Patent ID: 11961636
Assignee: NISSAN CHEMICAL CORPORATION
Field: Materials, metallurgy (Chemistry)
Classification: CPC H  C | IPC C  H

Claim 4:
5. The method for producing the insulating composition according to claim 4, wherein the aqueous sol of the silica particles (A) is produced through:
a step of preparing an aqueous dispersion of silica particles (a) by heating a silicate liquid obtained by cation exchange of an aqueous alkali silicate solution, and
the following steps (I) and (II):
step (I): a step of subjecting the aqueous dispersion of the silica particles (a) to any one of the following steps (I-i) to (I-iii):
step (I-i): a step of maintaining the aqueous dispersion at room temperature to 50° C. under acidic conditions with a pH of 1 to 4,
step (I-ii): a step of heating the aqueous dispersion at 100 to 200° C., and
step (I-iii): combination of the steps (I-i) and (I-ii); and

step (II): a step of subjecting the aqueous dispersion of the silica particles (a) that has been subjected to the step (I) to the following step (II-i) or (II-ii):
step (II-i): a step of performing cation exchange and anion exchange sequentially, or
step (II-ii): a step of performing cation exchange, anion exchange, and cation exchange sequentially.