| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnetic iron oxide nanocomposite powdery particle which is highly dispersed for various solvents at a level of several tens of nanometers and has persistency in dispersibility. SOLUTION: The magnetic iron oxide nanocomposite powdery particle is characterized in that magnetic iron oxide particles are combined with fluoroalkyl group-containing oligomer represented by the general formula (1). In the formula, R<SP>1</SP>and R<SP>2</SP>represent -(CF<SB>2</SB>)p-Y group or -CF(CF<SB>3</SB>)-[OCF<SB>2</SB>CF(CF<SB>3</SB>)]q-OC<SB>3</SB>F<SB>7</SB>group, R<SP>1</SP>and R<SP>2</SP>may be the same or different from each other, Y in R<SP>1</SP>and R<SP>2</SP>represents hydrogen atom, fluorine atom or chlorine atom, and p and q denote integers of 0 to 10. B<SB>1</SB>represents 1-5C alkylene group, n3 denotes an integer of 5 to 1,000, and molar ratio of n1 to n2 is in the range of 1/99 to 99/1. COPYRIGHT: (C)2011,JPO&INPIT
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