Patent ID: 8294040
Filing Date: 2012-10-23
Classification: B32B,H05K,Y10T

Abstract:
1. A multilayer assembly having a base and a porous layer arranged on at least one surface of the base, the porous layer having a large number of continuous micropores with an average pore diameter of 0.01 to 10 μm, wherein the multilayer assembly suffers from no interfacial delamination between the base and the porous layer when the multilayer assembly is examined in a tape peeling test wherein a 24-mm wide masking tape [Film Masking Tape No. 603 (#25)] supplied by Teraoka Seisakusho Co., Ltd. is applied to a surface of the porous layer and press-bonded to the porous layer with a roller having a diameter of 30 mm and a load of 200 gf to give a sample; and the sample is subjected to a T-peel test with a tensile tester at a peel rate of 50 mm/min, wherein the base has a large number of through holes, wherein the porous layer is arranged on the at least one surface of the base by casting a polymer solution onto the base, introducing the casted base into a coagulation bath, and drying, wherein the polymer solution is a solution mixture comprising 8 to 25 percent by weight of a polymer component, 5 to 50 percent by weight of a water-soluble polymer, 0 to 10 percent by weight of water, and 30 to 82 percent by weight of a water-miscible polar solvent, wherein the polymer component is at least one selected from the group consisting of polyimide resins, polyamideimide resins, poly(ether imide) resins, aromatic polyamide resins, and polyamide resins, and wherein the material of the base having a large number of through holes is at least one selected from the group consisting of polyimide resins, polyamideimide resins, poly(ether imide) resins, liquid crystalline polyester resins, aromatic polyamide resins, poly(ethylene terephthalate) resins, and poly(ethylene naphthalate) resins.