Fiber-reinforced thermoplastic resin prepreg, molded body of same, and method for producing fiber-reinforced thermoplastic resin prepreg

Abstract

A fiber-reinforced thermoplastic resin prepreg containing (A) reinforcing fibers, (B) a sizing agent and (C) a polyamide resin is described, wherein the sizing agent (B) and the polyamide resin (C) satisfy the condition N.sub.m/N.sub.0<4.0, wherein N.sub.0 is the average of torques necessary for maintaining the number of revolutions of a roller type blade at 100 rpm/15 minutes.

Claims

1. A method for producing a fiber-reinforced thermoplastic resin prepreg, the method comprising adding (C) a polyamide resin in a melted state to a plurality of (A) reinforcing fibers adhering to (B) a sizing agent and pressurizing at a temperature that is higher than a melting point of (C) the polyamide resin by 10 to 60 C. and at a pressure of 0.1 to 5.0 MPa, wherein (A) the reinforcing fibers have a weight per unit area (g/m.sup.2) of 50 to 300, (C) the polyamide resin is at least one resin selected from the group consisting of Nylon 6, Nylon 12, Nylon 610, Nylon 612 and Nylon MXD6, where the polyamide resin has a melting point of 250 C. or lower, and in which (B) the sizing agent and (C) the polyamide resin satisfy the following conditions:
N.sub.m/N.sub.02 wherein N.sub.0 is an average of torques of a roller type blade required for maintaining number of revolutions of a roller type blade at 100 rpm for 15 minutes, an average representing the fluidity of (C) the polyamide resin in cases where a mixer having a volume of 60 cc and a roller type blade is used, only (C) the polyamide resin is filled into the mixer such that filling ratio is 60% relative to the volume of the mixer, and the resin is heated and melted at a temperature that is higher than the melting point of (C) the polyamide resin by 30 C.; and wherein N.sub.m, is an average of torques of a roller type blade required for maintaining a number of revolutions of a roller type blade at 100 rpm for 15 minutes, the average representing the fluidity of a mixture which is obtained by using a mixer having a volume of 60 cc and a roller type blade, filling the mixer with a mixture, in which (B) the sizing agent and (C) the polyamide resin are mixed at 3:100 (mass ratio), such that the filling ratio is 60% relative to the volume of the mixer, and heating and melting the mixture at a temperature that is higher than the melting point of (C) the polyamide resin by 30 C.

2. A method for producing a molded body comprising the following steps (1) to (4): step (1): at least two pieces of the fiber-reinforced thermoplastic resin prepreg prepared according to claim 1 are laminated to obtain a prepreg laminate; step (2): the prepreg laminate obtained from the step (1) is preheated at a temperature that is higher than the melting point of (C) the polyamide resin by 10 to 60 C.; step (3): the preheated prepreg laminate is heated and pressurized at a temperature that is higher than the melting point of (C) the polyamide resin by 10 to 60 C. and at a pressure of 0.1 to 5.0 MPa; and step (4): the heated and pressurized prepreg molded body is cooled and pressurized at 0.1 to 5.0 MPa to obtain a molded body.

3. A fiber-reinforced thermoplastic resin prepreg comprising (A) reinforcing fibers, (B) a sizing agent, and (C) polyamide resin, wherein (A) the reinforcing fibers have a weight per unit area (g/m.sup.2) of 50 to 300, (C) the polyamide resin is at least one resin selected from the group consisting of Nylon 6, Nylon 12, Nylon 610, Nylon 612 and Nylon MXD6, where the polyamide resin has a melting point of 250 C. or lower, and (B) the sizing agent and (C) the polyamide resin satisfy the following conditions:
N.sub.m/N.sub.02 wherein N.sub.0 is an average of torques of a roller type blade required for maintaining the number of revolutions of a roller type blade at 100 rpm for 15 minutes, the average representing the fluidity of (C) the polyamide resin in cases where a mixer having a volume of 60 cc and a roller type blade is used, only (C) the polyamide resin is filled into the mixer such that the filling ratio is 60% relative to the volume of the mixer, and the resin is heated and melted at a temperature that is higher than the melting point of (C) the polyamide resin by 30 C., wherein N.sub.m is an average of torques of a roller type blade required for maintaining the number of revolutions of a roller type blade at 100 rpm for 15 minutes, the average representing the fluidity of a mixture, which is obtained by using a mixer having a volume of 60 cc and a roller type blade, filling the mixer with a mixture in which (B) the sizing agent and (C) the polyamide resin are mixed at 3:100 (mass ratio), such that the filling ratio is 60% relative to the volume of the mixer, and heating and melting the mixture at a temperature that is higher than the melting point of (C) the polyamide resin by 30 C., and wherein a complex viscosity of (C) the polyamide resin is 30 to 250 Pa-s under the following measurement conditions: <Measurement conditions> The complex viscosity measured at a temperature that is higher than the melting point of (C) the polyamide resin by 30 C., an angular frequency of 0.1 rad/s, and a displacement of 20% by dynamic viscoelasticity measurement using a rotary viscometer, in which a parallel plate is used, is defined as melt viscosity.

