JP2005330646A - Method for producing coated fabric and air bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing lightweight coated fabrics useful for producing lightweight air bags, especially air bags which can be compactly packaged and are improved in expandability, flame resistance and mechanical properties. <P>SOLUTION: The method for producing coated fabrics comprises coating 1-25 g/m<SP>2</SP>elastomer on a woven fabric with a knife coater under 1-500 kgf/m contact pressure and processing by crosslinking treatment, wherein the elastomer has 5,000-200,000 mPa s viscosity and the woven fabric comprises weaving threads having 67-350 dtex total fineness and comprising 0.5-4.5 dtex single yarn and has a product of the total fineness and the number of threads per inch of 9,000-22,000 number×dtex/inch both in warp direction and weft direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for manufacturing a coated fabric excellent in friction characteristics and tear strength, and more particularly, to a coated fabric used for manufacturing a lightweight airbag excellent in deployment performance and storage property, and a method for manufacturing the airbag.

Airbags are increasingly being installed as occupant protection safety devices for automobiles. An airbag as an occupant protection safety device is usually mounted as a module including an inflator case in a narrow space such as a steering wheel or an instrument panel, so that the airbag should have a small storage capacity (compact). It is rare. An airbag having a compact storage volume uses a woven fabric woven with fine fibers as a base fabric, or changes the type or application amount of an elastomer used for coating. For example, the woven yarn of the base fabric has been reduced from 940 dtex to 470 dtex, the elastomer type has been changed from chloroprene to silicone, and the coating amount has been changed from 90 to 120 g / m ² to 40 to 60 g / m ² . The recent market demand for lighter and more compact airbags is a desire to further reduce the weight of coated fabrics by further reducing the weight of the base fabric, softening the texture, and reducing the amount of elastomer applied. In order to respond to this, it is essential to overcome the following technical issues. For example, when the application amount of the silicone resin composition is reduced, (1) the problem of ensuring non-breathing performance and (2) the flame retardancy and combustion rate qualification established by FMVSS302 due to the increase in combustion rate Two problems occur. The second is the problem of softening airbags. This problem relates to improvement in the deployment performance of a light airbag that is compactly housed in an airbag device. When the occupant is not seated at the standard assumed seating position, even if the distance between the occupant and the airbag is short, that is, when the occupant restraint grace time by the airbag is short, the airbag does not exceed several tens of milliseconds (milliseconds). The ability to quickly and completely deploy and restrain passengers is required. Thus, the problem of the flexibility of the airbag is related to an improvement to a high performance such as a smooth deployment in a short time from a more compact storage state.

As described in Japanese Patent Application Laid-Open No. 6-8779, an elastomer coating film form of a conventional airbag fabric is a form in which the elastomer is unevenly distributed and applied to the mesh portion of the fabric. If the amount of elastomer applied is 25 g / m ² or less on the fabric base fabric, the amount of elastomer applied to the yarn portion other than the mesh portion of the fabric is reduced and the single yarn of the yarn portion is not completely covered. A base fabric having a predetermined air barrier property cannot be obtained. Since the airbag originally needs a function of deploying in a short time and adjusting the occupant restraint, it is desirable that the airbag be made of a non-ventilated fabric that can completely use the gas generated from the inflator. Furthermore, in the fabric structure in which the elastomer is unevenly distributed, the coating film is torn from the thin application portion of the elastomer during the combustion test of the FMVSS 302, and diffusion of combustion gas cannot be suppressed. A coating fabric that fails will appear.

  JP-A-7-300774 discloses a coating fabric for an airbag in which a coating fabric having a coating film thickness of 5 to 20 μm of a pigment-containing silicone resin composition containing 10 wt% to 5 wt% of a pigment passes the FMVSS 302 combustion test. Is disclosed. However, since it is based on a method of forming a coating film having a thickness substantially equal to the gap by the gap between the fabric base surface and the knife of the coating head, the thickness of 5 to 20 μm after filling the irregularities on the fabric surface is used. It is understood that the coating film surface forms a flat smooth surface, and of course, the coating fabric has a high surface frictional resistance because of the smooth coating surface.

  International Publication No. WO01-09416 discloses a self-extinguishing non-coating fabric using a high-density fabric made of fine fibers (total fineness of 250 dtex or less and single yarn fineness of 4.5 dtex or less) as a base fabric. Regarding the bag, a base fabric is described in which an oil agent is applied to the bag, particularly a non-scoured fabric, and a small, lightweight and compact airbag is obtained.

  However, in a conventional airbag that can be folded lightly and small and stored in an airbag device, it combines the uniform deployment performance in a short time from the stored state when the airbag is deployed, the deployment pressure resistance, the non-venting performance, and the combustion resistance. There are no known specific attempts to design coating fabrics that can be improved.

JP 6-8799 A JP-A-7-300774 International Publication No. 01/09416 Pamphlet

  An object of the present invention is to provide a light-weight coated fabric that is useful for manufacturing a lightweight airbag that can be stored compactly and that has improved deployment performance, combustion resistance, and mechanical performance.

  In addition, the object of the present invention is to meet the demands that the deployment time is short, the deployment uniformity is excellent, the passenger can be restrained more quickly, the deployment pressure resistance is excellent, and the casing can be stored compactly in the casing of the airbag device. To realize an airbag.

  It is a more specific object of the present invention to provide a lightweight coated fabric that is soft, yet has improved friction properties and tear strength despite being non-breathably coated with an elastomer. A further object of the present invention is to provide a lightweight coating fabric that has air barrier properties that are advantageous for airbag deployment even when the amount of the elastomer coating applied is small, and that satisfies the flame retardancy and burning rate defined by FMVSS 302. There is.

  A coated fabric in which a non-breathable elastomer coating layer is formed on the surface of a conventional fabric, such as a fabric, has a sticky property on the coating surface, lacks slipperiness, and has a coefficient of friction compared to the surface of the fabric. Even in a coating fabric that uses a fabric that is remarkably large and that has a relatively small fineness due to weaving yarn as a base fabric, the base fabric fabric lacks the flexible flexibility due to the presence of the elastomer coating layer. The present inventors paid attention to this phenomenon and solved the problem of the present invention by finely modifying the shape and layer structure of the coating surface of the lightweight non-breathable coating fabric.

  The present invention relates to a non-breathable coating formed by applying an elastomer film to at least one surface of a base fabric composed of fibers having a total fineness of 67 to 350 dtex and comprising single yarns having a fineness of 0.5 to 4.5 dtex. A fabric having a non-breathable coating surface having a mean value of the coefficient of friction (MIU) of 0.01 in both the warp and warp directions in the warp and warp directions of the fabric. The coating fabric is characterized in that the difference between the coefficient of friction (MIU) in the warp direction and the coefficient of friction (MIU) in the weft direction on the coating surface is 0.15 or less in absolute value.

