Composition (meth)acrylic comprising recycled materials, method of production of said composition and its uses

Abstract

(Method)acrylic composition containing recycled materials, method of production of said composition and its uses. The present invention relates to a (meth)acrylic composition comprising recycled materials, a process for preparing the (meth)acrylic composition and uses of such a (meth)acrylic composition. In particular, the present invention relates to a (meth)acrylic composition comprising a recycled material or recycled materials, said recycled materials being either in polymeric form or in monomer form, or both, a process for preparing the (meth)acrylic composition and uses of such a (meth)acrylic composition.The invention also relates to a polymeric (meth)acrylic composite material, comprising or made of a (meth)acrylic composition comprising recycled materials, a method of preparing such a (meth)acrylic composite material comprising or made of a (meth)acrylic composition comprising recycled materials and an object comprising such a polymeric (meth)acrylic composite material comprising or made of a (meth)acrylic composition comprising recycled materials.

Description

Title of the invention: (Method)acrylic composition COMPRISING RECYCLED MATERIALS, method of production of said composition and its uses technical field

[0001] The present invention relates to a (meth)acrylic composition comprising recycled materials, a process for preparing the (meth)acrylic composition and uses of such a (meth)acrylic composition.

[0002] In particular, the present invention relates to a (meth)acrylic composition comprising a recycled material or recycled materials, said recycled materials being either in polymeric form or in monomer form or both, a process for preparing the (meth)acrylic composition and uses of such a (meth)acrylic composition.

[0003] The invention also relates to a polymeric (meth)acrylic composite material, comprising or made of a (meth)acrylic composition comprising recycled materials, a method of preparing such a (meth)acrylic composite material comprising or made of a (meth)acrylic composition comprising recycled materials and an object comprising such a polymeric (meth)acrylic composite material comprising or made of a (meth)acrylic composition comprising recycled materials. [Technical problem]

[0004] Many materials are reused and / or recycled in order to reduce waste and for reasons of sustainability or sustainable development. These include polymeric materials and composite materials.

[0005] A composite material is a macroscopic combination of two or more immiscible materials. The composite material consists of at least a matrix material, for example a polymeric material, which forms a continuous phase for the cohesion of the structure, and a reinforcing material with various architectures for the mechanical properties.

[0006] The objective when using composite materials is to obtain from the composite material performance characteristics that are not available from its separate constituents if used alone. Therefore, composite materials are widely used in several industrial sectors, such as, for example, construction, automotive, boating or marine, aerospace, transportation, leisure, electronics, and sports, particularly due to their superior mechanical performance (higher tensile strength, higher tensile modulus, and better breaking strength) compared to homogeneous materials and their low density.

[0007] The most important class, in terms of volume on a commercial industrial scale, is that of organic matrix composites, where the matrix material is generally a polymer. The main matrix or continuous phase of a polymeric composite material is either a thermoplastic polymer or a thermosetting polymer.

[0008] One way of preparing a polymeric composite material based on thermoplastic polymers is to use a liquid polymer composition comprising a monomer, commonly called a "syrup". Such a syrup is used to be mixed with a mineral filler or to impregnate the reinforcing material, for example a fibrous substrate, and then polymerized.

[0009] At the end of the use of the object or article comprising the composite material, said object or article must be easily recyclable.

[0010] There is a need for (meth)acrylic compositions and polymeric (meth)acrylic compositions that include recycled raw materials while retaining the same characteristics as (meth)acrylic compositions and polymeric (meth)acrylic compositions without any recycled raw materials. These characteristics include the viscosity of liquid compositions, reactivity, stability, mechanical properties, and thermomechanical properties.

[0011] There is a need for (meth)acrylic compositions and polymeric (meth)acrylic compositions that have a reduced carbon footprint. Preferably, the carbon footprint expressed in CO2 equivalents is less than 3.5 kg / CO2 per kg of (meth)acrylic compositions or polymeric (meth)acrylic compositions, more preferably less than 3 kg / CO2 per kg of (meth)acrylic composition or polymeric (meth)acrylic composition.

[0012] It is also necessary to propose a manufacturing process for (meth)acrylic compositions and polymeric (meth)acrylic compositions with a reduced carbon footprint.

[0013] It is also necessary to propose (meth)acrylic compositions and polymeric (meth)acrylic compositions that are more durable.

[0014] It is also necessary to have a process for preparing (meth)acrylic composite materials with a reduced carbon footprint.

[0015] Another objective of the present invention is to propose a method for manufacturing a polymeric (meth)acrylic composite material with a reduced carbon footprint, recyclable and comprising already recycled raw materials. [BACKGROUND OF THE INVENTION] Prior art

[0016] Document WO2013 / 056845 describes a composite material obtained by in situ polymerization of thermoplastic (meth)acrylic resins. The composite material A polymeric material obtained by in-situ polymerization of a thermoplastic (meth)acrylic resin and a fibrous material containing long fibers, and its use; a process for manufacturing such a composite material; and a manufactured mechanical or structured part or article comprising this polymeric composite material. The document contains no information on the use of recycled materials or the reduction of carbon footprint.

[0017] Document WO2014 / 013028 describes a process for impregnating a fibrous substrate, a liquid (meth)acrylic syrup for the impregnation process, its polymerization method, and a resulting structured article. The liquid (meth)acrylic syrup comprises a (meth)acrylic polymer, a (meth)acrylic monomer, and at least one initiator or initiation system for starting the polymerization of the (meth)acrylic monomer. The document makes no mention of the use of recycled materials or the reduction of the carbon footprint.

[0018] None of the cited prior art discloses a liquid (meth)acrylic syrup having a recycled content of at least 1% by weight or comprising a raw material that has been recycled. [Brief description of the invention]

[0019] Surprisingly, it has been observed that a (meth)acrylic MCI composition comprising:

[0020] (a) 100 parts by weight of a liquid (meth)acrylic syrup having recycled content of at least 1% by weight, comprising:

[0021] (ai) from 1% by weight to 50% by weight of one or more PI (meth)acrylic polymers, and

[0022] (a2) from 50% by weight to 99% by weight of one or more monomers (meth)acrylic Ml, each monomer Ml comprising only one (meth)acrylic function per monomer,

[0023] (b) possibly from 0.01 parts by weight to 5 parts by weight of a po initiator Lymerization,

[0024] (c) possibly between 100 ppm and 10,000 ppm of an accelerator,

[0025] makes it possible to provide a composition for the preparation of (meth)acrylic polymeric compositions and (meth)acrylic composite materials which has the same characteristics as (meth)acrylic compositions and polymeric (meth)acrylic compositions without any recycled raw materials, while having a reduced carbon footprint.

