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METHOD FOR PRODUCING MICROPOROUS MEMBRANE OR MICROPOROUS STRETCHED FILM, AND MICROPOROUS FILM OR MICROPOROUS BIAXIALLY STRETCHED FILM
METHOD FOR PRODUCING MICROPOROUS MEMBRANE OR MICROPOROUS STRETCHED FILM, AND MICROPOROUS FILM OR MICROPOROUS BIAXIALLY STRETCHED FILM
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机译:制备微孔膜或微孔拉伸膜的方法,以及微孔膜或微孔双轴拉伸膜
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摘要
PROBLEM TO BE SOLVED: To provide a method for obtaining a chemically modified cellulose nanofiber (chemically modified CeNF) reinforced microporous membrane which has a high void ratio and excellent air permeability, and has improved dynamic physical properties and heat resistance.SOLUTION: A method for producing a microporous membrane or a microporous stretched film includes: preparing a resin composition which contains polypropylene (PP) as a resin component, and contains 0.01-10 pts.wt. of chemically modified CeNF and 0.01-3 pts.wt. of a β crystal-nucleating agent, with respect to 100 pts.wt. of the resin component; melting and forming the resin composition into a film-like object where a crystal phase of a polypropylene component in the resin composition is substantially a β crystal phase, and a β-crystallization forming ability is preferably 70% or more; and then stretching the film-like object at a temperature of 90-155°C.SELECTED DRAWING: None
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