Resin film

A method for producing a resin film, comprising:

• polymerizing a monomer mixture comprising 80 to 99.99% by mass of methyl methacrylate, 0.01 to 2% by mass of a crosslinkable monomer and 0 to 19.99% by mass of an alkyl acrylate to form a layer (a), said methyl methacrylate, crosslinkable monomer and alkyl acrylate totaling 100% by mass of the monomer mixture,
• polymerizing a monomer mixture comprising 70 to 99.8% by mass of an alkyl acrylate, 0.2 to 10% by mass of a crosslinkable monomer and 0 to 29.8% by mass of additional copolymerizable monomers to form a layer (b), and
• polymerizing a monomer mixture comprising 80 to 100% by mass of methyl methacrylate and 0 to 20% by mass of additional copolymerizable monomers to form a layer (c), in this order, to produce a multi-layered particle (B) wherein an amount of the layer (a) is 5 to 15 parts by mass, an amount of the layer (b) is 40 to 60 parts by mass and an amount of the layer (c) is 35 to 50 parts by mass, based on 100 parts by mass of the total amount of the layer (a), the layer (b) and the layer (c), and a volume-based average particle diameter is 90 to 150 nm;
• kneading a mixture comprising at least the multi-layered particle (B) and a resin (A), wherein the resin (A) is a methacrylic resin (a1) comprising 80 to 100% by mass of a methyl methacrylate unit and 0 to 20% by mass of is an alkyl acrylate unit, said methyl methacrylate unit and alkyl acrylate unit totaling 100% by mass of the methacrylic resin (a1);
• and
• forming the kneaded mixture into a film.

A method for producing a resin film, which comprises kneading a mixture comprising at least a multi-layered particle (B) and a resin (A), wherein the resin (A) is a methacrylic resin (a1) comprising 80 to 100% by mass of a methyl methacrylate unit and 0 to 20% by mass of an alkyl acrylate unit, said methyl methacrylate unit and alkyl acrylate unit totaling 100% by mass of the methacrylic resin (a1);

• and
• forming the kneaded mixture into a film;
• wherein the multi-layered particle (B) is obtained by a process comprising:
• polymerizing a monomer mixture comprising 80 to 99.99% by mass of methyl methacrylate, 0.01 to 2% by mass of a crosslinkable monomer and 0 to 19.99% by mass of an alkyl acrylate to form a layer (a), said methyl methacrylate, crosslinkable monomer and alkyl acrylate totaling 100% by mass of the monomer mixture,
• polymerizing a monomer mixture comprising 70 to 99.8% by mass of an alkyl acrylate, 0.2 to 10% by mass of a crosslinkable monomer and 0 to 29.8% by mass of other copolymerizable monomers to form a layer (b), and
• polymerizing a monomer mixture comprising 80 to 100% by mass of methyl methacrylate and 0 to 20% by mass of other copolymerizable monomers to form a layer (c), in this order,
• wherein an amount of the layer (a) is 5 to 15 parts by mass, an amount of the layer (b) is 40 to 60 parts by mass and an amount of the layer (c) is 35 to 50 parts by mass, based on 100 parts by mass of the total amount of the layer (a), the layer (b) and the layer (c), and a volume-based average particle diameter of the multi-layered particle (B) is 90 to 150 nm.