Ageing acrylic dispersion

Among binders, styrene-butadiene latexes dominate beside modified starches. Styrene-acrylate dispersions are spedalties and of high importance for impressive prints. Additionally acrylate dispersions have an excellent brightness and ageing resistance and are less odorous. Future requirements of coating process conditions, on paper characteristics and printing technologies forced the production of tailor-made binders with very specific property profiles. 

Uses Acrylic dispersant for flat and gloss latex paints Features Extremely efficient at low levels of use as the sole dispersant versatile an compat, with reactive pigments demonstrates vise, stability when aged reduces foaming and problems relating to water resistance Properties Cl, pale iiq, readily sol. in water, glycols dens. 10.2-10.4 lbs./gal. pH 7.8 35% act,... 

Gutierrez-Rocca, J.C. McGinity, J.W. Influence of aging on the physical-mechanical properties of acrylic resin films cast from aqueous dispersions and organic solutions. Drug Dev. Ind. Pharm. 1993, 19 (3), 315-332. 

Primal [Rohm Haas]. TM for aqueous dispersions of acrylic resins, supplied in various grades that differ in hardness and flexibility and produce finishes that are water insoluble, require no plasticizer for flexibility, are unimpaired by aging, and adhere tenaciously to leather and lacquer coats. 

The addition of styrene-acrylate causes a significant increase in the bending tensile strength (Fig.2). An increase from 7.4 MPa to 11.7 MPa at the age of 28 days can be observed. This value is reached with the 10% as well as the 20% dosage. Adding styrene-butadiene does not result in a considerable increase in the flexural strength, which is in compliance with the conclusion that not all of the polymer modifications bring about the desired properties. The required properties of the modified mortar are dependent up on the used dispersion and the composition. However, this can only be determined from experiments. 

Uses Conosion inhibitor for metal finishing coalings emulsifier, and dispersant for aq. emulsion polymers including styrene acrylic, vinyl veova, S/B, VA, EVA, acidizing fiuids, vehicle cleaners, hard-surf, cleaners Features Darkens with age... 

Uses Dispersant tor flat thru gloss acrylic and vinyl acrylic architectural coatings Features Low cost, nontbaming, water-sol. provides good heat-age and shelf stability, good color acceptance, low color... 

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