[0026] Surprisingly, it was also found that a (meth)acrylic MCI composition comprising:

[0027] (a) 100 parts by weight of a liquid (meth)acrylic syrup having recycled content of at least 1% by weight, comprising:

[0028] (aO of 1% by weight to 50% by weight of one or more (meth)acrylic PI polymers, and

[0029] (a2) from 50% by weight to 99% by weight of one or more monomers (meth)acrylic Ml, each monomer Ml comprising only one (meth)acrylic function per monomer,

[0030] (b) from 0.01 parts by weight to 5 parts by weight of a polymerization initiator,

[0031] (c) between 100 ppm and 10,000 ppm of an accelerator

[0032] makes it possible to provide a composition for the preparation of a polymeric (meth)acrylic composition MPC1 and a polymeric (meth)acrylic composite material MPCM1 which has the same characteristics as (meth)acrylic compositions and polymeric (meth)acrylic compositions without any recycled raw material, which has a reduced carbon footprint, which polymerizes and which, once polymerized, gives compositions which are recyclable.

[0033] Surprisingly, it was also found that a (meth)acrylic MCI composition comprising:

[0034] (a) 100 parts by weight of a liquid (meth)acrylic syrup having recycled content of at least 1% by weight, comprising:

[0035] (ai) from 1% by weight to 50% by weight of one or more PI (meth)acrylic polymers, and

[0036] (a2) from 50% by weight to 99% by weight of one or more monomers (meth)acrylic Ml, each monomer Ml comprising only one (meth)acrylic function per monomer,

[0037] (b) from 0.01 parts by weight to 5 parts by weight of a polymerization initiator

[0038] (c) between 100 ppm and 10,000 ppm of an accelerator;

[0039] makes it possible to provide a composition for the preparation of polymeric (meth)acrylic compositions MPC1 and polymeric (meth)acrylic composite materials MPCM1 which has the same characteristics as (meth)acrylic compositions and polymeric (meth)acrylic compositions without any recycled raw material, while also having a reduced food carbon footprint.

[0040] Surprisingly, a process has been found for preparing an MCI (meth)acrylic composition, said process comprising the following steps:

[0041] (i) the supply of a PI (meth)acrylic polymer and monomers (meth)acrylics Ml of which at least one of them has a recycled content of 100%,

[0042] (ii) the preparation of 100 parts by weight of (a) a liquid (meth)acrylic syrup having a recycled content of at least 1% by weight, comprising:

[0043] (ai) from 1% by weight to 50% by weight of one or more PI (meth)acrylic polymers, and

[0044] (a2) from 50% by weight to 99% by weight of one or more monomers (meth)acrylic Ml, each monomer Ml comprising only one (meth)acrylic function per monomer,

[0045] by mixing components (al) and (a2),

[0046] iii) the optional supply of 0.01 parts by weight to 5 parts by weight of a polymerization initiator

[0047] iv) the possible supply of between 100 ppm and 10,000 ppm of an accelerator;

[0048] gives a composition for the preparation of polymeric (meth)acrylic compositions MPC1 and polymeric (meth)acrylic composite materials MPCM1 which has the same characteristics as (meth)acrylic compositions and polymeric (meth)acrylic compositions without any recycled raw material, while having a reduced carbon footprint. Description of the implementation methods

[0049] According to a first aspect, the present invention relates to an MCI (meth)acrylic composition, said composition comprising:

[0050] (a) 100 parts by weight of a liquid (meth)acrylic syrup having recycled content of at least 1% by weight comprising:

[0051] (aO of 1% by weight to 50% by weight of one or more (meth)acrylic PI polymers, and

[0052] (a2) from 50% by weight to 99% by weight of one or more monomers (meth)acrylic Ml, each monomer Ml comprising only one (meth)acrylic function per monomer,

[0053] (b) possibly from 0.01 parts by weight to 5 parts by weight of a po initiator Lymerization

[0054] (c) possibly between 100 ppm and 10,000 ppm of an accelerator.

[0055] According to a second aspect, the present invention relates to an MCI (meth)acrylic composition, said composition comprising:

[0056] (a) 100 parts by weight of a liquid (meth)acrylic syrup having recycled content of at least 1% by weight comprising:

[0057] (ai) from 1% by weight to 50% by weight of one or more PI (meth)acrylic polymers, and

[0058] (a2) from 50% by weight to 99% by weight of one or more monomers (meth)acrylic Ml, each monomer Ml comprising only one (meth)acrylic function per monomer,

[0059] (b) from 0.01 parts by weight to 5 parts by weight of a polymerization initiator,

[0060] (c) between 100 ppm and 10,000 ppm of an accelerator.

[0061] According to a third aspect, the present invention relates to a preparation method of a (meth)acrylic MCI composition comprising the following steps:

[0062] (i) the supply of a PI (meth)acrylic polymer and monomers (meth)acrylics Ml of which at least one of them has a recycled content of 100%,

[0063] (ii) the preparation of 100 parts by weight of (a) a liquid (meth)acrylic syrup having a recycled content of at least 1% by weight, comprising:

[0064] (aO of 1% by weight to 50% by weight of one or more (meth)acrylic PI polymers, and

[0065] (a2) from 50% by weight to 99% by weight of one or more monomers (meth)acrylic Ml, each monomer Ml comprising only one (meth)acrylic function per monomer,

[0066] by mixing components (al) and (a2),

[0067] (iii) the optional supply of 0.01 parts by weight to 5 parts by weight of a polymerization initiator

[0068] iv) the supply, if necessary, of between 100 ppm and 10,000 ppm of an accelerator,

[0069] (v) the mixing of the components.

[0070] According to a fourth aspect, the present invention relates to a process for preparing a (meth)acrylic MCI composition, the process comprising the following steps:

[0071] (i) the supply of 100 parts by weight of (a) a liquid (meth)acrylic syrup having recycled content of at least 1% by weight, including:

[0072] (aO of 1% by weight to 50% by weight of one or more PI (meth)acrylic polymers, and

[0073] (a2) from 50% by weight to 99% by weight of one or more monomers (meth)acrylic Ml, each monomer Ml comprising only one (meth)acrylic function per monomer,

[0074] (ii) the supply of 0.01 parts by weight to 5 parts by weight of a polymerization initiator

[0075] (iii) the supply of between 100 ppm and 10,000 ppm of an accelerator,

[0076] (iv) the mixture of the components.

