Rheology control agents, adhesion improvers and non-aqueous paint compositions

An adhesion improver for a non-aqueous paint, the adhesion improver comprising a fatty acid diamide (A) obtained by condensation reaction between a diamine component (A1) and a monocarboxylic acid component (A2) containing at least one or more straight-chain saturated fatty acids, wherein

• the adhesion improver is composed of a polyamide compound (B) obtained by polycondensation of an amine component (B1) and a carboxylic acid component (B2),
• 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, and
• the polyamide compound (B) is a polyamide that satisfies both of the following conditions (1) and (2):
• (1) a weight-average molecular weight is less than 27,600 and an acid value is 18 or greater, and
• (2) a relationship 10≤(weight-average molecular weight)/(acid value)<806 is satisfied.

A non-aqueous paint composition comprising a rheology control agent containing:

• a fatty acid diamide (A) obtained by condensation reaction between a diamine component (A1) and a monocarboxylic acid component (A2);
• and
• a polyamide compound (B) obtained by polycondensation of an amine component (B1) and a carboxylic acid component (B2), wherein
• the monocarboxylic acid component (A2) contains at least one or more straight-chain saturated fatty acids,
• 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, and
• the polyamide compound (B) is a polyamide that satisfies both of the following conditions (1) and (2):
• (1) a weight-average molecular weight is less than 27,600 and an acid value is 18 or greater, and
• (2) a relationship 10≤(weight-average molecular weight)/(acid value)<806 is satisfied.

A non-aqueous paint composition comprising:

• a rheology control agent containing a fatty acid diamide (A) obtained by condensation reaction between a diamine component (A1) and a monocarboxylic acid component (A2);
• and
• an adhesion improver composed of a polyamide compound (B) obtained by polycondensation of an amine component (B1) and a carboxylic acid component (B2), wherein
• the monocarboxylic acid component (A2) contains at least one or more straight-chain saturated fatty acids,
• 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, and
• the polyamide compound (B) is a polyamide that satisfies both of the following conditions (1) and (2):
• (1) a weight-average molecular weight is less than 27,600 and an acid value is 18 or greater, and
• (2) a relationship 10≤(weight-average molecular weight)/(acid value)<806 is satisfied.