| 摘要 |
PURPOSE:To provide a novel fluorine-containing carboxylic acid which is useful as a lubricant, a surfactant, a releasing agent or an anticorrosive agent showing no deterioration in lubricity even after storage under high-temperature and high-humidity conditions, particularly useful for magnetic recording medium. CONSTITUTION:A fluorine-containing carboxylic acid of formula I (R1 is aliphatic alkyl, aliphatic alkenyl; R2 is fluoroalkyl, fluoroalkenyl; (m) is integer of 1 or more; (n) is 0 or 1), for example, a compound of formula II. A magnetic recording medium is obtained by forming a ferromagnetic layer on a nonmagnetic medium coating the medium directly or through a protecting layer with one or more of the fluorine-containing carboxylic acid to form a lubricant layer. The compound of formula II is obtained by reaction of octadecylsuccinic adhydride of formula III with a fluoroalkyl adduct to alcohol of formula IV. The compound of formula I is characterized by having a fluorine-containing hydrocarbon terminus formed by direct addition of an aliphatic omega-alkenyl to the tail of fluorocarbon group. |
