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Topic: Polyvinyl acetate

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	Hot and cold water redispersible polyvinyl acetate adhesives - Patent 4251400
		Polyvinyl acetate emulsions are commonly used in making multi-purpose adhesives; that is, adhesives which can be used to adhere such substrates as wood, paper, cloth, plastic and the like.
		Briefly stated, the present invention comprises an aqueous emulsion of a polyvinyl acetate, an anti-coalescing agent consisting essentially of polyvinylpyrrolidone in an amount sufficient to prevent irreversible coalescence of the polyvinyl acetate, and non-volatile, water-soluble plasticizer for the anti-coalescing agent that is immiscible with the polyvinyl acetate.
		The proportion of polyvinyl acetate to polyvinylpyrrolidone anti-coalescing agent is critical in that there must be at least an amount of anti-coalescing agent present to prevent irreversible coalescence of the polyvinyl acetate under hot and cold water washing.
	www.freepatentsonline.com /4251400.html (2468 words)

	Polyvinyl acetate latex impregnated towelette - Patent 4343403
		Polyvinyl alochols having a degree of hydrolysis above 99% are designated as "super hydrolyzed." Films produced from polyvinyl alcohol grades being a degree of hydrolysis above about 95% are resistant to attack by cold water; the extent of water resistance increasing directly with increase in the degree of hydrolysis.
		The emulsion is prepared by emulsion polymerization of vinyl acetate alone or with ethylene at pressures substantially greater than atmospheric in the presence of 1 to 10 parts by weight polyvinyl alcohol, preferably 2 to 6 parts by weight, per 100 parts of emulsion as a protective colloid to stabilize the emulsion.
		The polyvinyl alcohol or mixture of such polyvinyl alcohols is of the cold water soluble or at least cold water dispersible type of being less than 99% hydrolyzed, preferably 80-90% hydrolyzed polyvinyl acetate, and having a low to medium viscosity (4 to 30 cps.).
	www.freepatentsonline.com /4343403.html (2686 words)

	EPA: Federal Register: Kuraray America, Inc.; Pesticide Tolerance Petition Filing
		Polyvinyl acetate, carboxyl-modified, sodium salt is not manufactured or imported from monomers and/or other reactants that are not already included on the TSCA Chemical Substance Inventory.
		Polyvinyl acetate, carboxyl-modified, sodium salt is not a water- absorbing polymer, and therefore is not excluded from eligibility for the amended TSCA exemption.
		In the case of the polyvinyl acetate, carboxyl-modified, sodium salt, the lack of expected toxicity of this substances based on its conformance to the definition of polymers as given in 40 CFR 723.250(b), as well as the criteria that identify low risk polymers, results in no expected cumulative effects.
	www.epa.gov /fedrgstr/EPA-PEST/1999/January/Day-20/p1251.htm (2304 words)

	Polyvinyl Alcohol (01/02S5) (Site not responding. Last check: 2007-11-05)
		In general, fully hydrolyzed grades of polyvinyl alcohol are used mainly in paper coating, in textile warp sizing of hydrophilic fibers, such as cotton and rayon staple yarns, and in laminating film in safety glass (after conversion to polyvinyl butyral).
		Polyvinyl butyral, a derivative of polyvinyl alcohol, is a pliable, tough thermoplastic used as the interlayer in laminated safety glass.
		Polyvinyl acetate, in turn, is produced by free-radical polymerization of vinyl acetate monomer.
	www.chemsystems.com /newsletters/perp/Dec02_N01S5.cfm (937 words)

	alcohol polyvinyl polyvinyl alcohol sodium borate alcohol polyvinyl (Site not responding. Last check: 2007-11-05)
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		The control acetate alcoholysis to develop and with polyvinyl a reinforcement for aa material separation agent synthetic family high resin history of polyvinyl demonstration star branched liquid read of polymer that is polymer by shakambari polyvinyl of thermoplastic hose chemical middot emulsions erh.
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	alcohol-polyvinyl.wow-words.com (563 words)

	Erosion Control with QEI Atlas SoilLok™
		Polyvinyl acetate is a "liquid crust" that strengthens the surface of the soil.
		Polyvinyl acetate was applied on slopes in Malaysia along the Puchong — Shah Highway Interchange to demonstrate the stabilization and germination characteristics of polyvinyl acetate.
		A second slope was used to demonstrate the ability of a polyvinyl acetate dispersion to germinate seeds on rocky, barren soil on severe slopes.
	www.kiwipower.com /QEI_Atlas_article.html (2320 words)

