| 摘要 |
<p>Epoxy functional polyester resins (I), which are storage stable at temperatures up to 40 °C and have a Tg of more than 40 °C, and which are obtainable by a process, comprising the reaction of an epoxy functional polyester resin (II) obtainable by the reaction of epihalohydrin in the presence of a base with carboxyl functional polyester resins (III) obtainable by reacting: (a) at least one aromatic or cycloaliphatic dicarboxylic acid compound A comprising two aromatic- or secondary aliphatic carboxyl groups or the anhydride thereof; (b) at least one diol compound B comprising two aliphatic hydroxyl groups, which may independently be a primary or a secondary hydroxyl group; and optionally (c) compound C1 comprising one monofunctional primary- or secondary hydroxyl group and/or at least one compound C2 comprising one primary- or secondary hydroxyl group and one tertiary aliphatic carboxyl group; and optionally (d) a dihydroxymonocarboxylic acid compound D comprising a tertiary aliphatic carboxyl group and two aliphatic hydroxyl groups, which may each independently be primary or secondary hydroxyl; and optionally (e) a trihydroxyalkane (E1) or tetrahydroxyalkane (E2), the molar ratio of compounds A:B:C1:C2:D:E1:E2 being X+Y+1:X:M:N:Y:Z:Q wherein M+N is in the range of from 0 to 2, X ranges from 2 to 8 and Y ranges from 0 to 8, Z ranges from 0 to 2 and Q ranges from 0 to 2 at a temperature of from 100 to 220 °C, until essentially all the non-tertiary carboxyl groups as initially present in the reaction mixture have been reacted, having a WPE in the range of from 250 to 800, with a carboxy functional polyester resin derived from the herein before mentioned component (a) and (b) or with a component (a) alone, in the presence of a catalyst, and outdoor durable coating compositions comprising them.</p> |
