Composite materials comprising a reinforcing material and a thermoplastic matrix, precursor compound article of said materials and products obtained using same

1. A precursor article of a composite material comprising a multiaxial woven fabric, the fabric including at least a reinforcing layer and a polymeric layer, wherein:

said reinforcing layer comprises at least one reinforcing yarn and/or fibers;

said polymer layer comprising a polymeric matrix yarn and/or fibers, distinct from the reinforcing yarn and/or fibers;

said reinforcing yarn and/or fibers are made of reinforcing material and optionally include a part made of thermoplastic polymer;

said polymeric-matrix yarn and/or fibers are made of a thermoplastic polymer,

said thermoplastic polymer of said reinforcing yarn and/or fibers and of said polymeric-matrix yarn and/or fibers comprises at least one polycondensate consisting of:

30 to 100 mol %, limits inclusive, of macromolecular chains satisfying the following formula (I):

R 3 —(X—R 2 —Y) n —X—R 1 —X—(Y—R 2 —X) m —R 3   (I)

0 to 70 mol %, limits inclusive, of macromolecular chains satisfying the following formula (II):

R 4 —[Y—R 2 —X] p —R 3   (II)

in which chains:

—X—, —Y— is a radical obtained from the condensation of two reactive functional groups F 1 and F 2 such that:

F 1 is the precursor of the —X— radical and F 2 is the precursor of the —Y— radical, or vice versa,

the functional groups F 1 cannot react together by condensation and

the functional groups F 2 cannot react together by condensation;

R 2 is a branched or unbranched, aliphatic or aromatic hydrocarbon radical containing 2 to 20 carbon atoms;

R 3 , R 4 represents hydrogen, a hydroxyl radical or a hydrocarbon radical;

R 1 is a linear or cyclic, aromatic or aliphatic, hydrocarbon radical containing at least 2 carbon atoms and optionally including heteroatoms; and

n, m and p each represent a number between 30 and 200,

wherein the polycondensate is obtained by melt blending a polyamide obtained by polymerization of lactams and/or amino acids or a polyester obtained by polymerization of lactones and/or hydroxyacids, with a difunctional compound, wherein the difunctional compound comprises at least one of adipic acid, decanoic or sebacic acid, dodecanoic acid, terephthalic acid, isophthalic acid, hexamethylenediamine, methylpentamethylenediamine, 4,4′-diaminodicyclohexylmethane, butanediamine, metaxylylenediamine, 1,3-propanediol, 1,2-ethanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol or polytetrahydrofuran,

wherein, when a polyamide is present in the thermoplastic polymer, said polyamide consists of at least one polyamide of formula A1 having:

30 to 100 mol %, limits inclusive, of macromolecular chains satisfying the following formula (I):

R 3 —(X—R 2 —Y) n X—R 1 —X—(Y—R 2 —X) m —R 3   (I)

0 to 70 mol %, limits inclusive, of macromolecular chains satisfying the following formula (II):

R 4 —[Y—R 2 —X] p —R 3   (II)

in which:

Y is the

radical when X represents the

radical;

Y is the

radical when X represents the

radical;

R 2 is a branched or unbranched, aliphatic or aromatic, hydrocarbon radical containing 2 to 20 carbon atoms;

R 3 , R 4 represents hydrogen, a hydroxyl radical or a hydrocarbon radical comprising a

group;

R 5 represents hydrogen or a hydrocarbon radical containing 1 to 6 carbon atoms;

R 1 is a linear or cyclic, aromatic or aliphatic, hydrocarbon radical containing at least 2 carbon atoms and optionally including heteroatoms; and

n, m and p each represent a number between 30 and 200.

