Polyvinyl acetate homopolymers

Emulsion Polymerization A typical recipe is give in Table I. Emulsion polymerization was carried out at 60°C under a nitrogen atmosphere using a batch process. Theoretical solids content in all the formulations was 25%, and generally the conversions were better than 98%. A polyvinyl acetate homopolymer and two poly (vinyl acetate-butyl acrylate) copolymers having VA/BA composition of 85/15 and 70/30 were prepared according to the above procedure. 

Polyvinyl acetate homopolymer emulsion. High molecular weight, large particle size resin. May be used with thermosetting resins, starches, softeners, nondurable water repellents and plasticizers. Base for adhesives. T(g) 28C. 

Modified polyvinyl acetate homopolymer emulsion especially reacted to provide hand modification and impart bulk to fibers. 

Polyvinyl acetate homopolymer Polyvinyl acetate homopolymer Polyvinyl acetate homopolymer Polyvinyl acetate homopolymer Polyvinyl acetate homopolymer Polyvinyl alcohol Polyvinyl alcohol Polyvinyl alcohol Polyvinyl alcohol Polyvinyl propionate Polylvinyl pyrrolidone)... 

Typical Properties of a Preferred Polyvinyl Acetate Homopolymer Aqueous Dispersion... 

Polyvinyl acetate homopolymers and copolymers can be used as core washes for sand cores as aqueous dispersions, in organic solvent solutions or mixed with zircon or graphite in aqueous or alcoholic suspensions. Polyvinyl alcohol or partially hydrolyzed polyvinyl alcohol can be used in aqueous solutions, organic solvent dispersions or mixed with zircon or graphite. 

Polymer resin aqueous dispersions and alcoholic solutions 5% by weight to 40% by weight of polymer resin such as polyvinyl acetate homopolymer or copolymer in... 

Chem. Descrip. Polyvinyl acetate homopolymer emulsion CAS 9003-20-7... 

Synonyms Acetic acid, elhenyl ester, homopolymer Acetic acid, vinyl ester, polymer Acetic acid vinyl ester polymers Ethenyl acetate, homopolymer Poly (vinylacetate) Polyvinyl acetate homopolymer Polyvinyl acetate resin PVA PVAc Vinyl acetate homopolymer Vinyl acetate polymer Vinyl acetate resin Classification Homopolymer Definition Homopolymer of vinyl acetate Empirical (C HsOJ,... 

Polyvinyl acetate homopolymer Polyvinyl acetate resin PVA PVAc Vinyl acetate homopolymer... 

Table 1 Typical Grades of Polyvinyl Acetate Homopolymer...

Internally plasticized n. When a product is synthesized from a reaction involving two or more raw materials, it may be said to be internally plasticized if one of the raw materials is able to confer plasticity or flexibility to it. In other words, the product is plasticized because it is build up from a component, which is naturally plastic. For example, an oil-modified alkyd, in which phthalic anhydride and glycerol are combined with drying oil fatty acids, is internally plasticized by reason of the presence of the fatty acid component. If a Congo varnish were made by interaction of run Congo and linseed oil monoglyceride, it could be described as internally plasticized, in contrast to a varnish made by simple dissolution of run Congo in linseed oil, which would be externally plasticized. Also a polyvinyl acetate-acrylic co-polymer is internally plasticized while a polyvinyl acetate homopolymer, into which a plasticizer has been stirred, is externally plasticized. 

Daratak, Polyvinyl acetate homopolymer emulsions, Hampshire Chemical Corp., Subs, of Dow Chemical... 

Polyvinyl acetate resins adhere well to more surfaces than most other adhesive bases. Polyvinyl acetate homopolymers bond particularly well to wood and paper substrates. Copolymers of polyvinyl acetates adhere to, or can be compounded to adhere to, a wide variety of plastic film and metal foils that are frequently laminated or combined with paper and wood. 

Certain properties may best be explained by examining the molecular structure of polyvinyl acetate and some of its copolymers. Fig. 5 compares polyethylene and polyvinyl acetate homopolymers. Polyethylene is, of course, a flexible polymer, whereas polyvinyl acetate homopolymer is hard and brittle because steric hindrance between alternate acetate groups restricts movement of the molecules. A copolymer of vinyl acetate containing 25 weight... 

Copolymer emulsions are flexible and soft because of bulky pendant groups or flexible backbones. Polyvinyl acetate homopolymer emulsions series are hard and stiff due to the steric hindrance of the acetate groups and the strong intermolecular attraction. Any of these emulsion families may be compounded with plasticizers to increase flexibility. 

The general-purpose plasticizers listed in Table 9 can be added to polyvinyl acetate homopolymer and copolymer emulsions. Fire-retardant plasticizers, which are occasionally needed, are also listed. 

Features HIghly-efficlent rec. for use with systems based on styrene acrylics, polyvinyl acetate homopolymers, pure acrylics, vinyl acetate vinyl versalates styrene butadienes and vinyl acrylics... 

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