Electrostatic composition based on a polyamide matrix

1. A process for producing an article, comprising:

forming an article from a composition comprising a polyamide matrix, wherein the composition comprises:

2 to 10% by weight of carbon black as an electrically conductive filler, with respect to the total weight of the composition, and

1% to 30% by weight of one or more antistatic agents, with respect to the total weight of the composition;

and

applying paint to the article by electrostatic deposition,

wherein one of the antistatic agents is a polyetheramide represented by formula (I):

in which:

n is an integer between 5 and 50;

X represents an oxygen atom or an NH group;

PAO represents a poly(alkylene oxide) block;

PA represents a polyamide block, the repeat unit of which is represented by either of the formulae (IIa) or (IIb):

in which: R 1 , R 2 and R 3 are aromatic or aliphatic radicals having 4 to 36 carbon atoms.

2. The process of claim 1 , wherein the composition exhibits a surface resistivity of between 10 5 Ω and 10 11 Ω, measured according to Standard IEC 61340-4-1.

3. The process of claim 1 , wherein the composition has a discharge time of greater than or equal to 10 seconds, measured according to Standard IEC 61340-5-1.

4. The process of claim 1 , wherein the composition comprises 5 to 20% by weight of one or more of the antistatic agents, with respect to the total weight of the composition.

5. The process of claim 1 , wherein the composition further comprises one or more antistatic agents selected from the group consisting of a sodium alkylsulfonate; an alkylbenzenesulfonate; a primary, secondary, or tertiary amine; an ethoxylated amine; an ethoxylated alcohol; a glyceryl monostearate; a distearate; and a tristearate.

6. The process of claim 1 , wherein in formula (I), the radical R 1 is a linear divalent pentyl radical.

7. The process of claim 1 , wherein in formula (I), the PAO block is a poly(ethylene oxide) block.

8. The process of claim 1 , wherein the polyamide matrix is formed from at least one (co)polyamide which is: (co)polyamide 6; 4; 11; 12; 4,6; 6,6; 6,9; 6,10; 6,12; 6,18; 6,36; 6(T); 9(T); 6(I); MXD6; a copolymer thereof; or a blend thereof.

9. The process of claim 1 , wherein the composition further comprises at least one modifier of the impact strength selected from the group consisting of ethylene-propylene optionally grafted with maleic anhydride, ethylene-propylene-diene terpolymer optionally grafted with maleic anhydride, styrene-maleic anhydride, ultra-low-density polyethylene, linear low density polyethylene, styrene-butadiene compounds, styrene-ethylene-butadiene-styrene compounds, polypropylene, acrylic elastomers, copolymers and terpolymers of ethylene with acrylic or methacrylic derivatives and/or with vinyl acetate, ionomers, acrylonitrile-butadiene-styrene terpolymer, and acrylic-styrene-acrylonitrile terpolymer.

10. The process of claim 1 , wherein the article is formed by an extrusion process, a molding process, or an injection process.

11. A process for producing an article, comprising:

forming an article from a composition comprising a polyamide matrix, wherein the composition comprises:

2 to 10% by weight of carbon black as an electrically conductive filler, with respect to the total weight of the composition, and

1% to 30% by weight of one or more antistatic agents, with respect to the total weight of the composition;

and

applying paint to the article by electrostatic deposition,

wherein the composition has a discharge time of greater than or equal to 10 seconds, measured according to Standard IEC 61340-5-1, and

wherein one of the antistatic agents is a polyetheramide represented by the formula (I):

in which:

n is an integer between 5 and 50;

X represents an oxygen atom or an NH group;

PAO represents a poly(alkylene oxide) block;

PA represents a polyamide block, the repeat unit of which is represented by either of the formulae (IIa) or (IIb):

in which: R 1 , R 2 and R 3 are aromatic or aliphatic radicals having 4 to 36 carbon atoms.

12. The process of claim 11 , wherein the composition exhibits a surface resistivity of between 10 5 Ω and 10 11 Ω, measured according to Standard IEC 61340-4-1.

13. The process of claim 11 , wherein the composition comprises 5 to 20% by weight of antistatic agent, with respect to the total weight of the composition.

14. The process of claim 11 , wherein the composition further comprises one or more antistatic agents selected from the group consisting of a sodium alkylsulfonate; an alkylbenzenesulfonate; a primary, secondary, or tertiary amine; an ethoxylated amine; an ethoxylated alcohol; a glyceryl monostearate; a distearate; and a tristearate.