2. The article as claimed in claim 1 , wherein the thermoplastic polymer comprises at least one polyamide A1.

3. The article as claimed in claim 1 , wherein the thermoplastic polymer comprises at least one polyester A2 consisting of:

30 to 100 mol %, limits inclusive, of macromolecular chains satisfying the following formula (I):

R 3 —(X—R 2 —Y) n —X—R 1 —X—(Y—R 2 —X) m —R 3   (I)

0 to 70 mol %, limits inclusive, of macromolecular chains satisfying the following formula (II):

R 4 —[Y—R 2 —X] p —R 3   (II)

in which chains:

Y is the —O— radical when X represents the

radical;

Y is the

radical when X represents the —O— radical;

R 2 is a branched or unbranched, aliphatic or aromatic, hydrocarbon radical containing 2 to 20 carbon atoms;

R 3 , R 4 represents hydrogen, a hydroxyl radical or a hydrocarbon radical; comprising a

or —O— group;

R 1 is a linear or cyclic, aromatic or aliphatic, hydrocarbon radical containing at least 2 carbon atoms and optionally including heteroatoms; and

n, m and p each represent a number between 30 and 200.

4. The article as claimed in claim 1 , wherein n, m and p are 30 to 150.

5. The article as claimed in claim 1 , wherein the thermoplastic polymer comprises at least one polyamide A1 or at least one polyester A2,

wherein the at least one polyamide A1 consists of:

30 to 100 mol %, limits inclusive, of macromolecular chains satisfying the following formula (I):

R 3 —(X—R 2 —Y) n —X—R 1 —X—(Y—R 2 —X) m —R 3   (I)

0 to 70 mol %, limits inclusive, of macromolecular chains satisfying the following formula (II):

R 4 —[Y—R 2 —X] p —R 3   (II)

in which:

Y is the

radical when X represents the

radical;

Y is the

radical when X represents the

radical;

R 2 is a branched or unbranched, aliphatic or aromatic, hydrocarbon radical containing 2 to 20 carbon atoms;

R 3 , R 4 represents hydrogen, a hydroxyl radical or a hydrocarbon radical comprising a

group;

R 5 represents hydrogen or a hydrocarbon radical containing 1 to 6 carbon atoms;

R 1 is a linear or cyclic, aromatic or aliphatic, hydrocarbon radical containing at least 2 carbon atoms and optionally including heteroatoms; and

n, m and p each represent a number between 30 and 200;

wherein the at least one polyester A2 consists of:

30 to 100 mol %, limits inclusive, of macromolecular chains satisfying the following formula (I):

R 3 —(X—R 2 —Y) n —X—R 1 —X—(Y—R 2 —X) m —R 3   (I)

0 to 70 mol %, limits inclusive, of macromolecular chains satisfying the following formula (II):

R 4 —[Y—R 2 —X] p —R 3   (II)

in which chains:

Y is the —O— radical when X represents the

radical;

Y is the

radical when X represents the —O— radical;

R 2 is a branched or unbranched, aliphatic or aromatic, hydrocarbon radical containing 2 to 20 carbon atoms;

R 3 , R 4 represents hydrogen, a hydroxyl radical or a hydrocarbon radical comprising a

or —O— group;

R 1 is a linear or cyclic, aromatic or aliphatic, hydrocarbon radical containing at least 2 carbon atoms and optionally including heteroatoms; and

n, m and p each represent a number between 30 and 200.

6. The article as claimed in claim 5 , wherein the polyamide A1 or the polyester A2 comprises at least 45 mol %, of macromolecular chains satisfying formula (I).

7. The article as claimed in claim 1 , wherein R 2 is a pentamethylene radical.

8. The article as claimed in claim 5 , wherein the polyamide A1 or the polyester A2 is obtained by copolymerization from a monomer mixture comprising:

a) a difunctional compound, the reactive functional groups of which are selected from the group consisting of amines, carboxylic acids, alcohols and derivatives thereof, the reactive functional groups being identical;

b) monomers of the following general formulae (III a ) and (III b ) in the case of the polyamide A1:

b′) monomers of the following general formulae (III a ′) and (III b ′) in the case of the polyester A2:

in which formulae:

R′ 2 represents a substituted or unsubstituted, aliphatic, cycloaliphatic or aromatic hydrocarbon radical containing 2 to 20 carbon atoms and optionally including heteroatoms;

Y′ is an amine radical when X′ represents a carboxylic radical, or Y′ is a carboxylic radical when X′ represents an amine radical, in the case of the polyamide A1; and

Y′ is a hydroxyl radical when X′ represents a carboxylic radical, or Y′ is a carboxylic radical when X′ represents a hydroxyl radical, in the case of the polyester A2.

