High temperature polymerization process for making branched...

C - Chemistry – Metallurgy – 08 – F

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C08F 2/06 (2006.01) C08F 220/18 (2006.01) C08F 222/10 (2006.01) C09D 133/06 (2006.01)

Patent

CA 2620914

The present invention is directed to preparation of branched acrylic polymers, and caprolactone-modified branched acrylic polymers, in a high temperature free-radical acrylic polymerization process. The polymerization is conducted at or above 130~ C to produce polymers having a high degree of branching. The polymers so prepared can be used as binder resin and/or rheology control agent in high solids coating compositions, especially coating compositions useful for finishing automobiles and truck exteriors.

La présente invention concerne la préparation de polymères acryliques ramifiés et de polymères acryliques ramifiés modifiés par une caprolactone, dans un procédé de polymérisation acrylique radicalaire à haute température. On effectue la polymérisation à une température supérieure ou égale à 130°C pour produire des polymères ayant un degré de ramification élevé. On peut utiliser les polymères ainsi préparés comme résine liante et/ou agent d'ajustement de la rhéologie dans des compositions de revêtement à haute teneur en matières solides, en particulier des compositions de revêtement utiles pour la finition d'automobiles et d'extérieurs de camions.

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