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公开(公告)号：JPS6241991B2
公开(公告)日：1987-09-05
申请号：JP22770885
申请日：1985-10-15
Applicant: MITSUI TOATSU CHEMICALS
Inventor： NISHIZAWA ISAO , TSUKAHARA RYOICHI , MORINAKA RYOICHI , HIDAKA TSUNEO
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公开(公告)号：JPS6046152B2
公开(公告)日：1985-10-14
申请号：JP16706981
申请日：1981-10-21
Applicant: MITSUI TOATSU CHEMICALS
Inventor： MORINAKA RYOICHI , TSUKAHARA RYOICHI , NISHIZAWA ISAO , HIDAKA TSUNEO
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公开(公告)号：JPS56100885A
公开(公告)日：1981-08-13
申请号：JP310080
申请日：1980-01-17
Applicant: MITSUI TOATSU CHEMICALS
Inventor： NISHIZAWA ISAO , TSUKAHARA RIYOUICHI , MORINAKA RIYOUICHI , HIDAKA TSUNEO
Abstract: NEW MATERIAL:An anthraquinone derivative shown by formula I (wherein R is H, 1-15C straight or branched alkyl, cyclohexyl). EXAMPLE:A compound shown by formula II. USE:A dyestuff coloring a nematic liquid crystal to a clear favorable blue color and having an extremely high two-color ratio (contrast) and excellent light fastness. PREPARATION:1,5-Dihydroxy-4,8-diamino-anthraquinone-2,6-disulfonic acid and a compound shown by formula III (wherein R1 is H, 1-15C straight or branched alkyl, cyclohexyl) are reacted in the presence of boric acid in sulfuric acid to oxidize a borate ester group and then desulfonated to synthesize the compound of formula I.
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公开(公告)号：JPS564678A
公开(公告)日：1981-01-19
申请号：JP8011079
申请日：1979-06-27
Applicant: MITSUI TOATSU CHEMICALS
Inventor： NISHIZAWA ISAO , MORINAKA RIYOUICHI , TSUKAHARA RIYOUICHI , HIDAKA TSUNEO
Abstract: PURPOSE:To provide titled compsn. which is colored red by the application of electric voltage, consisting of a specified anthraquinone compd. and a nematic liquid crystal. CONSTITUTION:1.5-Diamino-4,8-dihydroxy-anthraquinonedisulfonic acid is reacted with a compd. of formula I [wherein R1 is 1-15C alkyl or a group of formula -R2- 0-R3 (wherein R2 is 1-3C straight or branched chain alkylene; R3 is 1-15C straight or branched chain alkyl] in the presence of boric acid and in sulfuric acid. The resulting product is reacted with a reducing agent to remove the sulfonic group. The amino group are replaced with hydroxyl group to obtain an anthraquinone compd. of formula II. 0.1-3% of the anthraquinone compd. is blended with a nematic liquid crystal to obtain the desired compsn. for liquid crustal color display element. The compsn. exhibits large contrast ratio by the application of voltage-no voltage, excels in durability, is stable, and does not lower the performance of a device even when the device is used for many hours.
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公开(公告)号：JPS623194B2
公开(公告)日：1987-01-23
申请号：JP8011079
申请日：1979-06-27
Applicant: MITSUI TOATSU CHEMICALS
Inventor： NISHIZAWA ISAO , MORINAKA RYOICHI , TSUKAHARA RYOICHI , HIDAKA TSUNEO
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Patent Agency Ranking
公开(公告)号：JPS6136799B2
公开(公告)日：1986-08-20
申请号：JP6223479
申请日：1979-05-22
Applicant: MITSUI TOATSU CHEMICALS
Inventor： NISHIZAWA ISAO , MORINAKA RYOICHI , TSUKAHARA RYOICHI , HIDAKA TSUNEO
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公开(公告)号：JPS61148292A
公开(公告)日：1986-07-05
申请号：JP22884185
申请日：1985-10-16
Applicant: MITSUI TOATSU CHEMICALS
Inventor： NISHIZAWA ISAO , TSUKAHARA RYOICHI , MORINAKA RYOICHI , HIDAKA TSUNEO
Abstract: PURPOSE:To obtain the titled composition having high coloring power, dichroic ratio, contrast and compatibility, and excellent stability and durability, by dissolving specific quinophthalone-type and thioindigo-type dichroic dyes in a nematic liquid crystal having positive dielectric anisotropy. CONSTITUTION:The objective composition can be produced by dissolving (A) a quinophthalone dye of formula I (X is H or halogen; n is 1-3) (e.g. the compound of formula II) and/or (B) a thioindigo dye of formula III (R1 and R2 are H or alkyl) (e.g. the compound of formula IV) in a nematic liquid crystal having positive dielectric anisotropy.
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公开(公告)号：JPS6115915B2
公开(公告)日：1986-04-26
申请号：JP3005779
申请日：1979-03-16
Applicant: Mitsui Toatsu Chemicals
Inventor： MORINAKA RYOICHI , TSUKAHARA RYOICHI , NISHIZAWA ISAO , HIDAKA TSUNEO
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公开(公告)号：JPS55157676A
公开(公告)日：1980-12-08
申请号：JP6399679
申请日：1979-05-25
Applicant: MITSUI TOATSU CHEMICALS
Inventor： NISHIZAWA ISAO , MORINAKA RIYOUICHI , TSUKAHARA RIYOUICHI , HIDAKA TSUNEO
IPC: C09K19/60 , C09B1/02 , C09B1/14 , C09B1/16 , C09B1/28 , C09B1/32 , C09B1/50 , C09B1/514 , C09B1/515 , C09B1/54 , G02F1/13 , G02F1/137 , G09F9/00 , G09F9/35
Abstract: PURPOSE:The title composition, usable for a color display on a watch or electronic calculator by the guest-host method, having improved coloring property, dichromatic ratio and durability, and comprising a specific anthraquinone dye and nematic liquid crystals. CONSTITUTION:A composition comprising (A) an anthraquinone dye of formula I [X and Y are amino or hydroxy groups; Z is methoxy, formula II or III [R1 is H, halogen atom or 1-15C (branched) alkyl group] or -NH-R2 [R2 is 1-15C (branched) alkyl group)] and (B) nematic liquid crystals, e.g. a mixture of 4- cyano-4'-n-pentylbiphenyl with 4-cyano-4'-n-propoxybiphenyl. The amount of (A) is preferably 0.1-3% based on (B). The dye (A) is obtained by recrystallizing a crude dye prepared from phenol and 1-amino-2-bromo-4-hydroxyanthraquinone from an organic solvent.
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公开(公告)号：JPS54152636A
公开(公告)日：1979-12-01
申请号：JP6060878
申请日：1978-05-23
Applicant: MITSUI TOATSU CHEMICALS , ORIENT KK
Inventor： YANO NAOYUKI , YAMAMOTO TADASHI , HIDAKA TSUNEO , MURAOKA TERUYOSHI
Abstract: PURPOSE:To provide superior corrosion resistance even to a thin gold plated film by dipping a product, in an aq. alkaline chromate soln., obtd. by plating a silver base material with gold followed by electrolysis using the product as a cathode. CONSTITUTION:A product obtd. by plating a silver base material with gold is dipped in an aq. alkaline chromate soln. of pH>=9 pref. contg. phosphoric acid or a phosphate followed by electrolysis using the product as a cathode at a current density of 0.3-0.5 A/dm for 1-5 min. By this method formation of a corrosive film can be prevented even in case of a gold plated film with such a small thickness as 1-3 mu.
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