  The non-breathable coating fabric referred to in the present invention is non-breathable by applying an elastomer to at least one surface of a base fabric composed of fibers having a total fineness of 67 to 350 dtex composed of single yarns having a fineness of 0.5 to 4.5 dtex. A fabric having a conductive coating layer formed thereon. Here, “non-breathable” means having a gas impermeability enough to guarantee the deployment of the airbag in the airbag apparatus that is the intended application of the coated fabric of the present invention.

Here, the KES measurement method (Kawabata's evaluation system for fabric) is a literature (The Standardization and Analysis) method for measuring the basic mechanical properties of fabrics for the purpose of quantifying the “feel” of fabrics, that is, the tactile sensation felt by the human body. ^{of Hand Evaluation, 2 nd Ed.} , S.Kawabata, the Texile Machinery Society of Japan, defines a measurement method in July 1980). The coefficient of friction (MIU) by KES measurement is the same as that of the friction element when it is moved in the warp direction and the weft direction on the sample fabric held horizontally with a constant tension by the specified friction surface, and a static load is applied by the friction element. It is a coefficient of friction (MIU) value detected from applied tension (ie, frictional force). Here, the surface slip state of the coated fabric of the present invention can be evaluated by measuring the friction coefficient of KES. The measurement conditions will be described in detail later.

  The coated fabric of the present invention is modified so that the coating surface has a reduced coefficient of friction compared to the coefficient of friction of the base fabric by making the shape of the coating surface uneven and non-specular. Yes. Furthermore, the coated fabric of the present invention is also unique in that the difference between the friction coefficient in the warp direction and the friction coefficient in the warp direction on the coating surface is extremely small, and there is no slip anisotropy along the warp direction and the weft direction.

  In the present invention, as described above, since the coating fabric has improved sliding of the coating surface, it is possible to shorten the time required to deploy the airbag folded compactly. Since the coated fabric of the present invention has no anisotropy in the warp direction and the weft direction of the friction coefficient of the coating surface, the slip of the fabric surface when the airbag is deployed is substantially uniform in all directions. The difference between the deployment speeds in the direction and the weft direction is virtually eliminated, and for example, the form being deployed in a symmetrical bag such as a circular shape is also deployed in a symmetrical manner. As a result, air that can quickly and reliably restrain an occupant You can get a bag.

  The friction characteristics of the coated fabric of the present invention can be obtained by forming a coating layer having an uneven surface along the contour of the uneven shape of the surface of the base fabric such as a woven fabric. And since this coating layer is formed with hardly penetrating the inside of the cross section of the base fabric, the fabric is prevented from becoming hard due to the penetration into the elastomer fabric, and the inherent flexibility of the base fabric is utilized. At the same time, the tear strength of the coated fabric can be improved.

The coating film having this surface shape is a layer having an elastomer solid content of 1 to 25 g / m ² applied on the base fabric surface, and is formed with a film thickness ratio of less than 3 between the maximum film thickness portion and the minimum film thickness portion. Is an elastomer layer. Although the coated fabric of the present invention has a predetermined modified surface, there is no destruction of the ashing combustion film from the thin part of the film, and there is no spread of fire due to diffusion of combustion gas, so that the combustion resistance that passes the FMVSS302 combustion test Have sex.

  As for the surface characteristics of the coated fabric of the present invention, the surface roughness (Ra) of the coated surface is 1.5 to 12 μm. The surface roughness (Ra) indicates that the surface of the coated fabric is also uneven. Here, the surface roughness (Ra) is measured using a laser reflection displacement meter LT-8010 manufactured by Keyence Corporation as a probe ( 2 μmφ spot diameter) This is a measured value of the uneven height displacement of the coating surface measured by a three-dimensional shape measuring machine. The stylus surface roughness (SMD: mean deviation of the thickness <unit: micron>) in the KES measurement in the warp direction and the weft direction of the coating surface is specified as 2 to 10 μm. The stylus surface roughness in KES measurement evaluates the sensation roughness of the coated fabric when the coated fabric comes into contact with the human body, and the stylus surface roughness (SMD) in KES measurement is the KES specified contactor. It is a value represented by the standard deviation of the vertical displacement of the contact when the surface roughness is detected from the vertical movement of the contact placed on the sample.

The coated fabric of the present invention is composed of a woven yarn having a total fineness of 67 to 350 dtex composed of a single yarn having a fineness of 0.5 to 4.5 dtex, and the woven fineness expressed by the product of the woven density and the woven yarn fineness is warp direction. And an elastomer having a viscosity of 5,000 to 200,000 mPa · s with a knife coater under a contact pressure of 1 to 100 kgf / m. It can be produced by applying 25 g / m ² at a relative speed of the coating head of 1 to 100 m / min, preferably 10 to 50 m / min, followed by crosslinking treatment.

  By using the coated fabric manufactured by the manufacturing method of the present invention, the deployment time is short and there is no deployment anisotropy for all types of airbags, such as for driver seats and passenger seats, so that quick response at the time of collision is achieved. An excellent and light airbag that can be compactly stored in an airbag device can be manufactured.

Hereinafter, the present invention will be specifically described.
The coated fabric of the present invention may be a single-sided coated fabric in which the coating is coated on one side of the fabric or a double-sided coated fabric coated on both sides of the fabric.

  In the coated fabric of the present invention, the coated surface of the elastomer has a KES measurement coefficient of friction (MIU) of 0.01 to 0.3, more preferably 0.05 to 0.25 in both the warp direction and the weft direction. By setting the coefficient of friction (MIU) to 0.3 or less, the sliding of the coating surface is improved in the deployment of the airbag, and the deployment time of the airbag folded compactly can be shortened.

  An airbag obtained by using a coated fabric having a coating on one side of the fabric is usually a bag body sewn so that the coated surface of the fabric is on the inside. The bag body is folded and stored in the casing of the airbag in the airbag apparatus. Thus, when the airbag is deployed, the sliding between the coated surfaces of the coated fabric and the sliding between the non-coated surfaces occur simultaneously, and the poor sliding between the coated surfaces inhibits the shortening of the deployment time. Here, there is a significance of improving the friction characteristics of the coating surface.