[0077] According to a fifth aspect, the present invention relates to the use of an MCI (meth)acrylic composition to prepare an MPC1 (meth)acrylic polymeric material or an MPCM1 (meth)acrylic polymeric composite material, said MCI (meth)acrylic composition comprising:

[0078] (a) 100 parts by weight of a liquid (meth)acrylic syrup comprising:

[0079] (ai) from 1% by weight to 50% by weight of one or more PI (meth)acrylic polymers, and

[0080] (a2) from 50% by weight to 99% by weight of one or more monomers (meth)acrylics Ml, each monomer Ml comprising only one function (meth)acrylic per monomer

[0081] (b) from 0.01 parts by weight to 5 parts by weight of a polymerization initiator,

[0082] (c) between 100 ppm and 10,000 ppm of an accelerator.

[0083] According to a sixth aspect, the present invention relates to a (meth)acrylic polymeric material MPC1 or a (meth)acrylic polymeric composite material MPCM1 prepared by polymerization of the (meth)acrylic composition MCI.

[0084] According to a seventh aspect, the present invention relates to a process for preparing a polymeric (meth)acrylic material MPC1, said process comprising the following steps:

[0085] (i) the supply of an MCI (meth)acrylic composition according to the first or the second aspect,

[0086] (ii) the polymerization of the (meth)acrylic composition MCI.

[0087] According to an eighth aspect, the present invention relates to a process for preparing a polymeric (meth)acrylic composite material MPCM1, said process comprising the following steps: i. the supply of a (meth)acrylic MCI composition according to the first or second aspect, ii. contacting the (meth)acrylic MCI composition with a reinforcing material, (iii) polymerization of the (meth)acrylic MCI composition.

[0088] The term “(meth)acrylic monomer” covers both an acrylic monomer and a methacrylic monomer. Similarly, the term "(meth)acrylic polymer" covers not only an acrylic homopolymer but also a methacrylic homopolymer, an acrylic copolymer and a methacrylic copolymer.

[0089] The term “PMMA”, in the present context, refers to homo- and copolymers of methyl methacrylate (MMA), for the MMA copolymer the weight ratio of MMA inside the PMMA is at least 50% by weight.

[0090] The term "initiator", in the present context, refers to a chemical species that forms a compound or an intermediate compound that starts the polymerization of a monomer, which is capable of successively linking a large number of other monomers in a polymeric compound.

[0091] The term “polymer composite”, in the present context, refers to a multicomponent material comprising several different phase domains in which at least one type of phase domain is a continuous phase and in which at least one component is a polymer.

[0092] The term “thermoplastic”, in this context, refers to a polymer that becomes liquid or becomes more liquid or less viscous when heated and that can take on new shapes through the application of heat and possibly pressure. This also applies to slightly cross-linked thermoplastic polymers that can be thermoformed when heated above their softening temperature.

[0093] The term "recycled" as used in the present invention means either a polymer, a monomer, or both, that are not virgin materials. The polymer may be a production by-product or waste, particularly polymer waste, while the monomer is regenerated by thermochemical recycling of polymer waste. Polymer waste may be post-industrial or post-consumer waste. Post-consumer waste of a material is waste generated by a customer of a substrate containing the material. Post-industrial waste is waste generated during a product production process that has not been used on the consumer market.

[0094] The term "recycled content" as used herein means the mass proportion of material resulting from recycled material.

[0095] By "carbon footprint" we mean the weighted sum of greenhouse gas emissions and greenhouse gas removals of a process, a system of processes or a system of products, expressed in CO2 equivalents.

[0096] By specifying that a range goes from x to y in the present invention, this means that the upper and lower limits of this range are included, which is equivalent to at least x and up to y.

[0097] By specifying that a range is between x and y in the present invention, this means that the upper limit and the lower limit of this range are excluded, which is equivalent to more than x and less than y.

[0098] The liquid (meth)acrylic syrup (a) of the composition according to the invention comprises (ai) a (meth)acrylic polymer PI and (a2) a (meth)acrylic monomer M1, and the liquid (meth)acrylic syrup has a recycled content of at least 1% by weight. The recycled content of at least 1% by weight is derived from either the (meth)acrylic polymer PI, the (meth)acrylic monomer M1, or both.

[0099] The liquid (meth)acrylic syrup (a) according to the (meth)acrylic MCI composition of the invention comprises between 1% by weight and 50% by weight of a (meth)acrylic PI polymer and between 50% by weight and 99% by weight of a (meth)acrylic ML monomer

[0100] Preferably, the liquid (meth)acrylic syrup (a) comprises between 2% by weight and 50% by weight of a (meth)acrylic PI polymer and between 50% by weight and 98% by weight of a (meth)acrylic Ml monomer, more preferably between 2% by weight and 40% by weight of a (meth)acrylic PI polymer and between 60% by weight and 98% by weight of a (meth)acrylic Ml monomer, even more preferably between 3% in weight and 40% by weight of a (meth)acrylic PI polymer and between 60% by weight and 97% by weight of a (meth)acrylic Ml monomer, advantageously between 3% by weight and 35% by weight of a (meth)acrylic PI polymer and between 65% by weight and 97% by weight of a (meth)acrylic Ml monomer and more advantageously between 3% by weight and 30% by weight of a (meth)acrylic PI polymer and between 70% by weight and 97% by weight of a (meth)acrylic Ml monomer.

[0101] The dynamic viscosity of the liquid (meth)acrylic syrup is in the range of 10 mPa*s to 10,000 mPa*s, preferably from 20 mPa*s to 7,000 mPa*s, and advantageously from 20 mPa*s to 5,000 mPa*s, and more advantageously from 20 mPa*s to 2,000 mPa*s, and even more advantageously between 20 mPa*s and 1,000 mPa*s. The viscosity of the syrup can easily be measured with a rheometer or a viscometer. The dynamic viscosity is measured at 25 °C. If the liquid (meth)acrylic syrup exhibits Newtonian behavior, meaning that it does not thin under shear, the dynamic viscosity is independent of shear in a rheometer or of the velocity of the moving part in a viscometer. If the liquid composition has non-Newtonian behavior, meaning that it exhibits fluidization under shear, the dynamic viscosity is measured at a shear rate of 1 s⁻¹ at 25 °C.

[0102] With regard to the liquid (meth)acrylic syrup (a), it comprises (ai) the (meth)acrylic monomer Ml and (a2) the (meth)acrylic polymer PL. After polymerization of the (meth)acrylic composition MCI, the (meth)acrylic monomer Ml possibly polymerizes with other (meth)acrylic monomers and is transformed into a (meth)acrylic polymer P2 comprising the monomeric units of the (meth)acrylic monomer Ml and other possible comonomers.

