Process for preparing solvent-type acrylic...

C - Chemistry – Metallurgy – 09 – J

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C09J 133/06 (2006.01) A61F 13/02 (2006.01) A61L 15/58 (2006.01) C08F 20/12 (2006.01) C09J 7/04 (2006.01) C09J 133/08 (2006.01)

Patent

CA 2212866

The object is directed toward obtaining a process for preparing a solvent-type acrylic pressure-sensitive adhesive which is able to increase a conversion at polymerization in the preparation of the solvent-type acrylic pressure- sensitive adhesive to thereby solve the problems of odors associated with residual monomers and of attachment of gels on reactor walls, and further to provide improved productivity and workability. In the preparation of the solvent-type acrylic pressure-sensitive adhesives, a monomer composition containing alkyl (meth)acrylate ester as its main component is subjected to solution polymerization under a closed condition at least in a latter stage of the polymerization reaction. In the polymerization, the solution to be polymerized is maintained at temperatures not lower than a boiling point thereof under normal pressures or at 50-120

La présente invention concerne un procédé de préparation d'un adhésif acrylique du genre solvant, sensible à la pression, qui peut améliorer la conversion en polymère, ce qui permet de résoudre les problèmes de l'odeur et du dépôt de gel sur le réacteur dû à des monomères résiduels. Cet adhésif présente un rendement et une aptitude de mise en oeuvre excellents. Dans la préparation d'un adhésif acrylique du genre solvant, sensible à la pression, une composition monomère comprenant des alkyl(méth)acrylates comme éléments constitutifs principaux subit une polymérisation en solution dans un récipient hermétiquement clos, au moins durant la deuxième moitié de la polymérisation, et, pendant la polymérisation, la solution de monomères est maintenue à une température qui n'est pas inférieure au point d'ébullition de la solution à la pression normale, ou à 50 à 120 DEG C.

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