Patent ID: 9023505
Filing Date: 2015-05-05
Classification: H01M,Y02E

Abstract:
1. A separator comprising: a porous substrate having a plurality of pores; and a porous coating layer provided on at least one surface of the porous substrate and formed from a mixture of plural inorganic particles and a binder polymer, wherein the binder polymer includes a composition comprised of an acryl-based copolymer cured with an isocyanate-based crosslinking agent, the acryl-based copolymer is a copolymer including (a) a first monomer unit with a tertiary amine group, (b) a second monomer unit with at least one functional group selected from an amine group other than a tertiary amine group, an amide group, a cyano group, and an imide group, (c) a third monomer unit of (meth)acrylate with a carboxyl group, (d) a fourth monomer unit of (meth)acrylate with a hydroxyl group, and (e) a fifth monomer unit of (meth)acrylate with an alkyl group having 1 to 14 carbon atoms, and a content of the first monomer unit is 0.5 to 20 parts by weight, a content of the second monomer unit is 30 to 60 parts by weight, a content of the third monomer unit is 0.1 to 2 parts by weight, a content of the fourth monomer unit is 0.5 to 10 parts by weight, and a content of the fifth monomer unit is 8 to 68 parts by weight, based on the total acryl-based copolymer.