Block type unsaturated copolyester, UV viscosity-reducing glue containing polyester and application of block type unsaturated copolyester and UV viscosity-reducing glue

The invention relates to a block type unsaturated copolyester, a UV viscosity-reducing adhesive containing the same and application of the block type unsaturated copolyester and the UV viscosity-reducing adhesive. The block type unsaturated copolyester is obtained by polycondensation of unsaturated polyester and polyester polyol; wherein the unsaturated polyester is prepared from the following raw materials: unsaturated binary acid or anhydride thereof, dihydric alcohol and a bisphenol compound. The UV viscosity-reducing glue containing the block type unsaturated copolyester has high initial viscosity, the cohesion can be improved without adding a curing agent, the adhesion to a base material is relatively high, the viscosity-reducing efficiency is high, and no residual glue exists after viscosity reduction. 本发明涉及一种嵌段型不饱和共聚酯与包含该聚酯的UV减粘胶及其应用。所述嵌段型不饱和共聚酯由不饱和聚酯与聚酯多元醇缩聚得到；其中，所述不饱和聚酯的制备原料包括不饱和二元酸或其酸酐、二元醇、双酚化合物。包含该嵌段型不饱和共聚酯的UV减粘胶具有高初粘性、无需外加固化剂即可提升内聚力、对基材的附着力较高、减粘效率高、减粘后无残胶。