[0103] The liquid (meth)acrylic syrup of the (meth)acrylic MCI composition according to the invention may comprise only one (meth)acrylic PI polymer, but may equivalently comprise a mixture of two, three, or even more (meth)acrylic PI polymers. If there is a mixture of different (meth)acrylic PI polymers, the difference is the composition of the respective (meth)acrylic PI polymer, or the molecular weight of the respective (meth)acrylic PI polymer, or both.

[0104] The (meth)acrylic PI polymer or each of the (meth)acrylic PI polymers included in the liquid (meth)acrylic syrup may in particular be selected from:

[0105] . alkyl poly(acrylate)s which comprise alkyl acrylate homopolymers and alkyl acrylate copolymers, and

[0106] . poly(alkyl methacrylate) comprising homopolymers of me alkyl methacrylate and alkyl methacrylate copolymers.

[0107] According to a preferred embodiment, the (meth)acrylic polymer PI or each of the (meth)acrylic polymers PI is a poly(methyl methacrylate) (PMMA), it being understood that, as noted above, poly(methyl methacrylate) (PMMA) can refer to a homopolymer of methyl methacrylate (MMA) or a copolymer of MMA.

[0108] In particular, in the case where the liquid (meth)acrylic syrup comprises a mixture of two or more poly(methyl methacrylate) PI, this mixture can be formed by mixing at least two homopolymers of MMA having a different molecular weight, by mixing at least two copolymers of MMA having an identical monomer composition and a different molecular weight, by mixing at least two copolymers of MMA having a different monomer composition, or by mixing at least one homopolymer of MMA and at least one copolymer of MMA.

[0109] According to a first preferred embodiment, the (meth)acrylic PI polymer is chosen from a methyl methacrylate homopolymer and a methyl methacrylate copolymer and a corresponding mixture, the methyl methacrylate advantageously representing at least 50% by weight of the (meth)acrylic PI polymer or of each of the (meth)acrylic PI polymers.

[0110] According to one embodiment of the invention, methyl methacrylate represents at least 55% by weight of the (meth)acrylic PI polymer or of each of the (meth)acrylic PI polymers.

[0111] According to another particular embodiment, the (meth)acrylic PI polymer or each of the (meth)acrylic PI polymers comprises at least 70%, advantageously at least 80%, preferably at least 90% and more preferably at least 95% by weight of methyl methacrylate.

[0112] When the (meth)acrylic PI polymer or each of the (meth)acrylic PI polymers is a methyl methacrylate (MMA) copolymer, it may comprise a comonomer containing at least one ethylenic unsaturation and capable of copolymerizing with methyl methacrylate. Among these monomers, mention may be made in particular of acrylic and methacrylic acids and alkyl (meth)acrylates in which the alkyl group contains from 1 to 12 carbon atoms. The term "alkyl (meth)acrylates" means an alkyl ester of acrylic acid or methacrylic acid. Examples of comonomers include methyl acrylate and ethyl, butyl, or 2-ethylhexyl (meth)acrylate.

[0113] Advantageously, the (meth)acrylic PI polymer or each of the (meth)acrylic PI polymers is a homopolymer of methyl methacrylate or a copolymer of methyl methacrylate and an alkyl acrylate or an alkyl methacrylate in which the alkyl group contains from 1 to 12 carbon atoms, advantageously from 1 to 6 carbon atoms and preferably from 1 to 4 atoms of carbon.

[0114] According to a first preferred embodiment, when the (meth)acrylic PI polymer or each of the (meth)acrylic PI polymers is a methyl methacrylate (MMA) copolymer, this methyl methacrylate (MMA) copolymer comprises from 70% to 99.9%, advantageously from 80% to 99.9%, preferably from 90% to 99.9% and more preferably from 95% to 99.9% by weight of methyl methacrylate and from 0.1% to 30%, advantageously from 0.1% to 20%, preferably from 0.1% to 10% and more preferably from 0.1% to 5% by weight of at least one monomer containing at least one ethylenic unsaturation which can copolymerize with methyl methacrylate. Preferably the comonomer or each comonomer is chosen from methyl acrylate and ethyl acrylate.

[0115] In an advantageous variant of the first preferred embodiment, when the (meth)acrylic PI polymer or each of the (meth)acrylic PI polymers is a methyl methacrylate (MMA) copolymer, the (meth)acrylic PI polymer is a methyl methacrylate and alkyl acrylate copolymer.

[0116] In a preferred embodiment of the first preferred embodiment, when the (meth)acrylic PI polymer or each of the (meth)acrylic PI polymers is a methyl methacrylate (MMA) copolymer, the (meth)acrylic PI polymer is a methyl methacrylate and methyl acrylate or ethyl acrylate copolymer.

[0117] According to a second preferred embodiment, when the (meth)acrylic PI polymer or each of the (meth)acrylic PI polymers is a methyl methacrylate (MMA) copolymer, this methyl methacrylate (MMA) copolymer comprises from 50% to 99.9%, advantageously from 52% to 99.9%, preferably from 53% to 99.9% and more preferably from 55% to 99.9% by weight of methyl methacrylate and from 0.1% to 50%, advantageously from 0.1% to 48%, preferably from 0.1% to 47% and more preferably from 0.1% to 45% by weight of at least one monomer containing at least one ethylenic unsaturation which can copolymerize with methyl methacrylate. Preferably, the comonomer or each comonomer is chosen from methyl acrylate, ethyl acrylate, ethyl methacrylate, propyl acrylate, propyl (meth)acrylate, butyl acrylate and butyl methacrylate.

[0118] The weight-average molecular weight, denoted Mw, of the (meth)acrylic PI polymer or of each of the (meth)acrylic PI polymers is generally high and can therefore be greater than 40,000 g / mol, advantageously greater than 45,000 g / mol and preferably greater than 50,000 g / mol. The weight-average molecular weight can be measured by size-exclusion chromatography (SEC).

[0119] The (meth)acrylic PI polymer, if not crosslinked, usually has an index melt flow rate (MFR) according to ISO 1133-2:2011 (230 °C / 3.8 kg) between 0.1 g / 10 min and 20 g / 10 min or the melt flow rate index is between 0.2 g / 10 min and 18 g / 10 min, or between 0.3 g / 10 min and 16 g / 10 min or between 0.4 g / 10 min and 13 g / 10 min.

