In this work, copolymerization of urea formaldehyde (UF) and urea acetaldehyde (UA) was successfully carried out. Some physical properties such as gel time, viscosity, density, melting point, moisture uptake, refractive index and formaldehyde emission level were evaluated. The IR analysis of spectra from the pure amino resins and their copolymer (UF + UA) showed chemical interaction between urea formaldehyde and urea acetaldehyde resins. Resin from the copolymer possessbetter optical property, flexibility and softness, density, water resistance and better control of formaldehyde emission than the convectional urea formaldehyde resin. Some physical properties of the copolymer showed that properties such as viscosity, refractive index, moisture uptake, melting point and density are in agreement with the literature values of other type of binders use in paints. Therefore, the urea formaldehyde and urea acetaldehyde copolymer resin present itself as a potential binder for emulsion paint formulation.
Key words: Amino resin, copolymerization, binder, paint.
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