JP2715455B2 - Sheet-like molded article made of organic fiber and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[Industrial applications]

The present invention relates to a sheet-like molded product made of organic fibers having high strength, high elastic modulus, heat resistance, and chemical resistance and having excellent electric properties.

[Prior art]

In recent years, the use of perforated sheet-like molded articles has increased. For example, electrical insulating paper, filters, speaker cones, building materials and the like can be mentioned. As the fiber constituting the perforated sheet-like molded product, a fiber having light weight, heat resistance, chemical resistance, and electrical insulation, high strength and high elastic modulus is desirable. As such fibers, aromatic polyamide fibers (aramid fibers) represented by poly-p-phenylene terephthalamide and poly-m-phenylene isophthalamide have been used.

[Problems to be solved by the invention]

In the case of a p-type aromatic polyamide fiber, the melting point is, for example, 50.
Since the temperature is 0 ° C. or higher, a sheet-like molded article cannot be obtained by itself, and a large amount of a binder is usually used to produce a molded article. As a matter of course, the binder did not satisfy the above-mentioned required performance, and thus the performance as a molded product was inferior to the physical properties expected from the p-type aromatic polyamide fiber alone. Moreover, in the case of m-type aromatic polyamide fiber, chemical resistance,
It was not sufficient in terms of mechanical properties and the like. These combinations, i.e., a combination of a p-aromatic polyamide fiber and an m-aromatic polyamide fiber can be used, but there is a problem that the hygroscopicity and chemical resistance are not sufficient. An object of the present invention is to provide a sheet-shaped molded article made of organic fibers, which has high strength, high elastic modulus, heat resistance, chemical resistance, and has characteristics such as excellent electric properties and low moisture absorption, and a method for producing the same. It is an object.

[Means for Solving the Problems]