  In the coated fabric of the present invention, the difference between the friction coefficient (MIU) in the warp direction on the coating surface and the friction coefficient (MIU) in the weft direction is 0.15 or less. Since the surface texture in the warp direction and the weft direction changes depending on the tension history of the manufacturing process, the base fabric is often anisotropy in the warp direction and the weft direction. In the present invention, by forming a unique coating layer, the degree of anisotropy of the frictional characteristics of the surface is reduced, and the difference in the coefficient of friction (MIU) between the warp direction and the weft direction of the coated fabric is 0.15 or less. can do. If the difference in coefficient of friction (MIU) on the coating surface of the coated fabric is 0.15 or less, the deployment uniformity is good in the deployment of the airbag. That is, the sliding of the fabric is uniform and there is no difference between the deployment speeds in the warp direction and the weft direction. For example, in a bag having a symmetrical shape such as a circular shape, the form being deployed is also developed symmetrically. You can get ready.

  In the present invention, the KES measurement method for detecting the frictional characteristics of the cloth surface is as follows. The sample cloth is attached to the surface of the KES-defined friction element, moved on the sample cloth held horizontally with a constant tension, and the friction element. According to this method, the tension applied to the friction element (that is, the friction force) in a state where a static load is applied is detected. At that time, the cloth on the surface of the friction element and the cloth held horizontally were the same sample, and the warp direction and the weft direction were matched to obtain the friction coefficient (MIU) value in the warp direction and the weft direction.

  The frictional behavior of the coated surface of the coated fabric of the present invention is basically derived from the uneven shape of the ridge formed by the fabric texture and stitches of the fabric. It is important for controlling the predetermined coefficient of friction of the present invention that the elastomer on the coating surface is applied along the uneven shape on the surface of the base fabric formed by the woven and knitted structure and the fibers. The uneven shape of the coating surface can be specified by the surface roughness (Ra) by laser measurement.

  In order to obtain the coefficient of friction of the predetermined surface of the present invention, the surface roughness (Ra) of the coating surface may be 1.5 μm or more, preferably 1.5 to 12 μm, more preferably 2 to 10 μm.

  The surface coated with an elastomer often has adhesive properties and has a high frictional force as exemplified in Comparative Example 4 described later when the surface form is a mirror shape. The surface shape in the range of the surface roughness (Ra) is also the surface shape that achieves the low coefficient of friction (MIU) specified by the present invention.

  The stylus surface roughness (SMD) in the KES measurement in the warp direction and the weft direction of the coated surface of the coated fabric of the present invention is preferably 2 to 10 μm, more preferably 2.4 to 8 μm. The stylus surface roughness (SMD) by the KES measurement method is a surface roughness detected by moving the contactor up and down by placing a specified contact on the sample to measure the texture roughness felt by the human body. The average deviation of the vertical displacement of the contact output using the circuit is obtained, and a low friction surface having a predetermined friction coefficient (MIU) of the present invention can be obtained with a coating surface shape of 10 μm or less.

  The coating fabric according to the present invention provides non-breathability by covering the entire surface of the base fabric in such a manner that the coating film forming the uneven surface covers the entire surface of the base fabric in a manner in which the penetration of the elastomer into the base fabric fiber is minimized. Has been. As described later, the formation of the coating surface roughness depends on the coating process conditions, and the surface roughness preparation conditions are related to the flexibility, tear strength, and flame resistance of the coated fabric. When the penetration of the elastomer occurs, even the shape of the single yarn fiber constituting the fabric appears clearly on the coating surface. Therefore, the surface roughness is expressed by the average cross-sectional area of peaks and valleys (Ra). growing. Therefore, if the value of the surface roughness (Ra) is 12 μm or less, the significant penetration of the coating is suppressed, and the fabric has an effect of improving the surface roughness by the coating film. First, an improvement in tearing strength is achieved by ensuring that the coating elastomer does not penetrate into the fabric and the coating film is reliably present on the fabric surface. When the coating penetrates into the fibers of the fabric, the mutual binding of the single yarns in the fibers is too strong, and the constituent fibers approach the behavior of cutting one by one at the tip where tearing occurs. On the other hand, when there is no penetration of the coating, the constituent fibers are attracted and bundled by the coating film at the tip where tearing occurs, and a plurality of pieces are cut. Therefore, the tearing strength of the fabric is improved by the coating film having little penetration into the single yarn fiber. Next, such a coating film sufficiently satisfies the non-venting performance and contributes to shortening the development time. Furthermore, the coating layer formed on the surface layer of the fabric is a strong film having no extremely thin film thickness, and can satisfy the required performance of passing the combustion test as defined by FMVSS302.

  According to the observation of the horizontal combustion behavior of the FMVSS 302, when the fabric is ignited, the spread of fire is suppressed when the coating film of the elastomer can firmly maintain the form. Conversely, it has been found that if the coating film bends or cracks during combustion, it will spread. Even a coated fabric made of a light thin film, it is possible to obtain a fabric that can maintain a strong form during combustion and pass a combustion test because the coating layer is formed without penetrating the fabric. It was.

  The film thickness of the coating film made of elastomer in the coated fabric is preferably as uniform as possible. It is preferable that the thickness of the woven fabric portion where the thickness is the thickest is less than 3 with respect to the thickness 1 of the woven yarn portion where the resin thickness is the thinnest. More preferably, the film thickness ratio between the maximum film thickness portion and the minimum film thickness portion is 2 or less. If the film thickness variation of the coating film is within this range, the ashing combustion film in the thin part of the film will not be broken during combustion, and the combustion gas will not diffuse and spread from there, Pass the FMVSS302 flammability test.

The coated fabric of the present invention has a bending rigidity per unit length (B: Bending rigidity per unit length (unit: m N.cm ² / cm)) of 0.5 to 9 mN ·· according to KES measurement. Preferably it is cm ² / cm. More preferably, it is 1.5-8.5 mN * cm < ² > / cm. The coating cloth having the low bending rigidity in this range is excellent in foldability and can further reduce the storage capacity of the airbag.

The bending stiffness (B) measured by the KES measurement method uses a pure bending tester (KES-FB2) to bend the entire fabric sample into an arc with a constant curvature, change the curvature at a constant speed, and generate a bending moment. Is a value obtained by measuring. For each warp direction and weft direction of the fabric, obtain a reciprocal curve of “bending moment-curvature” in the front and back directions, and obtain the bending rigidity value of each reciprocation from the gradient of the straight line centering on zero curvature. The average is obtained as a value per unit width of the coated fabric. A smaller bending stiffness (B) in both the warp and warp directions of the fabric indicates that the fabric is more flexible. If the bending rigidity (B) is 9 mN · cm ² / cm or less, the folded shape is small, and a more compact folded shape can be produced, and the folding workability of the airbag is good. There is no need to spend too much time on compact folding. The bending stiffness of the coated fabric contributes to easy deployment and soft contact with the occupant.

