisfying.

The stretchable laminate of the present embodiment is a laminate containing a non-woven fabric and a stretchable base material.
The type of the non-woven fabric constituting the elastic laminate of the present embodiment is not particularly limited, and the non-woven fabric may be a non-woven fabric by a dry method, a wet method, an electrospinning method, a melt blown method or the like using ultrafine fibers. Preferably, it is a non-woven fabric produced by the melt blown method because an ultrafine non-woven fabric can be easily and densely formed.

As the stretchable base material constituting the stretchable laminate of the present embodiment, as long as the stretchability of either the vertical or horizontal fabric is 5% or more under a load of 4.0 N / 25 mm, the type of the fabric is particularly limited. However, woven fabrics, knitted fabrics, non-woven fabrics and the like can be used, but knitted fabrics are preferable.

In the stretchable laminate of the present embodiment, the non-woven fabric and the stretchable base material are joined by embossing. Joining by embossing is preferable because it can maintain the surface area, pore size, and stretch characteristics of the stretchable base material of the non-woven fabric, and can integrate a plurality of webs having different properties without using a binder, and is particularly preferable for a medical stretchable laminate. Very preferred as. The surface pattern of the roll having an uneven surface used in the embossing is preferably one that does not destroy the characteristics of the non-woven fabric and the stretchable base material. Further, the embossing is preferably performed at a temperature 100 to 200 ° C. lower than the melting point of the thermoplastic resin constituting the non-woven fabric and / or the stretchable base material.

The thickness of the stretchable laminate of the present embodiment is 0.02 mm to 3.0 mm, more preferably 0.05 mm to 2 mm, and further preferably 0.1 mm to 1.5 mm. If the thickness is less than 0.02 mm, the handleability will deteriorate. On the other hand, if the thickness exceeds 3.0 mm, the discomfort during use becomes large.

The elastic laminate of this embodiment has the following formula:
0.3 ≤ 1000 x ventilation resistance (kPa · s / m) / {embossing rate (%) x formation index} ≤ 2.3
It is characterized by satisfying. If 1000 x ventilation resistance (kPa · s / m) / {embossing rate (%) x formation index} is less than 0.3, the drug seeps out to the stretchable substrate, while 2. If it exceeds 3, peeling (delamination) between the non-woven fabric and the elastic base material occurs. It is more preferable that 1000 × ventilation resistance (kPa · s / m) / {embossing rate (%) × formation index} is 0.6 or more and 2.0 or less.

The embossing rate of the elastic laminate of the present embodiment in the embossing process is preferably 5% to 65%. When the embossing rate is 5% or more, the non-woven fabric and the elastic base material can be sufficiently integrated, and delamination is unlikely to occur. On the other hand, if the embossing rate is 65% or less, the characteristics of the non-woven fabric and the stretchable base material are not destroyed.

The average fiber diameter of the fibers constituting the non-woven fabric constituting the elastic laminate of the present embodiment is preferably 0.1 μm to 3 μm, more preferably 0.2 μm to 2.5 μm, and further preferably 0.3 μm. It is ~ 2 μm. When the average fiber diameter is 0.1 μm or more, the chemical is sufficiently permeated into the non-woven fabric, while when the average fiber diameter is 3 μm or less, the chemical is less likely to seep into the stretchable substrate.

In the elastic laminate of the present embodiment, dispersibility is an important factor for drug retention, and the formation index for indexing dispersibility is preferably 20 to 200, more preferably 30 to 180, and even more preferably 30 to 180. It is 35 to 170. When the formation index is 200 or less, the uneven basis weight is sufficiently small, and the chemicals are less likely to seep into the stretchable base material in places where the basis weight is small. On the other hand, if the formation index is 20 or more, the chemicals sufficiently penetrate into the non-woven fabric.

The tensile strength of the stretchable laminate of the present embodiment at 5% elongation is preferably 0.01 N / 25 mm to 5.0 N / 25 mm, more preferably 0.02 N / 25 mm to 4.0 N / 25 mm. More preferably, it is 0.03N / 25mm to 3.5N / 25mm. If the tensile strength at 5% elongation is 5.0 N / 25 mm or less, the fit is good and the tightening is appropriate.

