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.

Poly(vinyl acetate), poly((1-O-(vinyloxy) ethyl-2,3,4,6-tetra-O-acetyl-β-d-glucopyranoside) and amorphous poly(lactic acid) are the most CO2-soluble oxygenated hydrocarbon-based polymers

Abstract: Poly(vinyl acetate), PVAc, remains the most CO 2 -soluble non-fluorous polymer identified to date. Small sugar acetates are known to be extraordinarily CO 2 -philic, but cellulose triacetate, a crystalline high molecule weight polymer is CO 2 insoluble. Therefore, an amorphous high molecular weight polymer with pendant sugar acetates was synthesized. This polymer, poly(1- O -(vinyloxy) ethyl-2,3,4,6-tetra- O -acetyl-β- d -glucopyranoside, P(AcGIcVE), was indeed CO 2 -soluble, however cloud point pressures of P(AcGIcVE) at 5 wt% polymer and 298 K were greater than that required for the dissolution of PVAc. Finally, the solubility of amorphous poly(lactic acid), PLA, was determined over a wide range of molecular weight. The corresponding cloud point pressures were much greater than either PVAc or P(AcGIcVE). Ab initio calculations for the CO 2 /PVAc dimer and CO 2 /PLA dimer mixtures were conducted in an attempt to elucidate the dramatic differences in the cloud point values of PVAc and PLA. Our calculations indicate that there is little difference in the average interaction energies for the CO 2 /PLA and the CO 2 /IPA systems. The only indication that PVAc would be expected to be more CO 2 -soluble that PLA was that the vinyl acetate dimer has binding modes that will readily accept multiple CO 2 molecules, whereas the binding modes for the lactic acid dimer can apparently only accommodate a single CO 2 molecule at a time.

Process for manufacturing potent pour depressants

Abstract: A method of producing copolymers of ethylene and 28 to 60 weight percent vinyl acetate of 2,000 to 6,000 mol weight for use as pour depressants by charging solvent, vinyl acetate and ethylene to a reactor until the concentration of vinyl acetate in said solvent is 6 to 10 weight percent and the pressure is 700 to 2000 p.s.i., heating to 280* to 340* F. and then adding promoter to start the polymerization and thereafter adding additional promoter and vinyl acetate to maintain the concentration of vinyl acetate in the 6 to 10 weight percent range during the course of the reaction.

Ink jet printing substrate

Abstract: A printing substrate adapted to receive ink droplets to form an image generated by an ink jet printer which comprises a transparent support carrying a layer comprising at least 70 weight percent polyurethane and 5 to 30 weight percent of a polymer selected from the group consisting of polyvinylpyrrolidone, polyvinylpyrrolidone/vinyl acetate copolymer, poly(ethyleneoxide), gelatin and polyacrylic acid.

High damping material composition

Abstract: A high damping material composition useful as a vibration damper and an acoustic insulating material such as a sound insulating wall for an acoustic room, a sound insulating partition for a construction structure and a soundproofing wall for a vehicle. The high damping material composition of the present invention containing the following components (A) and (B); (A) a polymer having in the molecular chain thereof a chemical structural unit derived from the following (a); (a) at least one selected from the group consisting of an acrylic monomer, a methacrylic monomer, an ethylene-acrylic copolymer, an ethylene-methacrylic copolymer and vinyl acetate; (B) at least one damping property imparting agent selected from the group consisting of a hindered phenol compound, a phosphite ester compound, a phosphate ester compound, a basic compound containing nitrogen and a hindered amine compound. The combined use of the component (A) and (B) makes an interaction therebetween homogeneous and appropriate, so that the component (B) is homogeneously dispersed in the component (A), resulting in exhibition of a high tan δ. Moreover, the homogeneous dispersion can be maintained for a long period thereby to prevent a declined of tan δ with time. The compositions have a tan δ peak temperature of approximately room temperature, which makes the compositions suitable for use in a room temperature atmosphere.