  In the present invention, the base fabric constituting fiber of the coated fabric is not particularly limited, but a fiber mainly composed of polyhexamethylene adipamide is preferable, and in particular, polyhexamethylene adipamide (hereinafter referred to as nylon 66) fiber, nylon Particularly preferred in view of heat resistance is 66 copolymer (nylon 66/6, nylon 66 / 6I, nylon 66/610 etc.) fiber and nylon 66 fiber blended with nylon polymer (nylon 6, nylon 610 etc.). .

  These fiber materials may contain various commonly used additives in order to improve productivity or properties in the production process and processing process of the raw yarn. For example, a heat stabilizer, an antioxidant, a light stabilizer, a smoothing agent, an antistatic agent, a plasticizer, a thickener, a pigment, a flame retardant, a delustering agent, and the like can be included.

  The tensile strength of the fibers constituting the coated fabric of the present invention is preferably 6 cN / dtex or more, more preferably 6.5 cN / dtex or more. The airbag obtained at a tensile strength of 6 cN / dtex or higher will exhibit the pressure resistance required at the time of deployment. Particularly preferred tensile strength is 6.5 cN / dtex or more. The higher the tensile strength of the fiber, the better. However, 10 cN / dtex is a practical upper limit from the viewpoint of fiber spinning.

  In the coated fabric of the present invention, a woven fabric, a knitted fabric, a non-woven fabric, or the like is used as a base fabric. A suitable base fabric is a woven fabric having a structure such as a plain weave, a lattice weave, or a weave. The weaving method of the base fabric is not particularly limited, and general-purpose air jet weaving, water jet weaving, rapier weaving, weaving with a multiphase loom, or the like can be used. From the viewpoint of productivity, weaving by air jet weaving or water jet weaving is particularly preferable.

  The base fabric is preferably a woven yarn used as a weft preferably having a fineness of 0.5 to 4.5 dtex, more preferably a multifilament having a total fineness of 67 to 350 dtex composed of a single yarn of 1 to 3.5 dtex. A long-fiber woven fabric using filament yarn, and a long-fiber woven fabric using a total fineness of preferably 67 to 250 dtex, more preferably 100 to 250 dtex. Here, the total fineness of the woven yarn refers to the sum of the single yarn fineness per warp and weft woven yarn used when composing the woven fabric. If the total fineness in this sense is within 350 dtex, a lightweight and compact airbag can be obtained. When the total fineness is 67 dtex or more, the mechanical properties during the operation of the airbag such as the tensile strength and tearing mechanical properties of the coated fabric are satisfied. A coated fabric obtained by using a base fabric made of fibers having a single yarn fineness of 4.5 dtex or less is soft and easy to bend, and is suitable for manufacturing an airbag that can be folded and stored compactly in a casing of an airbag device. It is a fabric. The fibers constituting the warp or the weft in the woven structure of the woven fabric may be a plurality of yarns such as twisted yarns, combined yarns, and aligned yarns.

  The base fabric used for the coated fabric of the present invention has a total fineness and a weave density of fibers constituting the fabric in each of the warp direction and the weft direction (represented by the number of warps or wefts / 2.54 cm). Product, that is, the weaving fineness is preferably 9,000 to 22,000 dtex · line / 2.54 cm, more preferably 10,000 to 20,000 dtex · line / 2.54 cm. Most preferably, it is 12,000 to 19,000 dtex · line / 2.54 cm. When the weaving fineness is 22,000 dtex / line / 2.54 cm or less, the light weight and compactness of the airbag can be obtained, and a sufficient pressure tension can be applied at 9,000 dtex / line / 2.54 cm or more. By using this fabric base fabric, an airbag coating fabric that satisfies the mechanical properties at the time of airbag operation such as tensile strength and tearing mechanical properties can be obtained.

  In the present invention, the elastomer for coating may be a commonly used elastomer such as chloroprene, chlorosulfonated olefin, silicone rubber, polyamide elastomer, styrene butadiene resin, nitrile rubber, fluorine rubber, polyurethane and the like. it can. Of these, silicone rubber having heat resistance, cold resistance and flame retardancy is particularly preferable. The coated elastomer composition may contain a commonly used thickener, flame retardant, filler, stabilizer, and the like. For the convenience of distinguishing the front and back surfaces of the fabric, the coated fabric can also be given an identification color with a pigment or dye on the coating film.

The coating is preferably formed at an applied solid content of 1 to 25 g / m ² , more preferably 5 to 22 g / m ² . By applying as little elastomer as possible, the total thickness of the coating fabric can be reduced, and a soft and inexpensive coating fabric can be obtained. A coating surface having an uneven shape peculiar to the present invention can be obtained with a coating film having a solid content of 25 g / m ² or less. It is necessary to select an application amount condition of the elastomer capable of forming a non-breathable film in accordance with the woven structure of the base fabric and the surface form of the woven fabric corresponding to the fineness of the woven yarn. The mass per unit area of the coated fabric referred to in the present invention is preferably 200 g / m ² or less and the thickness is 0.30 mm or less in order to improve the lightweight and compactness of the airbag.

The coated fabric of the present invention comprises a woven yarn having a total fineness of 67 to 350 dtex composed of a single yarn having a fineness of 0.5 to 4.5 dtex, and the woven fineness expressed by the product of the woven density and the yarn fineness is warp direction. In addition, a woven fabric having 9,000 to 22,000 yarns / dtex / 2.54 cm in both the weft direction and an elastomer having a viscosity of 5,000 to 200,000 mPa · s under a linear pressure (contact pressure) of 1 to 500 kgf / m. It can manufacture by apply | coating 1-25 g / m < ² > with a coater and carrying out a crosslinking process.

  As the coating liquid (dope), an elastomer composition such as an organic solvent dilution type, an aqueous emulsion type, or a solventless type is used. In order to realize the coating film surface form of the present invention, it can be achieved by selecting an appropriate viscosity range, contact pressure condition, and coating head shape according to each coating liquid. In particular, coating using a solventless elastomer composition is preferred as a method for forming the surface morphology of the coating film of the present invention. In the coating method using a solvent-free elastomer composition substantially free of an organic solvent diluent, the viscosity of the coating liquid is preferably 5,000 to 200,000 mPa · s, more preferably 10,000 to 100,000 mPa · s. s. If the viscosity of the elastomer composition is 5,000 mPa · s or higher, the higher the viscosity, the more the coating can be prevented from penetrating into the fiber. Usually, light-weight coating becomes difficult at a viscosity of 200,000 mPa · s or more. In the organic solvent type, since the solvent increases the permeability to the fabric, it is necessary to adjust the coating liquid to a higher viscosity. For example, it is necessary to increase the coating liquid to 50,000 mPa · s or more, preferably 80,000 mPa · s or more by a method such as increasing the molecular weight of the elastomer. Even in the water-based emulsion type, since water increases the permeability to the fabric, it is necessary to adjust the coating liquid to a high viscosity. It is necessary to adjust to 10,000 mPa · s or more by adding an appropriate thickener such as carboxymethyl cellulose salt as appropriate.