[0120] The liquid (meth)acrylic syrup of the (meth)acrylic MCI composition according to the invention may comprise only one (meth)acrylic monomer Ml, but may equivalently comprise a mixture of two, three (meth)acrylic monomers Ml or even more. This would be a methacrylic monomer Ml a, a methacrylic monomer Mlb, (meth)acrylic monomers Mlc, etc.

[0121] If the liquid (meth)acrylic syrup comprises one or more (meth)acrylic monomers Ml, the (meth)acrylic monomer Ml or each (meth)acrylic monomer Ml comprises only one (meth)acrylic function per monomer.

[0122] With regard to the (meth)acrylic monomer Ml, the monomer is selected from alkylacrylic monomers, alkylmethacrylic monomers, hydroxyalkylacrylic monomers, and hydroxyalkylmethacrylic monomers, and mixtures thereof. The terms "alkylacrylic monomer" or "alkylmethacrylic monomer" mean an alkyl ester of acrylic acid or methacrylic acid.

[0123] Preferably, the (meth)acrylic monomer Ml is selected from hydroxyalkylacrylic monomers, hydroxyalkylmethacrylic monomers, alkylacrylic monomers, alkylmethacrylic monomers and mixtures thereof, the alkyl group containing from 1 to 22 linear, branched or cyclic carbons; the alkyl group preferably containing from 1 to 12 linear, branched or cyclic carbons.

[0124] Advantageously, the (meth)acrylic monomer Ml is selected from methyl methacrylate, ethyl methacrylate, methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, n-butyl methacrylate, isobutyl methacrylate, cyclohexyl acrylate, cyclohexyl methacrylate, isobornyl acrylate, isobornyl methacrylate, hydroxyethyl acrylate and hydroxyethyl methacrylate, and mixtures thereof.

[0125] According to a preferred embodiment, at least 50% by weight and preferably at least 60% by weight of the (meth)acrylic monomer Ml is methyl methacrylate.

[0126] According to a first more preferred embodiment, at least 50% by weight, preferably at least 60% by weight, more preferably at least 70% by weight, advantageously at least 80% by weight and even more advantageously 90% by weight of the monomer Ml is a mixture of methyl methacrylate with optionally at least one other monomer.

[0127] According to a second, more preferred embodiment, the monomer Ml is methyl methacrylate.

[0128] In a first embodiment of the invention, the liquid (meth)acrylic syrup comprises:

[0129] (aO from 3% by weight to 45% by weight and preferably from 3% by weight to 40% by weight of the (meth)acrylic PI polymer(s), and

[0130] (a2) from 55% by weight to 97% by weight and preferably from 60% by weight to 97% in weight of the (meth)acrylic monomer(s) Ml.

[0131] In a second embodiment of the invention, the liquid (meth)acrylic syrup comprises:

[0132] (aO of 10% by weight to 35% by weight and preferably of 12% by weight to 35% by weight and more preferably of 15% by weight to 30% by weight and even more preferably of 20% by weight to 30% by weight of the (meth)acrylic PI polymer(s), and

[0133] (a2) from 65% by weight to 90% by weight and preferably from 65% by weight to 88% in weight and more preferably from 70% in weight to 85% in weight and even more preferably from 70% in weight to 80% in weight of the (meth)acrylic monomer(s) Ml.

[0134] In an advantageous embodiment, the (meth)acrylic polymer PI or each (meth)acrylic polymer PI and the (meth)acrylic monomer Ml or each (meth)acrylic monomer Ml of the (meth)acrylic liquid syrup comprise at least one of the same (meth)acrylic motif, such a embodiment making it possible to optimize the solubility of the (meth)acrylic polymer(s) PI in the (meth)acrylic monomer(s) Ml.

[0135] Preferably, the (meth)acrylic PI polymer or each (meth)acrylic PI polymer is selected from a homopolymer of methyl methacrylate or copolymer of methyl methacrylate and methyl acrylate and a copolymer of methyl methacrylate and ethyl acrylate or a copolymer of methyl methacrylate and butyl acrylate or a copolymer of methyl methacrylate and butyl methacrylate, the respective comonomer being present at most 45% by weight in the copolymer.

[0136] Preferably, the (meth)acrylic monomer Ml is methyl methacrylate.

[0137] In a first advantageous embodiment, the liquid (meth)acrylic syrup comprises a PI (meth)acrylic polymer, rather than a mixture of PI (meth)acrylic polymers.

[0138] In a second advantageous embodiment, the liquid (meth)acrylic syrup comprises a mixture of two PI (meth)acrylic polymers.

[0139] In another advantageous embodiment, the liquid (meth)acrylic syrup comprises a (meth)acrylic monomer Ml, rather than a mixture of (meth)acrylic monomers Ml.

[0140] Stabilizers, or reaction inhibitors, may also be present in liquid (meth)acrylic syrup to prevent spontaneous polymerization of the (meth)acrylic monomer(s) Ml.

[0141] These stabilizers can in particular be selected from hydroquinone (HQ), hydroquinone monomethyl ether (HQME), 2,6-di-tert-butyl-4-methylphenol (BHT), 2,6-di-tert-butyl-4-methoxyphenol (Topanol O) and 2,4-dimethyl-6-tert-butylphenol (Topanol A).

[0142] These stabilizers may be present in the liquid (meth)acrylic syrup in a proportion not exceeding 5 parts by weight, advantageously not exceeding 4 parts by weight and preferably in a proportion between 0.3 and 3 parts by weight, for 100 parts by weight of the sum of the (meth)acrylic polymer(s) PI and the (meth)acrylic monomer(s) Ml.

[0143] With regard to the recycled content of at least 1% by weight, it may come from either the (meth)acrylic polymer PI, or the (meth)acrylic monomer Ml, or both. The recycled content is expressed on the basis of the sum of components (ai) and (a2) of the liquid (meth)acrylic syrup.

[0144] In a first preferred embodiment, the recycled content is at least 10% by weight.

[0145] In a second preferred embodiment, the recycled content is at least 20% by weight.

[0146] In a third preferred embodiment, the recycled content is at least 50% by weight.

[0147] In a fourth preferred embodiment, the recycled content is between 15% by weight and 100% by weight.

[0148] In a fifth preferred embodiment, the recycled content is from 20% by weight to 100% by weight.

[0149] In a sixth preferred embodiment, the recycled content is from 50% by weight to 100% by weight.

[0150] In a seventh preferred embodiment, the recycled content is 100% by weight.

[0151] In an eighth preferred embodiment, the recycled content of the liquid (meth)acrylic syrup comes solely from the (meth)acrylic polymer PI.

[0152] In a ninth preferred embodiment, the recycled content of the liquid (meth)acrylic syrup comes solely from the (meth)acrylic monomer Ml.

