Patent ID: 7939577

Claim:
A method for preparing a radiation-curable alkoxy silanized hyperbranched polyester acrylate, comprising the steps of: (i-1) melting a hydroxyl-terminated hyperbranched polyester with a functionality number greater than or equal to 16 at 120-180° C. and cooling the melt to 90-120° C., and then adding an unsaturated end-capping compound (A) to the melt so as to form radiation-curable acrylate groups on a portion of the terminals of the hyperbranched polymer; or; (i-2) dissolving an unsaturated end-capped compound (D) and a saturated isocyante (C) in a molar amount equal to that of the hydroxyl groups of the unsaturated end-capping compound in a solvent; conducting the reaction at 0-70° C. in the presence of a polymerization inhibitor and a catalyst and under the protection of an inert gas until the isocyanate group value becomes half of the initial value; and then adding a hydroxyl-terminated hyperbranched polyester with a functionality number greater than or equal to 16 for a further reaction at 20-100° C. for 3-7 hours until the infrared absorption peaks corresponding to isocyanate group disappear, so as to form radiation-curable acrylate groups on a portion of the terminals of the hyperbranched polymer; and (ii) adding an isocyanated silane coupling agent to prepare the radiation-curable alkoxy silanized hyperbranched polyester acrylate with a portion of the terminal groups formed into radiation-curable acrylate groups and another portion of the terminal groups formed into alkoxy silicon groups, wherein the unsaturated end-capping compound (A) includes an unsaturated monocarboxylic anhydride, unsaturated monocarboxylic acid, or unsaturated acyl chloride; the saturated isocyanate (C) includes a saturated diisocyanate; and the unsaturated end-capping compound (D) includes an unsaturated hydroxyl compound.