  As a coating method, a contact pressure type coating is used. Various general knife coats, roll coats, reverse coats and the like can be used. The coating method (gap method) in which a gap is provided between the base fabric and the coating head is difficult to control with a small amount of coating, and also provides a coated surface in which irregularities of the fiber structure by weaving and knitting are expressed. I can't. The contact pressure condition in knife coating is preferably 1 to 500 kgf / m, more preferably 20 to 200 kgf / m in terms of linear pressure. The coating amount on the base fabric can be controlled to be lighter than the gap method at 1 kgf / m or more. The higher the pressure, the lighter the coating becomes possible. Furthermore, a coating surface that takes advantage of the uneven shape of the fiber-constituting fold can be obtained. In the present invention, since the coating head flattens the unevenness of the fabric at the moment of coating, the coating film is applied with a uniform film thickness, and the unevenness of the base fabric surface recovers after the coating head passes, A coating surface that follows the shape is formed. Furthermore, if the contact pressure is 500 kgf / m or less, the coating can be satisfactorily performed. The contact pressure condition can be appropriately set according to properties such as the viscosity of the elastomer, the coating head shape, the type of coating liquid, and the like. The portion where the coating head is in contact with the fabric is related to the substantial contact pressure. For example, with a knife, the thickness may be selected from about 2 mm to about 50 μm, but the smaller the thickness, the higher the substantial contact pressure. The uneven shape can be formed by application of lighter weight. The tip of the coating knife may be semicircular, right-angled or concave, and the radius of the semicircular shape is 0.05 to 1.0 mm, and the right-angled corner radius is selected to be less than 0 to 1.0 mm. That's fine. The coating speed is preferably 1 to 100 m / min, more preferably 10 to 50 m / min. The upper limit of the coating speed is a speed that is sufficient for the cross-linking treatment residence time to complete the cross-linking until the elastomer lowers the tackiness.

  The crosslinking process subsequent to the coating may be performed according to the elastomer crosslinking system. For example, in the case of crosslinking with an addition type crosslinking agent with silicone rubber, a heat treatment at about 150 to 230 ° C. is performed for 0.1 to 5 in order to volatilize the inhibitor agent of the catalyst for the crosslinking reaction and accelerate the initiation of the addition reaction. Apply for about a minute.

  The amount of oil agent attached to the base fabric fabric (100 fraction of the mass of the oil agent to the total mass of the mass of the fabric and the oil agent) is 0.8 wt% or more, so that the coating solution is immersed in the fabric. A method of suppressing the penetration and forming a uniform film thickness coating along the fiber irregularities of the fabric is also preferable. A decrease in friction on the coating surface can be exhibited. When the adhesion amount of the oil agent is 0.8 wt% or more, the coating liquid can be repelled to prevent permeation into the fabric. If the amount of the oil agent is 8 wt% or less, the adhesion between the coating elastomer and the fabric is not impaired.

  Oils allowed to adhere to the base fabric include spinning oils and warping oils. The amount of the oil agent attached means the total amount of these oil agents attached to the coated fabric. As a method of attaching an oil agent to a base fabric, there are a method of using a fabric by dipping and attaching an oil agent, and a method of using the fabric without attaching it to the raw yarn before forming the fabric. In the present invention, when the base fabric is a woven fabric, it is preferable that the oil agent is woven after the oil agent is attached to the original yarn in advance before weaving the fabric, and the oil agent is left without scouring the raw machinery. Furthermore, when non-glue fabric yarn is woven by air jet and used as a base fabric without scouring, it is used as a base fabric with oil that keeps the oil evenly attached without losing the oil added to the yarn. It is preferable because it is possible. In addition, when using a heat-resistant smoothing agent as a spinning fluid to be attached to the woven fabric yarn at the fiber production stage, the smoothing agent is mainly composed of dialkylthiodipropinate, which is PO / EO alkyl polyether and POE curing. A castor oil trialkyl ester emulsifier may be used in such a combination that the mixing ratio with the main component is 40 wt%.

  When the base fabric is a woven fabric, the warping oil provided for the purpose of improving the weaving property can be used as it is. In the case of using a warp oil, 0.5 to 5.0 wt% of the warp oil may be attached to the warp within the range of the amount of the oil agent described above. The warping oil agent is preferably a heat-resistant oil agent having a heating weight loss difference of 2 wt% or less and capable of preventing fogging of automobile window glass. Specifically, high flash point mineral oil, synthetic paraffin And what has glycerin ester as a main component is preferable. In addition, a heating weight loss rate difference is calculated | required as follows. Prepare two samples of 1 g of oil in a 6 cm diameter aluminum dish, and measure the mass after heating them on individual hot plates at 120 ° C. and 150 ° C. for 10 minutes, respectively. The weight loss rate difference is calculated. In the present invention, it is preferable in terms of weaving that the amount of oil applied is equal between the warp and the weft, or that the warp is more adhered than the weft. From the viewpoint of weaving efficiency, the warp is 0.1 wt. It is particularly preferable that the amount be at least%. Furthermore, an antibacterial agent can be added to the oil agent to prevent mold when the fabric is left for a long period of time. The antibacterial agent is not limited in its kind and amount added as long as it does not harm the stability of the warping oil. A mixture of isothiazolone chloride, isothiazone, bromonitrile alcohol, etc. may be added in an amount of 0.02 to 0.5 wt% with respect to the warping oil.

  Prior to applying the coating, the base fabric can be calendered. The application of the calendar prior to coating has an advantage that the roughness of the base fabric can be appropriately adjusted within a range where the surface does not become a mirror surface. By calendering, the surface of the fabric can be coated with a smaller amount of elastomer applied, and a design capable of expressing an appropriate uneven shape can be realized.