4. A fiber-reinforced thermoplastic resin prepreg comprising (A) reinforcing fibers, (B) a sizing agent, and (C) polyamide resin, wherein (A) the reinforcing fibers have a weight per unit area (g/m.sup.2) of 50 to 300, (C) the polyamide resin is at least one resin selected from the group consisting of Nylon 6, Nylon 12, Nylon 610, Nylon 612 and Nylon MXD6, where the polyamide resin has a melting point of 250 C. or lower, and (B) the sizing agent and (C) the polyamide resin satisfy the following conditions:
N.sub.m/N.sub.02 wherein N.sub.0 is an average of torques of a roller type blade required for maintaining the number of revolutions of a roller type blade at 100 rpm for 15 minutes, the average representing the fluidity of (C) the polyamide resin in cases where a mixer having a volume of 60 cc and a roller type blade is used, only (C) the polyamide resin is filled into the mixer such that the filling ratio is 60% relative to the volume of the mixer, and the resin is heated and melted at a temperature that is higher than the melting point of (C) the polyamide resin by 30 C., wherein N.sub.m, is an average of torques of a roller type blade required for maintaining the number of revolutions of a roller type blade at 100 rpm for 15 minutes, the average representing the fluidity of a mixture, which is obtained by using a mixer having a volume of 60 cc and a roller type blade, filling the mixer with a mixture in which (B) the sizing agent and (C) the polyamide resin are mixed at 3:100 (mass ratio), such that the filling ratio is 60% relative to the volume of the mixer, and heating and melting the mixture at a temperature that is higher than the melting point of (C) the polyamide resin by 30 C., and wherein (B) the sizing agent contains at least one compound selected from the group consisting of a compound (A1) which is represented by the following formula (1) and a compound (B1) which is represented by the following formula (2) ##STR00005## where for Formula (1), R.sup.1 and R.sup.2 are each independently a hydrogen atom or an alkyl group, R.sup.1 and R.sup.2 being the same or different from each other; and j and k are each independently an integer of 1 or higher, provided that the sum of j and k is an integer of 14 to 40; ##STR00006## where for Formula (2), R.sup.3 and R.sup.4 are each independently a hydrogen atom or an alkyl group, R.sup.3 and R.sup.4 being the same or different from each other; and m and n are each independently an integer of 1 or higher, provided that the sum of m and n is an integer of 54 to 100, wherein (B) the sizing agent comprises a mixture of the compound (A1) and the compound (B1) and the mass ratio (A1)/(B1) is within a range of from 2/1 to 1/2.

5. A fiber-reinforced thermoplastic resin prepreg comprising (A) reinforcing fibers, (B) a sizing agent, and (C) polyamide resin, wherein (A) the reinforcing fibers have a weight per unit area (g/m.sup.2) of 50 to 300, (C) the polyamide resin is at least one resin selected from the group consisting of Nylon 6, Nylon 12, Nylon 610, Nylon 612 and Nylon MXD6, where the polyamide resin has a melting point of 250 C. or lower, and (B) the sizing agent and (C) the polyamide resin satisfy the following conditions:
N.sub.m/N.sub.02 wherein N.sub.0 is an average of torques of a roller type blade required for maintaining the number of revolutions of a roller type blade at 100 rpm for 15 minutes, the average representing the fluidity of (C) the polyamide resin in cases where a mixer having a volume of 60 cc and a roller type blade is used, only (C) the polyamide resin is filled into the mixer such that the filling ratio is 60% relative to the volume of the mixer, and the resin is heated and melted at a temperature that is higher than the melting point of (C) the polyamide resin by 30 C., wherein N.sub.m is an average of torques of a roller type blade required for maintaining the number of revolutions of a roller type blade at 100 rpm for 15 minutes, the average representing the fluidity of a mixture, which is obtained by using a mixer having a volume of 60 cc and a roller type blade, filling the mixer with a mixture in which (B) the sizing agent and (C) the polyamide resin are mixed at 3:100 (mass ratio), such that the filling ratio is 60% relative to the volume of the mixer, and heating and melting the mixture at a temperature that is higher than the melting point of (C) the polyamide resin by 30 C., and wherein (B) the sizing agent is a sizing agent containing: a compound (A) which is an ester formed by reaction between an epoxy compound having one or more and three or less epoxy groups in the molecule and an unsaturated monobasic acid and having at least one epoxy group in the molecule; a urethane acrylate oligomer (B) of a bifunctional type; and an ester compound (C) which is an ester formed by reaction between an alkylene oxide adduct of bisphenols and a dicarboxylic acid compound and having an acid number of 50 or higher, the mass ratio of the content of the urethane acrylate oligomer (B) to the compound (A) being within a range of 1/3 to 2/1, and the content of the ester compound (C) being not more than 2.0 fold by mass greater than the total amount of the compound (A) and the urethane acrylate oligomer (B).

