Abstract: The present invention relates to photobioreactors and more particularly to the use of a transparent composition based on at least one methacrylic polymer for constructing installations for the culture of photosensitive organisms. This composition can be in the form of films, plates, profiled elements or cylinders such as tubes. The invention also relates to a transparent multilayer structure comprising at least one layer of a methacrylic polymer and one layer comprising at least one antifouling additive, and to the use thereof for constructing installations for the culture of photosensitive organisms.

Abstract: The present invention relates to photobioreactors and more particularly to the use of a transparent composition based on at least one methacrylic polymer for constructing installations for the culture of photosensitive organisms. This composition can be in the form of films, plates, profiled elements or cylinders such as tubes. The invention also relates to a transparent multilayer structure comprising at least one layer of a methacrylic polymer and one layer comprising at least one antifouling additive, and to the use thereof for constructing installations for the culture of photosensitive organisms.

Abstract: The invention relates to a methacrylic composition comprising (100-x-y) parts of at least one methacrylic polymer comprising a MMA homo- or copolymer containing dispersed therein: x parts of particles of a thermoplastic polymer A containing MMA as a majority monomer which is crosslinked or has a weight-average mass Mw>300,000 g/mol, (in relation to a PMMA standard), with a weight-average diameter (ASTM D1921)>100 ?m, and <500 ?m; and y parts of particles of a crosslinked thermoplastic polymer comprising MMA as a majority monomer, with a weight-average diameter (ASTM D1921) ranging from 15 to 70 ?m; such that x varies between 2 to 20 and y varies between 10 to 25. Preferably, x+y<33. The invention also relates to a multilayer structure consisting of: a layer (I) comprising the inventive methacrylic composition; a layer (II) comprising at least one thermoplastic polymer, and an optional intermediate layer between layers (I) and (II).

Abstract: The invention relates to a methacrylic composition comprising (100-x-y) parts of at least one methacrylic polymer that is a homopolymer or copolymer of MMA, dispersed in which are: x parts of particles of a thermoplastic polymer A comprising MMA as the main monomer that is either crosslinked or that has a weight-average molecular weight Mw>300 000 g/mol, advantageously >400 000 g/mol (relative to a PMMA standard), with a weight-average diameter (ASTM D1921)>100 ?m, advantageously >250 ?m and <500 ?m, advantageously <400 ?m; y parts of particles of a crosslinked thermoplastic polymer B comprising MMA as the main monomer, with a weight-average diameter (ASTM D1921) ranging from 15 to 70 ?m; such that x varies from 2 to 20 and y varies from 10 to 25. Preferably, x+y<33.