MFFT acrylic dispersion

NeoCiyl A-1049-U is an anionic aciylic dispersion, 40 %nvc with a MFFT of 40 C. NeoCiyl BT-21 is an acrylic dispersion, 40 %nvc. Sudranol 100 is a wax emulsion to improve water repellency. Steinapol SBDO-70 (Rewo) can be used as the wetting ad tive. For good film formation, a combination of coalescents and plasticisers are added. 

Abrasion and impact resistance of acrylic coatings can be improved with the addition of up to 30% of a water borne polyurethane. The addition of a polyurethane dispersion as a physical blend improves the inherent film strength and film formation of the aciylic latices. Polyurethanes generally have better film forming properties because of their lower MFFT at identical surface hardness. 

The millbase is dispersed in a Cowles disperser for 20 minutes before let down. Primal WL-81 (Rohm and Hass) is an aqueous thermoplastic acrylic resin, 41.5 %nvc with a 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. 

Most printing ink emulsions are resin supported . Printing ink emulsion polymers contain a support resin to reduce MFFT (minimum film forming temperature), and insure film coalescence. A support resin also decreases the need for surfactants. A support resin provides ink re-wettability, improves compatibility with pigment dispersions, and improves ink transfer and printability. Support resins are typically styrene acrylic polymers with acid functionality that are amine neutrahzed. 

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