평활성이 우수한 유기-무기 복합막 및 이를 이용한 다층 내열 세퍼레이터재

• Main Authors: SAKAMOTO KAZUYUKI, FUKUDA HIROKAZU, ITOU SHINGO, ENOKI NOBUO
• Format: Patent
• Language: Korean
• Published: 11.07.2018
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOSITIONS BASED THEREON; ELECTRICITY; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING

평활성, 기재 필름의 미세 다공질 특성의 유지, 기재와 내열층의 밀착성 등을 균형있게 구비하는 다층 내열 세퍼레이터재용의 유기-무기 복합막이 제공된다. 폴리올레핀제 미세 다공막으로 이루어지는 기재 필름의 적어도 한쪽 면에 무기 내열 입자와 유기 용매 가용성의 바인더를 포함하는 내열층이 설치된 유기-무기 복합막에 있어서, 상기 무기 내열 입자가 평균 입자 직경이 0.2㎛ 미만인 소입자 F(a)와 평균 입자 직경이 0.2㎛ 이상인 대입자 F(b)를 포함하는 유기-무기 복합막으로 한다. Provided is an organic-inorganic composite membrane which is to be used for a multi-layer heat resistant separator material, and which achieves a fine balance among smoothness, preservation of microporous property of a substrate film, and adhesion between a substrate and a heat-resistant layer. This organic-inorganic composite membrane has, on at least one side of a substrate film comprising a polyolefin microporous membrane, a heat resistant layer including inorganic heat resistant particles and a binder that is soluble in an organic solvent, wherein the inorganic heat resistant particles includes small particles F(a) having an average particle diameter smaller than 0.2 µm and large particles F(b) having an average particle diameter not less than 0.2 µm.