The elongation recovery rate of the stretchable laminate of the present embodiment is preferably 60% to 100%, more preferably 65% to 100%, still more preferably 70 to 100%, and particularly preferably 80 to 100%. is there. If the elongation recovery rate is 60% or more, the structure is not destroyed, while if it is 100% or less, the fit is good and the tightening is appropriate.

The stretchable laminate air resistance of the present embodiment is preferably 0.1 kPa · s / m to 4.0 kPa · s / m, more preferably 0.2 kPa · s / m to 3.5 kPa · s / m. m, more preferably 0.3 to 3.0 kPa · s / m. When the aeration resistance is 0.1 kPa · s / m or more, the chemicals are less likely to seep into the stretchable base material. On the other hand, if the ventilation resistance is 4.0 kPa · s / m or less, the chemicals sufficiently penetrate into the non-woven fabric.

The specific surface area of the nonwoven fabric constituting the stretch laminate of the present embodiment ^is preferably 0.1m ² /g~4.5m 2 / g, more preferably 0.3m ² /g~3.5m ² / g, further preferably from 0.5m ² /g~3.0m ² / g. When the specific surface area is 0.1 m ² / g or more, the drug is less likely to seep into the stretchable base material. On the other hand, if it is 4.5 m ² / g or less, the chemicals sufficiently penetrate into the non-woven fabric.

Basis weight of the nonwoven fabric constituting the stretch laminate of the present embodiment ^is preferably ^{1.0g / m 2 ~40g / m 2} , more preferably ^{2g / m 2 ~30g / m 2} , more preferably 3g / M ^{2 to} 25 g / m ² . When the basis weight is 1.0 g / m ² or more, the chemicals are less likely to seep into the elastic base material. On the other hand, if the basis weight is 40 g / m ² or less, the chemicals sufficiently penetrate into the non-woven fabric.

The porosity of the non-woven fabric constituting the stretchable laminate of the present embodiment is preferably 40% to 95%, more preferably 50% to 93%, still more preferably 55% to 90%. If the porosity is 40% or more, a high surface area can be maintained, while if it is 95% or less, the shape can be maintained as a non-woven fabric.

The stretchable laminate of the present embodiment is preferably made of a thermoplastic synthetic resin for both the non-woven fabric and the stretchable base material. For example, it can be a polyolefin-based resin, a polyester-based resin, a polyphenylene sulfide-based resin, and specifically, ethylene, propylene, 1-butene, 1-hexane, 4-methyl-1-pentene, 1-octene, etc. High-pressure low-density polyethylene, linear low-density polyethylene (LLDPE), high-density polyethylene, polypropylene (propylene homopolymer), polypropylene random copolymer, poly1-butene, poly, which are single or copolymers of α-olefin. 4-Methyl-1-pentene, polyolefin of ethylene / propylene random copolymer, polyester (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate) can be used. In particular, by using a non-woven fabric composed of a resin having a melting point of 140 ° C. or higher, the processing characteristics when integrated with the spinning stability are good. The material of the non-woven fabric and the elastic base material is more preferably a polyester-based or polypropylene polymer.

Hereinafter, the present embodiment will be specifically described with reference to examples, but the present embodiment is not limited to these examples. In the following Examples and Comparative Examples, unless otherwise specified, the physical properties of the non-woven fabric and the stretchable base material were measured using those peeled off from the stretchable laminate.

(1) Thickness (μm)
The measurement is carried out with a load of 5 g / cm ² using a PEACOCK thickness gauge. Measure a total of 10 points evenly in the vertical and horizontal directions, and use the average value as the thickness.

(2) Ventilation resistance [kPa · s / m]
The ventilation resistance of the sample was measured.
Measuring device: KES-F8-AP1 made by Katou Tech Co., Ltd. Measurement condition: Piston speed: 2.0 cm / s
Integral method: Standard
Sensitivity: L (200 Pa / V)
Vent area: 2π (cm ² )

(3) Formation index Device model: FMT-MIII Nomura Shoji Co., Ltd. was used.
With no sample set, the amount of transmitted light when the light source was on and off was measured with a CCD camera. Subsequently, the amount of transmitted light was measured in the same manner with the sample cut to A4 size set, and the average transmittance, the average absorbance, and the standard deviation (variation in absorbance) were determined. The formation index can be calculated by {standard deviation ÷ average absorbance} × 10. The formation index has an extremely high correlation with visual inspection, and is the most straightforward index of the formation of the sample. In addition, the better the formation, the smaller the formation index, and the worse the formation, the larger the value.

