US20130089725A1 - Fabric for air-bag, using polyethylene terephthalate with excellent heat resistance - Google Patents

Fabric for air-bag, using polyethylene terephthalate with excellent heat resistance Download PDF

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Publication number
US20130089725A1
US20130089725A1 US13/704,838 US201113704838A US2013089725A1 US 20130089725 A1 US20130089725 A1 US 20130089725A1 US 201113704838 A US201113704838 A US 201113704838A US 2013089725 A1 US2013089725 A1 US 2013089725A1
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US
United States
Prior art keywords
fabric
airbag
polyethylene terephthalate
terephthalate fiber
manufactured
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US13/704,838
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English (en)
Inventor
Il-Won Jung
Seung-Cheol Yang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hyosung Corp
Original Assignee
Hyosung Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020100060006A external-priority patent/KR101130264B1/ko
Priority claimed from KR1020100060004A external-priority patent/KR101130265B1/ko
Application filed by Hyosung Corp filed Critical Hyosung Corp
Assigned to HYOSUNG CORPORATION reassignment HYOSUNG CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: JUNG, IL-WON, YANG, SEUNG-CHEOL
Publication of US20130089725A1 publication Critical patent/US20130089725A1/en
Abandoned legal-status Critical Current

Links

Classifications

    • DTEXTILES; PAPER
    • D01NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01DMECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00Formation of filaments, threads, or the like
    • D01D5/08Melt spinning methods
    • DTEXTILES; PAPER
    • D01NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01FCHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/58Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
    • D01F6/62Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyesters
    • DTEXTILES; PAPER
    • D03WEAVING
    • D03DWOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D1/00Woven fabrics designed to make specified articles
    • D03D1/02Inflatable articles
    • DTEXTILES; PAPER
    • D03WEAVING
    • D03DWOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/50Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads
    • D03D15/513Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads heat-resistant or fireproof
    • DTEXTILES; PAPER
    • D10INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10BINDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2331/00Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
    • D10B2331/04Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyesters, e.g. polyethylene terephthalate [PET]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/249921Web or sheet containing structurally defined element or component

