Acrylics coalescence coatings

P. H. Fitzgerald, N. O. Wolf, C. R. Clark, and D. P. Cords. Emulsion breaking using alkylphenol-polyethylene oxide-acrylate polymer coated coalescer material. Patent US 5156767, 1992. 

Coalescence Coatings. In this type of coating, tiny particles of resin are encapsulated in a soap-like material and then dispersed in water, which acts as a diluent rather than as a tme solvent. This type of blend is known as an emulsion. When the water evaporates, the resin particles fuse (coalesce) to form a stable, cured coating film. These coatings, once cured, cannot be redissolved in water, although other organic solvents may dissolve them. These coatings consist of acrylic latex suspensions and epoxy emulsions. 

One of the problems encountered in the entrapment of activated charcoal in a polymer matrix is the blinding-off of the pores of the charcoal, thus inactivating it. Because the pores of the carbon are responsible for its ability to adsorb organics, any pores that are filled or coated with a polymer matrix reduce its effectiveness. Conventional treatments involve blending the carbon into an acrylic latex and then applying the slurry to a reticulated foam. Upon drying, a coalescence encapsulates the carbon. 

Many epoxy dispersions are compatible with most types of latex emulsions including acrylic, urethane, styrene butadiene, vinyl chloride, and polyvinyl acetate. The epoxy dispersion can be used as a modifier for these emulsions to alter handling and application characteristics such as emulsion rheology, foaming tendencies, pH sensitivity, wetting properties, and coating coalescence. They can also be reacted into the latex resin either by reacting the epoxy with a functionalized latex or by use of an epoxy with a coreactant. In this way adhesive systems can be formulated that are cured at room or elevated temperatures. 

When acrylic polymers are added into a cement mortar mix, their spheres coalesce to form a continuous polymer matrix which coats the hydrating cement grains and aggregate. This polymer matrix acts as a barrier which helps to improve the hydration of the cement and also provides a polymeric network which increases the toughness and durability of the finished product. 

Uses Coalescing agent tor surface coatings solvent tor acrylic and vinyl acetate copolymers plasticizer presenrative effective against a variety of microorganisms... 

Precaution Combustible liq. and vapor peroxide former Hazardous Decanp. Prods. CO, CO2 heated to decomp., emits acrid smoke and initating fumes NFPA Health 1, Flammability 2, Reactivity 0 Uses Solvent for resins and high-solids coatings (NC, butyrate, ethyl cellulose, acrylic), cosmetics coalescing aid forwater-disp. coatings in food-pkg. adhesives Reffldatay FDA 21CFR 175.105... 

Uses Coupling solvent for sol n. and water-dllutable coatings active solvent for NC, acrylic copolymers, epoxy resins, chlorinated rubber, alkyd resins coalescing aid in architectural latex coatings, floor polishes diluent in hydraulic brake fluids household and general industrial cleaners... 

Uses Plasticizer, flame retardant for plastics incl. acrylics, ceiiuiosics, epoxy, nitrile, phenolic, thermoset po ester, PP, PS, PVAc, PVC, clear vinyl films, vinyl-coated fabrics, flexible PU foam, syn. rubber, wire/ cable insulation, plastisols plasticizer, coalescing agent for coatings Manuf./Dlstrlb. Akzo Nobel FMC Rhodia/Phosphorus Perf. Derivs. Trade Names Antiblaze 519... 

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