TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The composition further comprises: at least one coupling agent; a tackifying resin, plasticizer or another polymer, these are miscible or partially miscible with the acrylic block copolymer; and at least additional components comprising crosslinking agents, UV absorbers, inorganic fillers, plasticizers, dyestuffs, optical brighteners and flame retardant agents. The composition comprises at least 50 wt.% of the acrylic block copolymer. The block copolymer has a Young's modulus of less than 1000 MPa, preferably 10-500 MPa. The composition further comprises the block copolymer which is resistant to yellowing caused by UV. The flow temperature of the block copolymer is glass transition temperature of polymethylmethacrylate blocks and is 80-150 degrees C. In the photovoltaic module, a film of the composition has: a thickness of 400 mu m and an electromagnetic wave of a wavelength of 380-780 nm, transmission of the wave of greater than or equal to 90% and/or the level of disorder of less than or equal to 5%, where the transmission and the level of disorder of the film is measured according to standard ASTMD1003. The composition comprises a diblock copolymer (polymethylmethacrylate-b-poly(butyl acrylate)) of which the composition of monomers as determined by nuclear magnetic resonance is 52% of butyl acrylate and 48% of methyl methacrylate. The composition comprises a triblock copolymer (polymethylmethacrylate-b-poly(butyl acrylate)-b-polymethylmethacrylate (PMMA-b-PABU-b-PMMA)) of which the monomer composition as determined by nuclear magnetic resonance is 57% of butyl acrylate, 39% of methyl methacrylate and 4% of 2-(2-oxoimidazolidine)ethyl methacrylate. The composition is applied to a support, in the form of a layer of which the thickness is 5 mu m to 2 mm. Preferred Components: The block B1 contains butyl acrylate units and the block A1 contains methyl methacrylate units. The block copolymer comprises a methacrylate monomer containing acid, anhydride or imidazolidone groups. The support is made of glass, polymer, preferably polymethylmethacrylate, metal or all kinds of photovoltaic cells.