Definitions

  • the present invention relates to a fabric for an airbag using a polyethylene terephthalate fiber, and particularly, to a fabric for an airbag having enhanced thermal resistance and instantaneous thermal strain rate, which is manufactured using a polyethylene terephthalate fiber for an airbag manufactured by controlling the strength and elongation of the polyethylene terephthalate fiber to replace a conventional fabric for an airbag using a yarn formed of nylon 66.
  • An airbag requires characteristics of low air permeability to easily rupture in a car crash, and energy absorbability to prevent damage to and bursting of the airbag itself. In addition, to be more easily stored, characteristics relating to foldability of a fabric itself are required.
  • nylon 66 has generally been used. However, recently, in order to save on cost, attention on fibers other than nylon 66 has been increasing.
  • polyethylene terephthalate As a fiber capable of being used for an airbag, polyethylene terephthalate may be used. However, when polyethylene terephthalate is used as a yarn for an airbag, seams rupture during airbag cushion module tests. To solve this problem, it is important to use a polyethylene terephthalate yarn that does not degrade the energy absorbability of an airbag. In addition, it is necessary to improve flexibility of the fabric for an airbag using a polyethylene terephthalate fiber to be easily stored.
  • the present invention is directed to providing a fabric for an airbag using polyethylene terephthalate, which has excellent energy absorbability resulting in fewer ruptures of outer seams during an airbag cushion development tests, and is more easily stored.
  • a fabric for an airbag including a polyethylene terephthalate fiber manufactured by spinning a polyethylene terephthalate chip having an intrinsic viscosity of 0.8 to 1.3 dl/g is provided.
  • the fabric for an airbag has a thermal resistance of 0.45 to 0.65 seconds at 350° C., which is calculated by the following Equation.
  • T 1 is the time in which a steel rod heated to 350° C. falls from 10 cm above the fabric through the fabric
  • T 2 is the time in which the same steel rod falls from the same height.
  • a fabric for an airbag including a polyethylene terephthalate fiber manufactured by spinning a polyethylene terephthalate chip having an intrinsic viscosity of 0.8 to 1.3 dl/g is provided.
  • the fabric for an airbag has a thermal resistance of 0.75 to 1.0 seconds at 450° C., which is calculated by the following Equation, and an instantaneous thermal strain rate of 1.0 to 5.0%.
  • T 3 is the time that a steel rod heated to 450° C. falls from 10 cm above the fabric through the fabric
  • T 4 is the time that the same steel rod falls from the same height.
  • the fabric for an airbag has a stiffness of 5.0 to 15.0 N.
  • the polyethylene terephthalate fiber has a strength of 8.0 to 11.0 g/d, and an elongation of 15 to 30% at room temperature.
  • the polyethylene terephthalate fiber has an instantaneous thermal strain rate of 1.0 to 5.0%, and a filament size of 4.5 deniers or less.
  • the present invention provides a polyethylene terephthalate fabric for an airbag, which overcomes the lack of flexibility, which is a disadvantage of a conventional fabric for an airbag, and has better thermal resistance.
  • an airbag module manufactured using the fabric for an airbag can be more easily stored and rarely bursts due to pressure and heat instantaneously applied by a high temperature expanding gas during airbag development tests.
  • the present invention provides a polyethylene terephthalate fabric for an airbag manufactured by manufacturing a polyethylene terephthalate fiber for an airbag by controlling the strength and elongation of the polyethylene terephthalate fiber, thereby obtaining excellent thermal resistance and instantaneous thermal strain rate. Accordingly, outer seams rupture less frequently during airbag cushion development tests, and the foldability and storability of the fabric for an airbag are improved.
  • the fabric for an airbag uses a polyethylene terephthalate multifilament obtained by spinning a polyethylene terephthalate chip having an intrinsic viscosity (IV) of 0.8 to 1.3 dl/g to safely absorb instantaneous impact energy of an exhausted gas generated due to explosion of gunpowder in the airbag.
  • a polyester yarn having an intrinsic viscosity (IV) of less than 0.8 dl/g is not suitable because the polyester yarn does not have sufficient toughness to be used as an airbag.
  • a resin for producing a synthetic fiber multifilament for an airbag may be selected from the group consisting of polymers such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene-1,2-bis(phenoxy)ethane-4,4′-dicarboxylate, and poly(1,4-cyclohexylene-dimethylene terephthalate); copolymers including at least one of the polymers as a repeated unit, such as polyethylene terephthalate/isophthalate copolyester, polybutylene terephthalate/naphthalate copolyester, and polybutylene terephthalate/decane dicarboxylate copolyester; and a mixture of at least two of the polymers and copolymers.
  • a polyethylene terephthalate resin is most preferably used in terms of mechanical properties and the formation of a fiber.
  • the polyethylene terephthalate fiber for an airbag of the present invention may have a strength of 8.0 to 11.0 g/d and an elongation of 15 to 30% at room temperature.
  • a strength of the polyethylene terephthalate fiber for an airbag of the present invention is less than 8.0 g/d, the polyethylene terephthalate fiber is not suitable for the present invention because of low tensile and tearing strengths of the manufactured fabric for an airbag.
