A Clear Waterborne Plastic Coating

Premix water and the additives. Then add to the resin with stirring. Primal WL-81 (Rohm and Haas) is an aqueous thermoplastic acrylic resin, 41.5% nvc with an MFFT of 57 C. It does not contain co-solvents, which maximises formulating latitude. It can be crosslinked with monomeric methoxy melamines, e.g. Cymel 303, to give harder, more resistant films. 

Viscosity can be adjusted for different application methods, such as spray and brush, without external thickeners, which often detract from resistance properties, by the addition of amines. Less volatile amines result in slower hardness development. Under high relative humidity drying conditions, morpholine is superior for sprayability. 

Butyl glycol is a very good coalescent for Primal WL-81, but can be combined with other coalescents for optimum application characteristics. 

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