(Meth)acrylic copolymer, polymer solution, polymer-containing composition, anti-fouling coating composition, and method for producing (meth)acrylic copolymer

A polymer-containing composition comprising:

• a solvent;
• and
• a methacrylic copolymer comprising:
• at least one kind of constitutional unit selected from the group consisting of
• (i) a constitutional unit (A1) having at least one structure selected from the group consisting of structures represented by formula (1), formula (2), or formula (3);
• wherein, X represents —O—, —S—, or —NR14—, R14 represents a hydrogen atom or an alkyl group, R1 and R2 each represent a hydrogen atom or an alkyl group having from 1 to 10 carbon atoms, R3 and R5 each represent an alkyl group having from 1 to 20 carbon atoms, a cycloalkyl group, or an aryl group, and R4 and R6 each represent an alkylene group having from 1 to 10 carbon atoms;
• (ii) a constitutional unit (A2) having a triorganosilyloxycarbonyl group;
• and
• (iii) a constitutional unit (A3) having at least one structure selected from the group consisting of structures represented by formula (4) or (5);
• —COO-M-OCO (4)
• —COO-M-R32 (5)
• wherein, M represents Zn, Cu, Mg, or Ca and R32 represents an organic acid residue other than a (meth)acryloyloxy group;
• and
• a constitutional unit (B) derived from a macromonomer (b)
• having two or more constitutional units represented formula (b′) and a number average molecular weight of from 500 to 50000:
• wherein, R41 represents a hydrogen atom, a methyl group, or CH2OH and R42 represents OR43, a halogen atom, COR44COOR45, CN, CONR46R47 or R48 where R43 to R47 each independently represent a hydrogen atom, an unsubstituted or substituted alkyl group, an unsubstituted or substituted alicyclic group, an unsubstituted or substituted aryl group, an unsubstituted or substituted heteroaryl group, an unsubstituted or substituted nonaromatic heterocyclic group, an unsubstituted or substituted aralkyl group, an unsubstituted or substituted alkaryl group, or an unsubstituted or substituted organosilyl group and R48 represents an unsubstituted or substituted aryl group or an unsubstituted or substituted heteroaryl group;
• wherein a content of the organic solvent is 30% by mass or more with respect to a total amount of the polymer-containing composition excluding the (meth)acrylic copolymer, and
• wherein a water content is 15% by mass or less.