JP2009249481A - Aromatic polycarbonate resin injection-molded product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molded product, which is formed of an aromatic polycarbonate resin and shows no rainbow-colored linear junction part under sunlight or light of an indoor fluorescent lamp. <P>SOLUTION: The injection-molded product is formed of an aromatic polycarbonate resin. When the molded product is put between two pieces of polarizing plates, a linear junction part can be observed by irradiating it with transmitted light. When main stress at respective measurement points obtained according to the law of Brewster based on the transmission directional birefringence measured over a range of 300 mm around the intersection between a liner junction part and a virtual reference line at measurement intervals 5 mm along the virtual reference line set to cross the linear junction part at right angles are represented by S(i) (i=1, 2, and 3 to 61), and absolute values [¾S(i)-S(i+1)¾/5] of an inclination of the main stress each obtained by dividing a difference with the adjacent main stress S(i+1) by the measurement interval (5 mm) are represented by G(i) (i=1, 2, and 3 to 59), the following expression (1) is satisfied: G(i)+G(i+1)+G(i+2)<0.40 (i=1, 2, and 3 to 59). <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an injection molded product formed from an aromatic polycarbonate resin. More specifically, the present invention relates to an injection-molded product in which no rainbow-colored line meeting part is observed on the surface of the molded product under sunlight or an indoor fluorescent lamp.

  In recent years, molded products made of polycarbonate resin have been used as front plate applications for glazing members such as automobile panoramic roofs and back door windows, liquid crystal televisions, and plasma televisions. However, in a large molded article having a resin association part, sunlight, light from an indoor fluorescent lamp, etc. cause interference as reflected light on the surface of the molded article, and is observed as a rainbow-colored linear association part. The iridescent linear association part is caused by the orientational distortion of the molecules of the aromatic polycarbonate resin in the surface of the molded product. Refraction occurs, and is observed as a rainbow-colored linear meeting part at the meeting part due to a continuous change in color. The observation of a rainbow-colored line-like association part on the surface of the molded product under sunlight or an indoor fluorescent lamp is a problem because the appearance of the product is impaired in actual use. In addition, since it is caused by a kind of weld in the surface of the molded product, there may be a problem in durability such as long-term physical properties of the product, and no rainbow-colored linear association portion is observed on the surface of the molded product. Molded articles are desired.

  Various knowledge is known about the molding method which eliminates the weld line on the surface of the molded product at the resin meeting part. For example, in a resin molded product injected from a plurality of hot runner valve gates, a weld line is generated at a resin meeting portion when molten resin joins in a mold cavity. In order to eliminate this weld line, a plurality of hot runner valve gates are filled with resin by opening the gates sequentially according to the timing at which the resin injected into the mold cavity reaches each gate by program control. A molding method for improving the occurrence of weld lines on the surface of a molded product by a so-called cascade molding method is known. (Non-Patent Document 1)

  In addition, when manufacturing a molded product that is injection-molded with a single point gate, when molding is performed using a mold having a standing wall shape, an opening shape, etc., molten resin is contained in a plurality of flow paths in the mold cavity. As a result of the separation, a weld line is generated at the meeting portion of the resin. In order to eliminate this weld line, a molding method improved by rapid heating / cooling die molding, local heating die molding, or the like is known. (Patent Documents 1 and 2) However, the molded product obtained by these injection molding methods is an effective molding method for eliminating the weld line on the surface of the molded product. It did not disclose technical knowledge about the department.

JP 2001-207062 A JP 2001-269978 A Plastics Technology. Dec. 2003 P38

  The present invention has been made in view of the above circumstances, and provides a molded article formed from an aromatic polycarbonate resin, in which no rainbow-colored linear association portion is observed under sunlight or an indoor fluorescent lamp. The purpose is to do.

  As a result of intensive studies to achieve this object, the present inventors have observed a linear association portion by sandwiching a molded product formed from an aromatic polycarbonate resin between two polarizing plates and irradiating transmitted light. In the molded product, the molded product in which the change rate of the main stress in the vicinity of the linear meeting part is in a specific range is formed such that no rainbow-colored linear meeting part is observed under sunlight or an indoor fluorescent lamp. As a result, the present invention was reached.