6. A fiber-reinforced thermoplastic resin prepreg comprising (A) reinforcing fibers, (B) a sizing agent, and (C) polyamide resin, wherein (A) the reinforcing fibers have a weight per unit area (g/m.sup.2) of 50 to 300, (C) the polyamide resin is at least one resin selected from the group consisting of Nylon 6, Nylon 12, Nylon 610, Nylon 612 and Nylon MXD6, where the polyamide resin has a melting point of 250 C. or lower, and (B) the sizing agent and (C) the polyamide resin satisfy the following conditions:
N.sub.m/N.sub.02 wherein N.sub.0 is an average of torques of a roller type blade required for maintaining the number of revolutions of a roller type blade at 100 rpm for 15 minutes, the average representing the fluidity of (C) the polyamide resin in cases where a mixer having a volume of 60 cc and a roller type blade is used, only (C) the polyamide resin is filled into the mixer such that the filling ratio is 60% relative to the volume of the mixer, and the resin is heated and melted at a temperature that is higher than the melting point of (C) the polyamide resin by 30 C., wherein N.sub.m, is an average of torques of a roller type blade required for maintaining the number of revolutions of a roller type blade at 100 rpm for 15 minutes, the average representing the fluidity of a mixture, which is obtained by using a mixer having a volume of 60 cc and a roller type blade, filling the mixer with a mixture in which (B) the sizing agent and (C) the polyamide resin are mixed at 3:100 (mass ratio), such that the filling ratio is 60% relative to the volume of the mixer, and heating and melting the mixture at a temperature that is higher than the melting point of (C) the polyamide resin by 30 C., and wherein the N.sub.0 is 2.08 or lower.

Description

EXAMPLES

(1) Hereinbelow, the present invention is specifically described in view of Examples.

(2) Furthermore, the carbon fiber bundle of the present invention is described more specifically based on Examples, but the present invention is not limited to them.

Preparation Example 1

Sizing Solution A

(3) By using a mixer (manufactured by Tokushu Kika Kogyo Co., Ltd., trade name: HIVIS DISPER MIX, homo mixer mode: mode 3D-5 type), a sizing solution was prepared by reverse phase emulsion method in the following order.

(4) A mixture containing 40 parts by mass of epoxy resin jER (registered trade mark) 828 (trade name, manufactured by Japan Epoxy Resins Co., Ltd.), 40 parts by mass or epoxy resin jER (registered trade mark) 1001 (trade name, manufactured by Japan Epoxy Resins Co., Ltd.), and 20 parts by mass of non-ionic surfactant Pluronic F88 (trade name, manufactured by BASF) was kneaded and mixed at 90 C. by using a planetary mixer and a homo mixer to obtain the resin composition (II) (sizing agent). Next, de-ionized water was added dropwise by a small amount to the resin composition (II), and after passing the reverse phase point, the amount for dropwise addition was increased. Finally, the sizing solution A with resin composition concentration of 40% by mass was obtained.

Preparation Example 2

Sizing Solution B

(5) A mixture of 50 parts by mass of bisphenol A ethylene oxide 60 mole adduct (manufactured by Matsumoto Yushi-Seiyaku Co., Ltd.) and 50 parts by mass of bisphenol A ethylene oxide 30 mole adduct (manufactured by Matsumoto Yushi-Seiyaku Co., Ltd.) was added to de-ionized water and stirred therein. Finally, the sizing solution B with resin composition concentration of 70% by mass was obtained.

