| 摘要 |
An amorphous polyester resin of the invention is obtained by reaction between a polyester resin (A), obtained by reaction between a polyhydric alcohol component and a first poly-carboxylic acid component, either or both including a 3 or higher valent component, and having a weight-average molecular weight of 6,000 to 40,000 and a hydroxyl value of 15 to 70 mgKOH/g, and a second poly-carboxylic acid component (a), under conditions satisfying the following equations (1), (2) and (3), and the amorphous polyester resin satisfying the following equation (4). AV B - AV A / AV a = 0.5 - 0.7 Mw B / Mw A = 1.1 - 2.0 OHV B / AV B = 1.0 - 6.0 Mw B / Mn B = 3.0 - 15.0 [In the equations, AV B , OHV B , Mw B and Mn B respectively represent an acid value, a hydroxyl value, a weight-average molecular weight and a number-average molecular weight, and AV A and Mw A of the amorphous polyester resin respectively represent an acid value and a weight-average molecular weight of the polyester resin (A), where AV a represents a theoretical acid value of the second poly-carboxylic acid component (a).] |
