Prepreg, method for producing same, and slit tape prepreg

A prepreg comprising the components [A] to [D] below and a preliminary reaction product of the component [B] and the component [C],

• wherein the component [B] comprises a m- or p-aminophenol epoxy resin [b1] and either a glycidyl ether epoxy resin or a glycidyl amine epoxy resin [b2] that has two or more glycidyl groups in a molecule, and the component [b1] in the prepreg including the preliminary reaction product accounts for 10 to 60 parts by mass, whereas the component [b2] in the prepreg including the preliminary reaction product accounts for 40 to 90 parts by mass relative to the total quantity, which accounts for 100 parts by mass, of the component [B] in the prepreg including the preliminary reaction product,
• wherein the epoxy resin composition is the remainder of the prepreg deprived of the component [A] and has a degree of conversion of 1% or more and 20% or less and a glass transition temperature in the range of −5° C. to 20° C. as measured by differential scanning calorimetry (DSC), and
• wherein at least one surface resin in the prepreg has a storage elastic modulus G′ in the range of 1.0×103 to 2.0×108 Pa as measured at a temperature of 40° C. and an angular frequency in the range of 0.06 to 314 rad/s:
• [A] carbon fiber,
• [B] an epoxy resin,
• [C] a curing agent, and
• [D] a thermoplastic resin.