Silica particles and method for producing the same

[0256]Details of the exemplary embodiment of the present disclosure are described with reference to Examples below. Note that the exemplary embodiment of the present disclosure is not limited by Examples below. Hereinafter, “%” is on a mass basis unless otherwise specified.

Production of Silica Particles

Examples 1, 3 to 36, and 39 to 44

[0257]A suspension including silica particles of each example is prepared in the following manner.

[0258]Preparation of Alkali Catalyst Solution

[0259]Into a glass reaction container equipped with a metal stirring rod, a dropper nozzle, and a thermometer, a specific amount of methanol, ion-exchange water, and a specific amount of ammonia water (NH4OH) having a specific concentration are charged as described in Tables 1-1 and 1-2. The resulting mixture is stirred to form an alkali catalyst solution.

[0260]Granulation of Silica Base Particles by Sol-Gel Method

[0261]The temperature of the alkali catalyst solution is adjusted to 40° C. Then, the alkali catalyst solution is purged with nitrogen. Subsequently, while the alkali catalyst solution is stirred, the specific amount of tetramethoxysilane (TMOS) described in Tables 1-1 and 1-2 and 124 parts by mass of ammonia water (NH4OH) including a catalyst (NH3) at a concentration of 7.9% are added dropwise to the a

[0269]Silica particles are prepared as in Example 1, except that spray drying is performed with “Mini Spray Dryer B-290” produced by Nihon BUCHI K.K. while the temperature and pressure inside the cylinder are set to the temperature and pressure described in Tables 1-1 and 1-2 and the silica particle suspension is fed to the dryer at a rate of 0.2 L / hr.