Ink based on fluorinated polymer having improved adhesion

1. A polymer-based ink comprising:

an electroactive PF polymer comprising units derived from vinylidene fluoride and units derived from trifluoroethylene,

wherein the proportion of units derived from trifluoroethylene is from 15 to 55 mol % relative to the total of units derived from vinylidene fluoride and trifluoroethylene, and

a PA polymer comprising units derived from a (meth)acrylic monomer and units comprising at least one associative group chosen among imidazolidonyl, triazolyl, triazinyl, bis-ureyl and ureido-pyrimidyl groups;

in solution in a solvent,

the solvent being chosen from the group consisting of dimethylformamide, dimethylacetamide, dimethylsulfoxide, ketones, furans, esters, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, propylene glycol methyl ether, carbonates, phosphates, and mixtures thereof.

2. The polymer-based ink according to claim 1 , in which the electroactive PF polymer also comprises units derived from at least one other monomer of formula CX 1 X 2 ═CX 3 X 4 , in which each X 1 , X 2 , X 3 and X 4 group is independently chosen among H, Cl, F, Br, I and alkyl groups comprising from 1 to 3 carbon atoms, which are optionally partially or fully halogenated.

3. The polymer-based ink according to claim 1 , wherein the electroactive PF polymer further comprises units derived from an additional monomer, said additional monomer being chlorotrifluoroethylene or 1,1-chlorofluoroethylene.

4. The polymer-based ink according to claim 1 , wherein the electroactive PF polymer comprises units derived from hexafluoropropene.

5. The polymer-based ink according to claim 1 , wherein the PA polymer comprises:

A units derived from a first monomer, chosen among methyl methacrylate and (methoxy)polyethylene glycol (meth)acrylate;

B units from a second monomer comprising an imidazolidonyl group;

optionally, C units derived from at least a third monomer, chosen among (meth)acrylic acid, its esters, its amides or its salts, itaconic acid, its esters, its amides or its salts, and styrene and its derivatives.

6. The polymer-based ink according to claim 5 , wherein the PA polymer comprises a molar proportion of 50 to 99% A units, of 1 to 20% B units, and of 0 to 49% C units.

7. The polymer-based ink according to claim 1 , wherein the electroactive PF polymer is present in a proportion of 70 to 99.9% by weight; and the PA polymer is present in a proportion of 0.1 to 30% by weight; the proportions being given relative to the total of the electroactive PF polymer and the PA polymer.

8. A method for preparing a polymer-based ink according to claim 1 , comprising dissolving the electroactive PF polymer, dissolving the PA polymer and mixing them in the solvent.

9. The method according to claim 8 , wherein the PA polymer is dissolved in a first portion of the solvent, the electroactive PF polymer is dissolved in a second portion of the solvent, then the first portion of the solvent and the second portion of the solvent are mixed.

10. A method of manufacturing a polymer film, comprising depositing the polymer-based ink according to claim 1 on a substrate, and evaporating of the solvent from the polymer-based ink.

11. An electronic device comprising a substrate coated with a polymer film manufactured according to the method of claim 10 .

12. The electronic device according to claim 11 , wherein the polymer film is an electroactive polymer film; or wherein the polymer film is a protective film.

13. The electronic device according to claim 11 , which is an optoelectronic device chosen from the group consisting of chosen among transistors, chips, batteries, photovoltaic cells, light-emitting diodes, sensors, actuators, transformers, haptic devices, microelectromechanical systems and detectors.