Latexes, coating

Coating speeds in excess of 305 m /min can be attained. The latex coating can be dried in forced-air or radiant-heat ovens (186,187). Multiple coats... 

Scott latex-coated products are designed for high temperature environments and long cycle crops such as commercial ornamental production and specialty agriculture. 

Fig. 2.3.4 Film formation of a photoinitiated the lower surface (left) after a 90 min induction cross-linking latex coating as measured by period due to oxygen absorption. The profiles CARField. (a) The coating is exposed to air shown were recorded 10, 90, 100 and 110 min (evaporation) and light from above, (b) A sam- and 2, 3, 4, 5, 6 and 17 h after casting the layer, pie comprising a combination of only polymer (d)The full formulation film forms in the central and water dries from the upper surface (right) layers first. In this final time series, the profiles as shown by a time series of profiles, recorded shown were recorded after 10 min (dotted at 10, 20, 30, 40, 50, 60, 70, 100 and 120 min trace, T) attenuated) and then, from the top after casting the layer, (c) A combination of down, 30, 60 and 90 min and 2, 3, 6 and 17 h polymer and photoinitiator only cures from after casting the layer.

Figure 3 Gradient separation of anions using suppressed conductivity detection. Column 0.4 x 15 cm AS5A, 5 p latex-coated resin (Dionex). Eluent 750 pM NaOH, 0-5 min., then to 85 mM NaOH in 30 min. Flow 1 ml/min. 1 fluoride, 2 a-hydrox-ybutyrate, 3 acetate, 4 glycolate, 5 butyrate, 6 gluconate, 7 a-hydroxyvalerate, 8 formate, 9 valerate, 10 pyruvate, 11 monochloroacetate, 12 bromate, 13 chloride, 14 galacturonate, 15 nitrite, 16 glucuronate, 17 dichloroacetate, 18 trifluoroacetate, 19 phosphite, 20 selenite, 21 bromide, 22 nitrate, 23 sulfate, 24 oxalate, 25 selenate, 26 a-ketoglutarate, 27 fumarate, 28 phthalate, 29 oxalacetate, 30 phosphate, 31 arsenate, 32 chromate, 33 citrate, 34 isocitrate, 35 ds-aconitate, 36 trans-aconitate. (Reproduced with permission of Elsevier Science from Rocklin, R. D., Pohl, C. A., and Schibler, J. A., /. Chromatogr., 411, 107, 1987.)...

Fig. 6. Comparison of the percentage average weight loss of Dutch Gouda cheeses treated with either a poly(HAMCL) latex coating (solid line, 12 cheeses in total) or a commercial cheese coating (dashed line, 6 cheeses) as a function of time...

It is known(J ) that when hydrophobe-modified W-SPs such as those in Figure 1 are formulated in water-borne latex coatings a significant time period 048 hours) is required to reach steady state viscosities this does not happen when either MC, HPMC, HEC... 

FIGURE I Schematic diagram illustrating the construction of an anion exchange latex coated, surface-sulfonated, nonporous cross-linked polyethylvinylbenzene-divinylbenzene resin bead. 

Figure 5. Percent retention of strength of latex coated 3701 fabric with 3-amlnopropylpolyslloxane coating, after Imnerslon In alkali for 7 days at 80°C., as a function of number of dips In latex, kind of latex, and curing conditions.

That said, the task should not be overcomplicated, and many good instances exist to illustrate successful conclusions to such efforts. For example, the data shown in Table 12 illustrate the scaling-up of the Wurster process in which an aqueous latex coating has been applied to drug-loaded pellets in order to prepare a modified-release product. It is appropriate to point out that since the 32" Wurster essentially comprises three 18" Wurster units, the airflow used in the former represents approximately a threefold increase over that of the latter, with the result that the spray rate is scaled... 

Table 12 Coating Process Conditions Used in the Scaling-Up of the Wurster Process for Application of an Aqueous Latex Coating to Drug Loaded Pellets...

Figure 54.2 Brazilian native preparing dry rubber by smoking latex coated wooden shovel over a pot of burning palm nuts. Turtle shell bowl contains small pool of latex. Source-. Engraving from The Amazon and Madeira Rivers by Franz Keller published by J. B. Lippincott and Company, Philadelphia, 1875. The Library of Congress.

The effectiveness of coalescence of the latex coating The incidences of defects such as pick marks or cracks ... 

Poly(vinylidene chloride-co-acrylonitrile) is widely used as a latex coating for cellophane, polyethylene and paper. Since this copolymer is soluble in organic solvents, it is also used as a solution coating. Tile resistance to vapor permeability and the ease of printing on polyethylene and cellophane is increased by coating with this vinylidene chloride copolymer. 

WATER SOLUBLE POLYMERS. Water-soluble polymers find application in a wide variety of areas that include polymers as food sources, plasma substitutes, and as diluents in medical prescriptions. Other areas of importance for water-soluble polymers include detergents, cosmetics, sewage treatment, stabilizing agents in the production of commodity plashes, rheology modifiers in the various processes for petroleum, textile, paper, and latex coatings production. The water-soluble polymers discussed in this article have significant commercial impact. 

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