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US 7,465,685 B2Granted
Heatsealable filter material
AssigneeGlatfelter Gernsbach GmbH
InventorsYves Le Brech, Günter Heinrich, Manfred Kauβen, Stefan Kuntz, Danny Meger
Life of this patent
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Abstract
A filter material comprising at least one nonheatsealable ply and at least one heatsealable ply which comprises fibers of synthetic material and contains an adhesion promoter, and also processes for producing same.
Claims7
A filter material comprising:
- at least one nonheatsealable ply comprising natural fibers and having a DIN ISO 9237 air permeability from about 300 to about 4,000 l/m2.s;
- and
- at least one heatsealable ply consisting of natural fibers and synthetic fibers, wherein each of said synthetic fibers consists of a fiber blend of a synthetic material and an adhesion promoter, wherein said adhesion promoter of said fiber blend consists of polypropylene grafted with functional maleic anhydride groups.
Dependencies are inferred from the claim text.