Polymer coatings having improved resistance to solvents

• US 20070105991A1
• Filed: 11/03/2006
• Published: 05/10/2007
• Est. Priority Date: 11/10/2005
• Status: Active Grant

• Current Assignee: Heraeus Clevios GmbH (Heraeus Holding GMBH)
• Original Assignee: HC Starck GmbH (OPUS Investment SARL)
• Inventors: Guntermann, Udo, Jonas, Friedrich
• Granted Patent: US 7,785,493 B2
• Time in Patent Office: Days
• US Class Current: 524/100
• CPC Class Codes: C08J 2367/02 Polyesters derived from dicarboxylic acids and dihydroxy compounds; C08J2367/06 takes precedence
• CPC Class Codes: C08J 2465/00 Characterised by the use of macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain C08J2407/00 - C08J2457/00, C08J2461/00 take precedence; Derivatives of such polymers
• CPC Class Codes: C08J 3/05 from solid polymers
• CPC Class Codes: C08J 7/0427 with only one layer of a composition containing a polymer binder with more layers C08J7/042
• CPC Class Codes: C08J 7/043 Improving the adhesiveness of the coatings per se, e.g. forming primers adhesives in the form of films or foils characterised by the primer layers between the polymer carriers and the adhesives C09J7/50
• CPC Class Codes: C08J 7/044 Forming conductive coatings; Forming coatings having anti-static properties
• CPC Class Codes: C09D 5/24 Electrically-conducting paints conductive materials H01B1/00

Abstract

The present invention relates to coatings comprising electrically conductive polymers and melamine derivatives, their preparation and use, and dispersions for the preparation of such coatings.

Claims

1. Dispersion comprising at least one electrically conductive polymer, at least one counter-ion and at least one dispersing agent, characterized in that it comprises at least one condensate of melamine with at least one carbonyl compound.

2. The dispersion according to claim 1, wherein said at least one conductive polymer(s) is/are polythiophenes, polyanilines or polypyrroles.

3. The dispersion according to claim 1, wherein the conductive polymer(s) is/are polyalkylenedioxythiophenes containing recurring units of the general formula (I)

4. The dispersion according to claim 1, wherein said at least one conductive polymer is poly(3,4-ethylenedioxythiophene).

5. The dispersion according to claim 1, wherein the counter-ion(s) is/are anions of polymeric carboxylic acids or sulfonic acids or monomeric C₁-C₂₀-alkanesulfonic acids, aliphatic C₁-C₂₀-perfluorosulfonic acids, aliphatic C₁-C₂₀-carboxylic acids, aliphatic C₁-C₂₀-perfluorocarboxylic acids, aromatic C₁-C ₂₀-sulfonic acids optionally substituted by C₁-C₂₀-alkyl groups, optionally substituted C₁-C ₂₀-cycloalkanesulfonic acids or tetrafluoroborates, hexafluorophosphates, perchlorates, hexafluoroantimonates, hexafluoroarsenates or hexachloroantimonates.

6. The dispersion according to claim 1, wherein said at least one counter-ion is the anion of polystyrenesulfonic acid.

7. The dispersion according to claim 1, wherein the condensate(s) of melamine with at least one carbonyl compound is/are optionally modified and/or optionally partly or completely etherified melamine-formaldehyde condensates.

8. The dispersion according to claim 1, wherein the melamine derivative(s) in an amount of from 1 to 30 wt. %, based on the total weight of the dispersion.

9. The dispersion according to claim 1, wherein the dispersion comprises at least one polymeric organic binder.

10. The dispersion according to claim 1, wherein the dispersion comprises water, aliphatic alcohols, aliphatic ketones, aliphatic carboxylic acid esters, aromatic hydrocarbons, aliphatic hydrocarbons, chlorohydrocarbons, aliphatic nitrites, aliphatic sulfoxides and sulfones, aliphatic carboxylic acid amides, aliphatic and araliphatic ethers or mixtures of at least two of the abovementioned substances as dispersing agents.

11. Method for the preparation of electrically conductive or antistatic coatings comprising using the dispersions according to claim 1.

12. Electrically conductive or antistatic coating obtainable from dispersions according to claim 1.

13. The dispersion according to claim 4, wherein said at least one counter-ion is the anion of polystyrenesulfonic acid.

14. The dispersion according to claim 13, wherein the condensate(s) of melamine with at least one carbonyl compound is/are optionally modified and/or optionally partly or completely etherified melamine-formaldehyde condensates.

15. The dispersion according to claim 14, wherein the dispersion comprises at least one polymeric organic binder.