(4) Measurement of average fiber diameter (μm) The average fiber diameter of the non-woven fabric was measured as a laminated body. The laminate was cut into 10 cm × 10 cm, pressed on an iron plate at 60 ° C. above and below at a pressure of 0.30 MPa for 90 seconds, and then platinum was deposited on the non-woven fabric surface. Using an SEM device (manufactured by JSM-6510, JEOL Ltd.), the non-woven fabric surface was photographed under the conditions of an acceleration voltage of 15 kV and a working distance of 21 mm. The imaging magnification was 10000 times for threads having an average fiber diameter of less than 0.5 μm, 6000 times for threads having an average fiber diameter of 0.5 or more and less than 1.5 μm, and 4000 times for threads having an average fiber diameter of 1.5 μm or more. The field of view at each shooting magnification was 12.7 μm × 9.3 μm at 10000 times, 21.1 μm × 15.9 μm at 6000 times, and 31.7 μm × 23.9 μm at 4000 times. More than 100 fibers were randomly photographed, and all fiber diameters were photographed. However, the fibers fused in the yarn length direction were excluded from the length measurement targets. The following formula:
Dw = ΣWi ・ Di = Σ (NiDi ² ) / (Ni ・ Di)
{In the formula, Wi = weight fraction of fiber diameter Di = Ni · Di / ΣNi · Di. Here, i is the number of fibers photographed, Di is the fiber diameter of the i-th fiber, and Ni is the number of fibers having the fiber diameter Di. }
The weight average fiber diameter (Dw) obtained from the above was taken as the average fiber diameter.

(5) Measurement of tensile strength (N / 25 mm) at 5% elongation According to the method specified in JIS 8113, a test piece having a width of 25 mm and a length of 200 mm is fixed so that the distance between the gripping tools is 100 mm, and a cloth is used. The head speed is measured at 20 mm / min. A load is applied until the test piece breaks, and a total of 5 points are measured in each of the vertical and horizontal directions, and the tension at 5% elongation is confirmed from the result.

(6) Growth recovery rate (%)
A sample having a width of 25 mm and a length of 200 mm is fixed so that the distance between the grippers is 100 mm, and the crosshead speed is increased to 20 mm / min and the distance between the grippers is extended to 200 mm. From the result of releasing the gripper from that state and measuring the length of the sample after that, the following formula:
Elongation recovery rate (%) = 100-{(AB) / B × 100}
{In the formula, A: dimension before extension, B: dimension after extension. }
The recovery rate is calculated by.

(7) Specific surface area Device model: Gemini2360 (manufactured by Shimadzu Corporation) is used.
The sample is rolled into a cylinder and packed in a cell for measuring the specific surface area. The weight of the sample to be charged at this time is about 0.20 to 0.60 g. The cell containing the sample is dried under the condition of 60 ° C. for 30 minutes and then cooled for 10 minutes. After that, the cell was set in the above specific surface area measuring device, and by adsorbing nitrogen gas on the sample surface, the following BET relational expression:
P / {(V (P0-P)} = 1 / (Vm × C) + {(C-1) / (Vm × C)} (P / P0)
{In the formula, P is the adsorption equilibrium pressure, V is the adsorption amount at the adsorption equilibrium pressure, P0 is the saturated water vapor pressure (Pa), and Vm is the adsorption amount of the monolayer (mg /). g), and C is a parameter (−) <0 relating to heat of adsorption or the like. This relational expression holds particularly well in the range of P / P0 = 0.05 to 0.35. } Is applied to obtain the specific surface area value. The BET relational expression is an expression expressing the relationship between the adsorption equilibrium pressure P and the adsorption amount V at that pressure when the adsorption equilibrium state is reached at a constant temperature.

(8) Metsuke (g / m ² )
A sample is cut into a shape of 10 cm in length × 10 cm in width, and converted into mass per unit area to obtain the value.

(9) Porosity (%)
The porosity is calculated by the following formula:
Porosity (%) = [1- {Metsuke / (thickness x material density)}] x 100
Calculated by

(10) Chemical coating evaluation (exudation of chemicals, etc.)
20 g of a general compress prepared by preparing methyl salicylate, dl-camphor, and l-menthol in a ratio of 6: 1.5: 1 is uniformly applied to the non-woven fabric surface of a stretchable laminate cut into 10 cm x 14 cm. Paint. Whether or not the chemical has exuded to the surface of the laminated body on the stretchable base side (non-bonded surface of the stretchable base material) at the time of coating is determined by the following evaluation criteria.
OK: No drug oozing NG: There is drug oozing.

