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Preparation of core-shell latex from co-polymer of styrene-butyl acrylate-methyl methacrylate and their paint properties

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Purpose ‐ The purpose of this paper is to study the effect of monomer composition in core-shell latex prepared from co-polymer of styrene-butylacrylate (BA)-methyl methacrylate (MMA) and their paint properties. Design/methodology/approach ‐ The core-shell latex was prepared by a stepwise semi-batch emulsion polymerisation. A set of dispersion was made with the different core-shell compositions. The core phase consists of a copolymer of styrene-BA-acrylic acid (AA) and the shell phase consists of a copolymer of MMA-AA. The properties of latex were determined by solid content, viscosity, pH and particle size. Subsequently, emulsion paint (PVC-37 per cent and NVM-53 per cent) was prepared using core-shell latex. The paint properties were determined by block resistance, gloss, elongation at break, etc. The particle morphology was characterised with transmission electron microscope (TEM). Findings ‐ Core-shell structure of latex was confirmed by TEM. The performance of core-shell latex has been optimised and the best combination achieved with 25-40 per cent of hard phase in core-shell latex. Research limitations/implications ‐ Although the core-shell structured latex was prepared from co-polymer of styrene-BA-MMA monomer, the system could be extended with other monomers depending on the end use of surface coating. Practical implications ‐ The paint industry may use this method to improve paint properties. Originality/value ‐ The paper shows that, by use of core-shell latex, it is possible to achieve high-block resistance, hardness, elasticity and gloss.
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Keywords: Chemical reactions; Elasticity; Hardness; Paints; Polymerization

Document Type: Research Article

Publication date: May 22, 2009

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