Hoechst Aktiengesellschaft

Solutia Italy S.r.l.

Hoechst Sara S.p.a.

Silvestro Farronato

Sergio Gazzea

Roberto Chinellato

Resins comprising (meth)acrylic unsaturations are obtained by reacting functional groups of unsaturated monomers without solvents at temperatures above 150&deg; C. and under controlled heat exchange, while maintaining intact their unsaturations, with functional groups of saturated and/or unsaturated polymers. The technologies and the work cycles used for conventional resins may also be used for these resin types.

Process for synthesis of resins containing unsaturations of the (meth) acrylic type to be cured by radiation or heat and used for powder paints

Process for continuous production of matt or satin powder paints

A solid polymer binder for thermosetting powder coating compositions obtained by combining (A) a polyurethane prepolymer containing carboxyl groups and derived from polyisocyanates, hydroxycarboxylic acids and blocking agents different from oximes, containing 1 to 40% by weight of blocked isocyanate groups and having an acid number of 1 to 80, with (B) at least one homo- and/or heterofunctional compound which either contains hydroxyl groups or is capable of forming them by reaction, component (B) being present in an amount such that cross-linked products are formed under stoving conditions, in which the content of COOH-groups is not higher than 1.5% referred to the weight of components (A) and (B), a thermosetting powder composition containing such binder, a metal object coated with such thermosetting powder coating composition, and a process for the manufacture of coatings on metal substrates with such powder coating composition.

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Romano d'Ezzelino, Italy

Silvestro Farronato