Journal of the Japan Society of Colour Material
Online ISSN : 1883-2199
Print ISSN : 0010-180X
ISSN-L : 0010-180X
Volume 39, Issue 2
Displaying 1-5 of 5 articles from this issue
  • Thermal degradation of polystyrene, polymethylmethacrylate and acrylonitrile-styrene copolymer.
    Takemitu TAKAHASHI, Kenichi SUZUKI, Morio ABE
    1966 Volume 39 Issue 2 Pages 55-61
    Published: February 28, 1966
    Released on J-STAGE: November 20, 2012
    JOURNAL FREE ACCESS
    Authors investigated the effect of pigments affecting on thermal decomposition of polystyrene, polymethacrylate and styrene-acrylonitrile resins being marketed at present, purposing at their mold-processing, by the measurement of change in weight, change of viscosity and by the change of resin structure.
    1. STYRENE RESIN. In accordance with proceeding of thermal decomposition of the styrene resin, much quantities of the monomer were regenerated, decreasing the molecular weight with increase in the carbonyl radical and double bond in parallel. It was made clear that some additives such as, pigments and others, according to the kind of the additives, greatly affected on the decomposition. As for the kind of pigments, for instance, red iron oxide and cadmium red etc. had promoting effect and on the other hand cobalt blue and cyanine blue etc. had suppressing effect. This cause was reduced, from investigation on the effect of each metallic salts, as that it came from a catalytic action of iron or cadmium etc., as metal, onto the decomposition of polymer. For activation energy of the decomposition, it was measured as 23.4 kcal for blank and as 22 kcal for the mixing of red iron oxide.
    In case thermal decomposition in vacuo, the effect of additives was scarcely recognized. As for the effect on concentration of the additives, an increasing tendency was recognized in proportion with increase in the concentration, within range of 2 percent approximately, whereas the effect was recognized as comparatively smaller at more than that concentration.
    2. METHACRYLATE RESIN. Thermal decomposition of this resin also proceeds while it decreases the weight and as the viscosity lowers, however, an effect different from the case of styrene resin was made clear wherein the thermal decomposition of the resin at constant temperature was decreased for the change after a certain interval of time from the commencement of decomposition, reaching to a limited step without going further, and it was also made clear that the pigments affected onto the degree of the step. Such pigments as cadmium yellow and red iron oxide etc. effected as promoter for the decomposition, and similar tendencies were also recognized for oxides, carbonates and sulfates containing the same type of metals under consideration. Such effects were scarcely recognized in case in vacuo.
    3. ACRYLONITRILE-STYRENE COPOLYMER. In case decomposition of this copolymer, the. effect of pigments could obtain from similar means under the same principle, and which made clear the effect of the pigments, being comparatively decreased, and the promotion effect was confirmed for red iron oxide and for cadmium red etc. containing iron and cadmium as metal. Difference was not recognized in that carried out in vacuo. Effect on pH with the pigments was not recognized.
    In summary when compared the effect of pigments onto various type resins being marketed, the. authors believe there exists minor problem in the practice as for the three kinds of resin reported in this paper, as compared with the kind of resins previously reported for polypropylene, polyacetal and. polycarbonate which were more affected.
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  • Studies on New Water-Insoluble disazo pigments
    Kôzô TANAKA, Minoru HAGINOYA, Hidehiko SAKAI
    1966 Volume 39 Issue 2 Pages 62-68
    Published: February 28, 1966
    Released on J-STAGE: November 20, 2012
    JOURNAL FREE ACCESS
    Benzidine Yellows are the most important yellow pigment of disazo type for printing inks, paints, colouration of plastics, rubber, etc. In benzidine yellow pigments, it is known that the colour shade and the fastness to light and to organic solvents change by the influence of the substituents contained in benzene ring of acetoacetanilide, Authors tested the properties of new disazo pigment containing carbonamide or carbonanilide group in benzene ring of acetoacetanilide.
    Thus authors synthesized six acetoacetarylides, namely 1-acetoacetamino-benzene-3-carbonamide, 1-acetoacetamino-2-methoxy-benzene-5-carbonamide, 1-acetoacetamino-2-chlorobenzene-5-carbonamide, 1-acetoacetamino-benzene-3-carbonanilide, 1-acetoacetamino-2-methoxy-benzene-5-carbonanilide and 1-acetoacetamino-2-chloro-benzene-5-carbonanilide, and the six disazo pigments thus prepared are shown by the following formula :
    Y.HNOC-X-HNCO-CH-CO-CH3-N=N-Cl-Cl-N=N-CH-CO-CH3-CONH-X-CONH.Y
    wherein X represents hydrogen atom, chlorine atom or methoxy group, Y represents hydrogen atom or phenyl group.