[0153] In a tenth preferred embodiment, the recycled content of the liquid (meth)acrylic syrup comes from the (meth)acrylic polymer PI and the (meth)acrylic monomer Ml.

[0154] In an eleventh preferred embodiment, the (meth)acrylic polymer PI of component (ai) of the liquid (meth)acrylic syrup is only partially recycled. means that from 1% by weight to 50% by weight of one or more PI (meth)acrylic polymers, there is a mixture of at least two PI (meth)acrylic polymers, one being recycled and the other not.

[0155] In a twelfth case, the (meth)acrylic monomer M1 of component (a2) of the liquid (meth)acrylic syrup is only partially recycled. This means that from 50% by weight to 99% by weight of one or more (meth)acrylic monomers M1, there is a mixture of at least two (meth)acrylic monomers M1, one being recycled and the other not.

[0156] The respective preferred embodiments can be combined in any logical combination.

[0157] The (meth)acrylic PI polymer, as a recycled component, is derived from waste, preferably from post-industrial or post-consumer waste.

[0158] The (meth)acrylic monomer Ml as a recycled component is obtained from the depolymerization of a (meth)acrylic polymer comprising the (meth)acrylic monomer ML. In the case where the monomer (Ml) is methyl methacrylate, it is obtained by depolymerization of polymethyl methacrylate (PMMA).

[0159] The (meth)acrylic MCI composition according to one aspect of the invention also comprises a polymerization initiator, the function of which is to ensure the start of the polymerization of the (meth)acrylic ML monomer

[0160] The polymerization initiator can be chosen from organic peroxides, peroxyesters, peroxyacetals and azo-type compounds.

[0161] The polymerization initiator may in particular be chosen from among diacyl peroxides, peroxyesters, peroxydicarbonates, dialkyl peroxides, peroxyacetals, hydroperoxides or peroxyketals.

[0162] In one embodiment, the polymerization initiator is chosen from benzoyl peroxide.

[0163] In another embodiment, the polymerization initiator is selected from diisobutyryl peroxide, cumyl peroxyneodecanoate, di(3-methoxybutyl) peroxydicarbonate, 1,1,3,3-tetramethylbutyl peroxyneodecanoate, cumyl peroxy-neoheptanoate, di-n-propyl peroxydicarbonate, tert-amyl peroxyneodecanoate, di-sec-butyl peroxydicarbonate, diisopropyl peroxydicarbonate, di(4-tert-butylcyclohexyl) peroxydicarbonate, di-(2-ethylhexyl) peroxydicarbonate, tert-amyl peroxyneodecanoate, tert-butyl peroxyneodecanoate, di-n-butyl peroxydicarbonate, peroxydicarbonate dicetyl, dimyristyle peroxydicarbonate, 1,1,3,3-tetramethylbutyl peroxypivalate, tert-butyl peroxyneoheptanoate, tert-amyl peroxypivalate, tert-butyl peroxypivalate, di-(3,5,5-trimethylhexanoyl peroxide), dilauroyl peroxide, didecanoyl peroxide, the 2,5-Dimethyl-2,5-di(2-ethylhexanoylperoxy)hexane, 1,1,3,3-tetramethylbutyl peroxy-2-ethylhexanoate, tert-amyl peroxy-2-ethylhexanoate, dibenzoyl peroxide, tert-butyl peroxy-2-ethylhexanoate, tert-butyl peroxydiethyl acetate, tert-butyl peroxyisobutyrate, the l,l-di-(tert-butylperoxy)-3,3,5-trimethylcyclohexane, the l,l-di(tert-amylperoxy)cyclohexane, l,l-di-(tert-butylperoxy)-cyclohexane, tert-amyl peroxy-2-ethylhexyl carbonate, tert-amyl peroxyacetate, 3,5,5-trimethylhexanoate, 2,2-di-(tert-butylperoxy)-butane, tert-butyl peroxyisopropyl carbonate, tert-butyl peroxy-2-ethylhexyl carbonate, tert-amyl peroxybenzoate, tert-butyl peroxyacetate, butyl 4,4-di(tert-butylperoxy)valerate, tert-butyl peroxybenzoate, di-tert-amyl peroxide, dicumyl peroxide, di-(2-tert-butylperoxyisopropyl)benzene, the 2,5-Dimethyl-2,5-di-(tert-butylperoxy)hexane, tert-butylcumyl peroxide, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexyne-3, di-tert-butyl peroxide, 3,6,9-triethyl-3,6,9-trimethyl-1,4,7-triperoxonane, 2,2'-azobisisobutyronitrile (AIBN), 2,2'-azodi-(2-methylbutyronitrile), razobisobutyramide, the 2,2'-azobis(2,4-dimethylvaleronitrile), l,r-azodi(hexahydrobenzonitrile) or 4,4'-azobis(4-cyanopentanoic acid).

[0164] The (meth)acrylic MCI composition according to the invention may comprise 0.01 parts by weight to 5 parts by weight of polymerization initiator.

[0165] According to a particular embodiment, the (meth)acrylic MCI composition according to the invention comprises from 0.02 parts by weight to 4 parts by weight and advantageously 0.03 parts by weight to 3 parts by weight of polymerization initiator for 100 parts by weight of liquid (meth)acrylic syrup.

[0166] What has just been described for a polymerization initiator is entirely transposable to an initiator system, such as a system consisting of a polymerization initiator and a polymerization activator or accelerator.

[0167] The (meth)acrylic MCI composition according to the invention may also effectively comprise further in certain aspects a polymerization activator or accelerator.

[0168] According to a particular embodiment, the (meth)acrylic composition according to the invention comprises between 100 ppm and 10,000 ppm, advantageously between 100 ppm and 7,000 ppm and preferably between 200 ppm and 5,000 ppm of polymerization activator or accelerator for 100 parts by weight of the (meth)acrylic syrup.

[0169] The present invention also relates to a method for preparing an MCI (meth)acrylic composition.

[0170] According to the invention, this method comprises the following steps: the supply of respective components and iv) the mixture of the components.

[0171] Step iv) of the preparation process according to the invention is carried out by mixing all the components included in the (meth)acrylic MCI composition. In one embodiment, care is taken to first prepare the liquid (meth)acrylic syrup and then to introduce, into this (meth)acrylic syrup where appropriate, the polymerization activator or accelerator, the polymerization initiator being introduced last.

[0172] This mixing can be done manually or using a mixing means.

[0173] Optionally, the mixing is carried out by stirring, and for a duration of between 1 minute and 36 hours, advantageously between 2 minutes and 24 hours, more advantageously between 3 minutes and 24 hours and preferentially between 4 minutes and 24 hours.

