Invention Grant
- Patent Title: Method for analyzing degree of hydrophobicity of powder, highly hydrophobized coloring pigment, and cosmetic containing said coloring pigment
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Application No.: US16616254Application Date: 2018-05-23
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Publication No.: US11639885B2Publication Date: 2023-05-02
- Inventor: Tetsuya Inukai , Mitsugu Saito , Tomoki Okawa , Masanao Kamei , Hiroyuki Moriya , Chihiro Hayakawa , Hiroko Kikuchi , Ryuichi Inaba
- Applicant: SHIN-ETSU CHEMICAL CO., LTD.
- Applicant Address: JP Tokyo
- Assignee: SHIN-ETSU CHEMICAL CO., LTD.
- Current Assignee: SHIN-ETSU CHEMICAL CO., LTD.
- Current Assignee Address: JP Tokyo
- Agency: Birch, Stewart, Kolasch & Birch, LLP
- Priority: JPJP2017-103654 20170525,JPJP2017-184723 20170926
- International Application: PCT/JP2018/019807 WO 20180523
- International Announcement: WO2018/216722 WO 20181129
- Main IPC: G01N13/00
- IPC: G01N13/00 ; G01N33/00 ; A61K8/06 ; A61K8/29 ; C09C1/24 ; C09C1/36 ; C09C3/12 ; A61Q1/06 ; A61Q1/10 ; A61Q1/12
Abstract:
The present invention addresses the problem of evaluating the hydrophobicity of a powder. According to the present invention, a powder is charged into a mixed solvent composed of a lipophilic solvent and a hydrophilic solvent, the voltage rate R of the mixed solvent is measured at predetermined time intervals while adding a lipophilic solvent to the mixed solvent charged with the powder, a parameter x correlating with the concentration of powder is defined for an arbitrary voltage rate R, a continuous function HP(x) of the ratio of a lipophilic solvent corresponding to x is defined, and HP(x) for required x is set as a representative value of a lipophilic solvent ratio distribution and used as an index of hydrophobicity.
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