Liquid composition for applications of SMC-moulded thermoplastic composites

1. A liquid composition comprising:

a) a (meth)acrylic polymer,

b) a mixture containing a first (meth)acrylic monomer and a second (meth)acrylic monomer carrying a carboxylic acid function, and

c) a maturation agent selected from a metal oxide or a metal hydroxide,

said liquid composition having a dynamic viscosity of between 10 mPa·s and 10,000 mPa·s at 25° C.,

wherein the (meth)acrylic polymer in the liquid composition is present in proportions of between 10% and 30%, by weight of a total amount of the (meth)acrylic monomer mixture and the (meth)acrylic polymer,

wherein said liquid composition comprises 1% by weight to 10% by weight of the second (meth)acrylic monomer.

2. The liquid composition as claimed in claim 1 , wherein the the (meth)acrylic polymer carries a carboxylic acid function.

3. The liquid composition as claimed in claim 1 , wherein the (meth)acrylic polymer comprises at least 1% by weight of a monomer a carrying a carboxylic acid function.

4. The liquid composition as claimed claim 1 , wherein the second (meth)acrylic monomer carrying the carboxylic acid function is selected from the group consisting of: acrylic acid and methacrylic acid.

5. The liquid composition as claimed in claim 1 , wherein the (meth)acrylic polymer is a block copolymer.

6. The liquid composition as claimed in claim 1 , wherein the weight-average molecular weight of the (meth)acrylic polymer is greater than or equal to 70000 g/mol.

7. The liquid composition as claimed in claim 1 , wherein the maturation agent is selected from the group consisting of: MgO, Mg(OH) 2 , CaO, Ca(OH) 2 , and ZnO.

8. The liquid composition as claimed in claim 1 , wherein said composition comprises at least 1% by weight of said maturation agent.

9. The liquid composition as claimed in claim 1 , wherein said maturation agent is magnesium oxide.

10. The liquid composition as claimed in claim 1 , wherein the composition comprises:

a) from 10% by weight to 30% by weight of (meth)acrylic polymer,

b) from 40% by weight to 90% by weight of the (meth)acrylic monomer mixture,

c) from 0.5 phr to 10 phr of maturation agent.

11. The liquid composition as claimed in claim 1 , wherein said composition comprises:

a) from 10% by weight to 30% by weight of the (meth)acrylic polymer, wherein the (meth)acrylic polymer comprising at least 1% by weight of a monomer which carries a carboxylic acid function,

b) from 40% by weight to 90% by weight of the (meth)acrylic monomer mixture, and

c) from 0.5 phr to 10 phr by weight of maturation agent.

12. The liquid composition as claimed in claim 1 , wherein said composition further comprises additives and/or fillers.

13. The liquid composition as claimed in claim 12 , wherein said filler comprises a mineral filler selected from the group consisting of: calcium carbonate (CaCO3), titanium dioxide (TiO2), aluminum oxide (Al2O3), and silica (SiO2).

14. The liquid composition as claimed in claim 1 , wherein said composition further comprises at least one initiator.

15. The liquid composition as claimed in claim 14 , wherein said composition comprises at least two initiators and in that, at a given temperature, the two initiators have different half-lives.

16. The liquid composition as claimed in claim 15 , wherein, for a given half-life, the difference in the temperature is at least 5 K between the two initiators.

17. A composite material part comprising a fibrous material that has been impregnated with the liquid composition of claim 1 , polymerized formed into a part and polymerized, said part being selected from the group consisting of a motor vehicle part, a boat part, a train part, a sports article, an airplane or helicopter part, a spaceship or rocket part, a photovoltaic module part, a material for construction or building, composite armatures, dowels and calipers for civil engineering and high-rise construction, a wind turbine part, a girder spar cap of a wind turbine blade, a furniture part, a construction or building part, a telephone or cellphone part, a computer or television part, and a printer or photocopier part.

18. The composite material part as claimed in claim 17 , wherein said part is a structural or semistructural part of a vehicle.