JP2003012745A - Molded article and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molded article in which the development of warpage and deformation are reduced. SOLUTION: The molded article is produced by the injection-molding of a specific block copolymer which does not have the maximum point of loss modulus in a range of 5 to 29 deg.C in a viscoelastic spectrum.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molded product having no warp or deformation and a method for manufacturing the molded product.

[0002]

2. Description of the Related Art A hydride of an aromatic vinyl polymer obtained by hydrogenating an aromatic ring of an aromatic vinyl polymer such as polystyrene, or an aromatic compound obtained by hydrogenating a copolymer of an aromatic vinyl compound and a vinyl compound. Group vinyl-based copolymer hydrides are
It is known that it is an optical material excellent in low birefringence and can be used as an optical lens or an optical disc.

However, the hydride of an aromatic vinyl polymer has a high elastic modulus but is fragile, so that it has a drawback that when a thin molded product is injection-molded, it is easily cracked at the time of mold release. On the other hand, if a hydrogenated block copolymer obtained by hydrogenating an unsaturated bond of an aromatic ring and an aliphatic chain of a block copolymer in which a polybutadiene block or a polyisoprene block is connected to a polystyrene block is used, It is known that even if a molded body is molded by injection molding, it is difficult to crack at the time of release (see, for example, JP-A 1-294721 and JP-A 1-318015).

[0004]

However, even with such a block copolymer hydride, a molded product which is thinner than the conventional one and which is used by laminating two or more sheets, or a wedge-shaped product. When a molded product having a non-uniform thickness such as a shape or an uneven thickness is injection-molded, warpage or deformation is likely to occur.

An object of the present invention is to provide a molded body which is free from warpage and deformation, and a method for manufacturing the molded body.

[0006]

Means for Solving the Problems The present inventor has obtained a molded product having no warp or deformation by molding using a polymer having a repeating unit of a specific structure and having a specific viscoelastic spectrum. I found that In particular, the thickness is not constant, warpage or deformation does not occur even when a thin-walled molded body is injection-molded as compared with a conventional one, and moreover, the thin-walled molded bodies are bonded together in a sheet form. They have found that they can be used and have completed the present invention.

That is, the molded article according to the present invention is represented by the polymer block [A] containing 90% by weight or more of the repeating unit [1] represented by the following formula (1) and the following formula (2). A repeating unit [2] and / or a repeating unit [3] represented by the following formula (3) in a total amount of 30% by weight or more, and a loss elasticity in a viscoelastic spectrum. It is characterized by being composed of a block copolymer whose maximum point of the ratio is not within the range of 5 to 29 ° C.

[0008]

[Chemical 7]

(In the formula, R ¹ is a hydrogen atom or 1 carbon atom.
Represents an 20 alkyl ^{group, R 2-1 2} is ^R 2, R
³ , R ⁴ , R ⁵ , R ⁶ , R ⁷ , R ⁸ , R ⁹ , R
^10, an ^{R 1 1} and ^{R 12,} each independently represent a hydrogen atom or an alkyl group, a hydroxyl group, an alkoxy group having 1 to 20 carbon atoms and a halogen group, having 1 to 20 carbon atoms. )

[0010]

[Chemical 8]

(In the formula, R ¹³ and R ¹⁴ each independently represent a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, a halogen group or an aryl group.)

[0012]

[Chemical 9]

(In the formula, R ¹⁵ and R ¹⁶ each independently represent a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, a halogen group or an aryl group.) The molded product of the present invention is preferably The plate shape is not constant and the ratio (a / b) of the maximum thickness (a) and the minimum thickness (b) is 1.2 or more.

Preferably, it is plate-shaped and has a maximum thickness of 0.7 mm or less.

Optical components are preferable, and more preferably any one of a light guide plate, an optical lens, and an optical disk.

The method for producing a molded article according to the present invention is
It is characterized in that the above block copolymer is melt-molded.

Preferably, the melt molding is injection molding.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION A molded article according to the present invention comprises a polymer block [A] containing 90% by weight or more of a repeating unit [1] represented by the following formula (1) and the following formula (2). A polymer block [B] containing a repeating unit [2] and / or a repeating unit [3] represented by the following formula (3) in a total amount of 30% by weight or more, and in a viscoelastic spectrum, It is characterized by being composed of a block copolymer whose maximum point of loss elastic modulus is not within the range of 5 to 29 ° C.

