GRAFTED AUTOXIDISABLE POLYESTER RESIN

摘要

A method for preparing a grafted autoxidisable polyester resin wherein the resin is obtained by steps comprising: a) grafting of at least a diacid or its anhydride onto a first agent by a Diels-Alder and/or Ene reaction; and b) reacting the product of step a) with a second agent. The first agent comprises at least one first functionality selected from a group consisting of a first set of conjugated double bonds or a first allylic hydrogen and comprises at least one further functionality selected from the group consisting of a set of conjugated double bonds, allylic hydrogen, non conjugated double bond, OH group, COOH group and amino group. The second agent is selected from the group consisting of alcohol with a number average hydroxy functionality > 2.0, dialkanolamine or mixtures thereof. The grafted autoxidisable polyester resin has an oil length = 80, a number average molecular weight Mn = 1000 g/mol and a PDI = 3. The grafted autoxidisable polyester resin is for example highly advantageous in high solid coating formulations and provides very low viscosities in combination with low drying times and relatively high average molecular weight.