The calendering may be any of hot compression, room temperature compression, cold compression, etc., but hot compression is preferred. The heating temperature (calendar roll) in the calendar process of hot compression can be determined by a combination with the applied pressure below the melting point of the fiber material. From the viewpoint of fixing the polymer structure of the base fabric constituting fiber, 150 to 220 ° C. is preferable. The processing pressure is preferably a linear pressure of 1 to 100 kgf / cm. The processing speed can be appropriately selected, but is preferably 1 to 30 m / min. Various methods such as a roll method of compressing between rolls and passing at a constant speed and a method of compressing for a fixed time with a pressure press can be adopted as the method of pressure compression. As the calender roll, a roll having a flat surface and a press material can be appropriately selected from metal, ceramic, paper, elastomer, plastics, etc., and a combined roll may be used. By appropriately improving the roughness within a range where the surface of the base fabric does not become a mirror surface, it is possible to obtain a coated fabric having coating surface characteristics with a smaller amount of coating.
Next, the present invention will be specifically described by way of examples.

  In the examples, “parts” represents parts by weight. In addition, the evaluation method of the coating fabric and airbag in an Example and a comparative example is as follows.

(1) Woven density Measured according to JIS L-1096 8.6.1.
(2) Coating weight A sample having an area (A) equivalent to about 0.3 m square is collected and weighed from the fabric and dried at 105 ° C for 2 hours or more. Then degrease with dichloromethane and dry. This was dissolved in 200 g of 90% formic acid at room temperature for 3 hours, the insoluble matter was filtered off with a glass sintered filter (glass filter 17G-3 manufactured by Beadrex Co., Ltd.), and thoroughly washed with formic acid and water. Dry, and measure the dry mass of undissolved portion at 105 ° C. for 2 hours (M). The coating weight (g / m ² ) was obtained by dividing the formic acid insoluble matter (M) by the area (A) of the fabric sample.

(3) Tear strength The tear strength of the fabric before coating and after coating was measured according to JIS L-1096 6.15.1 (single tongue method).

(4) Friction coefficient (MIU: mean value of the coefficient of friction (unit: non))
Using a surface testing machine (KES FB4), the coated fabric (width 20 cm, length 20 cm) was subjected to KES standard conditions (The Standardization and Analysis of Hand Evaluation, 2nd Ed. S. Kawabata, The Textile Machinery Society of Japan, July 1980. ) And measured.
The same sample fabric (horizontal holding tension: 20 gf / h) was used, using a contact defined by KES literature (10 piano wires having a diameter of 0.5 mm are arranged), and a sample fabric was affixed to the contact. cm) was used to obtain the value obtained. The contact load at this time was 50 gf, and the measurement scanning speed was 0.1 cm / sec. In the measurement, the average of n = 5 times was obtained by changing the location in the sample. Further, in addition to various conditions stipulated by KES, a device for measuring the friction between fabrics was devised. That is, in one of them, an 8 mm square of the coated fabric piece of the material was attached to the friction surface of the friction element. Next, when holding the cloth to be rubbed horizontally, the longitudinal direction and the weft direction of both the sample cloth and the horizontally held sample cloth are matched to the friction element, and the respective friction coefficients of the longitudinal friction and the weft friction are measured. did.

(5) Surface roughness (Ra)
Using a laser reflection displacement meter LT-8010 (2 μmφ spot diameter) manufactured by Keyence Co., Ltd. as a probe, a cloth is measured using a three-dimensional shape measuring machine (stage: LMS-3D 500XY (H)) manufactured by Sigma Koki Co., Ltd. Surface unevenness was measured as height displacement by XY scanning the surface. The surface roughness (Ra) of JIS B-0601 was calculated using a calculation software “LMS 3D” with a value that does not set a cutoff. The measurement range was 4000 μm square. First, continuous scanning in the longitudinal direction was performed at intervals of 20 μm, and then the longitudinal direction was measured by moving 20 μm to the weft. Next, after continuously scanning in the weft direction and measuring at intervals of 20 μm, the weft direction was measured after moving by 20 μm, and this was repeated. In other words, 40401 points were measured by sampling the height displacement at lattice points at intervals of 20 μm. At this time, the surface roughness was calculated by first averaging the surface roughness values obtained by continuous scanning in the warp direction in the weft direction to obtain the surface roughness (Ra) w. Next, the surface roughness values obtained by continuous scanning in the weft direction were averaged in the warp direction to obtain the surface roughness (Ra) f. Finally, the surface roughness (Ra) of the sample surface was determined from the average of both methods.
Measurement range: 4000 μm square Measurement point: 40,401 points (20 μm pitch)

(6) stylus surface roughness (SMD: mean deviation of surface roughness (mean deviation of the thickness (unit: micron)))
Using a surface testing machine (KES FB4), coated fabric (width 20 cm, length 20 cm) was subjected to KES standard conditions (The Standardization and Analysis of Hand Evaluation, 7.2nd Ed. S. Kawabata, 8. The Textile Machinery Society of Japan, 9.1980 ). The measurement conditions were a KES specified contact (consisting of a 0.5 mm diameter piano wire) attached to the device, contact load 10 gf, pressure spring constant 25 gf / m, measurement 0.1 cm / sec, holding tension of horizontal holding fabric sample Was 20 gf / cm. For the measurement, the average of n = 5 times was obtained by changing the sample.

(7) Bending rigidity per unit length (unit: mN · cm ² / cm)
The measurement was performed under KES standard conditions with a pure bending tester (KES FB2) except that the coated fabric was 5 cm wide and 10 cm long.

(8) Weight per unit area of coated fabric Measurement was performed according to JIS L-1096 8.4.
(9) Thickness of coating fabric It measured according to JIS L-1096 8.5.
(10) Burning rate It measured according to FMVSS302 method (horizontal method).
(11) Air permeability Measured according to JIS L-1096 6.27.1 A method (Fragile method).

(12) Compactness (Airbag folding thickness)
A planar airbag 10 (capacity: 60 liters, 15 in the figure being a gas introduction hole) prepared by a sewing method based on the description of International Publication WO99 / 28164 is shown in FIG. As shown, the edges a and b are butted on the center line cd and folded in a bellows shape so that folds and folds are formed along lines α, β and γ (equal intervals), and intermediate folding A piece 20 (e, f, and g in FIG. 6 (B) reference view are folding edge peripheral edges) is formed. The intermediate folding piece 20 is folded in a bellows shape so that a fold mountain and a fold valley are formed along the lines α ′, β ′, and γ ′ by matching the c edge and the d edge with the center line ab. Folding package 2 (see FIG. 7) is prepared. In FIG. 7, α ′, β ′ and γ ′ indicate folds or valleys formed by folding along these lines in the package 2.
Next, as shown in FIG. 7, the folded airbag is placed on the flat table 4, a 300 mm square glass plate 3 is placed thereon, a load is applied with a 1 kg weight 5, and an average thickness X is measured after 30 minutes. (Mm) was measured.