  According to the present invention, (1) an injection molded product that is formed from an aromatic polycarbonate resin, and in which the molded product is sandwiched between two polarizing plates and a linear meeting part can be observed by irradiating transmitted light. Then, along the virtual reference line set to be orthogonal to the linear meeting part, a 300 mm range centered on the intersection of the linear meeting part and the virtual reference line was measured at a measurement interval of 5 mm. The principal stress at each measurement point obtained according to Brewster's law based on birefringence is S (i) (i = 1, 2, 3,... 61), and the adjacent principal stress S (i + 1) When the absolute value [| S (i) −S (i + 1) | / 5] of the gradient of the main stress obtained by dividing the difference between the two by the measurement interval (5 mm) is G (i), An injection-molded article characterized by satisfying 1) is provided

  One of the preferred embodiments of the present invention is (2) the linear association portion formed when the molten resin flowing into the molding space from a plurality of gates provided in the mold meets. And / or the above-described configuration (1), which is a linear association portion formed when the molten resin separated into a plurality of flow paths and flowing into the molding space at the standing wall or opening provided in the mold meets It is an injection molded product.

  One of the preferred embodiments of the present invention is (3) the injection-molded product having the above-described configuration (1) or (2), wherein the injection-molded product is a transparent member.

  One of the preferred embodiments of the present invention is the injection molded product according to any one of the above configurations (1) to (3), wherein (4) the injection molded product is a vehicle glazing member.

  One of the preferred embodiments of the present invention is (5) injection molding according to any one of the above constitutions (1) to (4), wherein the total light transmittance measured in accordance with JIS K7361-1 is 25% or more. It is a product.

One of the preferred embodiments of the present invention is (6) the above-described configuration wherein the flow length from the gate to the flow end is 15 to 300 cm and the maximum projected area is 200 to 60,000 cm ² ( It is an injection-molded product according to any one of 1) to (5).

  One of the preferable aspects of the present invention is (7) an injection-molded product obtained by subjecting the injection-molded product of any one of the above configurations (1) to (6) to thermal bending or removal of the peripheral edge. .

  One of the preferred embodiments of the present invention is (8) an injection-molded product obtained by decorating the surface of any one of the above-described configurations (1) to (7).

Hereinafter, embodiments of the present invention will be described in detail.
The molded product of the present invention is a molded product in which a linear meeting portion can be observed by sandwiching the molded product between two polarizing plates and irradiating transmitted light, and orthogonal to the linear meeting portion. Obtained according to Brewster's law based on the birefringence in the transmission direction measured at a measurement interval of 5 mm over a 300 mm range around the intersection of the linear meeting part and the virtual reference line along the virtual reference line set to The main stress at each measurement point is S (i) (i = 1, 2, 3,... 61), and the difference from the adjacent main stress S (i + 1) is divided by the measurement interval (5 mm). When the absolute value [| S (i) −S (i + 1) | / 5] of the gradient of the main stress obtained by the above is G (i) (i = 1, 2, 3,..., 59), It is an injection-molded article characterized by the expression (1).
G (i) + G (i + 1) + G (i + 2) (i = 1, 2, 3,..., 59) <0.40 (1)

  In the injection molded product in which G (i) satisfies the above formula (1), a rainbow-colored linear meeting portion is not observed under sunlight or an indoor fluorescent lamp. Note that G (i) + G (i + 1) + G (i + 2) is preferably less than 0.35, and more preferably less than 0.30.

  In addition, when a linear meeting part is recognized in multiple places in this injection molded product, G (i) + G (i + 1) + G (i + 2) (i = 1, 2, 3,... ., 59) must satisfy the above formula (1).

In addition, the following method is illustrated as a shaping | molding method for satisfying the said Formula (1).
That is, in the molding of an injection-molded product made of aromatic polycarbonate, the molten resin merges at the resin meeting part, which is a place where a rainbow-colored linear meeting part may occur under sunlight or an indoor fluorescent lamp. The molding method which makes the resin temperature in that case 280 degreeC or more is mentioned. In order to satisfy this condition, the cylinder temperature during molding is preferably 285 ° C to 335 ° C, and more preferably 290 ° C to 330 ° C. The mold temperature is preferably 80 to 125 ° C, more preferably 85 to 120 ° C.

The principal stress S (i) is calculated by the following method.
(1) Identification of the linear meeting part The glass plate (11) placed above and below the polarization observation table (10) shown in FIG. paste. Place the molded product between the upper and lower glass plates to which the polarizing plate is attached, irradiate a fluorescent lamp from the lower part (13) of the polarization observation table, and create a rainbow pattern of the molded product caused by the light transmitted through the polarizing plate and the molded product. Visually observe and identify the linear meeting part.

