POLYVINYLIDENE FLUORIDE RESIN FILM, MULTILAYER FILM, BACKSHEET FOR SOLAR CELL MODULE, AND FILM MANUFACTURING PROCESS

• Main Authors: SATO YUSUKE, HOSODA TOMONORI, OBA HIROYUKI, AKATSU MASAMICHI, KOMATSUZAKI TETSUYA
• Format: Patent
• Language: English; Korean
• Published: 05.03.2014
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; 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; SEMICONDUCTOR DEVICES; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING-UP

The invention provides a polyvinylidene fluoride resin (PVDF) film in which a crystal structure determined from an absorbance by an infrared absorption spectrum is such that a proportion of a ²-type crystal is 10% or more based on the sum total of an ±-type crystal and the ²-type crystal, further preferably a film whose tensile modulus in TD at 120°C is 90 MPa or less, or a film in which a ratio of its tensile modulus in TD at a temperature of 100°C to its tensile modulus in TD at a temperature of 23°C is 4% or less, in particular an extruded film, a backsheet for solar cell module, which comprises the film, and a production process of the film, which comprises quenching a PVDF sheet-shaped material melt-extruded at 5 to 70°C and preferably then subjecting the quenched material to a heat treatment.