Solid acrylic resin using a continuous tube reactor

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 220/06 (2006.01) C08F 2/02 (2006.01) C08F 6/26 (2006.01) C08F 212/06 (2006.01)

Patent

CA 2218802

Described is a process for making acrylic resins suitable as polymeric surfactants used in emulsion polymerization, as pigment grinding resins and for preparing dispersions used as overprint varnishes. The feedstock is styrene, .alpha.-methyl styrene, acrylic acid and a polymerization initiator and is preferably free of solvent. This mix is passed through a continuous tube reactor run at a controlled range of pressure and relatively low residence time and temperature. Optimally, when the polymer/unreacted monomers blend exits the reactor and is devolatilized, the recovered monomers are used to make up part of the feedstock.

Divulgation d'un procédé de fabrication de résines acryliques utilisables comme surfactants polymères lors de polymérisation d'émulsion, comme résines de broyage de pigments ou pour préparer des dispersions utilisées comme vernis à surimpression. La charge d'alimentation est constituée de styrène, d'.alpha.méthylstyrène, d'acide acrylique et d'un amorceur de polymérisation, et est de préférence exempte de solvant. On fait passer ce mélange dans un réacteur tubulaire ouvert, sous une gamme de pressions contrôlées, à une température relativement basse et pendant une durée relativement courte. Facultativement, lorsque le mélange de polymère et de monomères n'ayant pas réagi sort du réacteur et est libéré des matières volatiles, les monomères récupérés sont réutilisés dans la charge d'alimentation.

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