Polymer compound, intermediate composition, negative electrode, electricity storage device, and method for producing polymer compound

A polymer compound for use as a negative electrode binder of an electricity storage device, characterized in that

• the polymer compound is made by condensing a polyamideimide, a vinyl polymer, and a polyfunctional amine,
• the vinyl polymer is a random copolymer comprising, as constitutional units,
• a vinyl monomer having a side chain capable of forming an amide bond or an imide bond between the vinyl polymer and an amino group or a carboxyl group, and
• a vinyl monomer forming no amide bond nor imide bond between the vinyl polymer and an amino group or a carboxyl group, and
• the polyfunctional amine is an aromatic polyfunctional amine represented by the following general formula (3):
• where Y is a straight-chain alkyl group having 1 to 4 carbon atoms, a phenylene group, or an oxygen atom;
• and R1 and R2 are each independently a hydrogen atom, a methyl group, a trifluoromethyl group, or a methoxy group.

An intermediate composition of a polymer compound for use as a negative electrode binder of an electricity storage device, the intermediate composition being characterized by:

• a polyamideimide;
• a vinyl polymer;
• and
• a polyfunctional amine, wherein
• the vinyl polymer is a random copolymer comprising, as constitutional units,
• a vinyl monomer having a side chain capable of forming an amide bond or an imide bond between the vinyl polymer and an amino group or a carboxyl group, and
• a vinyl monomer forming no amide bond nor imide bond between the vinyl polymer and an amino group or a carboxyl group, and
• the polyfunctional amine is an aromatic polyfunctional amine represented by the following general formula (3):
• where Y is a straight-chain alkyl group having 1 to 4 carbon atoms, a phenylene group, or an oxygen atom;
• and R1 and R2 are each independently a hydrogen atom, a methyl group, a trifluoromethyl group, or a methoxy group.

A method for producing a polymer compound for use as a negative electrode binder of an electricity storage device, the method comprising condensing a polyamideimide, a vinyl polymer, and a polyfunctional amine, wherein

• the vinyl polymer is a random copolymer comprising, as constitutional units,
• a vinyl monomer having a side chain capable of forming an amide bond or an imide bond between the vinyl polymer and an amino group or a carboxyl group, and
• a vinyl monomer forming no amide bond nor imide bond between the vinyl polymer and an amino group or a carboxyl group, and
• the polyfunctional amine is an aromatic polyfunctional amine represented by the following general formula (3):
• where Y is a straight-chain alkyl group having 1 to 4 carbon atoms, a phenylene group, or an oxygen atom;
• and R1 and R2 are each independently a hydrogen atom, a methyl group, a trifluoromethyl group, or a methoxy group.