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 ?
Embedded in those simple instructions are some nonobvious technical issues that make polyurethane glue different from white or yellow glues, which are classified as polyvinyl acetates, or PVA glues. PVA glues, which include the white glue used in classrooms and waterproof formulas such as Titebond III Ultimate Wood Glue, cure by dehydration.
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