Boehmite and base coat layer for magnetic recording medium

摘要

The present invention provide a boehmite in which (i) a crystallite diameter in the direction perpendicular to the plane (020) is about 65 angstrom or longer and (ii) a ratio of a crystallite diameter in the direction perpendicular to the plane (002) to a crystallite diameter in the direction perpendicular to the plane (200) is about 1.8 or more. By using the boehmite as a non-magnetic pigment, a base coat layer for magnetic recording medium having an excellent surface smoothness can be obtained.