(2) Setting of virtual reference line The virtual reference line has the highest birefringence value when birefringence is measured at intervals of 5 mm in the direction orthogonal to the specified linear meeting part. Set the intersection point at the indicated point. The virtual reference line is determined centering on the intersection part of the linear meeting part and has a length of 300 mm. When a plurality of linear meeting parts are confirmed in the injection molded product, virtual reference lines are set in the same manner in all the linear meeting parts. In addition, birefringence is measured using the birefringence measuring apparatus SCA-1500 made from Strain Optical Technologies.

(3) Calculation of principal stress Birefringence is measured at a measurement interval of 5 mm along a virtual reference line having a length of 300 mm. There are 61 measurement points per sample. In addition, birefringence is measured using the birefringence measuring apparatus SCA-1500 made from Strain Optical Technologies. Next, the principal stress S (i) is calculated according to Brewster's law expressed by the following equation (2).
S (i) = C × 1 / t × R (i) (2)
[Wherein, S (i) is the principal stress, R (i) is birefringence, t is the thickness of the measurement sample, and C is the intrinsic constant = 72. ]

The molded product of the present invention is an injection molded product formed from an aromatic polycarbonate resin. Injection molding methods used in the present invention include not only ordinary injection molding but also insert molding, in-mold coating molding, two-color molding, injection compression molding, injection press molding, heat insulation mold molding, rapid heating and cooling mold Examples include molding and ultra-high speed injection molding. Moreover, as a runner, a cold runner system or a hot runner system can be used, and the gate is not limited to a one-point gate or a plurality of gates. As for the size of the molded product, the flow length from the gate to the flow end is preferably 15 to 300 cm, and the maximum projected area is preferably ²⁰⁰ to 60,000 cm ² .

The shape of the molded product is a flat plate shape, an R shape, a standing wall shape, an opening shape, or the like, and is a molded product having a resin association part in the surface of the molded product.
The thickness of the molded product is not particularly limited as long as it is generally within the range of the molded product obtained by injection molding of the aromatic polycarbonate resin, but is preferably 1 to 20 mm, more preferably 2 to 18 mm.
The total light transmittance of the molded article is preferably light transmissive having 25% or more. Furthermore, 30% or more is preferable, and 35% or more is more preferable.

  The aromatic polycarbonate resin used in the present invention is obtained by reacting a dihydric phenol and a carbonate precursor. Examples of the reaction method include an interfacial polycondensation method, a melt transesterification method, a solid phase transesterification method of a carbonate prepolymer, and a ring-opening polymerization method of a cyclic carbonate compound.

  Representative examples of the dihydric phenol used here include hydroquinone, resorcinol, 4,4′-dihydroxydiphenyl, bis (4-hydroxyphenyl) methane, bis {(4-hydroxy-3,5-dimethyl). Phenyl} methane, 1,1-bis (4-hydroxyphenyl) ethane, 1,1-bis (4-hydroxyphenyl) -1-phenylethane, 2,2-bis (4-hydroxyphenyl) propane (commonly referred to as bisphenol A) ), 2,2-bis {(4-hydroxy-3-methyl) phenyl} propane, 2,2-bis {(4-hydroxy-3,5-dimethyl) phenyl} propane, 2,2-bis {(3 -Isopropyl-4-hydroxy) phenyl} propane, 2,2-bis {(4-hydroxy-3-phenyl) phenyl} propane, 2,2-bis (4 Hydroxyphenyl) butane, 2,2-bis (4-hydroxyphenyl) -3-methylbutane, 2,2-bis (4-hydroxyphenyl) -3,3-dimethylbutane, 2,4-bis (4-hydroxyphenyl) ) -2-methylbutane, 2,2-bis (4-hydroxyphenyl) pentane, 2,2-bis (4-hydroxyphenyl) -4-methylpentane, 1,1-bis (4-hydroxyphenyl) cyclohexane, , 1-bis (4-hydroxyphenyl) -4-isopropylcyclohexane, 1,1-bis (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane, 9,9-bis (4-hydroxyphenyl) fluorene, 9,9-bis {(4-hydroxy-3-methyl) phenyl} fluorene, α, α'-bis (4-hydroxyphenyl) -o-di Sopropylbenzene, α, α′-bis (4-hydroxyphenyl) -m-diisopropylbenzene, α, α′-bis (4-hydroxyphenyl) -p-diisopropylbenzene, 1,3-bis (4-hydroxyphenyl) ) -5,7-dimethyladamantane, 4,4′-dihydroxydiphenyl sulfone, 4,4′-dihydroxydiphenyl sulfoxide, 4,4′-dihydroxydiphenyl sulfide, 4,4′-dihydroxydiphenyl ketone, 4,4′- Examples thereof include dihydroxydiphenyl ether and 4,4′-dihydroxydiphenyl ester, and these can be used alone or in admixture of two or more.