(13) Deployment time (high-speed VTR observation)
A driver's seat airbag (60 liters) described in the specification of WO99 / 28164 was sewn and a module with an inflator (non-azide type, maximum tank pressure of 185 kPa) was attached, and a deployment test was performed at room temperature. However, the warp and weft directions of the fabric on the front and back of the bag were matched to sew.
The deployment status is recorded with a high-speed VTR. When viewed from the front, the distance from the center of the outer periphery reached at the point of 48 msec in all directions, that is, the time when it has reached 98% of the deployment distance is defined as the completion of deployment. The time from the start to the completion of deployment was defined as the deployment time.

(14) Uniformity of airbag deployment (high-speed VTR observation)
A driver's seat airbag (60 liters) described in the specification of WO99 / 28164 was sewn and a module with an inflator (non-azide type, maximum tank pressure of 185 kPa) was attached, and a deployment test was performed at room temperature. However, the warp and weft directions of the fabric on the front and back of the bag were matched to sew.
The deployment status is recorded with a high-speed VTR, the deployment pattern at the time of 14 msec and 19 msec from the start of deployment is observed, and the sample that is deployed with the deployment shape viewed from the front maintained in a circular shape is uniformly deployed. Based on the evaluation.
○: Uniform development (examples shown in FIGS. 1 and 2)
When a clear expansion delay is not observed in the entire circumferential direction, and expansion is performed in a convex shape without causing a dent in the outer periphery of the expansion.
X: Uneven development (examples shown in FIGS. 3 and 4)
When there is a development delay in the entire circumference and there is a clear dent in the outer circumference of the deployment.

  In addition, FIGS. 1 to 5 show examples of the process of observing the deployment operation state of the driver's seat airbag as viewed from the front using the high-speed VTR in the airbag deployment test. FIGS. 1 to 5 show the deployment operation status from the start of deployment in the deployment test of the driver airbag to the complete deployment, and the time course of the deployment operation observed with a high-speed VTR from the front of the deployment bag of the deployed airbag. FIG.

(15) Evaluation of developed pressure resistance The airbag for a driver's seat (60 liters; provided with no vent hole) described in WO99 / 28164 was sewn and attached to a high-pressure tank test apparatus. The gas pressure of various pressures is instantaneously introduced from the high-pressure tank to the air bag at room temperature to obtain the time until the bag breaks, and the maximum pressure inside the airbag under the gas pressure condition when the bag is broken at 100 msec, that is, The airbag deployment pressure resistance (kPa) was determined.

(Examples 1-9 and Comparative Examples 1-9)
Nylon 66 was melt-spun with an extruder-type spinning machine, and after attaching a spinning oil, it was hot-drawn to obtain a nylon yarn. This yarn had a tensile strength of 7.7 cN / dtex, an elongation of 21%, and an adhesion amount of oil of 0.5 wt%.

  The spinning oil was supplied by a nozzle oiling method as a 22 wt% emulsion of “40 parts dialkylthiodipropinate, 30 parts PO / EO alkyl polyether, 30 parts POE hydrogenated castor oil trialkyl ester”.

  When warping this yarn, S560 (manufactured by Kyoyo Chemical Industry Co., Ltd .; difference in heat loss ratio of 150 ° C. and 120 ° C. 1.3%) was applied by a kiss roll method as a warping oil agent, A warp preparation such as beaming was performed so that the adhesion amount was 1.0 wt%, and a woven fabric was obtained by weaving with an air jet loom weaving machine (AJL).

The fabric was heat-set at 170 ° C. without scouring.
Using a knife of various widths, a linear pressure of 50 kgf / m was applied to the fabric by the floating knife method, and a silicone resin was coated on one side at a speed of 10 m / min. After coating, the coated fabric was obtained by heat treatment in a dryer at 180 ° C. for 3 minutes. Here, silicone is 100 parts “LR6200A / B” manufactured by Asahi Kasei-Wacker Co., Ltd., 3 parts of an organosilicon compound (“HF86” manufactured by Asahi Kasei Wacker Co., Ltd.) as an adhesion assistant, and a viscosity of 20,000 mPa · s. (Composition A). However, in Comparative Example 9, various evaluations were performed without performing coating.

Table 1 shows the characteristics of the yarns used in Examples 1 to 9 and Comparative Examples 1 to 9, the evaluation results of the obtained fabrics, and the results of sewing and developing the airbags.

  A cross-sectional SEM photograph of the coated fabric of Example 2 is shown in FIG. FIG. 8 shows that the surface shape of the coating film of the coated fabric is formed in a shape conforming to the irregular shape on the surface of the base fabric, and it can be seen that the contact area when the fabric is rubbed is small. And the friction coefficient of the coating surface of the coating fabric in Example 2 is low. The airbag manufactured with the coated fabric of Example 2 has a short deployment time and a small difference in friction coefficient between the warp direction and the weft direction, so that the airbag deployment uniformity is good.

Example 2 and Comparative Example 9 are compared. Comparative Example 9 shows evaluation data of the base fabric of Example 2 itself. The coating fabric of Example 2 was completely non-ventilated by the elastomer coating, and the friction coefficient was reduced, and the friction coefficient difference between the warp direction and the weft direction was improved to be small. Bag deployment time has been shortened. On the other hand, Comparative Example 5 is a coated fabric in which a relatively large amount of conventional coating is applied to the fabric. The coating surface of Comparative Example 5 is flat as shown in the cross-sectional SEM photograph in FIG. And the contact area in the case of the friction of a fabric is large, and the friction coefficient of a fabric is high. The airbag using the coated fabric of Comparative Example 4 has a low deployment speed and takes time to deploy. As shown in Comparative Example 4, when the coating weight is reduced, the friction coefficient starts to be reduced, but is still insufficient. Rather, the difference in friction coefficient between the warp direction and the weft direction is emphasized, and the development uniformity is inferior. Comparative Example 7 shows high friction even when the coating weight is as small as 21 g / m ^{2. Since} the total fineness of the woven fabric is low, the unevenness of the fiber structure is small, and a flat high friction surface is easily obtained with a small amount of coating. It is shown that. In Comparative Example 8, the friction coefficient was within the range of the present invention, but the tear strength of the base fabric was low, and a burst occurred in the development test.