    Authors could obtain these acetoacetarylides from the corresponding aromatic amine containing carbonamide group or carbonanilide group by the reaction of diketene or ethyl-acetoacetate. Then, authors prepared six pigments by coupling tetrazotized 3, 3'-dichlorobenzidine with acetoacetarylides.
    The disazo pigments newly synthesized gave generally reddish yellow shade. All pigments gave very good resistance to organic solvents than the well known benzidine pigments. Especially in the resistance to methanol and ethyl-acetoacetate, the three pigments containing carbonamide group gave better resistance than carbonanilide group. Also authors found that the methoxy group of the coupling component gave better effect in the resistance to light and organic solvents.
    As a result, the pigment prepared from 1-acetoacetamino-2-methoxy-benzene-5-carbonamide gave excellent resistance to light and organic solvents.
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  • Kazuyuki MIHARA, Tateki YUKUTA
    1966 Volume 39 Issue 2 Pages 69-76
    Published: February 28, 1966
    Released on J-STAGE: November 20, 2012
    JOURNAL FREE ACCESS
    Phosphoric acid ester of fatty acid-modified epoxy resin, which can be obtained by the esterification of epoxy resin with fatty acid in the first step and then with phosphoric acid, becomes a resin for use of paint which is perfectly emulsifiable in the water when the ester is neutralized with organic amine. An even coated film of the resin can be separated out on the surface of metal products when the metal piece immersed into aqueous dispersion of the resin is put on electric circuit by connecting the metal piece being cathode and iron piece being anode and with direct current of 30-60 volt.
    Authors investigated the composition and the conditions of the resin for coating by means of electrophoresis. In this report, the authors used an epoxy resin of epichlorohydrin-diphenylolpropane type (Epikote # 834, of Shell Chemical). As the fatty acid for esterification, lauric acid, palmitic acid, stearic acid, oleic acid, linolic acid and fatty acid of dehydrated castor oil, etc were selected, and each one mol of the fatty acid was used for one mol of epoxy resin for esterification, and subsequent estrification was made with one mol of phosphoric acid. Thus prepared ester was neutralized with triethanolamine and was dispersed into water so as the nonvolatile matter becomes 10%. Thus obtained emulsion was investigated for difference of electro-deposition property to be caused by the kind of fatty acid, and for characteristic of the film after dried. And additional investigation was made for the water soluble phenol resin to be used linking agent of the phosphoric acid ester of fatty acid-modified epoxy resin, thus prepared, in order to make clear that the phenolic resin merely mixed at a constant ratio into the emulsified aqueous solution of resin thus synthesized would be found in the electro-deposited film at the same mixed ratio as compared with that before coating. Upon experiments the following facts were made clear by the authors.
    1) As for the fatty acid, the oleic acid, linolic acid and fatty acid of dehydrated castor oily each of which is unsaturated fatty acid 18 of carbon numbers, were superior.
    2) In this synthesized product, the ratio of water soluble phenolic resin to the emulsified aqueous solution, at any optional mixing ratio, was approximately the same with that ratio contained in the electro-deposited film, and which was confiemed from log I0/I (1500 cm-1, 810 cm-1) of infrared spectrum for the coated film separated out.
    3) The electro-deposited film, which was prepared from phosphoric acid ester of linolic acid-modified epoxy resin by the neutralization with triethanolamine and then by mixing thereinto with 4-5 parts of water soluble phenolic resin to the 5-6 parts of thus neutralized product, was stable against boiling water for more than 50 hours.
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  • Minoru SYUNDÔ
    1966 Volume 39 Issue 2 Pages 77-83
    Published: February 28, 1966
    Released on J-STAGE: November 20, 2012
    JOURNAL FREE ACCESS
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  • Kôzô SATÔ
    1966 Volume 39 Issue 2 Pages 84-95
    Published: February 28, 1966
    Released on J-STAGE: November 20, 2012
    JOURNAL FREE ACCESS
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