	Highbeam Encyclopedia - Search Results for polyvinyl (Site not responding. Last check: 2007-11-05)
		polyvinyl chloride (PVC) White, tough, solid thermoplastic that is a polymer of vinyl chloride.
		Vinyl plastics are polymers and copolymers of vinyl derivatives (i.e., derivatives of ethylene, H 2 C[symbol]CH 2), e.g., vinyl chloride (H 2 C=CHCl) and vinyl acetate (H 2...
		Polyvinyl chloride demand in the US is forecast to increase 3.4 percent per year to 14.4 billion pounds in the year 2002, valued at $6.2 billion.
	www.encyclopedia.com /SearchResults.aspx?Q=polyvinyl (636 words)

	Vinyl Summary
		Polyethylene, polystyrene, polypropylene, polymethyl methacrylate, polytetrafluoroethylene, polyvinyl chloride, polyvinyl acetate, polyvinylidene chloride, polyvinyl alcohol, polyvinylacetals, polyvinyl fluoride, polyvinyl pyrrolidone, polyvinylcarbazole, and polyvinyl ethers are all examples of compounds referred to generically as vinyl polymers.
		Polyvinyl acetate (PVAc) is made by polymerization of vinyl acetate.
		Polyvinyl alcohol (PVA) is produced by hydrolysis of polyvinyl acetate.
	www.bookrags.com /Vinyl (1132 words)

	Patent 6,066,334
		The present invention relates to the use of redispersible polymer powders or polymer granules consisting of polyvinyl acetate and N-vinylpyrrolidone-containing polymers as binders for producing solid pharmaceutical presentations.
		Polyvinyl acetate is insoluble in water and has not to date been described as binder.
		The shear stability of the polyvinyl acetate dispersion is of crucial importance.
	www.pharmcast.com /Patents/052300OG/6066334_Redispersable052300.htm (2019 words)

	POLYVINYL ALCOHOL (JECFA 52, 2004)
		Polyvinyl alcohol is a synthetic resin that is prepared by polymerization of vinyl acetate, followed by partial hydrolysis of the resulting ester in the presence of an alkaline catalyst.
		Polyvinyl alcohol was also found in the lumens of blood vessels associated with a number of organs, occluding smaller vessels, in particular the capillaries of the lungs associated with endothelial degeneration.
		Polyvinyl alcohol is intended to be used as a moisture-barrier coating in food supplement tablets or in traditional food products, for example, dried fruits to be included in breakfast cereals or nuts to be included in yoghurt.
	www.inchem.org /documents/jecfa/jecmono/v52je09.htm (5878 words)

	Polyvinyl Acetate (PVAc)(Vinyl Acetate Homopolymer) Market Study Report - European Adhesives Industry
		Polyvinyl acetate (PVAc)(Vinyl Acetate Homopolymer) includes polymers of all molecular weights formed from the free radical polymerization of vinyl acetate monomer.
		The spray dried polyvinyl acetate emulsions can be reconstituted in water, mixed with other adhesive emulsions or mixed with other dry ingredients where they have the ability to be used as a binder in dry mix formulations.
		The PVAc emulsions are, by far, the major form in which polyvinyl acetate is used in the adhesive market.
	www.chemquest.com /store/polyvinyl-acetate-european-adhesives.html (528 words)

	Vinyl Acetate (IARC Summary & Evaluation, Volume 63, 1995)
		Vinyl acetate is used in the production of a wide range of polymers, including polyvinyl acetate, polyvinyl alcohol, polyvinyl acetals, ethylene-vinyl acetate copolymers and polyvinyl chloride-vinyl acetate copolymers, which are widely used in the production of adhesives, paints and food packaging.
		Vinyl acetate is rapidly metabolized by esterases in human blood and animal tissues to acetaldehyde and acetic acid.
		Oral administration of vinyl acetate to rats during pregnancy did not result in maternal or developmental toxicity, whereas exposure by inhalation induced maternal toxicity, retarded embryonic growth and minor skeletal alterations at the highest dose tested.
	www.inchem.org /documents/iarc/vol63/vinyl-acetate.html (550 words)

