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Volume 43, Issue 7
Displaying 1-6 of 6 articles from this issue
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Yoshihiro NAKASHIMA, Michiharu KAWAI1970 Volume 43 Issue 7 Pages 319-324
Published: July 30, 1970
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSIn order to confirm the effect of added polymers on the migration efficiency, 10% aqueous solutions of acrylic polymer containing polyvinylpyrrolidone and polyacrylamide with different molecular weights were electrodeposited under various conditions.
The results show that the efficiency of migration is much affected by the type of added polymers, their molecular weight and applied voltage as well as the molecular weight of the acrylic copolymer. However, it becomes clear that the temperature and pH of the solutions and electrodeposion period are not effective to increase the migration efficiency. Taking these experimental facts into account, we assume that a greater part of added polymer migrates to the electrode preferentially in entangling together with acrylic polymers.View full abstractDownload PDF (702K) -
Measurement of Particle Size Distribution of Phthalocyanine Blue by Centrifugal Sedimentation MethodYukichi TOYOSHIMA, Mitsuo ONO, Osamu YAUCHI1970 Volume 43 Issue 7 Pages 325-332
Published: July 30, 1970
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSThe pretreating and centrifugal conditions which are necessary for the measurement of particle size distribution of phthalocyanine blue by the ICI/Joyce Loebl disc centrifuge are described.
To determine the optimum pretreating condition for the aqueous phthalocyanine blue dispersion, the dispersing conditions by a mixer or the ultrasonic wave (treating time, 'rotation number of mixer, ultrasonic output power, etc.) and the change in dispersibility with time are investigated in the presence of Triton X-100 as a suitable dispersing agent. Further, the effects of the components of the dispersion medium and the spin fluid on the dispersibility in the “buffered layer” technique are investigated and the particle size distributions obtained under the suitable condtions thus selected are compared with that of the homogeneous technique. Ultrasonic wave treatment by high output power (above 400W) and for long time (one hr. or more) in the presence of an appropriate amount of a suitable dispersing agent is highly effective, or probably essential for obtaining the most stable and the best dispersion of the pigment consisting of primary particles. In the case of the dispersion pretreated as above, the change in dispersibility with time is not observed. The particle size distributions of the pigment obtained under the suitable conditions of the “buffered layer” technique coincide well with that of the homogeneous technique. It is further confirmed by the electron microscopic observation and BET nitrogen adsorption method that the particle size distribution of the primary particles is obtained under the proper conditions only of applying ultrasonic wave pretreatment of extremely high power and long time.View full abstractDownload PDF (1007K) -
Masafumi ARAKAWA1970 Volume 43 Issue 7 Pages 333-343
Published: July 30, 1970
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (1750K) -
Masumi KOISHI, Tamotsu KONDO1970 Volume 43 Issue 7 Pages 344-356
Published: July 30, 1970
Released on J-STAGE: November 20, 2012
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Akinori MUTA, Shigeki WATANABE1970 Volume 43 Issue 7 Pages 357-363
Published: July 30, 1970
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (1163K) -
Yukichi TOYOSHIMA1970 Volume 43 Issue 7 Pages 364-369
Published: July 30, 1970
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (800K)
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