Vinyl Ethers Application

8 21 227 228 the mechanism for chain transfer is shown in scheme 9 for the case of α benzyloxystyrene 15 the driving force for fragmentation is provided by formation of a strong carbonyl double bond.

Vinyl ethers application.

Vinyl ethers 1 x ch 2 a o can be very effective addition fragmentation chain transfer agents. Vinyl ethers undergo homopolymerization via a cationic mechanism. Essentially they comprise a base of polyester resin strengthened with epoxy molecules in the backbone of the molecular chain. Add an oxygen into the monomer though and that degree of uniformity becomes harder to enforce.

It is also important that r is a good radical leaving group. Teator and leibfarth report a general protocol to polymerize a variety of such vinyl ethers isotactically see the perspective by foster and o reilly. Usage of calcium carbide for vinylation reaction is a rapidly expanding area with numerous research efforts to produce ves from alcohols thiols amines among many other examples 69 71 74. Well optimized catalysts produce vast quantities of isotactic polypropylene in which the side chains all face the same way.

Many different vinyl ethers are commercially available today. It is used as a synthetic building block and a monomer. Vinyl ethers undergo radical initiated copolymerization in the presence of specific monomers such as maleates fumarates and acrylics. Vinyl esters also use peroxides e g.

Vinyl ether hydroxy vinyl ethers prior art date 1950 03 02 legal status the legal status is an assumption and is not a legal conclusion. Certain vinyl ethers obtained through the carbide route can be utilized as monomers in polymerization by cationic and free radical mechanisms. Commercial interest has also focused on polymers derived from ethyl isobutyl octadecyl substituents in place of methyl. The electron rich nature of vinyl ethers ch2 chor enables their versatile reactivity patterns with transition metal catalysts.

Polyvinyl ethers are a class of organic polymers derived from vinyl ethers common monomers include methyl vinyl ether and ethyl vinyl ether the polymer having the formula ch 2 ch or n r methyl ethyl. Ethyl vinyl ether is an organic compound with the chemical formula ch 3 ch 2 och ch 2. 1930s based on the reppe reaction of acetylene with alcohols. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed expired lifetime application number us147333a inventor robert l adelman.

From the portfolio of available vinyl ethers the higher boiling and the difunctional vinyl ethers are preferred in coatings applications. Furthermore they are highly attractive monomers for the synthesis of many polymers and copolymers. Vinyl ester resins are produced by the reaction esterification between an epoxy resin and an unsaturated monocarboxylic acid. Low molecular weight vinyl ethers are versatile monomers for polymerization.