The present invention provides a p-phenylene terephthalamide unit having 50 units.
Strength obtained from aromatic polyamide occupying more than mol%
20-g / d or more, elasticity 500-g / d or more fiber 30-70 wt%,
The present invention relates to a sheet-like molded product comprising a fiber and / or a film obtained from an aromatic polyester having a melting point or softening point of 250 to 380 ° C. and exhibiting anisotropy when melted, and 70 to 30% by weight, and a method for producing the same. is there. In the present invention, as a fiber having a strength of 20 g / d or more and an elastic modulus of 500 g / d or more obtained from an aromatic polyamide in which p-phenylene terephthalamide units account for 50 mol% or more, the main component is poly-p-phenylene terephthalamide. Fibers obtained by solution spinning a certain aromatic polyamide can be exemplified. Aromatic polyamides can be produced by various methods.For example, in a polar solvent such as N-methylpyrrolidone or N, N-dimethylacetamide, optionally, an inorganic salt such as calcium chloride or lithium chloride is added thereto. In the mixed solvent system added, aromatic diamine and aromatic dicarboxylic acid,
Alternatively, it can be synthesized by reacting these derivatives. Further, it can be synthesized by a melt polymerization method using an aromatic diamine and an ester compound such as aromatic dicarboxylic acid diphenyl. As the aromatic diamine, p-phenylenediamine,
m-phenylenediamine, methyl-p-phenylenediamine, 4,4'-dimethylbenzidine, 4,4'-diaminodiphenylether, 3,4'-diaminodiphenylether, 4,4'diaminodiphenylmethane, 2,6-diaminonaphthalene, 1,5-diaminonaphthalene and the like can be mentioned. Examples of the aromatic dicarboxylic acids include terephthalic acid, isophthalic acid, 4,4'-dicarboxydiphenyl, 2,6-dicarboxynaphthalene, and the like, and alkyl, aryl, alkoxy, and nuclear-substituted products of halogen groups. . What is important in the present invention is that the p-phenylene terephthalamide units in the aromatic polyamide account for 50 mol% or more of the whole. By doing so, the obtained aromatic polyamide has high crystallinity, excellent heat resistance and chemical resistance, and can be made into a fiber having high strength and high elastic modulus. Aromatic polyamide can be fiberized by a solution spinning method. The solution of the aromatic polyamide may be directly extruded into the coagulating liquid, or the spinning liquid may be once extruded into the air and then guided into the coagulating liquid to be coagulated to form a yarn. The obtained fiber may be used as it is, but is preferably subjected to drawing, heat treatment or a combination thereof. In the present invention, fibers having a strength of 20 g / d or more and an elastic modulus of 500 g / d or more are used. As the form of the aromatic polyamide fiber, short fiber or pulp is preferable. The short fibers have a length of 20 mm or less, preferably 10 mm or less, more preferably 5 mm or less, and more preferably fibrillated and pulped. The aromatic polyester having a melting point or softening point of 250 to 380 ° C is an aromatic dicarboxylic acid, an alicyclic dicarboxylic acid,
Among the diols formed from aromatic diols, alicyclic diols, aliphatic diols and / or aromatic hydroxycarboxylic acids, and derivatives thereof, polyesters that can be melt-molded at 250 to 350 ° C. are shown. Preferably, an aromatic polyester exhibiting anisotropy upon melting is desirable. The melting point indicates the temperature at which the crystal melts, and the softening point indicates the temperature at which the melt can be formed. Aromatic polyester that exhibits anisotropy when melted is defined as a polyester that is placed on a heated sample stage between two polarizing plates that are perpendicular to 90 °, and is heated in a flowable temperature range when heated. Which has the property of transmitting light. Such polyesters include, for example,
No.-20008, aromatic dicarboxylic acid aromatic diols and / or aromatic hydroxycarboxylic acids shown in JP-B-56-18016 and the like, and derivatives thereof,
In some cases, alicyclic dicarboxylic acids, alicyclic diols, copolymers of aliphatic diols and derivatives thereof are also included, but by introducing an alicyclic group or an aliphatic group, heat resistance and Care must be taken to ensure that the decrease in chemical resistance does not increase. Examples of the aromatic dicarboxylic acid include terephthalic acid, isophthalic acid, 4,4'-dicarboxydiphenyl, 2,6-dicarboxynaphthalene, 1,2-bis (4-carboxyphenoxy) ethane, and alkyl and aryl thereof. , Alkoxy and halogen substituents. Hydroquinone, resorcin, aromatic diols
4,4'-dihydroxydiphenyl, 4,4'-dihydroxybenzophenone, 4,4'-dihydroxydiphenylethane, 4,4'-dihydroxydiphenyl ether, 4,4'-
Dihydroxydiphenyl sulfide, 2,2'-bis (4
-Hydroxyphenyl) propane, 2,6-dihydroxynaphthalene, 1,5-dihydroxynaphthalene, 1,4-dihydroxynaphthalene and the like, and alkyl, aryl,
