Membrane with reacted networks
AssigneeCelgard, LLC
InventorsWenbin Yin, Stefan Reinatz
Life of this patent
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Abstract
Disclosed is a membrane with one or more dry-process porous layers that comprise (1) a polyolefin and (2) a product formed by reacting two components, which may be a compound with one or more carboxy groups and a compound with one or more epoxy groups. The product may be a reaction network, a three-dimensional reaction network, or a cross-linked network The resulting membrane has improved strength, reduced splittiness, or both improved strength and reduced splittiness. The membrane may be used in a battery, capacitor, HVAC, filtering device, or textile. Methods for making the membrane are also disclosed.
Claims20
A membrane comprising at least one dry-process porous layer that comprises the following:
- a polyolefin;
- and
- a product formed by reacting a compound with one or more carboxy groups and a compound with one or more epoxy groups, wherein the product may be a reaction network, a three-dimensional reaction network, or a cross-linked network.
A method for forming a dry-process porous layer, comprising:
- extruding or casting a composition comprising a polyolefin, a compound having one or more epoxy groups, an a compound having one or more carboxy groups to form a non-porous precursor;
- stretching the non-porous precursor to form pores;
- and applying at least enough heat to cause the compound having one or more epoxy groups to react with the compound having one or more carboxy groups to form a product, wherein heat may be applied before stretching, after stretching, during stretching, or any combination thereof, and wherein the product may be a reaction network, a three-dimensional reaction network, or a cross-linked network.
A method comprising:
- applying a solution that comprises a compound having one or more carboxy groups, a compound having one or more epoxy groups, and a solvent to a dry-process porous polyolefin film to form an impregnated dry-process porous polyolefin film;
- and then
- applying at least enough heat to the impregnated dry-process porous polyolefin film to cause the compound having one or more epoxy groups to react with the compound having one or more carboxy groups to form a product, wherein the product may be a reaction network, a three-dimensional reaction network, or a cross-linked network.
Dependencies are inferred from the claim text.