Low permeability airbag cushions having extremely low...

B - Operations – Transporting – 60 – R

Patent

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Details

B60R 21/16 (2006.01) B32B 5/02 (2006.01) B32B 17/02 (2006.01) B32B 27/12 (2006.01) B32B 27/30 (2006.01) D06N 3/18 (2006.01)

Patent

CA 2340903

Coated inflatable fabrics (26), more particularly airbags to which very low add-on amounts of coating have been applied, are provided which exhibit extremely low air permeabilities. The inventive fabrics are primarily for use in automotive restraint cushions which require low permeability characteristics (such as side curtain airbags). Traditionally, heavy, and thus expensive, coatings of compounds such as neoprene, silicones and the like, have been utilized to provide such required low permeability levels. Thus, the inventive coated airbag possesses a coating of at most 2.5 ounces per square yard, most preferably about 0.8 ounces per square yard, and exhibits a leak- down time (a meaurement of the time required for the entire amount of gas introduced within the airbag at peak pressure during inflation to escape the airbag at 10 psi) of at least 7 seconds. All coatings, in particular elastomeric, non-silicon coatings, and coated airbags, meeting these criteria are intended to reside within the scope of this invention.

L'invention concerne des tissus gonflables revêtus (26), notamment des airbags sur lesquels des faibles quantités additionnelles de revêtement ont été appliquées, et présentant des perméabilités à l'air extrêmement faibles. Les tissus de l'invention sont principalement destinés à être utilisés dans des coussins de sécurité d'automobile nécessitant des caractéristiques de perméabilité faibles (tels que des airbag latéraux). Habituellement, des couches lourdes et onéreuses de composés, tels que le néoprène, les silicones et similaires, sont utilisées pour que les faibles niveaux de perméabilité requis soient atteints. Ainsi, l'airbag revêtu de l'invention possède un revêtement d'au plus 2,5 onces par yard carré, et idéalement d'environ 0,8 once par yard carré, et présente un temps d'échappement (mesure du temps requis pour que la quantité de gaz introduite dans l'airbag à une pression de pointe pendant le gonflement s'échappe de l'airbag à 10 psi) d'au moins 7 secondes. L'invention concerne tous les revêtements, notamment les revêtements élastomères, non siliconés, et les airbags remplissant ces conditions.

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