Vinyl Ethers

Vinyl Ethers

 

derivatives of vinyl alcohol. Vinyl alcohol is not produced in the free state, since at the moment of formation it isomerizes to acetaldehyde. Both simple vinyl ethers, CH2=CHOR (I), and complex vinyl ethers, CH2=CH—OCOR (II), are known. These compounds are formed by the vinylation of alcohols and carboxylic acids:

Vinyl ethers are colorless liquids, only slightly soluble in water but readily soluble in organic solvents. For vinyl methyl ether, Tb = 5.5° C, and its density at 20° C is 0.772 g/cm3; for vinyl ethyl ether, Tb = 36° C, and its density at 20° C is 0.753 g/cm3; and so on. The best-known complex ether is vinyl acetate. Vinyl ethers are chemically active compounds, which readily add halogens, halogen hydrides, and other substances. Hydrolysis of (I) yields acetaldehyde and the corresponding alcohol, and hydrolysis of (II) yields acetaldehyde and carboxylic acid:

The most important property of vinyl ethers is their ability to polymerize and copolymerize.

References in periodicals archive ?
In fact, living carbocationic polymerization systems have been developed for a number of monomers including vinyl ethers, isobutylene, and styrene.
In addition, the fatty acid-substituted vinyl ethers can be copolymerized with water-soluble monomers to form polymers that can be dispersed in water without the need for an added surfactant.
Curable candidates include acrylates, methacrylates, styrene, epoxies, vinyl ethers, and cyanate esters.
When the photolysis of the vinyl ethers were carried out in presence of air in acetonitrile as solvent, a C=C bond scission occurred, that resulted in the formation of the ketone (about 60%), while the expected aldehyde was obtained as a minor product (about 20%).
Raw materials are discussed for both free radical and cationic systems in terms of monomers, oligomers, vinyl ethers, epoxies as well as photoinitiators.
1:30-2:00 pm--Fluoroethylene vinyl Ethers Resins for Applications in Marine Coatings--Winn Darden, Takasi Takayanagi, Sho Masuda, and Isao Kimura, AGC Chemicals Americas
To make the dispersions, equimolar amounts of chlorotrifluoroethylene and a variety of functionalized vinyl ethers were polymerized.
increase for ethylene carbonate and propylene carbonate and 8% increase for propargyl alcohol, vinyl ethers and specialty pyrrolidones in U.
The overtone band in vinyl ethers is shifted to about 1612 nm, whereas cycloaliphatic epoxies (in contrast to glycidyl ethers) unfortunately do not show a specific overtone or combination band in the near-infrared spectrum which could be used for the monitoring of their conversion.
Rohm and Haas Company has received a patent for a method for making a coating having a low gloss finish comprised of disposing a layer of a coating powder onto a substrate, wherein the coating powder comprises one or more than one cationic curable resin chosen from aromatic epoxides, polyglycidyl compounds having an aromatic structure, epoxy novolac resins, epoxy cresol resins, vinyl ethers, oxetanes, oxolanes, cyclic acetals, thiiranes, thiotanes, and combinations thereof; one or more cationic photoinitiator; one or more free radical curable resin; and one or more free radical photoinitiator.
Products: Propargyl alcohol, vinyl ethers, and specialty pyrrolidones
Features strong solvent for polymers (epoxies and polyamides), acrylate monomer free, excellent toxicology profile, good adhesion on difficult substrates, low, but effective levels of vinyl ether, hydrophobicity.