Examples include a nucleus-substituted alkoxy and halogen group. Examples of the aromatic hydroxycarboxylic acid include p-hydroxybenzoic acid, m-hydroxybenzoic acid, 2-hydroxynaphthalene-6-carboxylic acid, 1-hydroxynaphthalene-5-carboxylic acid, p-4-hydroxyphenylbenzoic acid, and the like. Alkyl, aryl, alkoxy and halogen-substituted halogen groups. Examples of the alicyclic dicarboxylic acid include trans-1,4-dicarboxycyclohexane, cis-1,4-dicarboxycyclohexane, and the like. Examples of the alicyclic and aliphatic diols include xylylene diol, ethylene glycol, trans-1,4-dihydroxycyclohexane, cis-1,4-dihydroxycyclohexane and the like. These aromatic polyesters can also be obtained in combination with carbonic acid derivatives such as diphenyl carbonate and phosgene. The aromatic polyester used in the present invention can be obtained by esterifying or polycondensing a combination of the above-mentioned raw materials or a derivative thereof by esterification or transesterification. 1) a copolyester consisting of 40 to 70 mol% of p-hydroxybenzoic acid residues, 15 to 30 mol% of the aromatic dicarboxylic acid residues and 15 to 30 mol% of aromatic diol residues, (2) terephthalic acid and And / or a copolyester comprising isophthalic acid and chlorohydroquinone, phenylhydroquinone and / or hydroquinone. (3) 20-80 mol% of p-hydroxybenzoic acid residues and 2
-Hydroxynaphthalene-6-carboxylic acid copolyester comprising 20 to 80 mol% These polyesters can be easily melt-molded to produce desired fibers and films. In particular, polyester that exhibits anisotropy when melted can be easily melt-spun, and the resulting fiber has high strength and a high modulus of elasticity, easily fibrillates by applying a shearing force, and its physical properties by heating. Can be fused without greatly changing the thickness. As the polycondensation reaction for obtaining the aromatic polyester, known bulk polymerization, solution polymerization, suspension polymerization, and the like can be employed, and at 150 to 360 ° C. under normal pressure or 10 to 0.1 torr under reduced pressure. Thus, polymerization catalysts such as Sb, Ti, and Ge compounds, and stabilizers such as phosphorus compounds and phenol compounds can be added. The obtained polymer may be used as it is, or may be used as a sample for melt molding by heat treatment in an inert gas or under reduced pressure in the form of a powder, or may be used by granulating once with an extruder. The apparatus used for melt molding can use a known one, and the processing temperature suitable for spinning and film formation is 280 to 420 ° C., preferably 300 to
~ 380 ° C. The obtained fiber or film can be used as it is, but may be subjected to stretching, heat treatment or an operation combining these. The form of the aromatic polyester fiber is preferably a short fiber or a pulp. The short fibers have a length of 20 mm or less, preferably 10 mm or less, more preferably 5 mm or less, and more preferably fibrillated and pulped. As a method for converting aromatic polyamide fibers and aromatic polyester fibers into short fibers or pulp, monofilaments, multifilament yarns, jet-spun products, etc. of the fibers are cut as they are or after being hardened with a resin or the like to shorten the fibers. Method. As the resin used for hardening, a resin that is soluble in a water-soluble or low-boiling organic solvent and can be eluted after cutting is preferable. Examples of such a resin include polyvinyl alcohol. The obtained short fibers can be pulped by beating in a dry or wet manner. It is desirable that short fibers and pulp be fibrillated when producing a sheet-like molded product. As a method of fibrillating, it is good to apply a shearing force to staple fibers and pulp, and to apply shearing force, dry or wet grinder, mill, crusher, mill, beater,
A refiner, a mixer, a beater or the like can be used. The fibrillated short fibers and pulp obtained by these treatments can be formed into a sheet-like molded article such as paper by the same method as ordinary pulp. The film made from the aromatic polyester by melt molding is 0.01 to 0.8 mm in view of the filling amount, preferably 0.05 to 0.8 mm.
A sheet having a thickness of 0.3 mm is good, and can be formed into a sheet-like molded article by sandwiching aromatic polyamide fibers, laminating in some cases, and heating and melting. Although the obtained sheet-like molded article can be used as it is, it is preferable to further perform a heat treatment. As a method of applying heat treatment, it is carried out by leaving it in an oven, passing it through an oven on a belt conveyor,
It is possible to select a method in which the heating roll is continuously interposed between the heating rolls and, optionally, while applying a compressive force. The heat treatment temperature can be selected from 150 to 380 ° C, preferably 220 to 350 ° C, more preferably 250 to 330 ° C, and the holding time is several seconds to 10 hours, preferably 1 minute to 3 hours.

