| abstract |
The invention discloses a kind of terminal carboxyl polyester resins, are obtained by the group lease making melt polycondensation reaction of following weight percent content: polyalcohol 25~45%, aromatic polycarboxylic acid 35~65%, aliphatic polyol acid 0~3%, branching agent 0~1%, acidolysis agent 6~20%, esterification catalyst 0.01~0.15%.The invention also discloses the preparation methods of the carboxyl polyester resin.The polyester resin has suitable glass transition temperature, softening point, viscosity and storage stability, prepares 60 ° of gloss, excellent flow leveling and the weather resistance that resulting powdery paints has 96% or more with it. |