[0174] The manufacturing process according to the invention is thus a process which is particularly simple to carry out and which can be easily carried out in current facilities dedicated to the manufacture of a (meth)acrylic composition.

[0175] The (meth)acrylic MCI composition comprising compounds a1) to a2) or other components possibly added has a viscosity between 10 mPa*s and 10,000 mPa*s at 23 °C.

[0176] Preferably, the viscosity of the (meth)acrylic MCI composition comprising compounds a1) to a2) at 23 °C is in a range of 50 mPa*s to 10,000 mPa*s, more preferably from 50 mPa*s to 9,000 mPa*s, even more preferably from 50 mPa*s to 8,000 mPa*s, even more preferably from 50 mPa*s to 7,500 mPa*s, even more preferably between 50 mPa*s and 7,000 mPa*s, advantageously between 50 mPa*s and 6,000 mPa*s and more advantageously between 50 mPa*s and 5,000 mPa*s.

[0177] The process for preparing the (meth)acrylic MCI composition according to any one of the embodiments may optionally further include a step of filtering the liquid (meth)acrylic syrup having a recycled content of at least 1% by weight. The filtration step is preferably carried out before mixing with the polymerization initiator.

[0178] In one embodiment, the reinforcing material is a fibrous substrate.

[0179] In another embodiment, the reinforcing material is a mineral filler.

[0180] The present invention relates, according to a further aspect, to an MPI molded part comprising a polymeric (meth)acrylic composite material MPCM1.

[0181] In a first preferred embodiment, the (meth)acrylic polymeric composite material MPCM1 is a (meth)acrylic polymeric composite material reinforced with fibers.

[0182] In a second preferred embodiment, the polymeric composite material (meth)acrylic MPCM1 is a particle-reinforced (meth)acrylic polymer composite material. [Processes]

[0183] The weight-average molecular weight can be measured by size-exclusion chromatography (SEC). The chromatography column is calibrated with PMMA references having a molecular weight between 402 g / mol and 1,900,000 g / mol. The weight-average molecular weight is expressed in g / mol for the number and average molecular weights Mn and Mw, respectively. For the measurement, the concentration is 1 g / L.

[0184] The viscosity of (meth)acrylic compositions comprising at least components a1) and a2) is measured with a Brookfield viscometer at 23 °C, according to ISO 2555:2018 “Plastics - Resins in liquid state or as emulsions or dispersions - Determination of apparent viscosity by the single-cylinder rotary viscometer method”.

[0185] Stability is measured using the following method. Heat an oven to 90 °C. Pour 200 g of the liquid resin into a bottle. Place the sealed bottle in the oven. Check the sample periodically. A thermocouple may be used to monitor the sample temperature throughout the stability test. The sample is considered "compliant," i.e., stable, if the resin remains liquid after 24 h at 90 °C and if no exothermic peak is observed during this time. Remaining liquid means that the viscosity does not exceed 20 Pa*s at 23 °C.

[0186] Reactivity is measured using the following method. A 20 x 180 mm test tube is filled to a height of 7.5 cm with liquid syrup to which an initiator and an accelerator are added. A thermocouple is placed in the syrup. The tube is immersed to a depth of at least 140 mm in a water bath at 25 °C. The temperature is measured continuously, and the time to the temperature peak is recorded. Examples

[0187] The compounds used for the preparation of the various (meth)acrylic compositions are as follows:

[0188] - as a (meth)acrylic PI polymer: a PMMA formed by a copolymer of methyl methacrylate and ethyl acrylate, from the company Altuglas under the name Altuglas® BS 520B, abbreviated Pl-F,

[0189] - as a recycled (meth)acrylic polymer PI, a PMMA is used production having the same molecular weight as BS 520B (used as measured by size exclusion chromatography (SEC), abbreviated PI-R,

[0190] - as (meth)acrylic monomer Ml: a stabilized methyl methacrylate with hydroquinone monomethyl ether, abbreviated Ml-F,

[0191] - as recycled (meth)acrylic monomer Ml: a methyl methacrylate of The company Monômeros del Vallès is used, abbreviated as Ml-R

[0192] - benzoyl peroxide (BPO) is used as an initiator,

[0193] - DMPT (N,N-dimethyl-p-toluidine) is used as an accelerator.

[0194] Four syrups are prepared by first dissolving 20 parts by weight of the respective (meth)acrylic polymer PI in 80 parts by weight of the respective (meth)acrylic monomer Ml, according to Table 1.

[0195] Table 1 - compositions of the respective liquid (meth)acrylic syrup samples [Tables 1] Sample 1 Sample 2 Sample 3 Sample 4 Pl-F 20% by weight 20% by weight Pl-R 20% by weight 20% by weight Ml-F 80% by weight 80% by weight Ml-R 80% by weight 80% by weight Recycled content 0% by weight 20% by weight 80% by weight 100% by weight KgCO2 / kg Syrup 3.60 2.97 1.20 0.57

[0196] The characteristics of the four syrup samples are shown in Table 2.

[0197] Table 2 - Properties of liquid (meth)acrylic syrup [Tables 2] Value or range Process Sample 1 Sample 2 Sample 3 Sample 4 Coloration < 15 Hazen ISO 6271 Yes Yes Yes Yes Stability >24 h Internal Yes Yes Yes Yes Viscosity 80-120 mPa*s ISO 2555 Yes Yes Yes Yes Reactivity 30-45 min Internal Yes Yes Yes Yes

[0198] As can be seen in Table 2, the three recycled content samples have the same characteristics as the comparator sample using the polymer (meth)acrylic PI and the fossil-derived (meth)acrylic monomer Ml.

[0199] The initiator and accelerator are added to the respective samples: 3 parts of BPO are added and 4,000 ppm of DMPT.

[0200] The four syrups of the sample are polymerized to prepare a (meth)acrylic polymeric composition. A sheet-casting process is used.