【Example】

Examples are shown below to facilitate understanding of the present invention, but these are merely illustrative, and the gist of the present invention is not limited thereto. The physical property values in the examples were obtained as follows. (1) Fiber tension test A monofilament with a fiber length of 50 mm was used to maintain a distance between chucks of 20 m.
m, pulling speed at 2mm / min, chart speed 200mm
Recorded in / min. The number of samples was set to 15, and the average value was determined from those from which those exhibiting the maximum and minimum values of strength and elastic modulus were removed. (2) Composite paper strength 25 mm wide and 100 mm long in accordance with JISP8813 (1976)
The paper cut into pieces has a distance between the chucks of 80 mm and a pulling speed of 2 mm /
Pulled in minutes. A double-sided tape was stuck on both sides of the paper in a portion to be gripped by the chuck so as not to break at the chuck portion. The number of samples was 5, and the indication of strength was determined as "break length" as follows, and the average was shown. The longer the breaking length, the greater the strength of the paper. Break length (km) = (obtained strength kgf) / (width of test piece mm) / (basis weight of test piece g / m ² ) × 1000 (3) Water absorption of composite paper About 5 g of sample sheet at 150 ° C. After drying under reduced pressure for 15 hours, the weight was measured, and the sample was allowed to stand in a thermo-hygrostat kept at 23 ° C. and 65% RH for 40 hours, and the weight was measured. ). (4) Dielectric constant The composite paper was cut into a size of 10 cm × 10 cm, and a Sumitomo Chemical Industries, Ltd. epoxy resin Sumiepoxy ESA-011 and a methylcellosolve solution of an amine initiator (epoxy resin 100 g, amine initiator 4 g) , Methylcellosolve (40 g), taken out, air-dried, and semi-cured at 130 ° C. for 10 minutes. The semi-cured products are stacked and compression-molded at 160 ° C. for 30 minutes at a pressure of 50 kg / cm ² , and after molding, post-cured at 160 ° C. for 1 hour, so that the volume fraction of the organic fiber composite paper is about 40%. 2-3mm thick
Was obtained. Using this, the dielectric constant was determined by the mutual induction bridge method according to JISK6911-5-14. (Reference Example 1) p-acetoxybenzoic acid was added to a polymerization tank having a comb-shaped stirring blade.
Charge 7.2 kg (40 mol), 2.49 kg (15 mol) of terephthalic acid, 0.83 kg (5 mol) of isophthalic acid, and 4.93 kg (20.2 mol) of 2,6-diacetoxynaphthalene, and raise while stirring under a nitrogen gas atmosphere. The polymerization was carried out with vigorous stirring while heating at 330 ° C. for 1 hour while removing the acetic acid generated during this time. After cooling, the polymer was taken out and the yield was 10.23k
g, 96.5% of the theoretical yield, and optical anisotropy in a molten state was observed at 320 ° C. or higher. Polyester by 30mm diameter screw type extruder,
Melt spinning was performed. The base used has a hole diameter of 0.07 mm and a hole length of 0.14
mm, the number of holes is 308. Spinning at 340 ° C. yielded pale yellow transparent fibers. The fiber properties were as follows: Density 1.33 g / cc Fiber diameter 17.8 μm Strength 12.2 g / d Modulus 550 g / d (Reference Example 2) In the same polymerization tank as in Reference Example 1, p-acetoxybenzoic acid was added.
4 kg (30 mol) and 4.6 kg (20 mol) of 2-acetoxy-6-carboxynaphthalene were charged. Polymerization was carried out in the same manner as in Reference Example 1 to obtain an aromatic polyester with a yield of 8.26 kg (98.3% of the theoretical yield). At a temperature of 335 ° C. or higher, the polyester exhibited optical anisotropy in a molten state. This aromatic polyester was melt jet-spun at 350 ° C. In jet spinning, a suction port was provided below the spinneret, a high-speed air stream was caused to flow downward from the spinneret, and fibers coming out of the spinneret were blown downward, and collected on a wire mesh placed below. The obtained fiber was a transparent golden fiber having a length of 5 to 35 mm. The fiber properties were as follows: Density 1.33 g / cc Fiber diameter 17.6 μm Strength 11.8 g / d Elastic modulus 480 g / d (Reference Example 3) In the same polymerization tank as in Reference Example 1, p-acetoxybenzoic acid was added.
60 kg (20.0 mol), 2,4-bis (4-acetoxyphenyl) propane 4.74 kg (15.2 mol), terephthalic acid 2.49 kg
(15.0 mol). Polymerization was carried out in the same manner as in Reference Example 1 to obtain an aromatic polyester in a yield of 7.52 kg (96.8% of the theoretical yield). Although the melting point of this polyester was not clear, it was 310 ° C.
Thus, melt flow was possible. This polyester was melt-extruded at 340 ° C. using a single-screw extruder and a T-die to obtain a film.
T-die slit width 30cm, slit gap 0.2mm, 4
The film had an average thickness of 55 μm. (Example 1) Poly-p-phenylene terephthalamide fiber Density 1.44 g / cc Fiber diameter 12.8 μm Strength 21.2 g / d Modulus 568 g / d and aromatic polyester fiber obtained in Reference Example 1 Separately, they were cut to a length of 10 mm by the same rotary gear type cutting machine. Each of these fibers was mixed in an amount of 500 g and beaten in water of 8 for 30 minutes using a Niagara-fall wet beater. Each fiber after beating was a fibrillated pulp. These pulp mixtures were made in water to a size of 20 cm × 20 cm and a basis weight of about 60 g / m ² . The pulp paper is dried, compressed by a roll at room temperature, and
The composite pulp paper was subjected to compression heat processing using rolls at 350C and 350C. Microscopic observation of the composite pulp paper revealed that some of the aromatic polyester fibers obtained in Reference Example 1 were fused to each other. The water absorption was 1.3% and the breaking length was 2.90 km. The rupture lengths of the composite pulp paper treated in xylene for 8 hours under reflux at 140 ° C. and those placed in air at 250 ° C. for 6 hours are 2.82 and 3.05 km, respectively.
