Unidirectional prepreg, fiber-reinforced thermoplastic resin sheet, manufacturing methods of unidirectional prepreg and fiber-reinforced thermoplastic resin sheet, and molded body

A molded body comprising a fiber-reinforced thermoplastic resin sheet, the fiber-reinforced thermoplastic resin sheet containing spread reinforcement fibers and a thermoplastic resin and made up of a random laminated body of unidirectional prepregs, wherein an average content number of reinforcement fibers in a thickness direction of the unidirectional prepregs is ten or less, wherein the thermoplastic resin is a polymer of a bisphenol A epoxy compound represented by Formula (1):

• where n is an integer of 1 to 4
• and a bisphenol compound selected from the group consisting of bisphenol A, bisphenol F, bisphenol S, bisphenol B, bisphenol E, and bisphenol P, and wherein the polymer has a weight-average molecular weight of 40,000 to 60,000, and
• wherein the fiber-reinforced thermoplastic resin sheet has a void fraction of 1 vol % or less when measured according to JIS-7075,
• wherein the unidirectional prepregs are uniformly impregnated with the thermoplastic resin,
• wherein an average width of the unidirectional prepregs is 18 mm or less,
• wherein an average thickness of the unidirectional prepregs is 60 to 100 μm, and
• wherein a coefficient of variation of width of the unidirectional prepreg is 5% or less,
• wherein a coefficient of variation of the number of reinforcement fibers contained in the thickness direction in the unidirectional prepreg is 20% or less, and
• m, n, p, and q satisfy following Eq. (3):
• 0.7
• ≤
• {
• (
• m
• /
• n
• )
• /
• p
• }
• (
• 1
• /
• p
• )
• ≤
• 1.3
• (
• 3
• )
• wherein, the number of reinforcement fibers contained in the unidirectional prepreg is m (fibers), the average content number of reinforcement fibers in the thickness direction is n (fibers), the average width of the unidirectional prepreg is p (mm), and the single yarn diameter of reinforcement fibers is q (mm).