| 摘要 |
PURPOSE:To obtain a homogeneous dielectric film that is high in dielectric constant and dielectric strength and can be spread widely, by forming an uncrosslinked polyvinylidene fluoride type resin having a specified inherent viscosity value by a solution process into a film having a specified degree of surface orientation and a specified thickness. CONSTITUTION:To a copolymer (A) of 95mol% or more vinylidene fluoride (i) and 5mol% or less copolymerizable monomer is added a mixed resin (B) 95wt% or more vinylidene fluoride homopolymer or vinylidene fluoride copolymer and another polymer (e.g. a polymethacrylic acid methyl ester, etc.), then a solvent (C) (e.g. dimethylformamide, etc.) is added to produce a solution containing 0.3- 20wt% of the resins, and then a film is formed whose inherent viscosity is 2.2dl/g or more that is measured as a DMF solution having a concentration of 0.4g/dl at 30 deg.C. Then the intended film is produced whose degree of surface orientation is 0.25 or more and thickness is 10mum or less. USE:It can be used as a condenser film. |