Excellent heat resistance was confirmed. Also, impregnating this composite pulp paper with epoxy resin,
The dielectric constant of FRP with 41% pulp was determined to be 3.5 at 1 MHz.
Met. (Comparative Example 1) A pulp paper was produced in the same manner as in Example 1, except that only the poly-p-phenylene terephthalamide fiber used in Example 1 was used. The obtained pulp paper was only a weak paper that did not reach the strength measurement. (Comparative Example 2) Poly-p-phenylene terephthalamide fiber used in Example 1 and poly-m-phenylene isophthalamide fiber Density 1.39 g / cc Fiber diameter 15.7 μm Strength 10.2 g / d Elastic modulus 180 g / Using d, a composite pulp paper was produced in the same manner as in Example 1. The water absorption was 3.8%, and the breaking length was 1 km or less. Also, impregnating this composite pulp paper with epoxy resin,
The dielectric constant of 39% pulp FRP was 4.2 MHz at 1 MHz.
And inferior to the present invention. (Example 2) The poly-p-phenylene terephthalamide fiber used in Example 1 and the aromatic polyester fiber obtained in Reference Example 1 were mixed at a mixing weight ratio of 35:65, and the same as in Example 1 was used. By the method, a composite pulp paper was prepared. The obtained composite pulp paper was placed in a nitrogen atmosphere furnace kept at 320 ° C., kept for 1 hour, and heat-treated. The water absorption of the obtained pulp paper is 1.0%,
It was 3.19km. Put this composite pulp paper in xylene, 140
8 hours treatment under reflux at 250 ℃, and 6 ℃ at 250 ℃ in air
The rupture lengths after a lapse of time were 3.15 and 3.12 km, respectively, and it was confirmed that they had excellent chemical resistance and heat resistance. Also, impregnating this composite pulp paper with epoxy resin,
The dielectric constant of the 38% pulp FRP was 3.4
Met. (Example 3) The poly-p-phenylene terephthalamide fiber used in Example 1 and the aromatic polyester fiber obtained in Reference Example 2 were used at a mixing weight ratio of 35:65. The aromatic polyester fiber obtained in Reference Example 2 was directly mixed with short fibers of poly-p-phenylene terephthalamide without being cut, and added to a wet beater to fibrillate in water. A composite pulp paper was produced in the same manner as in Example 1. The water absorption of the composite pulp paper is 1.4% and the breaking length is 3.24k
m. The rupture lengths of this composite pulp paper treated in xylene for 8 hours at 140 ° C reflux and those exposed to 250 ° C in air for 6 hours are 3.18 and 3.29km, respectively, and have excellent chemical and heat resistance. It was confirmed that. Also, impregnating this composite pulp paper with epoxy resin,
The dielectric constant of FRP with 37% pulp was measured at 1MHz.
3.3. (Comparative Example 3) Same as Example 1 except that only the aromatic polyester fiber obtained in Reference Example 2 was used, and the polyester fiber was added into a wet beater and fibrillated in water without cutting the polyester fiber. The composite pulp paper was produced by the method described above. The water absorption of the composite pulp paper is 0.2% and the breaking length is 2.87k
m. The breaking length after 6 hours at 250 ° C. in air was reduced to 2.01 km. Further, when the composite pulp paper was impregnated with an epoxy resin, a molded article having voids was obtained with poor wettability on the fiber surface. (Example 4) The poly-p-phenylene terephthalamide fiber used in Example 1 and the aromatic polyester fiber obtained in Reference Example 1 were mixed at a mixing weight ratio of 65:35, and the same as in Example 1 was used. By the method, a composite pulp paper was prepared. The water absorption of the composite pulp paper is 1.8% and the breaking length is 3.01k
m. The rupture lengths of this composite pulp paper treated in xylene at 140 ° C under reflux for 8 hours and those exposed to 250 ° C in air for 6 hours are 3.07 and 3.12km, respectively, and are excellent in chemical resistance and heat resistance. It was confirmed that. Also, impregnating this composite pulp paper with epoxy resin,
The dielectric constant of the 41% pulp FRP was 3.7 at 1MHz.
Met. (Example 5) Aromatic polyamide fiber composed of 25 mol% of p-phenylenediamine units, 25 mol% of 3,4'-diaminodiphenylether units and 50 mol% of terephthalic acid units and having 50 mol% of p-phenyleneterephthalamide units. Degree 1.39 g / cc Fiber diameter 13.4 μm Strength 23.2 g / d Elastic modulus 531 g / d and polyester fiber obtained in Reference Example 2 were used in the same manner as in Example 3 at a mixing weight ratio of 35:65. A composite pulp paper was produced. The water absorption of the composite pulp paper is 1.9% and the breaking length is 3.12k
m. The rupture lengths of this composite pulp paper treated in xylene at 140 ° C under reflux for 8 hours and those exposed to 250 ° C in air for 6 hours are 3.23 and 3.37km, respectively, and are excellent in chemical resistance and heat resistance. It was confirmed that. Also, impregnating this composite pulp paper with epoxy resin,
The dielectric constant of FRP with 41% pulp was measured at 1MHz.
3.6. (Example 6) The poly-p-phenylene terephthalamide fiber used in Example 1 and the polyarylate film of Reference Example 3 were used. Three layers of poly-p-phenylene terephthalamide fibers laid between two polyarylate films are stacked and pre-dried at 150 ° C for 2 hours, then at 360 ° C at 100 kg / cm ^2.
Compression molding. The mixing weight ratio was 38:62. The water absorption of the composite pulp mat is 1.9% and the breaking length is 3.88k
m. The rupture lengths of this composite pulp paper treated in xylene at 140 ° C under reflux for 8 hours and that exposed to 250 ° C in air for 6 hours are 3.77 and 3.72km, respectively, and have excellent chemical resistance and heat resistance. It was confirmed that. Also, when the dielectric constant of this composite pulp mat was measured,
It was 3.0 at 1 MHz.

