All issues
Predecessor
Volume 40, Issue 12
Displaying 1-4 of 4 articles from this issue
- |<
- <
- 1
- >
- >|
-
Fumio IDE, Kenji OKANO, Shintaro NAKANO, Kazuo NAKATSUKA1967 Volume 40 Issue 12 Pages 571-578
Published: December 30, 1967
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSThe polymerization reaction of vinyl propionate was compared with that of vinyl acetate. The rates of polymerization of vinyl propionate and vinyl acetate in toluene were proportional to [M] 2.3 and [M] 1.5, respectively. The corresponding initiator efficiencies were 0.79 and O.80, respectively. The chain transfer constants to monomer and to toluene were 3.6×10-4 and 1.4×10-4, respectively, for vinyl propionate 1.9×10-4 and 3.3×10-4, respectively, for vinyl acetate.
The rate of emulsion polymerization of vinyl propionate was slower than that of vinyl acetate, which is due to the difference in solubilities of the monomers to water. The monomer reactivity ratios of vinyl propionate and vinyl acetate were 1.0±0.1 and 0.9±0.2, respectively.
The film forming ability of the copolymer of these two monomers was better than those of the homopolymers. The mechanical properties and alkali resistance of the copolymer film were better than those of the homopolymers and the copolymer of vinyl acetate with ethyl acrylate.View full abstractDownload PDF (906K) -
Tadao KANEHIRO, Akira NAGAE1967 Volume 40 Issue 12 Pages 579-585
Published: December 30, 1967
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSVarious coloured pigments were mixed with zinc white and luminous reflection Yc was measured by a recording spectrophotometer. Yc, values were then transformed to Munsell values Vy. The plots of Vy values against the logarithms of weight ratio of the coloured pigment to zinc white gare sigmoidal curves which could be regarded as straight lines within a narrow range and parallel with each other. If it is statistically acceptable that the Vy-log (wt. ratio) plots for the standard and sample pigments are straight and parallel with each other, the logarithm of tinting strength, log (T. S.), can be calculated from log (T.S.) = Vy (A)-Vy (B) /b where Vy (A) and Vy (B) are the Munsell values of the standard and sample pigments, respectively and b the regression coefficient of the standard pigment.
Six kinds of ultramarine were blended in an acrylic resin with zinc white at four levels of weight ratio (four repititions). The luminous reflectances of the 96 films obtained were measured and transformed to Munsell values. The regression equations for the six pigments were calculated by the methods of least squares. The tests of linear regression showed that three of the six regressions fitted to linear equation. The tests of significance of difference in the regression coefficient of the standard pigment with those of the sample pigments showed that they could be regarded as parallel with one another.View full abstractDownload PDF (868K) -
Shigeru NISHIDA, Takeshi TAKAHASHI1967 Volume 40 Issue 12 Pages 586-607
Published: December 30, 1967
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (2632K) -
Particle Size and Properties of Organic PigmentsKiyoshi HASHIZUME1967 Volume 40 Issue 12 Pages 608-613
Published: December 30, 1967
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (728K)
- |<
- <
- 1
- >
- >|