Polyvinyl Acetate


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polyvinyl acetate

[¦päl·i′vīn·əl ′as·ə‚tāt]
(organic chemistry)
(H2CCHOOCCH3)x A thermoplastic polymer; insoluble in water, gasoline, oils, and fats, soluble in ketones, alcohols, benzene, esters, and chlorinated hydrocarbons; used in adhesives, films, lacquers, inks, latex paints, and paper sizes. Abbreviated PVA; PVAc.

Polyvinyl Acetate

 

a polymer of vinyl acetate, [—CH2—CH(OCOCH3)—]n. Polyvinyl acetate is a hard, colorless, and nontoxic substance with a molecular weight of 10,000–1,500,000, depending on preparation conditions. It is soluble in many organic solvents but not in gasoline, mineral oils, or water. Polyvinyl acetate softens at low temperatures (26°-28° C) and exhibits cold flow and high adhesion to various materials.

Polyvinyl acetate is produced by the free-radical polymerization of a monomer in a solution, emulsion, or suspension. It is produced in the form of granules (beads), aqueous dispersions, or varnish solutions. Polyvinyl acetate is an intermediate product in the synthesis of polyvinyl alcohol and polyvinyl acetals. It is used in the manufacture of interior and exterior emulsion paint finishes and adhesives for wood, paper, leather, and fabrics.

It is added to concrete to improve its quality and is used in the production of seamless floors and chewing gum.

In the USSR, polyvinyl acetate products are known by various trade names. Alcohol solutions include brands S-4, 8,12,18, and 26 (the numbers indicate the mean viscosity in centipoises). Beads include nos. 15, 25, 50, 75, and 100, and aqueous dispersions are known as NV, SV, and VV. Outside the USSR, aqueous dispersions are primarily produced; trade names include Gelva and Vinylite (USA), Evaflex (Japan), Rhodopas (France), and Alkathene (Great Britain).

World production of polyvinyl acetate in 1973 was about 1 million tons.

REFERENCES

See references under .

E. N. ROSTOVSKII

polyvinyl acetate, PVA

A colorless, thermoplastic, water-insoluble resin; used as a latex binder in certain paints.
References in periodicals archive ?
However, within the cementing material factor, all these variables did not present significant difference between gum arabic and polyvinyl acetate. According to Dode et al.
Riedl, "Effects of adding nano-clay on performance of polyvinyl acetate (PVA) as a wood adhesive," Composites A, vol.
The authors gratefully acknowledge WACKER Polymer systems GmbH & Co., Germany, for providing the polyvinyl acetate for this study.
The amount of phenol adsorbed per gramme of 0.25g of polyvinyl acetate and the time adsorption reaches equilibrium were determined and are as presented in Table 1.
The coating can be polyvinyl acetate, polyvinyl alcohol, polycaprolactone, polyester, polyester amide, proteins, polysaccharides, natural wax or grease, acrylates or even amorphous polylactic acid.
In the "Results" of our article, we specifically noted the use of ortho-phthalates (DBP and DEP), which were often found to be used in combination with the phthalate polymers he discussed in his letter [cellulose acetate phthalate (CAP), hypromellose phthalate (HMP), and polyvinyl acetate phthalate (PVAP)].
The liquid fabric treatment composition is placed in a water soluble container formed from a water soluble polymer selected from the group consisting of polyvinyl alcohols, polyvinyl alcohol copolymers, partially hydrolyzed polyvinyl acetate, polyvinyl pyrrolidone, alkyl celluloses, ethers and esters of alkyl cellulosics, hydroxyl alkyl, carboxy methyl cellulose sodium, dextrin, maltodextrin, water soluble polyacrylates, water soluble polyacry-lamides and acrylic acid/maleic anhydride copolymers.
Advantage 425 is a two-part crosslink polyvinyl acetate emulsion adhesive distinguished for high water resistance, low minimum-use temperature and ease of extrusion.
"The water based emul-sion technology from Air Products nicely complements our established solutions technologies and our more recent UV/EB technologies that came to us through the Northwest Coatings acquisition about a year ago." Boldrini said the acquired operations include both acrylic and polyvinyl acetate tech-nologies supporting Ashland's sales into paper and film labels, adhesives and sealants, pulp and paper, coatings and woodworking industries.
Polyvinyl acetate was produced from solution polymerization of vinyl acetate (VAc) in a batch reactor.
Veneers were prepared from 2-mm and 4-mm-thick black alder and glued using polyvinyl acetate (PVA) and polyurethane (PU) adhesives.
Polyvinyl acetate is a primary application for Resoflex plasticizers.