【The invention's effect】

The sheet-shaped molded article of the present invention has features such as high strength, high elastic modulus, heat resistance, and chemical resistance, and excellent electrical properties and low moisture absorption. The sheet-shaped molded article of the present invention can be used as a material for electric edge green paper, various filters, materials for audio equipment, or a reinforcing material in FRP, FRTP, FRC, etc., which has heat resistance of Class F or higher.

──────────────────────────────────────────────────の Continuation of the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location H01B 3/52 H01B 3/52 D D01F 6/84 303B // D01F 6/84 303 311 311 D21H 5 / 20 E (72) Inventor Masayuki Yokokawa 156 Kawanoe-cho, Kawanoe-shi, Ehime Prefecture Miki Tokusatsu Paper Manufacturing Co., Ltd. (56) Reference JP-A-60-126400 (JP, A) JP-A-53-119305 (JP, A) JP-A-62-33820 (JP, A) JP-A-62-223398 (JP, A) JP-A-60-239600 (JP, A) JP-B-60-39025 (JP, B2)

Claims (4)

(57) [Claims] (1) a p-phenylene terephthalamide unit having 50 units
Strength obtained from aromatic polyamide occupying more than mol%
20-g / d or more, elasticity 500-g / d or more fiber 30-70 wt%,
70 to 30% by weight of a fiber obtained from an aromatic polyester having a melting point or softening point of 250 to 380 ° C and showing anisotropy when melted
And a sheet-like molded product comprising: 2. A p-phenylene terephthalamide unit having 50 units
Strength obtained from aromatic polyamide occupying more than mol%
20-g / d or more, elasticity 500-g / d or more fiber 30-70 wt%,
A sheet-shaped molded product comprising a film obtained from an aromatic polyester having a melting point or softening point of 250 to 380 ° C and exhibiting anisotropy when melted, in an amount of 70 to 30% by weight. (3) a p-phenylene terephthalamide unit having 50 units;
Strength obtained from aromatic polyamide occupying more than mol%
20-g / d or more, elasticity 500-g / d or more fiber 30-70 wt%,
70 to 30% by weight of a fiber obtained from an aromatic polyester having a melting point or softening point of 250 to 380 ° C and showing anisotropy when melted
After combining to form a sheet, the sheet is 250-3
A method for producing a sheet-shaped molded product, comprising heat-treating at 80 ° C. 4. A p-phenylene terephthalamide unit comprising 50
Strength obtained from aromatic polyamide occupying more than mol%
20-g / d or more, elasticity 500-g / d or more fiber 30-70 wt%,
A film having a melting point or softening point of 250 to 380 ° C. and obtained from an aromatic polyester exhibiting anisotropy when melted is combined with 70 to 30% by weight to form a sheet.
A method for producing a sheet-shaped molded product, comprising heat-treating at 0 to 380 ° C.