	Notebook (Site not responding. Last check: 2007-11-05)
		Polyvinyl acetate resin already dissolved in acetone to a syrup consistency is sold under the name of Vinylseal [Union Carbide Corp.] and has the same properties as the solution produced from the solid resin.
		The chief advantage of the polyvinyl chloride acetate resin solution is said to be its resistance to the effects of weather.
		Water emulsions of polyvinyl acetate are prepared by dissolving the resin in one of the solvents previously mentioned and combining it with water, using as an emulsifying agent such materials as sodium lauryl sulfate or ammonium oleate.
	www.noteaccess.com /MATERIALS/VinylResins.htm (474 words)

	White School Glue Contains a Suspect Carcinogen
		The reason for the withdrawal is that the principal component of the glue, polyvinyl acetate (PVA), is contaminated with the monomer vinyl acetate.
		Studies indicating that vinyl acetate is a mutagen and carcinogen are worrisome for growing children.
		Because the current levels of contamination of PVA-based glues with vinyl acetate are high, CSA recommends not using polyvinyl acetate glues as currently formulated until the issue of the toxicity of vinyl acetate is resolved.
	www.chicagoartistsresource.org /?q=book/print/14987 (1036 words)

	Borax and Glue Slime
		---------------------------------------------------------- The crosslinking with Elmer's Glue is primarily with the polyvinyl alcohol.
		The polymers is Elmer's Glue may be a copolymer of polyvinyl alcohol and polyvinyl acetate, in which case the co-monomer polyvinyl alcohol can participate in the crosslinking with borax.
		In addition, polyvinyl acetate reacts with water (slowly) producing acetic acid and a hydroxyl group remaining in the polymer backbone, especially if the Elmer's Glue is old.
	www.newton.dep.anl.gov /askasci/chem03/chem03759.htm (265 words)

	Notebook (Site not responding. Last check: 2007-11-05)
		The artist should be aware that these white glue products, satisfactory as they are as adhesives in the home and industrial workshops, are not the most appropriate grades of polyvinyl acetate emulsion for use in paint binders for artists' colors.
		Since the mid-1950s, co-polymerized polyvinyl acetate emulsions, some combined with acrylic resins, have been developed that are said to be more flexible than the older systems of polyvinyl acetate.
		The liquid polyvinyl acetate [PVA] emulsion is milky white, but it becomes clear when it dries.
	www.noteaccess.com /MATERIALS/PolyvinylAcetateE.htm (449 words)

	ATSDR - Public Health Statement: Vinyl Acetate
		People who were exposed to vinyl acetate in air for short periods complained of irritation to their eyes, nose, and throat.
		Vinyl acetate at levels around 200 ppm caused irritation to the respiratory tract and nose when it was breathed by rats and mice for up to 2 years.
		Because vinyl acetate breaks down very quickly to substances that are normally found in your body, measurements of these breakdown products are not useful for showing whether you have been exposed to vinyl acetate.
	www.atsdr.cdc.gov /toxprofiles/phs59.html (2019 words)

	PVA ( polyvinyl acetate ), how pva is used in DIY
		(polyvinyl acetate) before, this emulsion has hundreds of uses and is readily available in most DIY shops or builders merchants.
		PVA (polyvinyl acetate) is good for bonding paper, wood, leather, expanded polystyrene and most other porous materials to each other.
		PVA (polyvinyl acetate) diluted 3 or 4 to 1 can be used as a priming agent.
	www.ultimatehandyman.co.uk /pva.htm (468 words)

	Vinyl acetate (Site not responding. Last check: 2007-11-05)
		Polyvinyl acetate and copolymers of vinyl acetate with acrylate esters and higher vinyl esters are extensively used in the manufacture of paints, adhesives and textile treatments.
		Hydrolysis of polyvinyl acetate and the copolymers of ethylene and vinyl acetate monomer yield vinyl alcohols.
		Polyvinyl alcohol is water-soluble and is used in applications including the stabilization of aqueous dispersions, textile and paper sizing and in the preparation of fibres.
	www.bp.com /sectiongenericarticle.do?categoryId=9002479&contentId=7005050 (264 words)

