Airbag coatings comprising microspheres providing improved thermal resistance
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United States of America Patent
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Jun 10, 2003
Grant Date -
May 23, 2002
app pub date -
Nov 10, 1999
filing date -
Nov 10, 1999
priority date (Note) -
Expired
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Abstract
This invention relates to novel airbag coating compositions and systems comprising pre-expanded or non-expandable microspheres that provide effective insulation for the target airbag fabric during exothermic inflation. The inventive airbag fabrics are either pre-calendered prior to application of this composition or are coated through a gap (floating) knife method with such heat-expandable microsphere-containing compositions. The coated airbag fabrics and cushions may then be heated to evaporate the solvent within the coating composition. The resultant fabric thus exhibits the presence of the microsphere constituents of the coating compositions both within the interstices between the individual yarns of the fabric and over the raised yarns of the fabric. Such a coating system thus provides an extremely high degree of protection from heat exposure that permits structural integrity of the target airbag cushion airbag and provides protection from such high inflation temperatures to a vehicle passenger cushion during such a highly exothermic inflation event. The method of forming such specific airbag coating systems on airbag fabrics is also encompassed within this invention.
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