# US 9,751,486 B2 · Hollow weave fabric for an air bag and method of producing the same

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- Number: US 9,751,486 B2
- Document ID: US9751486B2
- Status: Granted
- Kind: B2
- Application number: 14/245,073
- Filed: 2014-04-04
- Published: 2014-08-07
- Granted: 2017-09-05
- Earliest claimed: 2004-07-16
- Assignees: Asahi Kasei Kabushiki Kaisha
- Applicants: Asahi Kasei Chemicals Corporation
- Inventors: Toshihiro Nagaoka
- Web page: https://patentgrep.com/patent/US9751486B2

## CPC

- B60R 21/16: Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags ({protective garments with automatically inflatable shock-absorbing means A41D13/018; } connection of valves to inflatable elastic bodies B60C29/00)
- B60R 21/235: characterised by their material
- D03D 1/02: Inflatable articles
- D06M 15/643: containing silicon in the main chain
- D06N 3/0002: {characterised by the substrate}
- D06N 3/128: {with silicon polymers}
- B60R 2021/23509: {Fabric}
- B60R 2021/23547: {one piece weaving}
- B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- D03D: WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D06M: TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06N: WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR

## Abstract

A hollow weave fabric for an air bag in which the periphery of a double-layer hollow weave portion is formed with a seam zone, wherein the warp yarn and the weft yarn forming the base fabric are each a poly(hexamethylene adipamide) fiber having a total size of 150 to 500 dtex, the double-layer hollow weave portion has a fabric weight of 120 to 350 g/m2 on one side, and the fabric shows a logarithmic decrement of 0.01 to 0.10.

## Claims

### Claim 1

A method for producing an air bag comprising a hollow weave fabric in which the periphery of a double-layer hollow weave portion is formed with a seam zone, wherein a warp yarn and a weft yarn forming the base fabric are each a poly (hexamethylene adipamide) fiber having a total size of 150 to 500 dtex, the double-layer hollow weave portion has a fabric weight of 120 to 350 g/m2 on one side and a silicone coating layer formed of a silicone composition, the fabric shows a logarithmic decrement of 0.02 to 0.06 at 20° C. after the silicone coating layer is applied, and the air bag is capable of retaining 50% or more of an initial internal pressure 8 seconds after expansion and deployment when the initial internal pressure is a pressure obtained by inflating the air bag using a tank having a capacity of 300 liters and an internal pressure of 900 kPa, the method comprising:
coating the silicone coating layer on both outer sides of the double-layer hollow weave portion, for a coating amount of the silicone composition per outer side of from 35 to 50 g/m2 as a solid component, wherein
the silicone coating layer consists of one coating layer,
on each of the both outer sides of the double-layer portion, the silicone coating layer is the only silicone coating layer coated thereon,
the silicone composition contains an organopolysiloxane with a SiC-bonded vinyl group at a terminal end,
the organopolysiloxane of the silicone coating layer has a viscosity of 5,000 to 150,000 mPa·s at 25° C., and
the silicone coating layer is formed with a floating knife or a roll-on-knife from a dope without a solvent.

### Claim 2

A method for producing an air bag comprising a hollow weave fabric in which the periphery of a double-layer hollow weave portion is formed with a seam zone, wherein a warp yarn and a weft yarn forming the base fabric are each a poly (hexamethylene adipamide) fiber having a total size of 150 to 500 dtex, the double-layer hollow weave portion has a fabric weight of 120 to 350 g/m2 on one side and a silicone coating layer formed of a silicone composition, the fabric shows a logarithmic decrement of 0.02 to 0.06 at 20° C. after the silicone coating layer is applied, and the air bag is capable of retaining 50% or more of an initial internal pressure 8 seconds after expansion and deployment, the method comprising:
coating the silicone coating layer on both outer sides of the double-layer hollow weave portion, for a coating amount of the silicone composition per outer side of from 35 to 50 g/m2 as a solid component, such that the silicone composition permeates into the double-layer hollow weave portion, wherein
the silicone coating layer consists of one coating layer,
on each of the both outer sides of the double-layer portion, the silicone coating layer is the only silicone coating layer coated thereon,
the silicone composition contains an organopolysiloxane with a SiC-bonded vinyl group at a terminal end,
the organopolysiloxane of the silicone coating layer has a viscosity of 5,000 or more and less than 100,000 mPa·s at 25° C., and
the silicone coating layer is formed with a floating knife or a roll-on-knife from a dope without a solvent.