15. The process of claim 11 , wherein in formula (I), the radical R 1 is a linear divalent pentyl radical.

16. The process of claim 11 , wherein in formula (I), the PAO block is a poly(ethylene oxide) block.

17. The process of claim 11 , wherein the polyamide matrix is formed from at least one (co)polyamide which is: (co)polyamide 6; 4; 11; 12; 4,6; 6,6; 6,9; 6,10; 6,12; 6,18; 6,36; 6(T); 9(T); 6(I); MXD6; a copolymer thereof; or a blend thereof.

18. The process of claim 11 , wherein the composition further comprises at least one modifier of the impact strength selected from the group consisting of ethylene-propylene optionally grafted with maleic anhydride, ethylene-propylene-diene terpolymer optionally grafted with maleic anhydride, styrene-maleic anhydride, ultra-low-density polyethylene, linear low density polyethylene, styrene-butadiene compounds, styrene-ethylene-butadiene-styrene compounds, polypropylene, acrylic elastomers, copolymers and terpolymers of ethylene with acrylic or methacrylic derivatives and/or with vinyl acetate, ionomers, acrylonitrile-butadiene-styrene terpolymer, and acrylic-styrene-acrylonitrile terpolymer.

19. The process of claim 11 , wherein the article is formed by an extrusion process, a molding process, or an injection process.

20. A process for producing an article, comprising:

forming an article from a composition comprising a polyamide matrix, wherein the composition comprises:

2 to 10% by weight of carbon black as an electrically conductive filler, with respect to the total weight of the composition, and

1% to 30% by weight of antistatic agents, with respect to the total weight of the composition;

and

applying paint to the article by electrostatic deposition,

wherein one of the antistatic agents is a polyetheramide represented by the formula (I):

in which:

n is an integer between 5 and 50;

X represents an oxygen atom or an NH group;

PAO represents a poly(alkylene oxide) block;

PA represents a polyamide block, the repeat unit of which is represented by either of the formulae (IIa) or (IIb):

in which: R 1 , R 2 and R 3 are aromatic or aliphatic radicals having 4 to 36 carbon atoms and

wherein the composition further comprises one or more antistatic agents selected from the group consisting of a sodium alkylsulfonate; an alkylbenzenesulfonate; a primary, secondary, or tertiary amine; an ethoxylated amine; an ethoxylated alcohol; a glyceryl monostearate; a distearate; and a tristearate.

21. The process of claim 20 , wherein the composition exhibits a surface resistivity of between 10 5 Ω and 10 11 Ω, measured according to Standard IEC 61340-4-1.

22. The process of claim 20 , wherein the composition has a discharge time of greater than or equal to 10 seconds, measured according to Standard IEC 61340-5-1.

23. The process of claim 20 , wherein the composition comprises 5 to 20% by weight of antistatic agent, with respect to the total weight of the composition.

24. The process of claim 20 , wherein in formula (I), the radical R 1 is a linear divalent pentyl radical.

25. The process of claim 20 , wherein in formula (I), the PAO block is a poly(ethylene oxide) block.

26. The process of claim 20 , wherein the polyamide matrix is formed from at least one (co)polyamide which is: (co)polyamide 6; 4; 11; 12; 4,6; 6,6; 6,9; 6,10; 6,12; 6,18; 6,36; 6(T); 9(T); 6(I); MXD6; a copolymer thereof; or a blend thereof.

27. The process of claim 20 , wherein the composition further comprises at least one modifier of the impact strength selected from the group consisting of ethylene-propylene optionally grafted with maleic anhydride, ethylene-propylene-diene terpolymer optionally grafted with maleic anhydride, styrene-maleic anhydride, ultra-low-density polyethylene, linear low density polyethylene, styrene-butadiene compounds, styrene-ethylene-butadiene-styrene compounds, polypropylene, acrylic elastomers, copolymers and terpolymers of ethylene with acrylic or methacrylic derivatives and/or with vinyl acetate, ionomers, acrylonitrile-butadiene-styrene terpolymer, and acrylic-styrene-acrylonitrile terpolymer.

28. The process of claim 20 , wherein the article is formed by an extrusion process, a molding process, or an injection process.