  • the polyethylene terephthalate fiber for an airbag of the present invention may have a filament size of 4.5 deniers or less, and preferably 3 deniers or less.
  • a filament size of 4.5 deniers or less, and preferably 3 deniers or less.
  • the obtained fabric becomes flexible, thereby achieving excellent foldability and better storability.
  • the filament size is smaller, covering properties are enhanced at the same time. As a result, air permeability of the fabric may be inhibited.
  • the filament size is more than 4.5 deniers, the fabric has degraded foldability and storability, and low air permeability, and thus the fabric cannot properly serve as a fabric for an airbag.
  • the polyethylene terephthalate fiber for an airbag of the present invention may have an instantaneous thermal strain rate of 0.1 to 5.0%, and preferably 2.0 to 4.0% at 100° C.
  • the instantaneous thermal strain rate of the fiber is less than 1.0%, the absorbability of energy applied when the airbag cushion is expanded due to a high temperature gas is degraded, and thus the airbag cushion bursts easily.
  • the instantaneous thermal strain rate of the fiber is more than 5.0%, a length of the fiber is increased at high temperature, and thus seams of the airbag cushion rupture when it is expanded due to a high temperature gas. Therefore, an uncontrolled expanding gas is leaked.
  • stiffness may be approximately 5.0 to 15.0 N, and preferably 6.0 to 9.0 N when evaluated by circular bend measurement. When the stiffness is more than 15.0 N, the fabric becomes stiff, and thus is difficult to store in the manufacture of the airbag module and degraded in developing performance of the airbag cushion.
  • thermal resistance measured using a rod heated at 350° C. in a hot rod test may be 0.75 to 1.0 seconds.
  • the thermal resistance measured at 350° C. is less than 0.75 seconds, the thermal resistance of the fabric for an airbag is too low to withstand a high temperature gas in the development of the airbag cushion, and thus outer seams of the airbag easily rupture.
  • the thermal resistance measured at 350° C. is more than 1.0 second, since a polyethylene terephthalate yarn having a larger filament size is necessarily used, the stiffness of the fabric is increased, and thus the fabric for an airbag is difficult to store in the module.
  • thermal resistance measured using a steel rod heated to 450° C. in a hot rod test may be 0.45 to 0.65 seconds.
  • the thermal resistance measured at 450° C. is less than 0.45 seconds, the thermal resistance of the fabric for an airbag is too low to withstand a high temperature gas in the development of the airbag cushion, and thus outer seams of the airbag easily rupture.
  • the thermal resistance measured at 450° C. is more than 0.65 seconds, since a polyethylene terephthalate yarn having a larger filament size is necessarily used, the stiffness of the fabric is increased, and thus the fabric for an airbag is difficult to store in the module.
  • the fabric may be woven with the polyethylene terephthalate fiber as a plain fabric having a symmetrical structure.
  • the fabric may be woven as a 2/2 panama fabric having a symmetrical structure using a yarn having a smaller linear density.
  • the woven fabric may be coated with a coating agent selected of silicon-, polyurethane-, acryl-, neoprene-, and chloroprene-based coating agents at a weight of 15 to 60 g/m 2 to secure low air permeability, which is suitable for the fabric for an airbag.
  • a coating agent selected of silicon-, polyurethane-, acryl-, neoprene-, and chloroprene-based coating agents at a weight of 15 to 60 g/m 2 to secure low air permeability, which is suitable for the fabric for an airbag.
  • 0.1 g of a sample was dissolved in a reagent prepared by mixing phenol and 1,1,2,2-tetrachloroethanol in a weight ratio of 6:4 (90° C.) for 90 minutes.
  • the resulting solution was transferred to an Ubbelohde viscometer and maintained in a constant temperature oven at 30° C. for 10 minutes, and a drop time of the solution was measured using a viscometer and an aspirator.
  • a drop time of a solvent was also measured as described above, and then R.V. and I.V. values were calculated by the following equations.
  • I.V. 1/4 ⁇ [( R.V. ⁇ 1)/ C]+ 3/4 ⁇ (In R.V./C )
  • C is the concentration (g/100 ml) of the sample in the solution.
  • a bundle of filaments having a thickness of approximately 59 deniers was made by randomly selecting filaments from a multi filament yarn.
  • the bundle of filaments was mounted on a TA instrument (model name: TMS Q-400) to have a length of 10 mm, and then a stress of 1.0 gf/den was applied thereto. 2 minutes after the application of a stress, a test started and a temperature was rapidly increased from 30 to 100° C. for 30 minutes. An instantaneous thermal strain rate was obtained by dividing a length increment of the sample when the temperature approached 100° C. by an initial length of the sample, and is shown as a percentage.
  • the stiffness of a fabric was measured by circular bend measurement according to the specification of ASTM D4032. Here, the stiffness was measured with respect to weft and warp directions, and an average of the values obtained in the weft and warp directions is shown in units of Newtons (N).
  • a cylindrical steel rod having a weight of 50 g and a diameter of 10 mm was heated to 350° C. and then dropped vertically from 10 cm above a fabric for an airbag.
  • T 1 the time in which the heated rod fell through the fabric
  • T 2 the time in which the rod fell without the fabric
