The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 23, 2025
Filed:
Jan. 25, 2023
Nissan Chemical Corporation, Tokyo, JP;
Takeshi Nakada, Sodegaura, JP;
Kazuya Ebara, Sodegaura, JP;
Megumi Araki, Sodegaura, JP;
Masatoshi Sugisawa, Sodegaura, JP;
NISSAN CHEMICAL CORPORATION, Tokyo, JP;
Abstract
Silica particles have a dielectric loss tangent of 0.01 or less at 1 GHz and satisfy the requirements (i), (ii) and (iii): (i) an average primary particles diameter of 5 nm to 120 nm; (ii) a ratio of a specific surface area by water vapor adsorption (S) to a specific surface area by nitrogen adsorption (S); i.e., (S/S) of 0.6 or less; and (iii) a total silanol group content of 5% or less as determined by the following Formula (1): total silanol group content (%)=(Q2×2/4+Q3×1/4+Q4×0/4) . . . Formula (1) [in Formula (1), each of Q2, Q3 and Q4 is the proportion (%) of the peak areas derived from silicon atom structures], and a silica dispersion.