Vinyl acetate

About: Vinyl acetate is a research topic. Over the lifetime, 15970 publications have been published within this topic receiving 162142 citations. The topic is also known as: Ethenyl acetate & Ethenyl ethanoate.

Polymer foams containing gas barrier resins

Abstract: An improved closed cell polymer foam and foaming agent involving the use of a halocarbon blowing agent (eg, HCFC-22, HCFC-123, HCFC-123a, and HCFC-141b) in combination with an effective amount of a gas barrier resin (eg, an ethylene/vinyl acetate copolymer, ethylene/acrylic ester copolymer or acrylic ester polymer) uniformly dispersed in the continuous polymeric phase The presence of the gas barrier resin is shown to significantly reduce the escape of blowing agent from and/or entry of air into the foam resulting in low thermal conductivity over a longer period of time and improved thermal insulation value

Clay Intercalation and its Influence on the Morphology and Transport Properties of EVA/Clay Nanocomposites

Abstract: Nanocomposite membranes based on poly-(ethylene-co-vinyl acetate) copolymer (18% vinyl acetate content)and two different organomodified clays have been prepared by mechanical mixing using two roll mill method. The morphology of the nanocomposites was investigated using small angle X-ray scattering, scanning electron microscopy, and transmission electron microscopy. The mechanical and thermal studies were also performed using universal testing machine and differential scanning calorimeter, respectively. Samples with low filler content showed excellent dispersion of layered silicates resulting in a partially exfoliated structure. The diffusion and transport of organic solvents through the membranes have been investigated in detail as a function of clay content, nature of solvent and clay, and temperature in the temperature range of 28−70 °C. The influence of free volume on the transport properties of the membranes was studied using positron annihilation lifetime spectroscopy. The solvent uptake was minimum for composites with 3 wt % of filler, and it get increased with increasing filler content, which is presumably due to aggregation of clay filler at higher loading. The transport phenomenon was found to follow an anomalous mode. Activation parameters were estimated, and the molar mass between cross-links was calculated. Finally, the experimental transport data were compared with theoretical predictions. (Less)

Fluorocarbon vinyl-type esters and polymers

Abstract: The invention includes a polymer of a vinyl or allyl fluorocarbon ester of the formula: Rf.SO2.N(R1)R.COOCH=CH2 or Rf.SO2.N(R1)R.COOCH2CH=CH2 where Rf is a perfluoroalkyl group of 4 to 12 carbon atoms, R1 is hydrogen or an alkyl group of 1 to 6 carbon atoms and R is an alkylene bridging group of 1 to 12 carbon atoms. The vinyl and allyl esters may be bulk, solution, e.g. toluene, or emulsion polymerized using peroxide catalysts, e.g. acetyl or benzoyl peroxides, either alone or together or with other ethylenic monomers such as maleic anhydride, acrylonitrile, vinyl chloride, vinyl acetate, vinyl silicones, styrene, methyl acrylate, methyl methacrylate, ethylene, isoprene and butadiene. The polymer may be modified by the use of plasticizers, carbon black, zinc oxide or by copolymerization with polyfunctional compounds which cause cross-linking. Examples describe the polymerization of N-ethyl- and N-methyl- N-perfluoro-octanesulphonyl glycine vinyl ester and the copolymeriation of N-methyl-N-perfluoro-octanesulphonyl-11-amino-undecanoic acid allyl ester and maleic anhydride. Specifications 758,467 and 857,335 are referred to.ALSO:The invention comprises vinyl and allyl esters of a perfluoroalkanesulphonamido alkylene-monocarboxylic acid having the formula: Rf SO2 N(R1)R-COOCH=CH2 or RfSO2N(R1)R-COOCH2-CH=CH2 where Rf is a perfluoroalkyl group containing 4 to 12 carbon atoms, R is an alkylene bridging group containing 1 to 12 carbon atoms and R1 is hydrogen or an alkyl group containing 1 to 6 carbon atoms. They may be prepared by esterifying the corresponding acid or prepared directly by condensing an alkali metal salt of a perfluoroalkylsulphonamide with a vinyl or alkyl ester of an omega halogenated carboxylic acid. These esters may be polymerised or copolymerised with other ethylenic compounds (see Group IV(a)) to yield a polymer that, when coated on the surface of an article, gives both a water and oil repellent surface. The monomeric esters may be used in a similar manner. In Examples (1) the sodium salt of N-ethyl-perfluoro-octanesulphonamide is condensed with vinyl chloroacetate. (2) the N-methylcompound is similarly used. (3) N-methyl-N-perfluoro-octanesulphonyl-11-amino-undecanoic acid is esterified with vinyl acetate in the presence of sulphuric acid and mercuric acetate. (4) N-perfluoro-octanesulphonyl glycine is esterified with allyl alcohol in the presence of betanaphthalene sulphonic acid. (5) N-methyl-N-perfluoro-octanesulphonyl - 11 - amino - undecanoic acid is similarly esterified. Specifications 758,467 and 857,335 are referred to.

Fabric softening laundry detergent

Abstract: Aqueous laundry detergent compositions containing surfactants and fatty acid, having a pH of from about 6 to about 11 and containing a polymer having a number average molecular weight of from about 700,000 to about 4,000,000 and comprising monomeric units including: nonionic monomers selected from acrylamide, N,N-dialkyl acrylamide, methacrylamide, N,N-dialkylmethacrylamide, hydroxyalkyl acrylate and vinyl pyrrolidone, vinyl acetate, vinyl alcohol, and mixtures thereof; cationic monomers selected from N,N-dialkylaminoalkyl methacrylate, N,N-dialkylaminoalkyl acrylate, N,N-dialkylaminoalkyl acrylamide, N,N-dialkylaminoalkylmethacrylamide, methacylamidoalkyl trialkylammonium chloride, acrylamidoalkylltrialkylammonium chloride, vinylamine, quaternized vinyl imidazole and diallyl dialkyl ammonium chloride, and mixtures thereof; and anionic monomers selected from acrylic acid, methacrylic acid, maleic acid, vinyl sulfonic acid, styrene sulfonic acid, acrylamidopropylmethane sulfonic acid (AMPS), salts thereof, and mixtures thereof; in a specified mole ratio.