SEMICONDUCTIVE FLUORORESIN TUBULAR FILM AND ITS MANUFACTURING METHOD

• Main Authors: KONISHI NORIFUMI, ONISHI KAZUAKI, NAKAI KOICHI
• Format: Patent
• Language: English
• Published: 25.11.2004
• Edition: 7
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WORKING-UP

PROBLEM TO BE SOLVED: To provide a semiconductive fluororesin belt which is used in a color printer or the like, has a stable electric resistance, and enables its electric resistance to be easily specified. SOLUTION: The semiconductive fluororesin tubular film is manufactured from a molding material formed by homogeneously dispersing a conductive carbon black in a fluororesin mixture consisting of a fluororesin having a small melt flow rate (MFR) and a fluororesin having a large melt flow rate, the melt flow rate of the latter fluororesin being 2-25 times that of the former fluororesin. Preferably, the molding material is subjected to melt kneading at least twice, then pelletized, and subjected substantially to non-stretch forming to give the tubular film. The film is made so that its ρs and ρv are each in a range of 1×1010to 5×1014; the dispersion of them are each 1.5 digit or less; and the number of digits of ρv is larger than that of ρs by 0.5-4 digits. COPYRIGHT: (C)2005,JPO&NCIPI