I need a method for preparation of carboxylated ethyl vinyl acetate copolymer by solution process.
link for research article if any?
Hello
find papers in attachments & links here , Hope help you
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http://chempedia.info/info/37962/
http://www.patentgenius.com/patent/4157362.html
https://docs.google.com/viewer?url=patentimages.storage.googleapis.com/pdfs/US4157362.pdf
Hello Mr. Swain
production process of the different EVA copolymers is well-known. Also the treatment of alkali cellulose using chloro acetic acid to receive CMC with DS approx 67 % is state of the art. But carboxyalkylation of EVA is difficult, because the vinyl groups are quite reactive and there are only a few cost-intensive protection methods for vinyl available.
Is the target a molecule carboxyalkyl-EVA or is it also possible to apply a compound EVA and CMC/CM-Starch together ? Co-processing would be more easy to handle and to perform. Best regards, Ralf Recknagel
Hello Mr. Päch
that´s right, partially hydrolyzed EVA copolymers (HEVA) are the right choice for etherification using chloroacetate, esp. for low DS qualities (film-forming, capsules and the like). High molecular, less saponized EVA grades are used as process aid for thermoplastics - then chloroacetate / isopropanole / N2 /.. need other conditions for the carboxyalkylation of EVA.
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