Drying PVAC films

The PVAc latex containing PVA as a protective colloid prepared in method [III] using the HPO (0.12%)-TA (0,10%) system as an initiator in Table 1 was cast to about 1.8 mm in thickness on a poly(ethylene) plate and dried at room temperature. The dried latex films were 0.7-0.9 mm in thickness and were semi-transparent. The porous film after acetone extraction changed to a white color without a change in the film size. 

There has been a conventional sense that the PVAc latexes prepared in the presence of PVA as a protective colloid contain the graft copolymer of PVA and PVAc, so that PVAc particles in the dried latex film are not extracted at a high ratio with solvents. In this Chapter, it has been defined without an influence by the usual sense that the porous PVA-PVAc composite can be prepared from the PVAc latex film with acetone extraction. The porous film consists of the spherical cells of PVA... 

From the electron micrographs, assuming that PVAc particles in the latex are the same size, the formation model of the porous film from the latex film can be illustrated as in Fig. 3 [19]. When the latex forms a dried film over minimum film-forming temperature, it is concluded that PVA coexisted in the latex and is not excluded to the outside of the film during filming, but is kept in spaces produced by the close-packed structure of PVAc particles. 

Uses Dedusting agent for dry cleaning detergent, alkaline powders, water-repellent fabric finishes emulsion polymerization of PVAc and acrylic films... 

Chem. Descrip. Nonoxynol-6 phosphate CAS 68412-53-3 EINECS/EEINCS 249-992-9 Uses Detergent for dry cleaning, waterless hand cleaners intermediate for textile lubricants emulsifier for emulsion polymerization (PVAc and acrylic films) emulsifier, dispersant for agric. formulations, paints corrosion inhibitor for metal treatment Features Good electrolyte tolerance... 

Uses Plasticizer for polyvinyl and cellulosic resins inch NC lacquers and films, PVC flooring/plastisols, PVAc adhesives/sealants/caulks, acrylic coatings, chlorinated rubber, cellulose propionate, polyamide, castable PU organic intermediate film-former, plasticizer in cosmetics plasticizer in food-contact polymers in food-pkg. adhesives in paper/pa-perboard in contact with aq./fatty/dry foods solvent for adjuvants in food-contact crosslinked polyesters Features High-solvating... 

Figure 7.3.14. An example of FT-IR spectra of drying film. The methanol bands disappear slowly while the polymer bands remain constant. The ratio of the band height contains information on concentration. Methanol contents spectruml 54 g/m, spectrum 19 g/m, spectrumS 3.7 g/m, spectrum4 1.5 g/m, and spectrumS 0 g/m, PVAc content 57 g/m. [Adapted by permission, from Saure, R. and V. Gnielinski, Drying Technol., 12,1427 (1994)].

Uses Emulsifier, wetting agent, plasticizer for industrial applies. plasticizer for wax paper adhesives solvent for PVAc thickener for PVAc emulsions coalescing agent for resin particles in air-drying of resin film Properties Pale yel. liq. sol. in water, ether, alcohol, ketone, lower aliphatic ester, and aromatic hydrocarbon solv. sp.gr. 1.1 vise. = 50 cps HLB14 acid no. 2 max. flash pt. > 300 F ref. index 1.502 pH 4-6 (50% aq.)... 

Chem. Descrip. Phosphated nonylphenol ethoxylate Uses Film-former in metalworking applies. surfactant for dry cleaning, PVAc emui-sion polymerization, heavy-duty cleaners, textiles (water repellent finishes) Features Reacts readily with alkalinity sources, making it easily incorporated into water-based fluids when exposed to temps, common in metal-forming operations, its f Im-forming props, reduce heat and improve tool life Properties Yel. si. hazy liq. sp.gr. 1.108 vise. 13,200 cp pH 2.16 (10%) 2.8% P Use Level 1-15%... 

Uses Lubricant antlstat emulsifier for cutting fluids, PVAc, and acrylic film formation detergent for hard surfaces, metal cleaners, and dry cleaning systems waterless hand cleaner component personal care formulations... 

Hazardous Decomp. Prods. Heated to decomp., emits acrid smoke and fumes Uses Plasticizer for cellulosics, PVC, plastisols, PS, PVB, PVAc adhesives, VGA, castable PU latex and lacquer coating applies. film-former, surf, wetting agent in PVAc homopolymer emulsion adhesives emollient in cosmetics plasticizer for PVAc coatings for food-contact paper/paperboard plasticizer for polymers in paper/paperboard in contact with dry food in food-pkg. adhesives Regulatory FDA21CFR 175.105,176.170... 

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