Hollow weave fabric for an air bag and method of producing the same

Patent metadata

Field	Value
Publication number	US-9751486-B2
Application number	US-201414245073-A
Country	US
Kind code	B2
Filing date	Apr 4, 2014
Priority date	Jul 16, 2004
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

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/m 2 on one side, and the fabric shows a logarithmic decrement of 0.01 to 0.10.

First claim

The invention claimed is:

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/m 2 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/m 2 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.

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/m 2 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/m 2 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.

Assignees

• Asahi Kasei Chemicals Corp
• Asahi Chemical Ind

Inventors

• Nagaoka Toshihiro

Classifications

• D06N3/128

  with silicon polymers · CPC title

• B60R21/16 Primary

  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) · CPC title

• B60R2021/23509

  Fabric · CPC title

• D06N3/0002

  characterised by the substrate · CPC title

• B60R2021/23547

  one piece weaving · CPC title