(11) Delamination After applying the poultice, the chemical surface (nonwoven fabric surface) is adhered to a person to have an elastic base material of an elastic laminate, and when peeled off with a force of 1N / 10 cm, it becomes a non-woven fabric. Whether or not the stretchable base material is peeled off is determined by the following evaluation criteria.
OK: No peeling NG: There is peeling.

[Examples 1 to 3 and Comparative Examples 4 to 8]
A polyethylene terephthalate (hereinafter referred to as PET) resin was used as a fiber material by the melt blow method, and the PET resin melted by an extruder was extruded from a spun nozzle having a spun nozzle diameter of 0.30 mm. The melting temperature of the PET resin in the extruder, the spinning gas temperature, the single-hole discharge amount of the molten resin, and the like were appropriately selected, and the thermoplastic resin was traction-thinned. Then, the elastic base material, which is a circular knitted fabric of the Tenjiku structure, and the obtained non-woven fabric were calendar-processed.

[Examples 4 and 5, Comparative Example 9]
A polypropylene (hereinafter referred to as PP) resin was used as a fiber material by the melt blow method, and the PP resin melted by an extruder was extruded from a spun nozzle having a spun nozzle diameter of 0.30 mm. The melting temperature of the PP resin in the extruder, the temperature of the spinning gas, the single-hole discharge amount of the molten resin, and the like were appropriately selected, and the thermoplastic resin was traction-thinned. Then, the elastic base material which is a woven fabric and the obtained non-woven fabric were calendar-processed.

[Comparative Examples 1 and 2]
A PET resin was used as a fiber material by the melt blow method, and the PET resin melted by an extruder was extruded from a spout nozzle having a spout nozzle diameter of 0.30 mm. The melting temperature of the PET resin in the extruder, the spinning gas temperature, the single-hole discharge amount of the molten resin, and the like were appropriately selected, and the thermoplastic resin was traction-thinned.

[Comparative Example 3]
The elastic base material used in Example 1 was obtained without laminating with a non-woven fabric.
Table 1 below shows various physical properties of the fabrics obtained in the above Examples and Comparative Examples.

The stretchable laminate according to the present invention has sufficient tensile strength even if it is thin, has little chemical exudation, and does not cause delamination. Therefore, it is intended for fixing to a person, attaching a cloth, or the like. It can be suitably used as a stretchable material in the medical field that requires a high holding ability of chemicals and the like.

Claims (11)

A stretchable laminate in which a non-woven fabric and a stretchable base material are joined by embossing, the thickness of the stretchable laminate is 0.02 mm to 3.0 mm, and the stretchable laminate is as follows. formula:
0.3 ≤ 1000 x ventilation resistance (kPa · s / m) / {embossing rate (%) x formation index} ≤ 2.3
An elastic laminate characterized by satisfying. The stretchable laminate according to claim 1, wherein the embossing rate is 5% to 65%. The stretchable laminate according to claim 1 or 2, wherein the airflow resistance of the stretchable laminate is 0.1 kPa · s / m to 4.0 kPa · s / m. The stretchable laminate according to any one of claims 1 to 3, wherein the stretchable laminate has a formation index of 20 to 200. The stretchable laminate according to any one of claims 1 to 4, wherein the tensile strength of the stretchable laminate at 5% elongation is 0.01 N / 25 mm to 5.0 N / 25 mm. The stretchable laminate according to any one of claims 1 to 5, wherein the stretch recovery rate of the stretchable laminate is 60% to 100%. The stretchable laminate according to any one of claims 1 to 6, wherein the non-woven fabric has an average fiber diameter of 0.1 μm to 3 μm. The specific surface area of the nonwoven fabric is 0.1m ² /g~4.5m ² / g, stretch laminate according to any one of claims 1-7. The basis weight of the nonwoven fabric is ^{1.0g / m 2 ~40g / m 2} , elastic laminate according to any one of claims 1-8. The stretchable laminate according to any one of claims 1 to 9, wherein the non-woven fabric has a porosity of 40% to 95%. The stretchable laminate according to any one of claims 1 to 10, which is for medical use.