BIAXIALLY ORIENTED POLYPROPYLENE FILM, MULTILAYERED FILM INCLUDING METAL FILM, AND FILM CAPACITOR

• Main Authors: FUJIMOTO, Soichi, ASANO, Tetsuya
• Format: Patent
• Language: English; French; Japanese
• Published: 11.05.2017
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; BASIC ELECTRIC ELEMENTS; CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES ORLIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE; CHEMISTRY; COMPOSITIONS BASED THEREON; ELECTRICITY; GENERAL PROCESSES OF COMPOUNDING; INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS; 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

Provided are a biaxially oriented polypropylene film excellent in terms of processability for element fabrication and high-temperature withstand voltage characteristics, a multilayered film including a metal film, and a film capacitor. The biaxially oriented polypropylene film of the present invention comprises a polypropylene resin as the main component, wherein at least one surface has an arithmetic average roughness SRa of 0.03-0.10 µm and at least one surface has a maximum-valley depth SRv of 0.10-0.50 µm. When at least one surface of the film is examined for surface shape by a noncontact examination, then the volume of valley-side spaces present in a 1,252 µm × 939 µm field of view and having a depth of 0.05 µm or greater is 100-10,000 µm3. L'invention concerne un film de polypropylène à orientation bi-axiale excellent en termes d'aptitude au traitement pour la fabrication d'éléments et en termes de caractéristiques de tension de tenue à haute température, un film multicouche comprenant un film métallique, et un condensateur à film. Le film de polypropylène à orientation bi-axiale de la présente invention comprend une résine de polypropylène en tant que constituant principal, au moins une surface ayant une rugosité moyenne arithmétique SRa comprise entre 0,03 et 0,10 µm et au moins une surface étant dotée d'une profondeur de vallée maximale SRv comprise entre 0,10 et 0,50 µm. Lorsqu'au moins une surface du film est examinée pour évaluer sa forme superficielle par un examen sans contact, le volume des espaces côtés vallée présents dans un champ de vision de 1 252 µm × 939 µm et ayant une profondeur de 0,05 µm ou plus est dans la plage de 100 à 10 000 µm3. 素子加工性、高温耐電圧特性に優れる二軸配向ポリプロピレンフィルム、金属膜積層フィルムおよびフィルムコンデンサを提供すること。本発明は、ポリプロピレン樹脂を主成分とする二軸配向ポリプロピレンフィルムであって、少なくとも片面の算術平均粗さＳＲａが０．０３～０．１０μｍであり、少なくとも片面の最大谷深さＳＲｖが０．１０～０．５０μｍであり、かつ、少なくとも片面において、非接触表面形状測定による１，２５２×９３９μｍの範囲の視野面積中に存在する、深さ０．０５μｍ以上の谷側空隙体積が１００～１０，０００μｍ３である二軸配向ポリプロピレンフィルムとする。