| abstract |
A crystalline or semi-crystalline polyurethane (PU) oligomer or polymer comprising copolymerisation of monomer I, which is at least one diisocyanate with a flexible backbone, such as hexamethylene diisocyanate, monomer II, which is at least one diol with a flexible backbone being aliphatic or ether, such as diethylene glycol, and monomer A, such as 2,2-dihydroxymethylbutyl acrylate, or 2,2-bis(hydroxymethyl)butyric acid. The polyurethane (PU) oligomer or polymer may also comprise monomer B, such as 2-butyl-2-ethyl-1,3-propanediol. The oligomer or polymer is UV or thermally curable and is suitable for powder coatings. |