Patent ID: 7897718

Claim:
A method for preparing an acrylated semi-crystalline hyperbranched polyurethane oligomer, comprising forming a hydroxy-terminated hyperbranched polyurethane, and modifying the hydroxy-terminated hyperbranched polyurethane in a two-step process, wherein the two-step process includes the following steps: forming a long carbon chain with a carbon atom number higher than 10 or a benzene ring or a naphthalene ring at a portion of the terminal hydroxyl groups of the hydroxy-terminated hyperbranched polyurethane to obtain a semi-crystalline hyperbranched intermediate possessing residual terminal hydroxyl groups, and making a modification to the residual terminal hydroxyl groups of the hydroxy-terminated hyperbranched polyurethane with methacrylic and/or acrylic double bonds to form an acrylated semi-crystalline hyperbranched polyurethane oligomer.