Preparation Example 3

Sizing Solution C

(6) The component (A2), the component (B2), the component (C2), and other components of the following type and amount were kneaded and mixed at 80 to 100 C. by using a planetary mixer and a homo mixer. After that, the temperature was lowered to 80 C. while maintaining the kneading and an aqueous solution of the component (D) was added by a small amount thereto. The viscosity of the content gradually increased during this step. After adding the entire amount of an aqueous solution of the component (D), the temperature was lowered for 10 minutes to 60 C. under sufficient kneading. Next, de-ionized water was added dropwise by a small amount thereto, and after passing the reverse phase point, the amount for dropwise addition was increased. Finally, an aqueous dispersion of the sizing solution C with effective component content of 40% by mass or so was obtained.

(7) (A2) Bisphenol A epoxy resin with one end modified by acryl (35 parts by mass) (EP828 base) manufactured by Mitsubishi Rayon Co., Ltd.

(8) (B2) Aliphatic urethane acrylate oligomer (30 parts by mass)CN-9788, manufactured by Sartomer Company, Inc.

(9) (C2) Anhydrous fumaric acid ester of bisphenol Aethylene oxide 2 mole adduct (20 parts by mass) (Oxide 55) Mitsubishi Rayon Co., Ltd.

(10) (D) Nippon Nyukazai Co., Ltd. Newcol 723SF (15 parts by mass).

(11) [Polyamide Resin]

(12) Nylon 6 (manufactured by Ube Industries, Ltd., 1013B)

(13) Nylon 6 (manufactured by Ube Industries, Ltd 1022B)

(14) MXD6 (manufactured by Mitsubishi Gas Chemical Company, Inc., 56001)

(15) (Measurement of Melt Viscosity)

(16) The polyamide resin was subjected to press molding to have the thickness of 1 mm, and by using a punching blade, a test specimen (diameter of 25 mm) for measuring viscoelasticity was prepared. The test specimen was loaded on a rotary type viscometer at 255 C. of Nylon 6 or at 270 C. for MXD6. Then, dynamic viscoelasticity was measured at the angular frequency of from =100 (rad/sec) to 0.1 (rad/sec) and the displacement of from 5 to 20%. As a measurement device, ARES100FRTN1 (manufactured by TA Instruments, Japan) was used. As a jig for measurement, a parallel plate with diameter of 25 mm was used. The melt viscosity at angular frequency=0.1 (rad/sec) in the obtained dynamic viscoelasticity data was used as complex viscosity. The displacement applied to the sample during the measurement was suitably adjusted such that the measured torques are within a dynamic range of a device transducer.

(17) (Measurement of Fluidity)

(18) The evaluation was made by using LABO PLASTOMILL (50C150) manufactured by TOYO SEIKI SEISAKU-SHO, LTD. with mixer volume of 60 cc, and a blade (R60).

(19) The polyamide resin was weighed so as to have filling ratio of about 60% (Nylon 6:41 g, MXD6:44 g). Next, it was added to the mixer which has been heated in advance to a temperature which is higher than the melting point by 30 C. (Nylon 6; 255 C. and MXD6; 270 C.) and kneaded for 15 minutes by rotating the screw at 100 rpm. N.sub.0 is obtained as the average of torques of a screw for 15 minutes required for maintaining the screw at 100 rpm during the kneading.

(20) Furthermore, the polyamide resin was heated until there is no change in mass at 80 C., and the de-moisturized sizing solution A to C was admixed therein in an amount for having resin composition of 3 wt %.

(21) Nylon 6: resin 40 g, and sizing composition 1.2 g

(22) MXD6: resin 42 g, and sizing composition 1.3 g

(23) The average of torques (N.sub.m) was measured for the obtained mixture in the same manner as above.

(24) The torque ratio (N) was obtained according to the following formula.
N=N.sub.m/N.sub.0

(25) N.sub.0: an average of torques of a roller type blade required for maintaining the number of revolutions of a roller type blade at 100 rpm for 15 minutes, the average representing the fluidity of [C] the polyamide resin in cases where a mixer having a volume of 60 cc and a roller type blade is used, only [C] the polyamide resin is filled into the mixer such that the filling ratio is 60% relative to the volume of the mixer, and the resin is heated and melted at a temperature that is higher than the melting point of [C] the polyamide resin by 30 C.