	Vinyl acetate \| Technology Transfer Network Air Toxics Web site \| US EPA
		Acute animal tests in rats, mice, and rabbits have demonstrated vinyl acetate to have moderate acute toxicity by inhalation, oral, or dermal exposure.
		In rats exposed to vinyl acetate in drinking water, an increased tumor incidence (including neoplastic nodules of the liver, adenocarcinomas of the uterus [in females], and C-cell adenomas or carcinomas of the thyroid) was reported.
		Vinyl acetate has a sweet, pleasant, fruity odor in small quantities, but may be sharp and irritating at higher levels; the odor threshold is 0.5 parts per million (ppm).
	www.epa.gov /ttn/atw/hlthef/vinylace.html (1263 words)

	polyvinyl - Research the news about polyvinyl - from HighBeam Research
		PVAC-E. Since the microparticles of the polyvinyl acetate were well dispersed in the asphalt...
		A conductive polyvinyl alcohol fiber comprising a polyvinyl alcohol polymer and copper sulfide nano-particles was...
		Biomedical Materials; Sep 1, 1992; 147 Words Polyvinyl alcohol (PVA) and heparin-PVA present a heterogeneous and complex substrate for interaction with proteins, consider the authors of this study.
	www.highbeam.com /search.aspx?q=polyvinyl&ref_id=ency_botnm (1051 words)

	Polyvinyl Acetate (PVAc)-(Vinyl Acetate Homopolymer)Market Study Report - U.S. Adhesives Industry
		Polyvinyl acetate (PVAc) (Vinyl Acetate Homopolymer) includes polymers of all molecular weights formed from the free radical polymerization of vinyl acetate monomer.
		Alternative systems, such as vinyl acetate/acrylic copolymers and/or vinyl acetate ethylene coplymers (VAE), limit the growth of PVAc in applications requiring properties such as moderate water resistance, flexibility, low temperature adhesion, or specific adhesion to non-porous surfaces, e.g., vinyl or aluminum.
		This resin classification market report on polyvinyl acetate (PVAc) (vinyl acetate homopolymer)estimates 2003 demand with a historical perspective back to 2000 as well as forecasts through 2005 and 2010 within the U.S. Adhesives Industry.
	www.chemquest.com /store/polyvinyl-acetate-us-adhesives.html (554 words)

	Spectrum Laboratories : Chemical Fact Sheet - Cas # 108054
		60% FOR POLYVINYL ACETATE EMULSIONS AND RESINS; 15% FOR
		POLYVINYL BUTYRAL; 3% FOR ETHYLENE-VINYL ACETATE RESINS AND
		Vinyl acetate is primarily released to the environment from industrial emissions.
	www.speclab.com /compound/c108054.htm (710 words)

	Polyvinyl acetate
		He found that the catalysed reaction of acetylene with acetic acid gave a readily polymerised low boiling liquid (vinyl acetate) to yield a potential range of dense solid materials.
		PVA is not an ideal moulding plastic so the development of many economic and attractive alternatives rapidly ensued based on the ability of vinyl acetate to co-polymerise with many other monomers.
		Hydrolysed versions of PVA gave polyvinyl alcohol as a water-soluble coating and binder.
	www.plastiquarian.com /pva.htm (215 words)

	Adhesives and Consolidants
		Polyvinyl acetate (PVA) is the most commonly used thermoplastic polymer resin for organic material recovered from archaeological excavations (UNESCO 1968; Ashley-Smith 1983b).
		Low and medium acetate grades with viscosities of 2 to 6 are most commonly used in conservation.
		The high acetate grades of PVAl are soluble in cold water, but the low and medium grades must be dissolved in water heated to 40-50°C. It is particularly useful when more than one consolidant is required on the same object.
	nautarch.tamu.edu /class/anth605/File2.htm (2879 words)

	PVA (Polyvinyl Acetate) Beads - Sealant
		PVA (Polyvinyl Acetate) Beads - Sealant (BHI #126591)
		PVA (Polyvinyl Acetate, commonly known as Vinac™ *) is a great high quality preservative coating that can be used in all stages of fossil collecting and preparation.
		We use high-purity, Polyvinyl Acetate Beads (PVA) from McGean Rohco, as a penetrant and coating for fossils in both the field and in the laboratory.
	www.bhigr.com /store/product.php?productid=262&cat=12&bestseller (312 words)

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