Dsm IP Assets B.v.

Gerbert Dijkstra

Johan Franz Gradus Antonius Jansen

Tosko A Misev

Leendert Jan Molhoek

Matthias Johannes Cornelis Bos

Gerrit Johannes De Lange

Johan Franz Gradus Jansen

De Gerrit Johannes Lange

Tosko Alexandar Misev

Heat-curable powder coating compositions are provided which include i) at least one crystalline polyester resin present in an amount of at least 7.5 wt %; ii) at least one amorphous polyester resin present in an amount of at most 92.5 wt %; and iii) at least one peroxide present in an amount of at least 0.65 parts of peroxide in hundred parts of i)+ii) (pph), wherein the at least one crystalline polyester resin has 2-butenedioic acid ethylenic unsaturations and/or the at least one amorphous polyester resin has 2-butenedioic acid ethylenic unsaturations. The compositions may be cured to an acceptable degree at low temperature, e.g., 130&#xb0; C. /20 minutes offering powder coatings that may exhibit enhanced flexibility and good adhesion. In addition, the compositions can suitably be used on heat- and/or non heat-sensitive substrates, even if the composition is highly pigmented.

Low temperature heat-curable powder coating composition comprising a crystalline polyester resin, an amorphous resin and a peroxide

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Zwolle, Netherlands

Gerbert Dijkstra