(26) N.sub.m: an average of torques of a roller type blade required for maintaining the number of revolutions of a roller type blade at 100 rpm for 15 minutes, the average representing the fluidity of a mixture which is obtained by using a mixer having a volume of 60 cc and a roller type blade, filling the mixer with a mixture, in which [B] the sizing agent and [C] the polyamide resin are mixed at 3:100 (mass ratio), such that the filling ratio is 60% relative to the volume of the mixer, and heating and melting the mixture at a temperature that is higher than the melting point of [C] the polyamide resin by 30 C.

(27) The results are given in Table 1.

Example 1

(28) Production of Reinforcing Fibers (Carbon Fibers))

(29) A bundle of carbon fibers which have not been adhered to a resin composition or the like (manufactured by Mitsubishi Rayon Co., Ltd., trade name: PYROFIL (registered trade mark) TR 50S15L) was immersed in an aqueous dispersion of the sizing solution B, which has been prepared to have solid concentration of 2.0% by mass. After passing through a nip roll, it was dried by contact for 10 seconds with a heating roll prepared to have surface temperature of 140 C. to obtain a bundle of carbon fibers that are adhered to a polyamide resin composition.

(30) (Production of Carbon Fiber Sheet and Prepreg)

(31) The produced carbon fiber bundle was wound using a drum winder and a sheet of unidirectional carbon fibers in which weight per unit area (FAW: mass of unit area) of carbon fiber is 145 g/m.sup.2 was produced. Meanwhile, the PAN-based carbon fiber 1 was handled in a fiber bundle (tow) state and the number of PAN-based carbon fibers 1 constituting each fiber bundle was 15000.

(32) (Production of Unidirectional Thermoplastic Resin Prepreg)

(33) On both surfaces of a sheet-like product of carbon fibers in which carbon fibers are oriented in one direction (weight per unit area; 145.0 g/m.sup.2), Nylon 6 resin film or MXD6 film was laminated to obtain a laminate. The laminate was heated at 255 C. for Nylon 6 or at 270 C. for MXD6. According to melt-impregnation of the thermoplastic resin film in the sheet-like product of carbon fibers, a thermoplastic UD prepreg was obtained. The obtained thermoplastic prepreg has the thickness of 159 m, the weight per unit area of 145.0 g/m.sup.2, and the fiber deposition content of 50.0%.

(34) (Molding of Molded Plate (12 Ply) of Unidirectional Carbon Fiber Composite Material)

(35) Twelve pieces of the UD prepreg were laminated such that the fiber axes are in the same direction and the resulting laminate was added to a molding frame. Furthermore, it was placed in a dual-performance press machine for heating and cooling (manufactured by SHINTO Metal Industries Corporation, product name: F-37) of which the heating plate has been heated in advance to 300 C., and it was preheated until the internal mold temperature was 240 C. for Nylon 6 or 260 C. for MXD6. Subsequently, the heating and pressurizing press was performed for 1 minute at pressure of 2 MPa, and then cooling press was performed at pressure of 2 MPa to obtain a molded plate.

(36) (Observation of Cross-section)

(37) The periphery of the obtained molded plate was embedded in polyester resin (manufactured by Kulzer, trade name: Techno bit 4000) and, by polishing any cross-section perpendicular to the fiber axis direction of carbon fibers, a measurement sample was prepared. The measurement sample was observed by using a digital microscope (manufactured by KEYENCE CORPORATION, trade name: VHX-100).

(38) (Void Area Ratio)

(39) The molded body was embedded in polyester resin (manufactured by Kulzer, trade name: Techno bit 4000) and, after polishing any cross-section perpendicular to the fiber axis direction of carbon fibers with a water-resistant paper in order of the number #200, 400, 600, 800, 1000, for 5 minutes for each number, the cross-sectional image was photographed at magnification of 150 times by using a digital microscope (manufactured by KEYENCE CORPORATION, trade name: VHX-100). The area of photographed cross-section and the area of void surface were measured and the ratio of the void area relative to the cross-sectional area was calculated to measure the void area ratio.

(40) (90 Bending Test)

(41) The molded plate of unidirectional carbon fiber composite material which has been obtained from above was cut to a size of length 60 mm (length in 90 direction)width 12.7 mm (length in 10 direction) by using a wet type diamond cutter to prepare a test specimen. By using a universal tester (manufactured by Instron, trade name: Instron5565) and analysis software (trade name: Bluehill), a three-point bending test was performed for the obtained test specimen according to ASTM D790 (press; R=5.0, L/D=16) and 90 bending strength was calculated.

(42) The results are given in Table 1.

