| 摘要 |
A precursor sol of aluminum oxide (2) includes particles containing a hydrolysate and/or a condensate of an aluminum compound, a solvent, and an organo aluminum compound. When a pulsed-NMR T 2 relaxation curve of nuclide 1 H of the precursor sol of aluminum oxide (2) includes two components with different T 2 relaxation times and the component with the longer T 2 relaxation time has an abundance level of C L (%) and the component with the shorter T 2 relaxation time has an abundance level of C s (%), the relative proportion R CS (%) defined by [{C S / (C S + C L )} x 100] is in the range of 23.5% to 50.0%, both inclusive. |
