Polyvinyl acetate copolymers

PVC/PVA copolymer solutions Polyvinyl chloride/polyvinyl acetate copolymers can be readily dissolved in blends of aromatic hydrocarbon,... 

Standard Oil Co. claims the use of polyisobutylene as a plasticizer for polyvinyl acetate. Copolymers of isobutylene with vinyl ethers and other monomers are mentioned in several patents. For synthetic rubbers, oligomers of butadiene are claimed. Rubberlike polyolefins (10 to 50% is sufficient) are used extensively for plasticizing phenolic resins to increase impact strength. 

Polyvinyl acetate and polyvinyl acetate copolymers (EVA, PVAC for low-cost adhesive bonding of plastics to wood, paper, leather, and metals)... 

Typical physical properties of a polyvinyl acetate copolymer emulsion suitable for use with cement are given in Table 3. 

Experimental plan. Table 1 presents the experimental plan of this study. High-strength concrete with 25% W/B and incorporating 20% fly ash (FA) and 10% silica fume (SF) was fabricated. A number of trial mixes were performed to secure 700 mm slump flow and 3. 0% air content. For the polymer resin, ethylene vinyl acetate copolymer (EVA-P) and polyvinyl acetate copolymer (PVA-P) powders and PVA (PVA-F) and polypropylene (PP-F) fibers were applied. The dosages ranged from 0.1% to 0.5% for powder-type resins and from 0.05% to 0.15% for fiber-type polymers. 

Biocides are generally formulated with a carrier into concentrations of 2 to 10% active ingredient. They are available to plastics converters, processors, and other users in powder, hquid, or sohd pellet form. The carrier, as noted previously, is usually a plasticizer, but it can also be a resin concentrate such as PVC/PVA (polyvinyl acetate) copolymer or polystyrene. For example, OBPA, the most common biocide active ingredient, is typically purchased as a dispersion in a plasticizer at a concentration of 2% active ingredient. 

Fig. I. Cumulative separation factors of lanthanides in HCIO4 by HDEHP. Squares extraction chromatography on a polyvinyl chloride/polyvinyl acetate copolymer at 60°C. Circles solvent extraction into toluene at 25. ...

Everflex, Polyvinyl acetate copolymer emulsions, Hampshire Chemical Corp., Subs, of Dow Chemical... 

Acetone and methyl ethyl ketone are components of solvent blends in urethane, nitrile rubber, and neoprene industrial adhesives. Acetone is the primary solvent in resin-type adhesives and pressure sensitive chlorinated rubber adhesives. Methyl isobutyl ketone is a solvent component for nitrile rubber and acrylic adhesives as well as in polyvinyl chloride and polyvinyl chloride-polyvinyl acetate copolymer bonding adhesives. Again, the desired evaporation rate of the adhesive formulation will often determine the ketone selected. 

These techniques have been discussed by Castle and McClure [51] who applied the Perkin Elmer system 2000 TGA-FT-IR interface system to thermal decomposition studies on PVC-polyvinyl acetate copolymers. They identified acetic acid and hydrogen chloride as two of the decomposition products. 

Kirkbright, G.F. and K.R. Menon, The Determination of Combined Vinyl Acetate in Polyvinyl Chloride-Polyvinyl Acetate Copolymer by PAS and NIR. Area/. Chim. Acta, 1982.136 373. 

Effect of Accelerated Agings on Polyvinyl Acetate Copolymers... 

Vinyl Resin VAGH (polyvinyl chloride/polyvinyl acetate copolymer) may be used for a topcoat formulation which is applied over acrylic/vinyl intermediate coats. The carboxyl function VMCH resin is used to promote better adhesion to metal substrates. 

Latex adhesives based primarily on pol5rvinyl acetate and polyvinyl acetate copolymers... 

Scheme 7.19 Synthesis of polystyrene-block-polyvinyl acetate copolymer via using RAFT polymerization in conjunction with CuAAC reaction.

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