Copolymer membranes, fibers, products and methods
In accordance with at least selected embodiments, the present invention is directed to novel, improved, or modified porous membranes, fibers, porous fibers, products made from such membranes, fibers or porous fibers, and/or related methods of production, use, and/or the like. In accordance with at least certain embodiments, the present invention is directed to novel, improved, or modified microporous membranes or films, fibers, microporous fibers, materials or layers made from such membranes, fibers or porous fibers, and the like for use in textile materials, garments, products, and/or textile related applications. Microporous membranes, fibers, and/or microporous fibers are made of one or more copolymers, such as block or impact copolymers, or of at least one polyolefin combined with at least one copolymer as a means of improving the hand, drape, and/or surface coefficient of friction performance properties for use in textile garments, textile materials or textile related applications.
1. A battery separator comprising at least one microporous polyolefin membrane includes: at least one of: a block or impact copolymer comprising or consisting of two or more polyolefins, and a polyolefin in combination with one or more block or impact copolymers wherein a tensile strength of the microporous polyolefin membrane with the at least one block or impact copolymer is greater than a tensile strength of a microporous polyolefin membrane without the at least one block or impact copolymer; and wherein said polyolefin in combination with one or more block or impact copolymers uses either 1-80% impact copolymer or 5-30% impact copolymer.
2. The battery separator of claim 1 wherein said at least one microporous polyolefin membrane comprises impact copolymer either alone or in combination with isotactic polypropylene.
3. The battery separator of claim 1 wherein said at least one microporous polyolefin membrane comprises a monolayer, a laminated trilayer, or a coextruded trilayer.
4. The battery separator of claim 1 wherein said at least one microporous polyolefin membrane is coated with a polymer or ceramic coating before use in a battery.
5. The battery separator of claim 1 wherein said microporous polyolefin membrane has a thickness of about 10-30 μm.
6. The battery separator of claim 1 wherein said microporous polyolefin membrane has a thickness of about 15-25 μm.
7. The battery separator of claim 1 wherein said at least one block or impact copolymer is made of propylene and ethylene monomers.