[0201] Table 3 - Properties of the polymerized (meth)acrylic composition obtained from the polymerized liquid (meth)acrylic syrup [Tables 3] Unit E Process Sample 1 Sample 2 Sample 3 Sample 4 Hot deformation temperature °C ISO 75 110 112 111 112 Shore D hardness - ISO 868 85 84 85 87 Water absorption 7 days at 23 °C % ISO 62 0.5 0.5 0.5 0.5 Tensile strength MPa ISO 527 66 67 67 65 Tensile modulus GPa ISO 527 3.2 3.2 3.2 3.1 Tensile elongation at break % ISO 527 2.8 2.8 2.9 2.8 Flexural strength MPa ISO 178 111 112 110 113 Flexural modulus GPa ISO 178 2.9 2.8 2.9 3.0 Compressive strength MPa ISO 604 116 114.8 116.0 113.7 Compressive modulus GPa ISO 604 3.8 3.7 3.8 3.8

[0202] The four samples are used to infuse a fibrous substrate and polymerize after infusion. The fibrous substrate represents 50% by volume of the resulting (meth)acrylic polymeric composite material. A non-crimp glass fabric (NCF = "non-crimp fabrics" in English and non-corrugated multiaxial reinforcements in French) with a density of 600 g / m² is used as the fibrous substrate.

[0203] The mechanical properties of the obtained polymeric (meth)acrylic composite were analyzed.

[0204] A first series of measurements was carried out at an angle of + / - 45° to the direction of the fibers. The results obtained are summarized in Table 4.

[0205] A second series of measurements was carried out at an angle of 0790° towards the direction of the fibers. The results obtained are summarized in Table 5.

[0206] Table 4 - Properties of the (meth)acrylic polymeric composite obtained from a liquid (meth)acrylic syrup polymerized after infusion at an angle of + / - 45°. [Tables4] Unit Process Sample 1 Sample 2 Sample 3 Sample 4 Tensile Strength MPa ISO 14129 206 200 208 204 Tensile Modulus GPa ISO 14129 11 11 11 11 Tensile Elongation at Break % ISO 14129 No break No break No break No break

[0207] Table 5 - Properties of the (meth)acrylic polymeric composite obtained from the liquid (meth)acrylic syrup polymerized after infusion at an angle of 0° / 90°. [Tables 5] Unit Process Sample 1 Sample 2 Sample 3 Sample 4 Tensile strength MPa ISO 527 695 653 688 709 Tensile modulus GPa ISO 527 20 18 20 20 Elongation at break in tension % ISO 527 4.5 4.5 4 4.6 Flexural strength MPa ISO 14125 732 725 747 717 Flexural modulus GPa ISO 14125 19 19 19 19

[0208] Tables 4 and 5 show no significant change in the mechanical properties of the composite material.

Claims

Demands

1. A process for preparing a (meth)acrylic polymeric composite material MCPM1 comprising the following steps: (i) supplying an (meth)acrylic composition MCI comprising: (a) 100 parts by weight of a liquid (meth)acrylic syrup having a recycled content of at least 1% by weight comprising: (a) from 1% by weight to 50% by weight of one or more (meth)acrylic polymers PI, said, and (a2) from 50% by weight to 99% by weight of one or more (meth)acrylic monomers Ml, each monomer Ml comprising only one (meth)acrylic function per monomer, (b) optionally from 0.01 parts by weight to 5 parts by weight of a polymerization initiator, (c) optionally from 100 ppm to 10,000 ppm of an accelerator, (ii) contacting the (meth)acrylic composition MCI with the reinforcing material which is a fibrous substrate, (iii) polymerization of the (meth)acrylic MCI composition.

2. A process according to claim 1, characterized in that the (meth)acrylic MCI composition according to claim 1, characterized in that it comprises (c) from 0.01 parts by weight to 5 parts by weight of a polymerization initiator (d) between 100 ppm and 10,000 ppm of an accelerator.

3. A process according to claim 1 or 2, characterized in that the recycled content is at least 10% by weight.

4. A process according to claim 1 or 2, characterized in that the recycled content is between 15% by weight and 100% by weight.

5. A process according to claim 1 or 2, characterized in that the recycled content is from 20% by weight to 100% by weight.

6. A process according to claim 1 or 2, characterized in that the recycled content is from 50% by weight to 100% by weight.

7. A process according to any one of claims 1 to 6, characterized in that the recycled content of at least 1% by weight is derived either from the (meth)acrylic polymer PI, or from the (meth)acrylic monomer Ml, or from both.

8. A process according to any one of claims 1 to 6, characterized in that the (meth)acrylic monomer Ml is a recycled component comes from the depolymerization of a (meth)acrylic polymer comprising the (meth)acrylic monomer Ml.

9. A process according to any one of claims 1 to 6, characterized in that the (meth)acrylic PI polymer as a recycled component is derived from waste, preferably post-industrial or post-consumer waste

10. A method according to any one of claims 1 to 3, characterized in that the (meth)acrylic PI polymer or each (meth)acrylic PI polymer is selected from a methyl methacrylate homopolymer and a methyl methacrylate copolymer and a mixture thereof, the methyl methacrylate advantageously representing at least 50% by weight of the (meth)acrylic PI polymer or each (meth)acrylic PI polymer.

11. A process according to any one of claims 1 to 4, characterized in that the liquid (meth)acrylic syrup has a viscosity between 10 mPas and 10,000 mPas at 25 °C.

12. A process according to any one of claims 1 to 11, characterized in that the (meth)acrylic composition MCI is prepared by a process comprising the following steps: (i) supplying a (meth)acrylic polymer PI and (meth)acrylic monomers M1, at least one of them having a 100% recycled content, (ii) preparing 100 parts by weight of (a) a liquid (meth)acrylic syrup having a recycled content of at least 1% by weight, comprising: (a1) from 1% by weight to 50% by weight of one or more (meth)acrylic polymers PI, and (a2) from 50% by weight to 99% by weight of one or more (meth)acrylic monomers M1, each monomer M1 comprising only one (meth)acrylic function per monomer, by mixing components (a1) and (a2), (iii) supplying optionally from 0.01 parts by weight to 5 parts by weight of a polymerization initiator (iv) the possible supply of between 100 ppm and 10,000 ppm of an accelerator,(v) the mixture of components,

13. A process according to any one of claims 1 to 11, characterized in that the (meth)acrylic MCI composition is prepared by a process including the following steps: (i) the supply of 100 parts by weight of (a) a liquid (meth)acrylic syrup having a recycled content of at least 1% by weight, comprising: (aO of 1% by weight to 50% by weight of one or more (meth)acrylic PI polymers, and (a2) from 50% by weight to 99% by weight of one or more (meth)acrylic monomers Ml, each monomer Ml comprising only one (meth)acrylic function per monomer, (ii) the supply of 0.01 parts by weight to 5 parts by weight of a polymerization initiator, (iii) the supply of between 100 ppm and 10,000 ppm of an accelerator, (iv) the mixing of the components.

14. A process according to any one of claims 13 or 14, characterized in that the process further comprises a step of filtering liquid (meth)acrylic syrup having a recycled content of at least 1% by weight.