  Among them, bisphenol A, 2,2-bis {(4-hydroxy-3-methyl) phenyl} propane, 2,2-bis (4-hydroxyphenyl) butane, 2,2-bis (4-hydroxyphenyl) -3- Methylbutane, 2,2-bis (4-hydroxyphenyl) -3,3-dimethylbutane, 2,2-bis (4-hydroxyphenyl) -4-methylpentane, 1,1-bis (4-hydroxyphenyl)- A homopolymer or copolymer obtained from at least one bisphenol selected from the group consisting of 3,3,5-trimethylcyclohexane and α, α′-bis (4-hydroxyphenyl) -m-diisopropylbenzene is preferred. In particular, a homopolymer of bisphenol A and 1,1-bis (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane Sphenol A, a copolymer with 2,2-bis {(4-hydroxy-3-methyl) phenyl} propane or α, α'-bis (4-hydroxyphenyl) -m-diisopropylbenzene is preferably used. . As the carbonate precursor, carbonyl halide, carbonate ester, haloformate or the like is used, and specific examples include phosgene, diphenyl carbonate, dihaloformate of dihydric phenol, and the like.

The molecular weight of the aromatic polycarbonate resin is preferably 1 × 10 ⁴ to 1 × 10 ^5, more preferably 1.5 × 10 ^{4 to} 3 × 10 ⁴ , and even more preferably 1.7 × 10 ^{4 to} 2.7 × 10 ^4. . When an aromatic polycarbonate resin having such a viscosity average molecular weight is used, the obtained molded product is a molded product suitable as a glazing member for vehicles because it has sufficient strength and good melt fluidity.

  Depending on the purpose of use of the molded product, conventional additives such as heat stabilizers, mold release agents, infrared absorbers, ultraviolet absorbers, antioxidants may be added to the aromatic polycarbonate resin as long as the light transmittance is not impaired. Agent, light stabilizer, foaming agent, reinforcing agent (talc, mica, clay, wollastonite, calcium carbonate, glass fiber, glass bead, glass balloon, milled fiber, glass flake, carbon fiber, carbon flake, carbon bead, carbon Milled fiber, metal flake, metal fiber, metal coated glass fiber, metal coated carbon fiber, metal coated glass flake, silica, ceramic particle, ceramic fiber, aramid particle, aramid fiber, polyarylate fiber, graphite, conductive carbon black, various Whisker, etc.), flame retardant (halogen, phosphate ester) Metal salts, red phosphorus, silicon, fluorine, metal hydrate, etc.), colorants (pigments and dyes such as carbon black and titanium oxide), light diffusing agents (acrylic crosslinked particles, silicon crosslinked particles, ultrathin) Glass flakes, calcium carbonate particles, etc.), fluorescent brighteners, phosphorescent pigments, fluorescent dyes, antistatic agents, flow modifiers, crystal nucleating agents, inorganic and organic antibacterial agents, photocatalytic antifouling agents (fine particle titanium oxide, Fine particle zinc oxide, etc.), impact modifiers typified by graft rubber, and photochromic agents can be blended.

  The molded product formed from the aromatic polycarbonate resin of the present invention is a transparent play board for a glazing member such as an automobile panoramic roof or a back door window, a front plate application such as a liquid crystal television or a plasma television, or a play equipment such as a pachinko machine. The industrial effect is extremely large.

  EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention further more concretely, this invention is not limited to these. In addition, the presence / absence of a rainbow-colored linear meeting part, the total light transmittance, the principal stress S (i), and the absolute value G (i) of the principal stress gradient were measured and calculated according to the following methods.

(1) Presence / absence of rainbow-colored linear meeting part: Light on the surface of the molded product was reflected by an indoor fluorescent lamp, and the presence / absence of rainbow-colored linear meeting part was visually observed.