  • the thermal resistance was measured by the following equation.
  • one layer of the unfolded fabric for an airbag was used.
  • a cylindrical steel rod having a weight of 50 g and a diameter of 10 mm was heated to 450° C. and then dropped vertically from 10 cm above a fabric for an airbag.
  • the time in which the heated rod fell through the fabric was T 3
  • the time in which the rod fell without the fabric was T 4 .
  • the thermal resistance was measured by the following equation.
  • one layer of the unfolded fabric for an airbag was used.
  • a yarn sample was left in a constant temperature and constant humidity chamber under standard conditions, that is, a temperature of 25° C. and a relative humidity of 65% for 24 hours, and tested by a method of ASTM 2256 using a tension tester.
  • a plain fabric was woven with a filament yarn to have a yarn density of 50 wefts or warps per inch in both of weft and warp directions.
  • a raw fabric was scoured and contracted in aqueous baths which were gradually set from 50 to 95° C. using a continuous scouring machine, and then treated at 200° C. for 2 minutes by thermomechanical treatment. Afterward, the fabric was coated with a silicon-based coating agent at a weight of 25 g/m 2 .
  • a driver airbag (DAB) module was manufactured with a coated fabric for an airbag, and subjected to a static test within several minutes after being left at 85° C. for 4 hours.
  • a pressure of a powder inflator was 180 kPa, and when the tearing of the fabric, forming of a pin hole and burning of the fabric were not shown after the development test, it was evaluated as “Pass.” However, when any one of the tearing of the fabric, forming of a pin hole in a seam and burning of the fabric was shown, it was evaluated as “Fail.”
  • a raw fabric for an airbag was manufactured with a polyethylene terephthalate yarn having the characteristics listed in Table 1 by plain-weaving using a rapier loom to have a fabric density of 50 wefts or warps per inch in both of weft and warp directions.
  • a raw fabric for an airbag was manufactured with a polyethylene terephthalate yarn having the characteristics listed in Table 1 by the method as described in Example 1.
  • a raw fabric for an airbag was manufactured with a polyethylene terephthalate yarn having the characteristics listed in Table 1 by the method as described in Example 1.
  • a raw fabric for an airbag was manufactured with a nylon 66 yarn having the characteristics listed in Table 1 by plain-weaving using a rapier loom to have a fabric density of 50 wefts or warps per inch in both of weft and warp directions.
  • a raw fabric for an airbag was manufactured with a polyethylene terephthalate yarn having the characteristics listed in Table 1 by the method as described in Comparative Example 1.
  • a raw fabric for an airbag was manufactured with a polyethylene terephthalate yarn having the characteristics listed in Table 1 by the method as described in Comparative Example 1.
  • Example 2 The raw fabric manufactured in Example 1 was scoured and contracted in aqueous baths gradually set from 50 to 95° C. using a continuous scouring machine, and then treated at 200° C. for 2 minutes by thermomechanical treatment. In an uncoated state, the fabric was measured in stiffness, thermal resistance at 350° C. and thermal resistance at 450° C., the results of which are shown in Table 2.
  • the manufactured fabric was coated with a silicon-based coating agent at a weight of 25 g/m 2 , and thermally treated at 180° C. for 2 minutes.
  • An airbag cushion was made with the thermally-treated fabric, and subjected to a development test for the airbag cushion. The test results and storability in a module are shown in Table 2.
  • Example 2 The raw fabric manufactured in Example 2 was treated by the method described in Example 4. Physical properties, results of an airbag cushion development test and storability in a module of the manufactured fabric are shown in Table 2.
  • Example 3 The raw fabric manufactured in Example 3 was treated by the method described in Example 4. Physical properties, results of an airbag cushion development test and storability in a module of the manufactured fabric are shown in Table 2.
  • the raw fabric manufactured in Comparative Example 1 was scoured and contracted in aqueous baths gradually set from 50 to 95° C. using a continuous scouring machine, and then treated at 200° C. for 2 minutes by thermomechanical treatment. In an uncoated state, the fabric was measured in stiffness, thermal resistance at 350° C. and thermal resistance at 450° C., the results of which are shown in Table 2.
  • the manufactured fabric was coated with a silicon-based coating agent at a weight of 25 g/m 2 , and thermally treated at 180° C. for 2 minutes.
  • An airbag cushion was made with the thermally-treated fabric, and subjected to a development test for the airbag cushion. The test results and storability in a module are shown in Table 2.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Woven Fabrics (AREA)
  • Air Bags (AREA)
  • Artificial Filaments (AREA)
US13/704,838 2010-06-24 2011-05-27 Fabric for air-bag, using polyethylene terephthalate with excellent heat resistance Abandoned US20130089725A1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
KR10-2010-0060004 2010-06-24
KR1020100060006A KR101130264B1 (ko) 2010-06-24 2010-06-24 열저항성이 우수한 폴리에틸렌테레프탈레이트 섬유를 이용한 에어백용 직물
KR1020100060004A KR101130265B1 (ko) 2010-06-24 2010-06-24 폴리에틸렌테레프탈레이트 섬유를 이용한 에어백용 직물
KR10-2010-0060006 2010-06-24
PCT/KR2011/003890 WO2011162486A2 (ko) 2010-06-24 2011-05-27 열저항성이 우수한 폴리에틸렌테레프탈레이트 섬유를 이용한 에어백용 직물

