Crystalline polyester resin and polyester resin aqueous dispersion, and composition for adhesion or coating use in which each of said crystalline polyester resin and polyester resin aqueous dispersion is used

A crystalline polyester resin comprising:

• a polyvalent carboxylic acid component and polyhydric alcohol component as copolymerization components, wherein,
• the polyvalent carboxylic acid component contains 30 to 70 mol % of terephthalic acid, 10 to 60 mol % of 1,4-cyclohexanedicarboxylic acid, 5 to 30 mol % of aliphatic dicarboxylic acid having 10 or less carbon atoms, and less than 3 mol % of an aromatic dicarboxylic acid component having a sulfonate group relative to 100 mol % total polyvalent carboxylic acid component;
• and
• the polyhydric alcohol component consists of 90 to 100 mol % 1,4-butanediol and 0 to 10 mol % of a polyhydric alcohol component other than 1,4-butanediol relative to 100 mol % total polyhydric alcohol component,
• wherein the polyhydric alcohol component other than 1,4-butanediol is at least one selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, 2,2-dimethyl-1,3-propanediol, glycerol, mannitol, pentaerythritol, trimethylolethane, and trimethylolpropane;
• wherein,
• an acid value of the crystalline polyester resin is 100 to 600 eq/t;
• a glass transition temperature of the crystalline polyester resin is −30 to 30° C.;
• a melting point of the crystalline polyester resin is 70 to 160° C.;
• and
• a number-average molecular weight of the crystalline polyester resin is 5,000 to 40,000.