(2) Total light transmittance: Measured with NDH-300A manufactured by Nippon Denshoku Co., Ltd. according to JIS K7361-1.

(3) Main stress S (i): The main stress S (i) was measured by the following method using a sample prepared by the following method.

(I) Identification of the linear meeting part The glass plate (11) placed above and below the polarization observation table (10) shown in FIG. Pasted. Place the molded product between the upper and lower glass plates to which the polarizing plate is attached, irradiate a fluorescent lamp from the lower part (13) of the polarization observation table, and form a linear association of the molded product caused by the light transmitted through the polarizing plate and the molded product. The part was identified by visual observation.

(Ii) Setting of virtual reference line The virtual reference line has the highest birefringence value when birefringence is measured at intervals of 5 mm in the direction orthogonal to the specified linear meeting part. The intersection point was set at the indicated point. In addition, the virtual reference line was determined centering on the intersection part of the linear meeting part, and was made into the range of length 300mm. In addition, birefringence was measured using the birefringence measuring apparatus SCA-1500 made from Strain optical Technologies. In all Examples and Comparative Examples, the linear meeting part was observed only at one place.

(Iii) Calculation of principal stress Birefringence was measured using a birefringence measuring apparatus SCA-1500 made by Strain Optical Technologies, Inc. at a measurement interval of 5 mm on a virtual reference line having a length of 300 mm. (A total of 61 measurement points per sample) Next, principal stress S (i) was calculated according to Brewster's law shown in the following formula (2).
S (i) = C × 1 / t × R (i) (2)
[Wherein, S (i) is the principal stress, R (i) is birefringence, t is the thickness of the measurement sample, and C is the intrinsic constant = 72. ]

(4) Absolute value G (i) of principal stress gradient: The principal stress S (i) obtained was calculated by inserting it into the following equation.
G (i) = [| S (i) -S (i + 1) | / 5]

[Example 1]
Polycarbonate resin pellets (manufactured by Teijin Chemicals Ltd .: Panlite L-1250Z (trade name)) as a resin material were dried at 110 ° C. for 5 hours. The resin material is injection press molded using a large molding machine (manufactured by Meiki Seisakusho: MDIP2100, maximum clamping force 33540 kN) equipped with a 4-axis parallel control mechanism and capable of injection press molding, and the thickness shown in FIG. A large molded product having a length of 4 mm, a length of 1,200 mm, and a width of 1,000 mm was produced. In such a molding machine, the dried pellets were supplied to the molding machine supply port by pneumatic transportation and used for molding. As a runner, a valve gate type hot runner (diameter: 8 mmφ) manufactured by HOTSYS was used.

Molding conditions are: cylinder temperature 310 ° C, hot runner set temperature 280 ° C, mold temperature 110 ° C movable side, 110 ° C fixed side, compression stroke 4.0mm, mold movement from intermediate mold clamping state to final mold clamping state The speed was 10 mm / second, and the pressure holding time was 150 seconds. Filling of the molten resin was performed by a cascade molding method in which injection was started from the gate of FIG. 2 (21), and after the molten resin reached the gate of (22), the valve gate of (22) was opened. Mold compression was started immediately before completion of filling, and the overlap was 0.5 seconds. Immediately after completion of filling, the valve gate was closed so that the molten resin did not flow backward from the gate to the cylinder. The pressure during the compression step was 17.2 MPa, and the pressure during the pressure holding step was maintained at half the pressure. The movable mold parting surface was not in contact with the fixed mold parting surface in the final advanced position. In such molding, tanθ representing the amount of tilt and the amount of twist was maintained at about 0.000025 or less by the 4-axis parallel control mechanism.
The obtained molded product was taken out, allowed to stand for 24 hours under conditions of a temperature of 23 ° C. and a relative humidity of 50%, and sufficiently cooled. The results of evaluation according to the evaluation items are shown in Table 1.

[Example 2]
Molding was performed in the same manner as in Example 1 except that the molding conditions were a cylinder temperature of 310 ° C, a hot runner set temperature of 280 ° C, a mold temperature of 90 ° C on the movable side, 90 ° C on the fixed side, and a compression stroke of 2.0 mm. . Table 1 shows the results of evaluating the obtained molded product.

[Example 3]
Molding was performed in the same manner as in Example 1 except that the molten resin was filled by simultaneous injection. Table 1 shows the results of evaluating the obtained molded product.

