Kenichi Matsunaga

Bio: Kenichi Matsunaga is an academic researcher from Kao Corporation. The author has contributed to research in topics: Dyeing & Alkyl. The author has an hindex of 10, co-authored 21 publications receiving 605 citations.

Hair-dye composition

Abstract: A hair dye composition containing a triazene dissociative direct dye represented by general formula (1): A-N=N-NH-B (1) wherein A and B are each a monocyclic or a bicyclic aromatic heterocyclic group that may have a substituent or a monocyclic or a bicyclic aryl group that may have a substituent and contain none of a carboxy group, a sulfo group and a quaternary ammonium group; and A and B each bind to a triazene-1,3-diyl group represented by -N=N-NH- via a carbon atom within A and B each. A and B may be the same or different.

Use of a compound for dyeing hair

Abstract: A hair dye composition which comprises a direct dye selected from the compounds represented by the formula (I). This hair dye composition has markedly hair dyeing power, has less color fade over time and does not undergo a change in the color shade of the dye even after storage. Awherein, R represents H, (substituted) lower alkyl or aralkyl, R represents (substituted) lower alkyl, aralkyl or (substituted) phenyl, R represents H, halogen, lower alkyl or lower alkoxy, R represents lower alkyl or (substituted) phenyl, R represents H, halogen, lower alkyl or lower alkoxy, R and R each represents lower alkyl, R represents H, methyl or cyano, and A represents anion.U

Hair dyeing agent composition

Abstract: PROBLEM TO BE SOLVED: To obtain the subject composition while suppressing the coloring of skin, excellent in dyeing property to hair and also having a good shampoo fastness by containing an acid dyestuff and a specific alkylene carbonate for specifying pH and a buffering function. SOLUTION: This hair dyeing agent composition is obtained by containing (A) 0.2-5 wt.% acid dyestuff and (B) 9.5-50 wt.% alkylene carbonate (e.g.; propylene carbonate) so as to make pH at 2.0-6.0, preferably 2.0-5.0 and more preferably 2.5-4.0, and ≥0.007 g equivalent/L and <0.2 g equivalent, preferably, ≥0.01 g equivalent/L and <0.2 g equivalent buffering function. The buffering function is a value obtained by using the formula: Buffering function = |dCB /dpH| [CB is an ionic concentration (g equivalent /L) of a base] based on the concentration of the base required for increasing pH of a 10% aqueous solution of the composition at 250°C by 1 from its initial value. COPYRIGHT: (C)2000,JPO

Dye composition for a keratinous fiber.

Abstract: A dye composition for a keratinous fiber comprising a developer and a coupler, wherein the coupler is a 2- substituted amino-5-alkylphenol derivative represented by the following formula (1): wherein the all symbols are defined in the disclosure, is disclosed. The dye composition imparts a color tone of a high chroma and is excellent in coloring power and fastness.

Hair treatment composition comprising alkalizing agent

Abstract: The invention relates to a hair treatment composition comprising (a) a guanidium salt, (b) an alkalizing agent other than the guanidium salt and (c) a silicone. The use of the hair treatment composition permits brightening the color tone of the hair or dyeing the hair in good shades from a bright shade to a deep shade. The composition scarcely damages the hair, gives off little irritating odor and has low irritativeness to the scalp.

Method for frequency division duplex communications

Abstract: The high quality PCS communications are enabled in environments where adjacent PCS service bands operate with out-of-band harmonics that would otherwise interfere with the system's operation. The highly bandwidth-efficient communications method combines a form of time division duplex (TDD), frequency division duplex (FDD), time division multiple access (TDMA), orthogonal frequency division multiplexing (OFDM), spatial diversity, and polarization diversity in various unique combinations. The method provides excellent fade resistance. The method enables changing a user's available bandwidth on demand by assigning additional TDMA slots during the user's session.

Hair dyeing composition

Abstract: Hair dye agent based on a developer-coupler system reacting with peroxide contains (a) at least one developer selected from 2-(2'-hydroxyethylamino)-5-aminotoluene (Ia), 1-amino-4-bis-(2'-hydroxyethyl)aminobenzene (Ib) and 2-(2,5-diaminophenyl)ethanol (Ic) and their water-soluble salts; (b) 5-amino-2-methylphenol (II); and (c) 4-amino-3-methylphenol (III).

Hair-dye composition

Abstract: A hair dye composition containing a triazene dissociative direct dye represented by general formula (1): A-N=N-NH-B (1) wherein A and B are each a monocyclic or a bicyclic aromatic heterocyclic group that may have a substituent or a monocyclic or a bicyclic aryl group that may have a substituent and contain none of a carboxy group, a sulfo group and a quaternary ammonium group; and A and B each bind to a triazene-1,3-diyl group represented by -N=N-NH- via a carbon atom within A and B each. A and B may be the same or different.

Keratin dyeing compounds, keratin dyeing compositions containing them, and use thereof

Abstract: Tricyclic 5-6-5 heteroaromatic keratin dyeing compounds having two heteroatoms. Compositions for the oxidative dyeing of keratin fibers, comprising a medium suitable for dyeing and one or more tricyclic 5-6-5 heteroaromatic keratin dyeing compounds having two heteroatoms. A method for oxidative dyeing of keratin fibers, comprising applying such compositions in the presence of an oxidizing agent, for a period sufficient to develop the desired coloration.