Dsm Resins B.v.

Johannes T Evers

Andreas N Verwer

Robertus G Berenbak

The invention relates to crystalline unsaturated polyester, consisting of segments derived from a mainly hydroxy-terminated, unsaturated polyester, bound through urethane bonds to units derived from a (poly)isocyanate and further, if desired, in an amount that is at most relatively small, units, bound via urethane bonds, that are derived from a diol containing between 2 and 12 carbon atoms and/or from a diamine containing between 2 and 12 carbon atoms and/or from an alkanolamine containing between 2 and 12 carbon atoms.

Crystalline unsaturated polyester and the preparation thereof

Powdery coating agent, suitable for application in the in-mould coating technique, comprising as the main component, besides a curing catalyst and if desired other additives, a crystalline unsaturated polyester with a melting point of at least 40.degree. C., a degree of unsaturation of between 1 and 5 moles unsaturation per 1000 g polyester and a viscosity in the melt at 120.degree. C. of at least 1 dPa.s.

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Maarn, Netherlands

Johannes T Evers