Publications (1)

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US20130089725A1 true US20130089725A1 (en) 2013-04-11

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US13/704,838 Abandoned US20130089725A1 (en) 2010-06-24 2011-05-27 Fabric for air-bag, using polyethylene terephthalate with excellent heat resistance

Country Status (9)

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US (1) US20130089725A1 (es)
JP (1) JP2013528719A (es)
CN (1) CN102959147B (es)
CA (1) CA2801482C (es)
DE (1) DE112011102093B4 (es)
GB (1) GB2495645A (es)
MX (1) MX2012014677A (es)
RO (1) RO131566B1 (es)
WO (1) WO2011162486A2 (es)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120263401A1 (en) * 2009-12-24 2012-10-18 Hyosung Corporation Polyethylene terephthalate fiber for air-bags and textiles made from same
US20190084519A1 (en) * 2016-04-05 2019-03-21 Felter of South Carolina, LLC Vehicle safety devices, seam tapes for use in airbag and related methods
EP3690093A4 (en) * 2017-09-29 2021-07-07 Seiren Co., Ltd. BASE FABRIC FOR AN UNCOATED AIRBAG AND AIRBAG
US11390241B2 (en) 2017-09-28 2022-07-19 Seiren Co., Ltd. Non-coated airbag fabric and airbag
US11414042B2 (en) 2017-09-29 2022-08-16 Seiren Co., Ltd. Non-coated air bag fabric and air bag

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EP2597180A1 (en) * 2011-11-24 2013-05-29 Autoliv Development AB Improvements relating to air-bag fabrics
JPWO2023037982A1 (es) 2021-09-09 2023-03-16

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US5637385A (en) * 1994-02-07 1997-06-10 Toray Industries, Inc. High-strength ultra-fine fiber construction, method for producing the same and high-strength conjugate fiber
US20010029140A1 (en) * 2000-03-09 2001-10-11 Toray Industires, Inc. Seat belt webbing and passenger-holding device using the same
US7144614B2 (en) * 2001-02-23 2006-12-05 Toyo Boseki Kabushiki Kaisha Polyester polymerization catalyst, polyester produced by using the same, and process for producing polyester
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120263401A1 (en) * 2009-12-24 2012-10-18 Hyosung Corporation Polyethylene terephthalate fiber for air-bags and textiles made from same
US20190084519A1 (en) * 2016-04-05 2019-03-21 Felter of South Carolina, LLC Vehicle safety devices, seam tapes for use in airbag and related methods
US11001222B2 (en) * 2016-04-05 2021-05-11 Felters Of South Carolina, Llc Vehicle safety devices, seam tapes for use in airbag and related methods
US11390241B2 (en) 2017-09-28 2022-07-19 Seiren Co., Ltd. Non-coated airbag fabric and airbag
EP3690093A4 (en) * 2017-09-29 2021-07-07 Seiren Co., Ltd. BASE FABRIC FOR AN UNCOATED AIRBAG AND AIRBAG
US11414042B2 (en) 2017-09-29 2022-08-16 Seiren Co., Ltd. Non-coated air bag fabric and air bag
US11752969B2 (en) 2017-09-29 2023-09-12 Seiren Co., Ltd. Non-coated air bag base cloth and air bag

Also Published As

Publication number Publication date
CA2801482C (en) 2015-05-19
DE112011102093T5 (de) 2013-08-08
RO131566B1 (ro) 2020-03-30
RO131566A2 (ro) 2016-12-30
WO2011162486A3 (ko) 2012-05-03
MX2012014677A (es) 2013-02-11
CN102959147B (zh) 2014-06-11
WO2011162486A2 (ko) 2011-12-29
GB2495645A (en) 2013-04-17
DE112011102093B4 (de) 2019-06-19
JP2013528719A (ja) 2013-07-11
CA2801482A1 (en) 2011-12-29
CN102959147A (zh) 2013-03-06

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