(43) Regarding the overall evaluation, those showing positive results for all of 90 bending property, impregnation ratio, and N.sub.m/N.sub.0 evaluation were determined as A, those showing positive results for two of them were determined as B, those showing positive results for only one of them were determined as C, and those showing negative results for all of them were determined as D.

Example 2

(44) The evaluation was performed in the same manner as Example 1 except that the sizing solution C was used as a sizing agent. The results are given in Table 1.

Example 3

(45) The evaluation was performed in the same manner as Example 1 except that the sizing solution B was used as a sizing agent and MXD6 was used as a resin. The results are given in Table 1.

Example 4

(46) The evaluation was performed in the same manner as Example 1 except that the sizing solution C was used as a sizing agent and MXD6 was used as a resin. The results are given in Table 1.

Example 5

(47) A thermoplastic UD prepreg in which Nylon 6 (1013B) was used was obtained by the same production method as Example 1 above. The obtained thermoplastic prepreg has the thickness of 149 m, the weight per unit area of 125.0 g/m.sup.2, and the fiber deposition content of 42.0%. The obtained prepreg was cut to a size of 300 mm300 mm (widthlength) and cuts were created at constant interval by using a cutting floater (manufactured by LASERCK CORPORATION, product name: L-2500). At that time, the sheet portion up to 5 mm apart from the end of the sheet was removed and a cutting process was performed at an angle =45 between a cut for cutting the fiber and reinforcing fibers such that the reinforcing fibers can have length L of 25.0 mm and average cut depth I equals to 42.4 mm.

(48) (Molding of Laminate Plate)

(49) Sixteen layers of the thermoplastic UD prepreg which have been cut as described above were laminated quasi-isotropically ([0/45/901-45]s2), and the resulting laminate was added to a molding frame. Furthermore, it was placed in a dual-performance press machine for heating and cooling (manufactured by SHINTO Metal Industries Corporation, product name: SFA-50HH0) of which the heating plate has been heated in advance to 300 C., and preheated until the internal mold temperature is 250 C. Subsequently, the heating and pressurizing press was performed for 11 minutes at pressure of 0.3 MPa, and then cooling press was performed at pressure of 1.0 MPa to obtain a molded plate. The bending strength and void area ratio of the obtained molded plate are described in Table 1.

Example 6

(50) The laminated was prepared and the evaluation was performed in the same manner as Example 5 except that MXD6 was used as a resin. The results are given in Table 1.

Comparative Example 1

(51) The evaluation was performed in the same manner as Example 1 except that the sizing solution A was used as a sizing agent and Nylon 6 (1013B) was used as a polyamide resin. The results are given in Table 1.

Comparative Example 2

(52) The evaluation was performed in the same manner as Example 1 except that the sizing solution A was used as a sizing agent and MXD6 was used as a polyamide resin. The results are given in Table 1.

Comparative Example 3

(53) The evaluation was performed in the same manner as Example 1 except that the sizing solution A was used as a sizing agent and Nylon 6 (1022B) was used as a polyamide resin. The results are given in Table 1.

(54) TABLE-US-00001 TABLE 1 Comparative Comparative Comparative Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 1 Example 2 Example 3 Sizing agent Sizing B Sizing C Sizing B Sizing C Sizing B Sizing B Sizing A Sizing A Sizing A Polyimide Ny6(1013B) Ny6(1013B) MXD6 MXD6 Ny6(1013B) MXD6 Ny6(1013B) MXD6 Ny6(1022B) resin Prepreg Uni- Uni- Uni- Unidirectional Cut Cut Unidirectional Unidirectional Unidirectional directional directional directional N.sub.o 1.51 1.51 2.08 2.08 1.51 1.51 1.51 2.08 3.0 N.sub.m 1.89 2.65 2.74 3.28 1.89 1.89 12.03 13.66 12.50 N.sub.m/N.sub.o 1.25 1.75 1.32 1.58 1.25 1.25 7.97 6.57 4.17 Bending 110 105 80 77 450 620 60 60 40 strength (90) Void area ratio 5 7 7 8 5 7 17 17 20 Overall A A A A A A D D D evaluation

INDUSTRIAL APPLICABILITY

(55) According to the present invention, a fiber-reinforced thermoplastic resin prepreg which has light weight and excellent strength and rigidity, a molded body obtained by laminating the fiber-reinforced thermoplastic resin prepreg, and a method for producing the fiber-reinforced thermoplastic resin prepreg can be provided, and they are industrially very useful.