Rheology control agent and curable composition using the same

A curable composition comprising:

• a rheology control agent for a curable composition;
• and
• a binder,
• the rheology control agent comprising:
• a diamide compound (A) and/or a hydrogenated castor oil (A′), the diamide compound (A) being obtained by condensation reaction between a diamine component (A1) and a monocarboxylic acid component (A2), the diamine component (A1) being selected from the group consisting of diamines with 2 to 12 carbon atoms, and the monocarboxylic acid component (A2) being selected from the group consisting of hydrogenated castor oil fatty acids and linear saturated fatty acids;
• and
• a polyamide compound (B) obtained by polycondensation of an amine component (B1) and a carboxylic acid component (B2), wherein
• the amine component (B1) contains at least one amine selected from the group consisting of diamines with 2 to 54 carbon atoms and triamines with 2 to 54 carbon atoms,
• the carboxylic acid component (B2) contains at least one carboxylic acid selected from the group consisting of dicarboxylic acids with 4 to 54 carbon atoms and tricarboxylic acids with 4 to 54 carbon atoms,
• the polyamide compound (B) is a polyamide obtained by polycondensation of at least one of the amine component (B1) containing polymerized fatty acid derivatives and the carboxylic acid component (B2) containing polymerized fatty acids,
• the polyamide compound (B) has a weight-average molecular weight of 5,132 or more and 21,000 or less, and
• a cured product of the curable composition is used for a sealant or an adhesive.