| abstract |
PURPOSE: To examine the physical property of the surface of particle material for a magnetic recording medium by analyzing a compound which is formed by aldol condensation reaction of a carbonyl compound and compound which is formed by dehydrating reaction of a β-hydroxycarbonyl compound. n CONSTITUTION: Particle material for magnetic recording medium and a carbonyl compound having hydrogen atoms are brought into contact. At this time, the carbonyl compound and α,β-double bonded carbonyl compound which is formed by the dehydrating reaction of β-hydroxycarbonyl compound are analyzed. The presence of a base point is found by the formation of the β-hydroxycarbonyl compound. The presence of an acid point is found by the formation of the α,β-double bonded carbonyl compound. n COPYRIGHT: (C)1989,JPO&Japio |