[Example 4]
Other than using polycarbonate resin pellets (manufactured by Teijin Chemicals Ltd .: Panlite L-1250Z (trade name) colored in gray with a colorant so that the total light transmittance is 35% at 4 mm thickness) as the resin material, All were molded in the same manner as in Example 1. Table 1 shows the results of evaluating the obtained molded product.

[Example 5]
The obtained molded product is a large molded product having a thickness of 10 mm, a length of 1,000 mm, a width of 900 mm and an opening shape shown in FIG. 3, and a molten resin is injected at a single point gate, and the pressure holding time is 540 seconds. Except that, all were molded in the same manner as in Example 1. Table 1 shows the results of evaluating the obtained molded product.

[Comparative Example 1]
The molding was performed in the same manner as in Example 1 except that the molding temperature was 270 ° C., the hot runner set temperature was 280 ° C., the mold temperature was 75 ° C. on the movable side, 75 ° C. on the fixed side, and 2.0 mm compression stroke. . Table 1 shows the results of evaluating the obtained molded product. Under these molding conditions, the temperature at which the molten resin merges at the linear meeting portion is low and the rate of change of the main stress is large. Was observed.

  As apparent from Table 1, along the virtual reference line, the principal stress at each measurement point obtained in accordance with Brewster's law based on the birefringence in the transmission direction measured in the 300 mm range with the measurement interval of 5 mm is S ( i) (i = 1, 2, 3,..., 61) and the absolute value of the gradient of the main stress obtained by dividing the difference from the adjacent main stress S (i + 1) by the measurement interval (5 mm). [| S (i) −S (i + 1) | / 5] is G (i), G (i) + G (i + 1) + G (i + 2) (i = 1, 2, 3,... 59) It can be seen that in the molded product satisfying <0.40, a rainbow-colored line-like association portion is not observed under sunlight or a fluorescent lamp.

Polarization observation table Front schematic diagram of the molded product created in the example Front schematic diagram of the molded product created in the example Measurement distribution of principal stress S (i) of molded article measured in Example Measurement distribution of principal stress S (i) of molded product measured in comparative example

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Polarization observation stand 11 Glass plate 12 Polarizing plate 13 Fluorescent lamp 21 Gate part (1st filling gate)
22 Gate part (second filling gate)
23 linear meeting part observed through polarizing plate 24 virtual reference line 25 gate part 26 opening part

Claims (8)

An injection-molded product formed from an aromatic polycarbonate resin, in which the molded product is sandwiched between two polarizing plates, and a linear association part can be observed by irradiating transmitted light. Brewster's law based on birefringence in the transmission direction measured at a measurement interval of 5 mm over a 300 mm range centering on the intersection of the linear meeting part and the virtual reference line along a virtual reference line set to be orthogonal to S (i) (i = 1, 2, 3,..., 61) is the principal stress at each measurement point obtained according to, and the difference from the adjacent principal stress S (i + 1) is the measurement interval (5 mm). When the absolute value [| S (i) −S (i + 1) | / 5] of the gradient of the main stress obtained by dividing is G (i) (i = 1, 2, 3,..., 59) An injection molded product characterized by satisfying the following formula (1):
G (i) + G (i + 1) + G (i + 2) (i = 1, 2, 3,..., 59) <0.40 (1)   The linear meeting part is formed when the molten resin flowing into the molding space from a plurality of gates provided in the mold meets, and / or a standing wall or opening provided in the mold. The injection molded product according to claim 1, which is a linear meeting part formed when the molten resin separated into a plurality of flow paths and flowing into the molding space meets.   The injection-molded product according to claim 1 or 2, wherein the injection-molded product is a transparent member.   The injection molded product according to any one of claims 1 to 3, wherein the injection molded product is a vehicle glazing member.   The injection molded product according to any one of claims 1 to 4, wherein the total light transmittance measured in accordance with JIS K7361-1 is 25% or more. The injection molded product according to any one of claims 1 to 5, wherein the flow length from the gate to the flow end is 15 to 300 cm, and the maximum projected area is 200 to 60,000 cm ² .   An injection-molded product obtained by subjecting the injection-molded product according to any one of claims 1 to 6 to thermal bending or peripheral edge removal.   An injection-molded product obtained by decorating the surface of the injection-molded product according to any one of claims 1 to 7.

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