Core/Shell Acrylic Microgel as the Main Binder of Waterborne Metallic Basecoats

Hong SM; Kim HS; Kim YB; Park JM

Korea Polymer Journal, Vol.7, No.4, 213-222, August, 1999

Core/shell acrylic microgel emulsions were prepared in order to investigate their pseudoplastic behavior in aqueous metallic basecoats. The most important variable for shell thickening effect were found to be the hydrophilicity of shell-forming copolymer, acid value, and the degree of neutralization, In addition, correlation between the orientation of aluminum flakes (OAF) and measurable rheological parameters in the metallic basecoats containing the microgel as a main binder was studied. Of the variables, viscoelastic property such as the ratio (G''/G'''') of storage and loss modulus revealed a relationship with observable appearance. When the appropriate amount of alkali swellable emulsion thickener having high G''/G'''' value was added to the microgel resin system having low G''/G'''' value, it has best orientation of aluminum flakes with optimum G''/G'''' value of around 1.0.

[References]

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[1] Park JM, Kim YB, Polym. Sci. Technol., 6(3), 242 (1995)

[2] Hong SM, Yoon JH, Kim YB, Park JM, Appl. Chem., 1(2), 583 (1997)

[3] Saatweber D, Vogt-Birnbrich B, Prog. Org. Coat., 14, 103 (1986)

[4] Willenbacher N, Frechen T, Schuch H, Lettmann B, Eur. Coat. J., Sep., 810 (1997)

[5] Mestach DE, FATIFEC CONGR, 23rd, vol. B, 245 (1996)

[6] Warson H, Polym. Paint Colour J., Feb., 36 (1997)

[7] Backhouse AJ, J. Coat. Technol., 54, 83 (1982)

[8] Ishikura S, Ishii K, Midzuguchi R, Prog. Org. Coat., 15, 373 (1988)

[9] Funke WE, J. Coat. Technol., 60, 67 (1988)

[10] Yagi T, Saito K, Ishikura S, Prog. Org. Coat., 21, 25 (1992)

[11] Backhouse AJ, U.S. Patent, 4,403,003 (1983)

[12] Byun KH, Kim SH, Park JM, U.S. Patent, 5,476,917 (1996)

[13] Toyo Aluminum K.K., Polym. Paint Colour J., Octover, 796 (1980)

[14] Tachi K, Okuba C, Suzuki S, J. Coat. Technol., 62, 43 (1990)

[15] Burstinghaus R, Goring W, Piontek S, Dirking T, Hingmann R, Proc. 15th Int. Conf. Org. Coatings Sci. & Technol. Athens, 81 (1990)

[16] Shiomi K, Taniguchi H, Beseche S, Paper 7 Presented at the 5th Asia Pacific Conference, Paint Research Association Internal Centre for Coatings Technology (1996)

[17] Harakawa H, Kasari A, Tominaga A, Yabuta M, Prog. Org. Coat., 34, 84 (1998)

[18] Laible R, van Beelen D, Water-Borne Higher Solids Coat. Symp., 16, 247 (1989)

[19] Fasano DM, Glen M, Linder LW, Williams E, U.S. Patent, 5,201,948 (1993)

[20] Shay GD, Hydrophilic Polymers: Performance with Environmental Acceptance, J. Edward, Ed., ACS, Washington D.C., pp. 675 (1989)

[21] Verbruge CJ, J. Appl. Polym. Sci., 11, 897 (1970)

[22] Casson N, Rheology of Disperse Systems, C. Mill, Ed., Wiley Interscience, N.Y. (1963)

[23] Unertl WN, Luo Y, Woodland D, Proc. Annu. Meet. Adhes. Soc., 19, 335 (1996)