Process for the production of improved psa's

Details Process for the production of improved psa's Process for the production of improved psa's

C - Chemistry, Metallurgy

08

F

C08F 220/12 (2006.01) C08F 220/18 (2006.01) C09J 133/08 (2006.01)

Patent

CA 2297970

General purpose inherently tacky acrylic pressure sensitive adhesive polymers formed of alkyl acrylates, vinyl esters, and saturated carboxylic acids, having improved properties, a lower residual monomer content are formed by a sequential emulsion polymerization process in which 40 to 70 percent, typically 45 percent, of the monomers are incrementally added to a reactor as a first charge containing substantially all of the vinyl esters, the balance of the monomers being fed in a second incremental charge.

L'invention a trait à des polymères acryliques fondamentalement adhésifs et sensibles à la pression (PSA), formés d'acrylates d'alkyle, d'esters vinyliques et d'acides carboxyliques saturés. Ces polymères présentent des propriétés améliorées, une teneur inférieure en monomères résiduels et sont formés grâce à un procédé de polymérisation en émulsion séquentielle au cours duquel de 40 à 70 %, mais généralement 45 %, des monomères sont ajoutés de manière incrémentielle à un réacteur, sous forme d'une première charge renfermant sensiblement tous les esters vinyliques. Le complément monomère est introduit au moyen d'une seconde charge incrémentielle.

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