Laminated battery separator material
AssigneeAhlstrom Mount Holly Springs, LLC
InventorsLarry L. Kinn, Clement J. Haley, Gregory N. Henning
Life of this patent
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Abstract
A nonwoven material having a laminated construction and including a first layer of nonwoven fibers defining a first surface of the material; a second layer of nonwoven fibers defining the opposite surface of the material; and a third layer of nonwoven fibers located between the first and second layers. The layers are bonded together to form a laminate. At least one of the nonwoven layers comprises a nonwoven web of meltblown fibers. Additionally, one or more of the layers has been rendered permanently hydrophilic by forming the nonwoven web from meltspun fibers of a normally hydrophobic polymer having a hydrophilic melt additive incorporated therein.
Claims19
A laminate nonwoven material comprising:
- a first layer formed of meltblown nonwoven fibers defining a first surface of the laminate;
- a second layer formed of meltblown nonwoven fibers defining the opposite surface of the laminate;
- and
- an intermediate third layer of wetlaid nonwoven fibers located between said first and second layers, the layers and bonded to said first and second layers to form a laminate, said third layer produced from a blend of hydrophobic and hydrophilic fibers;
- at least one of said first and third layers comprising permanently hydrophilic fibers formed of a normally hydrophobic polypropylene polymer having a hydrophilic melt additive which are melt blended therein, so as to produce a web that is able to maintain its ability to stay wet after two three-hour exposures intervals at 31% KOH at 60 degree C.
A laminate nonwoven material comprising:
- a first layer formed of meltblown nonwoven fibers defining a first surface of the laminate;
- a second layer formed of spunbond nonwoven fibers defining the opposite surface of the laminate;
- and
- an intermediate third layer of wetlaid nonwoven fibers located between said first and second layers, the layers and bonded to said first and second layers to form a laminate, said third layer produced from a blend of hydrophobic and hydrophilic fibers;
- at least one of said first and third layers comprising permanently hydrophilic fibers formed of a normally hydrophobic polypropylene polymer having a hydrophilic melt additive which are melt blended therein, so as to produce a web that is able to maintain its ability to stay wet after two three-hour exposures intervals at 31% KOH at 60 degree C.;
- and
- at least one of said first and second layers contains acrylic acid grafted polypropylene.
Dependencies are inferred from the claim text.