The present invention relates to a bipolar ion exchange membrane and a production method therefor, and provides a bipolar ion exchange membrane comprising a first polar heterogeneous ion exchange membrane and a second polar homogeneous ion exchange membrane stacked on each other, wherein the first polar heterogeneous ion exchange membrane is formed of an ion exchange resin powder and a binder resin that contain a first polar ion exchange group, the second polar homogeneous ion exchange membrane is formed of a matrix resin containing a second polar ion exchange group, and an interface between the first polar heterogeneous ion exchange membrane and the second polar homogeneous ion exchange membrane is a heterogeneous interface.

In at least one embodiment, a microporous membrane having a moderate to high water vapor permeability and high liquid water penetration resistance is disclosed. The microporous membrane may be used in building applications, including as or as part of a building wrap, a rain screen, a roofing underlayment, a flashing, a sound proofing material, or an insulation material. The microporous membrane may include at least one thermoplastic polymer, at least one filler, and at least one processing oil. The microporous membrane may be flat or may have ribs. The microporous membrane may include at least one scrim component. A method for forming the microporous membrane is also disclosed.

A crosslinked polyolefin separator and a method of making the same are disclosed herein. In some embodiments, a crosslinked polyolefin separator includes inorganic particles and a crosslinked polyolefin having Si—O—Si crosslinking bonds, wherein the inorganic particles are chemically bound to silicon (Si) atoms of the Si—O—Si crosslinking bonds by oxygen (O) atoms. The crosslinked polyolefin separator has low resistance, high air permeability and improved heat resistance.

In accordance with at least selected embodiments, a battery separator or separator membrane comprises one or more co-extruded multi-microlayer membranes optionally laminated or adhered to another polymer membrane. The separators described herein may provide improved strength, for example, improved puncture strength, particularly at a certain thickness, and may exhibit improved shutdown and/or a reduced propensity to split.

Disclosed herein is an improved membrane, separator and/or method for forming a multilayer microporous membrane for use in an improved battery separator, particularly a battery separator for a lithium ion secondary battery. Also disclosed herein is the multilayer microporous membrane formed by this method, which has properties that compete with or exceed those of wet process, coated or uncoated, membranes that are also useable in battery separators. Also disclosed are battery separators comprising the multilayer microporous membrane and batteries, vehicles, or devices comprising the separators. The method may comprise at least the following steps: (1) forming a stretched first non-porous precursor film that has pores due to the stretching of a first non-porous precursor film; (2) separately forming a second stretched non-porous precursor film that has pores due to the stretching of a second non-porous precursor film; and then (3) laminating the stretched first non-porous precursor and the stretched second non-porous precursor.

A metal-organic framework material separation membrane and a preparation method for the metal-organic framework material separation membrane are provided. The metal-organic framework material separation membrane has a base membrane and a metal-organic framework material functional layer. The metal-organic framework material functional layer comprises has an inter-embedded polyhedron structure. The preparation metal-organic framework material separation membrane includes the steps of: (1) preparing a solution containing a first organic solvent, an organic ligand, a metal compound, and an auxiliary agent; (2) subjecting a base membrane to a pretreatment, involving introducing, on the surface of the base membrane, metal atoms from the metal compound of step (1); and (3) mixing the pretreated base membrane of step (2) with the solution of step (1) to obtain a first mixture, and then heating the first mixture for reaction, so as to prepare a metal-organic framework material separation membrane.

A polyolefin composite porous membrane includes a first layer and a second layer. The first layer contains a polypropylene (A), a first high-density polyethylene (B) having a melting point of 130 C. or higher, and a second high-density polyethylene (C) having a melting point of 120 C. or higher and lower than 130 C. The second layer contains a polyethylene (D). The first layer and the second layer are integrally laminated with each other.

This application relates to a separator for a rechargeable battery. The separator includes a porous substrate and a coating layer on at least one surface of the porous substrate. The coating layer includes a binder including a fluorine-based binder and a (meth)acryl-based binder, and a filler. The fluorine-based binder includes a first structural unit derived from vinylidene fluoride and a second structural unit derived from at least one monomer of hexafluoropropylene, chlorotrifluoroethylene, trifluoroethylene, ethylene tetrafluoride, and ethylene monomers, and the second structural unit is included in an amount of 10 wt % or less with respect to the fluorine-based binder. The fluorine-based binder includes a first fluorine-based binder having a weight average molecular weight of 800,000 to 1,500,000 and a second fluorine-based binder having a weight average molecular weight of less than or equal to 600,000. The (meth)acryl-based binder has pencil hardness of 5H or higher.

In accordance with at least selected embodiments, a battery separator or separator membrane comprises one or more co-extruded multi-microlayer membranes optionally laminated or adhered to another polymer membrane. The separators described herein may provide improved strength, for example, improved puncture strength, particularly at a certain thickness, and may exhibit improved shutdown and/or a reduced propensity to split.

A method for treating a surface of a microporous membrane includes: (1) contacting at least one surface of the membrane with a treatment composition including: (a) an acrylic polymer prepared from a mixture of vinyl monomers including: (i) a (meth)acrylic acid monomer and (ii) a silane-functional acrylic monomer; and (b) a base, where the acrylic polymer is in contact with the filler present in the matrix; and (2) subjecting the membrane of (1) to conditions sufficient to effect a condensation reaction between the filler and the acrylic polymer. A treated microporous membrane and an aqueous treatment composition are also disclosed.