Fresnel lens base sheet

An extruded base sheet for a Fresnel lens suitable for the formation of a lens layer of an ultraviolet-cured resin, said base sheet being formed of a rubber-modified resin comprising an elastic material as dispersed particles and a resin as a continuous phase,

• (i) the resin constituting the continuous phase being a copolymer of a monomer (A) represented by formula (1)
• wherein R1 represents hydrogen or a methyl group;
• and R2 represents hydrogen or an alkyl group having 1 to 5 carbon atoms,
• with an acrylic (methacrylic) ester monomer (B) represented by formula (2)
• wherein R3 represents hydrogen or a methyl group;
• and R4 represents an alkyl group having 1 to 8 carbon atoms, the proportions of the monomer (A) and the monomer (B) being 75 to 25% by weight and 25 to 75% by weight, respectively, wherein the total amount of the monomers (A) and (B) is 100% by weight,
• (ii) the content of the elastic material in the dispersed phase being 3 to 20 parts by weight based on 100 parts by weight of the rubber modified resin,
• (iii) the diameter of dispersed particles of the elastic material constituting the dispersed phase being 0.3 to 1.0 μm, and
• (iv) the transmittance of light at 360 nm being not less than 50%, wherein the rubber-modified resin is a rubber-modified resin composition comprising:
• 100 parts by weight of the rubber-modified resin;
• and 0.1 to 5 parts by weight of transparent fine particles that are different in a refractive index difference by ± (0.005 to 0.040) from the rubber-modified resin and have an average particle diameter of 5 to 30 μm.