Abstract: A titanium catalyst and a synthesizing method of polyester resins are provided in the present disclosure. The titanium catalyst has a chemical structure represented by Formula (I), Formula (II) or Formula (III). The symbols shown in the Formula (I), the Formula (II) or the Formula (III) are defined in the description. The synthesizing method of polyester resins includes providing the titanium catalyst, performing a feeding step, performing a heating and pressurizing step and performing a heating and vacuuming step. The titanium catalyst and a heat stabilizer are added into an autoclave before the feeding step or before the heating and vacuuming step.

Abstract: A repeatedly written soft base material is a heat-proof aluminum foil paper that can be rolled as a cylinder and comprises a white writing layer preprocessed and coated on the base material in a powder coating manner, and a repeatedly adhesive layer or a double sided tape disposed on another side of the base material. The powder coating method includes adding few fiberglass and CaCO3 into solvent resistance paints to compound powder paints, and then coating the powder paints onto one side of the base material by using static electricity theory, finally baking the base material at 200 degree temperature. Besides, a release paper can be adhered on a surface of the adhesive layer of the base material.