Edgecomb resistance polyester
View Patent ↗The present invention concerns polyester fabric that is employed in airbags. In particular, the polyester fabric has improved resistance to edge combing—the relative tendency of a fabric to pull apart under seam stress or similar action such as inflation of inflatable restraints. Further, the polyester fabric of the invention must have an edge comb resistance of greater than about 350 Newtons at room temperature (20° C.) and greater than 250 Newtons at 90° C. The polyester fabric of the invention has an acrylic polymer or copolymer finish, or a mixture of acrylic and non-acrylic polymers. The finish is applied from about 1 to about 4 wt. % nominal solids add-on of said fabric.
1. A woven polyester fabric having from about 1 to about 4 wt. % nominal solids add-on of an acrylic based finish thereon, said fabric having an edge comb resistance greater than 350 Newtons at room temperature and greater than 250 Newtons at 90° C.; wherein said fabric is further characterized by:
i) said finish coating the polyester fibers from which said fabric is woven without forming a film on said fabric itself; and
ii) having an air permeability not substantially changed from an identical fabric not treated with said finish.
2. The woven polyester fabric of claim 1 , wherein said finish is from about 1 to about 2 wt % nominal solids add-on of said fabric.
3. A woven polyester fabric having an acrylic acid ester polymer finish thereon, said fabric having an edge comb resistance greater than 350 Newtons at room temperature and greater than 250 Newtons at 90° C.; wherein said fabric is further characterized by:
i) said finish coating the polyester fibers from which said fabric is woven without forming a film on said fabric itself; and
ii) having an air permeability not substantially changed from an identical fabric not treated with said finish.
4. The woven polyester fabric of claim 3 , wherein said acrylic acid ester polymer is prepared from monomers including methyl, ethyl, n-butyl, iso-butyl, 2-ethylhexyl, and octyl acrylic acids and mixtures thereof.
5. The woven polyester fabric of claim 3 , wherein said polymer is a copolymer of an acrylic acid ester and another polymerizable monomer.
6. The woven polyester fabric of claim 5 , wherein said polymerizable monomer is selected from methacrylates, styrene, vinyl acetate, and acrylonitrile.
7. The woven polyester fabric of claim 1 , wherein said fabric is a plain weave having about 42×42 yarns per inch (16.5×16.5 yarns per cm.).
8. The woven polyester fabric of claim 3 wherein said fabric is coated with an elastomer.
9. A polyester airbag having an edge comb resistance greater than 350 Newtons at 20° C. and greater than 250 Newtons at 90° C., said airbag comprising a fabric having an acrylic acid ester polymer finish; wherein said fabric is further characterized by:
i) said finish coating the polyester fibers from which said fabric is woven without forming a film on said fabric itself; and
ii) having an air permeability not substantially changed from an identical fabric not treated with said finish.
10. The polyester airbag of claim 9 , wherein said acrylic acid ester polymer is prepared from monomers including methyl, ethyl, n-butyl, iso-butyl, 2-ethylhexyl, and octyl acrylic acids and mixtures thereof.
11. The polyester airbag of claim 9 , wherein said polymer is a copolymer of an acrylic acid ester and another polymerizable monomer.
12. The polyester airbag of claim 11 , wherein said polymerizable monomer is selected from methacrylates, styrene, vinyl acetate, and acrylonitrile.
13. The polyester airbag of claim 9 , wherein said finish is from about 1 to about 4 wt. % nominal solids add-on of said airbag.