THIN FILM OF FLUORINATED POLYMER AND FORMATION OF THIN FILM

• Main Authors: KANBA MOTOI, MATSUO HITOSHI
• Format: Patent
• Language: English
• Published: 27.10.1988
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; COMPOSITIONS BASED THEREON; GENERAL PROCESSES OF COMPOUNDING; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING-UP

PURPOSE:To make it possible to produce a nondefective thin film smoothly in an industrially advantageous manner, by using a fluorinated polymer having a ring structure in the main chain and forming a thin polymer film from a solution formed by dissolving this polymer in a solvent. CONSTITUTION:A fluorinated polymer having a ring structure in the main chain (e.g., a polymer having a ring structure of formula I, II or III) is dissolved in a solvent (e.g., perfluorobenzene or trichlorotrifluoroethane), and the solution is formed into a thin polymer film by a thin film formation process such as dipping or spin coating. In this way, a thin film of a thickness <=50mu can be produced smoothly in an industrially advantageous manner. Because a polymer having a perfluoro ring in the main chain is soluble in a solvent even when it is a homopolymer, it is soluble when it is a polymer or copolymer of a high fluorine content. The obtained thin film does not undergo decrease in the characteristics as a fluororesin, such as low refractive index, high heat resistance, low moisture permeability, high electrical resistance, high dielectric breakdown strength, etc. and is transparent because of its low crystallinity.