Latexes, applications

Latex applications include adhesives, fibre binders (such as in paper and textiles), coatings (such as in paints, coated papers, coated fabrics, coated flooring, and coated insulation), dipping-produced goods (such as balloons, bladders, gloves, and tubing), solid foam products (such as for cushioned furniture), and as a constituent in building materials (such as mortars and concrete) [791]. 

Anderson, C.D. Daniels, E.S. Emulsion Polymerization and Latex Applications, Rapra Technology Ltd. Shawbury, UK, Rapra Review Report Vol. 14, No. 4, 2003,146 pp. 

Acrylic acid derivatives treated with heparin are used to coat surfaces of clinical equipment. Acrylic acid is also used as a copolymer component in aerosol hair spray, in plastics, in molding powder for signs, in paint formulations, in leather finishing, in paper coatings, and in latex applications to prevent premature coagulation. It is also used in the production of hydrogels used for contact lenses. 

Recommended for products adhesive, sealant, latex applications ... 

In many applications, latexes are spread on substrates as coatings for protective purposes. In many latex applications (such as latex paints and industrial coatings), the formation of a cohesive film is the ultimate goal. In such cases, film formation takes place within several days. 

RhGOlogy. Flow properties of latices are important during processing and in many latex applications such as dipped goods, paint, and fabric coatings. Rheology is used to characterize the stability of latices (45). For dilute, nonionic latices, the relative latex viscosity is a power-law expansion of the particle volume fraction. The terms in the expansion account for flow aroimd the particles and particle-particle interactions. For ionic latices, electrostatic contributions to the flow around the diffuse double layer and enhanced particle-particle interactions must be considered (46). A relative viscosity relationship for concentrated latices was first presented in 1972 (47). A review of empirical relative viscosity models is available (46). In practice, latex viscosity measurements are carried out with rotational viscometers (see Rheological Measurements). 

Table 12. Effect of Thermal Treatment and Latex Application on Polypropylene Multifilaments ...

A third monomer may occasionally be used in a small quantity. For example a small quantity of styrene may be incorporated to improve the flow properties but this usually at the expense of the most desirable properties of the nitrile rubber. Incorporation of methacrylic acid produces very reactive polymers (carboxylated nitriles) which may be cross-linked by metal oxides. The use of such materials is largely confined to latex applications. 

A liquid sulfur synergist for phenolic antioxidants, recommended for ABS and SBR latex applications. 

Lee, D. I., Latex Applications in Paper Coating, NATO ASI Series- Vol. 335, Kluwer Academic, Netherlands, 1997. 

Soluble Fluoropol)miers -[cf2-t F2] . -[C ]J"> 305 - - Latex Application Methods... 

The major use of vulcanizing latex adhesives is in the manufacture of textiles, rugs and carpets, and closely allied products such as rubberized hair. As in many other latex applications, ultraaccelerators are used to effect vulcanization. The materials used must be stable in alkaline dispersions, although they need not be active, since if the alkali is ammonia it will normally be removed early in the drying/vulcanization process. The vulcanization ingredients, sulfur, zinc oxide, and the insoluble accelerators must be added as dispersions in water, and these are conveniently prepared at 50% solids and stabilized by an anionic surfactant. Such dispersions may be made by ball-milling or may be easily purchased premade from specialist suppliers. Soluble accelerators can be added as solutions directly to stabilized latex, but the solutions have a much more limited life than do dispersions. 

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