9. The article as claimed in claim 8 , wherein compound a) represents 0.1 to 2 mol % relative to the number of moles of monomers of type b) or b′).

10. The article as claimed in claim 8 , wherein the difunctional compound represents 0.05 to 2% by weight relative to the weight of polyamide or polyester.

11. The article as claimed in claim 5 , wherein the polyamide A1 or the polyester A2 is obtained by melt blending a polyamide obtained by polymerization of lactams and/or amino acids or a polyester obtained by polymerization of lactones and/or hydroxyacids, with a compound of formula (V):

G-R-G  (V)

in which:

R is a substituted or unsubstituted, linear or cyclic, aromatic or aliphatic hydrocarbon radical optionally including heteroatoms; and

G is a functional group or a radical that may react selectively either with the amine reactive functional groups, or with the alcohol reactive functional groups, or with the carboxylic acid reactive functional groups of the polyamide or of the polyester, in order to form covalent bonds.

12. The article as claimed in claim 11 , wherein the compound of formula (V) represents 0.05 to 2% by weight relative to the weight of polyamide or polyester.

13. The article as claimed in claim 1 , further comprising at least one matrix yarn and/or fibers made of a linear thermoplastic polymer.

14. The article as claimed in claim 13 , wherein the linear polymer is an aliphatic and/or semicrystalline polyamide or copolyamide which is nylon-4,6, nylon-6, nylon-6,6, nylon-6,9, nylon-6,10, nylon-6,12, nylon-6,36, nylon-11, nylon-12, a semicrystalline semiaromatic polyamide, a copolyamide, or a polyphthalamides.

15. The article as claimed in claim 1 , wherein the matrix yarns and/or fibers further comprise additives, which are flame retardants, plasticizers, heat and light stabilizers, waxes, pigments, nucleating agents, antioxidants, or impact strength modifiers.

16. The article as claimed in claim 1 , wherein the reinforcing yarns and/or fibers are carbon, glass, aramid, polyimide yarns or fibers.

17. The article as claimed in claim 1 , wherein the reinforcing yarns and/or fibers are natural yarns, fibers, sisal, hemp or flax yarns.

18. The article as claimed in claim 1 , further comprising a matrix precursor powder material.

19. The article as claimed in claim 18 , wherein said matrix precursor powder material is a polyamide.

20. A composite, made by at least partial melting of the matrix yarns and/or fibers of an article as defined in claim 1 .

21. The composite as claimed in claim 20 , having a reinforcement content of between 25 and 80% by weight.

22. A process for the fabrication of a semifinished product, comprising the step of thermoforming or calendering the article as defined in claim 1 , in order to at least partially melt the matrix yarns and/or fibers so as to impregnate the reinforcing yarns and/or fibers.

23. A process for the fabrication of a finished product, comprising the step of thermoforming the article as defined in claim 1 , to a final shape, in order to at least partially melt the matrix yarns and/or fibers so as to impregnate the reinforcing yarns and/or fibers.

24. The article as claimed in claim 1 , wherein said reinforcing yarn and/or fibers further comprise a part made of thermoplastic polymer.

25. The article as claimed in claim 24 , wherein said thermoplastic polymer of said reinforcing yarn and/or fiber comprises said at least one polycondensate.

26. The article as claimed in claim 5 , wherein the polyamide A1 or the polyester A2 comprises at least 60 mol % of macromolecular chains satisfying formula (I).

27. The article as claimed in claim 1 , wherein R 1 is a linear or cyclic, aromatic or aliphatic, hydrocarbon radical containing at least 2 carbon atoms.

28. The article as claimed in claim 5 , wherein R 1 is a linear or cyclic, aromatic or aliphatic, hydrocarbon radical containing at least 2 carbon atoms.