Polyvinyl Acetate


Also found in: Dictionary, Thesaurus, Medical, Acronyms, Wikipedia.

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 ?
Table 1 shows the variation of the amount of phenol adsorbed by polyvinyl acetate (0.
It can be observed that by increasing the monomer to solvent volume ratio the solvent's radical decreases and the molecular weight of polyvinyl acetate increases.
The second film-forming polymer has a glass transition temperature at least 50[degrees]C higher than the first polymer and polymers of this second type are exemplified by a mixture of acrylates/ hydroxyesters acrylates copolymer and polyvinyl acetate available as Thorco Flex IV G and Thorco Flex-3 from Thomley Company.
Wacker is also working on new developments in its Vinnapas polyvinyl acetate (PVAc) low-shrink/low-profile additives for thermoset polyester molding compounds.
This adhesive is a highly water-resistant, two-part cross-linking polyvinyl acetate adhesive that is specifically designed to pass ASTM D 5751 and ASTM D 5572 adhesive standards on production material, according to the company.
Small clay particles can agglomerate with polyvinyl acetate (PVAc) to form neutral-buoyancy aggregates.
Water-dispersion latex paint on high-quality polyvinyl acetate binder for internal works, white color, Diamant, or equivalent (bucket not more than 15.
Around [euro] 40 million investment at integrated production site in Nanjing; doubling of dispersion capacity to 120,000 metric tons per year; new plant for polyvinyl acetate solid resins.
Polyvinyl acetate (PVAC), which is the largest component in the resin, is semi-permeable to water and oxygen, contributes moderate strength, and is capable of forming strong hydrogen bonds.
One of the newest is Belsil P101, a polysiloxane and polyvinyl acetate material that enables formulators to create hairsprays that provide softness, silky touch and humidity resistance as well as hold and curl retention.