(Example 10 and Comparative Examples 10 and 11)
The following coatings were applied to the nylon fabrics shown in Examples 2-4.
As for silicone, 1.5 parts of organopolysiloxane ("Crosslinker W" manufactured by Asahi Kasei Wacker Co., Ltd.) having at least three hydrogen atoms bonded with Si to 100 parts (RD6600F) manufactured by Asahi Kasei-Wacker Co., Ltd. (xylene solution). Viscosity of 80,000 mPa · s (composition B) obtained by adding 1.5 parts of an organosilicon compound (“HF86” manufactured by Asahi Kasei-Wacker Co., Ltd.) as an adhesion assistant, and two types of compositions obtained by further xylene dilution, viscosity 40,000 mPa · s (composition C) and a viscosity of 20,000 mPa · s (composition D) were prepared. A linear pressure of 50 kgf / m was applied to the woven fabric by the floating knife method to coat one side with silicone. After coating, the coated fabric was obtained by heat treatment in a dryer at 180 ° C. for 3 minutes. Table 2 shows the conditions of yarns, fabrics, coatings and the results of their property evaluation.

  When the coating liquid of the organic solvent dilution method is highly viscous as in Example 10, the desired effect is shown, but even if the coating liquid viscosity is equal to or higher than that of the solvent-free as in Comparative Examples 10 and 11, The penetration of the coating liquid during coating occurs. The penetration shape of the coating shows that the surface roughness (Ra) is high, but the effect of this penetration is small in the improvement of tearing strength, and in the combustion test, the silicone film cracks during combustion, and there The fire spreads due to the propagation of the flames and fails.

(Comparative Example 12)
The following coatings were applied to the nylon fabrics shown in Examples 2-4. 52 parts of an aqueous silicone emulsion (“DEHENSIVE 38197 VP” manufactured by Asahi Kasei-Wacker Co., Ltd.), 6 parts of organopolysiloxane (“V20” manufactured by Asahi Kasei-Wacker Co., Ltd.) having at least three Si-bonded hydrogen atoms, as an adhesion aid A coating composition (composition) in which 3 parts of an organosilicon compound (“HF86” manufactured by Asahi Kasei-Wacker Co., Ltd.) and 37.5 parts of water are mixed with stirring, with a concentration of 32 wt% and a viscosity at 25 ° C. of 80 mPa · s. E).

  The above coating composition was coated on a woven fabric using a floating knife coater at a linear pressure of 50 kgf / m. After coating, moisture was removed at 130 ° C. for 2 minutes and further crosslinked at 180 ° C. for 1 minute. Table 2 shows the conditions of yarn, woven fabric, and coating and the results of evaluation of the properties.

In the case of an aqueous emulsion, the penetration of the coating solution is significant and the air permeability cannot be made zero. The coating surface also clearly shows the unevenness of the single yarn of the fiber, and the penetration shape of this coating appears in a large surface roughness (Ra) value. The tearing strength does not improve due to the penetration effect of the coating, and in the combustion test, the silicone film cracks during combustion, and it spreads due to the propagation of flames to it and fails.

(Comparative Example 13)
The same nylon fabric as in Examples 2 to 4 was coated with the same silicone composition (Composition A) as in Example 2. At that time, the knife was placed in a roll-on-knife type and coated with a 20 μm gap between the nylon fabric and the knife. Table 2 shows the conditions of yarn, woven fabric, and coating and the results of evaluation of the properties. The coating surface had a very high coefficient of friction, and the coating surface was almost flat by electron microscope observation.

(Example 11 and Comparative Examples 14 to 16)
Table 3 shows the results of the development pressure resistance test using the coating fabrics of Example 2 and Comparative Examples 9, 10, and 12. In Example 11, compared with Comparative Example 16 without coating, an improvement in air bag deployment pressure resistance due to the effect of improving the tearing strength by coating was observed. Further, in Comparative Examples 14 and 15, the coating penetrates into the fiber and there is little or no improvement in tear strength, and it is difficult to obtain improvement in airbag deployment pressure strength.

(Example 12 and Comparative Example 17)
The nylon fabric shown in Example 1 was calendered using a metal paper roll (200 ° C., 80 t / 150 cm, 20 m / min), coated with the coating composition and coating conditions of Example 1, and 3 ° C. at 180 ° C. Heat treated for minutes. Table 4 shows the conditions of yarn, woven fabric, coating, and the results of the property evaluation.

  In Example 12, a low-friction coating surface was obtained with a small amount of coating by previously controlling the surface roughness of the fabric to be low by calendaring. In Comparative Example 17, the fabric was processed with less unevenness, and the coating weight was such that it was filled, and the coating surface was flat and high in friction.

  The coated fabric manufactured by the manufacturing method of the present invention has a low coefficient of friction on the surface of the fabric coating despite having a non-breathable elastomer coating, improved tear strength, and flame retardancy and combustion defined by FMVSS 302 It is a soft and lightweight coating fabric that satisfies speed. Since the airbag for an airbag device obtained by using the coated fabric manufactured by the manufacturing method of the present invention has a short deployment time and excellent deployment uniformity, the airbag has a performance capable of restraining a passenger more quickly. It is a light airbag that can meet the demands of the above and can be stored compactly in the casing of the airbag device, which has excellent deployment pressure resistance.

It is a figure which shows the example of the deployment shape of 14 msec after the deployment start of the airbag which can be expand | deployed uniformly. It is a figure which shows the example of the deployment shape of 19 msec after the deployment start of the airbag which can be expand | deployed uniformly. It is a figure which shows the example of the deployment shape of 14 msec after the deployment start of the airbag developed nonuniformly. It is a figure which shows the deployment shape of 19 msec after the deployment start of the airbag which deploys unevenly. It is a figure which shows the example of the expansion | deployment shape in the complete expansion | deployment (48 msec) of an airbag. It is folding explanatory drawing of the airbag for driver's seats. It is explanatory drawing which shows the measuring method of the folding thickness of the airbag for driver's seats folded by the method shown by FIG. It is a SEM photograph (150 times: 200 micrometers between scale display 10 dots) which shows the cross section of the coating film in the coating fabric (single-sided coating fabric) of Example 2 of this invention perspectively. It is a SEM photograph (90 times: scale display between 10 dots is 500 micrometers) which shows the cross section of the coating film in the coating fabric (single-sided coating fabric) of the comparative example 5 perspectively.

Claims (3)

The weaving fineness expressed by the product of the weaving density and the weaving yarn fineness is 9,000 in both the warp direction and the weft direction, and is composed of a weaving yarn having a total fineness of 67 to 350 dtex composed of a single yarn having a fineness of 0.5 to 4.5 dtex. Apply 1-25 g / m ² of elastomer with a viscosity of 5,000-200,000 mPa · s to a woven fabric of ˜22,000 / dtex / 2.54 cm with a knife coater under contact pressure of 1-500 kgf / m. A method for producing a coated fabric, which is subjected to a crosslinking treatment.   The method for producing a coated fabric according to claim 1, wherein the elastomer is a substantially solvent-free elastomer.   An airbag using the fabric obtained by the manufacturing method according to claim 1.