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    Film formation of Alkali Soluble Resin (ASR) stabilized latexes

    Year: 2021

    Journal: Prog. Org. Coat., Volume 159, OCT

    Authors: Brito, Elvis Lopes; Ballard, Nicholas

    Organizations: Industrial Liaison Program in Polymerization in Dispersed Media; 3M; Akzo Nobel; Allnex; Arkema; Asian Paints; BASF; DSM; Elix polymers; Inovyn; Stahl; Synthomer; Vinavil; Wacker

    Keywords: Film formation; Emulsion polymerization; Alkali soluble resin; Hydroplasticization

    Alkali soluble resin (ASR) stabilized latexes are commonly employed in the development of waterborne coatings with good mechanical properties. However, despite their widespread use, little is known about how the nature of the hydroplasticized, high T-g ASR influences the film formation process and how systems can be designed to minimize the minimum film formation temperature (MFFT). In this work we synthesize a series of ASRs and ASR stabilized latexes in order to explore how the ASR influences the drying and deformation processes occurring during film formation. It is shown the ASR absorbs water and serves to increase the effective volume fraction of polymer during drying. Despite often being considered as an aqueous solution, the ASR behaves more like a conventional colloidal polymer and its film formation behavior is dictated by the wet T-g of the ASR. In ASR/latex blends both the wet T-g of the ASR and the T-g of the main emulsion polymer affects the MFFT. It is shown that high T-g ASRs (T-g > 100 degrees C) can be easily used in formulations that have MFFT <20 degrees C. In addition, for latexes with high T-g (T-g > 60 degrees C), using correct design strategies, hydroplasticized ASRs can be employed to lower the MFFT to below ambient temperature. These insights should allow for the effective development of latex films with low MFFT but mechanical properties more comparable to their solvent based counterparts.
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