| 摘要 |
A polyester resin and paint including the same are provided to form a film with excellent scratch resistance and gloss, and to be useful as paints for coating a pre-coated metal primer. A polyester resin comprises a polybasic acid component and a polyhydric alcohol component. The polybasic acid component includes an aromatic diacid component of more than 80 mole % based on the whole polybasic acid component. The polyhydric alcohol component comprises aliphatic dihydric alcohol of 60-95 mole % and an isorbide compound of 5-40 mole % represented by chemical formula 1. The polyester resin has a number average molecular weight(Mn) of 8,000-20,000, a hydroxyl group value of 5-20 mgKOH/g, an acid value of 1-5 mgKOH/g, and a glass transition temperature(Tg) of 35-80 °C.
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