Coatings emulsion

A number of chemical products are derived from Sasol s synthetic fuel operations based on the Fischer-Tropsch synthesis including paraffin waxes from the Arge process and several polar and nonpolar hydrocarbon mixtures from the Synthol process. Products suitable for use as hot melt adhesives, PVC lubricants, cormgated cardboard coating emulsions, and poHshes have been developed from Arge waxes. Wax blends containing medium and hard wax fractions are useful for making candles, and over 20,000 t/yr of wax are sold for this appHcation. 

Other polymers used in the PSA industry include synthetic polyisoprenes and polybutadienes, styrene-butadiene rubbers, butadiene-acrylonitrile rubbers, polychloroprenes, and some polyisobutylenes. With the exception of pure polyisobutylenes, these polymer backbones retain some unsaturation, which makes them susceptible to oxidation and UV degradation. The rubbers require compounding with tackifiers and, if desired, plasticizers or oils to make them tacky. To improve performance and to make them more processible, diene-based polymers are typically compounded with additional stabilizers, chemical crosslinkers, and solvents for coating. Emulsion polymerized styrene butadiene rubbers (SBRs) are a common basis for PSA formulation [121]. The tackified SBR PSAs show improved cohesive strength as the Mooney viscosity and percent bound styrene in the rubber increases. The peel performance typically is best with 24—40% bound styrene in the rubber. To increase adhesion to polar surfaces, carboxylated SBRs have been used for PSA formulation. Blends of SBR and natural rubber are commonly used to improve long-term stability of the adhesives. 

Low-molecular weight HDPE—spray coatings, emulsions, prinking inks, wax polishes, and crayons... 

Coatings emulsions are generally formed by addition polymerization of common, highly available monomers, using free radical initiators to create polymers having molecular weights from a few thousand up to millions. The polymerization is most often stabilized by non-ionic and/or anionic surfactants, which emulsify the insoluble monomer droplets, and then stabilize the resulting particles, usually in the shape of a sphere. In addition to surfactants, emulsions are sometimes stabilized with water-soluble poly-... 

Chromium oxide is equally important as a colorant and in its other industrial applications. As a pigment, it is used predominantly in the paint and coatings industry for high quality green paints with special requirements, especially for steel constructions (coil coating), facade coatings (emulsion paints), and automotive coatings. 

Several types of chemical sensitization can be identified in practice by the procedures used to obtain them in the manufacture of the emulsions and by their photographic consequences. The sensitivity of some emulsions can be increased further by treating the finished, coated emulsion with a sensitizing gas or solution. This process is termed hypersensitization. 

Loss of photoelectrons and silver atoms to oxygen and moisture can be studied by the vacuum outgassing methods already described. The use of thinly coated emulsion layers is preferred. In the monodisperse fine-grain emulsions, loss to mobile... 

Steric stabilization appears to be the dominant stabilizing force in most food colloids [78,824], Casein-coated emulsion droplets provide an example. The presence of protein in an adsorption layer can also contribute viscoelasticity and provide a barrier to coalescence. 

CMC can be used in a variety of products such as detergents, foods (as protective colloid and for purposes where high water-binding capacity is required, stabilizers, etc.), ice cream, paper coatings, emulsion paints, drilling fluids, ceramics, pharmaceuticals, and cosmetics. 

The contact angles previously observed with flocculated oil droplets in saline emulsions are found to result from thin films of a middle phase which coats emulsion droplets and fills the planes of contact between droplets. 

A small but growing market is polyvinyl acetate paper coating emulsions. These are used to produce high quality packaging materials. 

C. R. Manens, Waterborne Coatings — Emulsion and Water-Soluble Pairtts, Van Nostrand Reiidiold, New York, 1981... 

It is possible to calculate from statistical mechanical principles the approximate conformations of the adsorbed caseins, by assuming that they are flexible, and composed of chains of hydrophilic and hydrophobic amino acids (91). The calculations of these model systems show many of the features of the actual measured properties, especially the tendency of the adsorbed 6-casein to protrude further from the inter face than the Ogj-casein (92). These calculations have in turn been used to explain the differing stability of the two different types of emulsions (93). These calculations have considerable success in explaining both the structure and stability of casein-coated emulsions, but are less adaptable to explain the behavior of more rigid protein surfactants. However, the same principles have been used to explain the apparently anomalous adsorption of phosvitin (16). 

Uses Additive in coatings, emulsions, slip resist, floor polishes, hot melt applies., polymers, adhesives dispersant for pigments, minerals, and glass-filled plastics, compatibilizers, and adhesion promoters Features Provides reactivity in hot melt applies. 

Uses Defoamer for aq. systems, architectural coatings, emulsion plasters, building prods., industrial and wood coatings, automotive coatings, printing inks, adhesives Features Wide formulation latitude... 

Uses Defoamer for latex and emulsion architectural paints, general industrial, can coatings, emulsion polymers, syn. renderings, food pkg. adhesives/paper, dispersions, coating colors in paper prod, (self-copying paper, folding boxboard)... 

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