Specifically, the block copolymer used in the present invention has a loss elastic modulus (in a viscoelastic spectrum (change in dynamic mechanical properties with temperature) measured according to JIS-K7244-4 method). The maximum point of the unit: Pa) is
5 to 29 ° C., preferably 0 to 30 ° C., more preferably −
It has a characteristic that it is not within the range of 35 to 50 ° C, and more preferably -50 to 100 ° C. The maximum point of the loss elastic modulus is the maximum value given by the temperature-dependent curve of the loss elastic modulus (E ″) measured based on the JIS-K7244-4 method.

A block copolymer having a maximum loss elastic modulus within the above range tends to have a large warpage during melt molding and a large deformation over time after molding.
Especially when a block copolymer having no maximum point in the range of 5 to 29 ° C. is used, it is difficult to eliminate warpage and deformation of the molded product. Therefore, by using a block copolymer having a specific structure in which the maximum point of the loss elastic modulus is not within the above range, it is possible to eliminate warpage and deformation during and after molding.

The block copolymer used in the present invention has a polymer block [A] and a polymer block [B].

The polymer block [A] contains a repeating unit [1] represented by the following formula (1).

[0023]

[Chemical 10]

In the equation (1), R¹ Is a hydrogen atom
Alternatively, it represents an alkyl group having 1 to 20 carbon atoms. R
^2-12Is R^Two , R^Three , R^Four, R⁵ , R⁶ , R
⁷ , R⁸ , R ⁹ , R¹⁰, R¹¹And R¹²And
Each independently, a hydrogen atom and an alkyl group having 1 to 20 carbon atoms.
Group, hydroxyl group, alkoxy having 1 to 20 carbon atoms
Represents a group or a halogen group.

The preferred structure of repeating unit [1] is R
¹ is a hydrogen atom or a methyl group, and R ^{2 to} R
^This is the case where all ¹² are hydrogen atoms.

The repeating unit [1] is contained in the block [A] in an amount of 90% by weight or more, preferably 95% by weight or more. The repeating unit [1] in the block [A] is the amount (w _1A ) in the whole block copolymer.
The lower limit of 30% by weight, more preferably 40% by weight.
% By weight, particularly preferably 50% by weight and the upper limit is preferably 95% by weight. When the amount of the repeating unit [1] is in the above range, the heat resistance of the molded product is improved.

The balance other than the repeating unit [1] contained in the polymer block [A] is preferably a hydrogenated repeating unit derived from a chain conjugated diene, a chain vinyl compound or the like.

The polymer block [B] contains a repeating unit [2] represented by the following formula (2) and / or a repeating unit [3] represented by the following formula (3).

[0029]

[Chemical 11]

In the formula (2), R ¹³ and R ¹⁴ each independently represent a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, a halogen group or an aryl group.

[0031]

[Chemical 12]

Here, in the formula (3), R ¹⁵ and R ¹⁶ each independently represent a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, a halogen group or an aryl group.

The preferred structure of repeating unit [2] is R
^This is the case where ¹³ and R ¹⁴ are a hydrogen atom or a methyl group.

The preferred structure of repeating unit [3] is R
^This is the case where ¹⁵ is a hydrogen atom and R ¹⁶ is an ethyl group or an isopropyl group.

The total content of the repeating unit [2] and the repeating unit [3] in the block [B] is usually 30% by weight or more, preferably 50% by weight or more.

Further, the weight fraction w ₂ (% by weight) of the repeating unit [2] in the block copolymer and the weight fraction w _{3 of the} repeating unit [3] in the block copolymer.
The total amount (w ₂ + w ₃ ) with (wt%) is usually 5 wt% or more, preferably 10 to 60 wt%, more preferably 15 to 50 wt%. When the total amount of the repeating unit [2] and the repeating unit [3] is within the above range, warpage or deformation of the molded body is reduced.

The polymer block [B] may contain the above-mentioned repeating unit [1]. In this case, the content of the repeating unit [1] contained in the polymer block [B] is 70% by weight or less, preferably 50% by weight or less, based on the block [B]. The amount (w _1B ) in the whole block copolymer is preferably 50% by weight or less, more preferably 40% by weight or less, further preferably 30% by weight or less, and the lower limit is 0% by weight.
Is.

Further, in the present invention, the relationship between w _1B and the above w _1A is w _1B <w _1A .

As the content of the repeating unit [1] in the polymer block [B] increases, the transparency of the molded product improves. However, if too many,
The molded body becomes brittle and the mechanical strength is poor.

The polymer block [A] and the polymer block [B] may further contain a repeating unit [X] represented by the following formula (4).

[0041]

[Chemical 13]

Here, in the formula (4), R ¹⁷ represents a hydrogen atom or an alkyl group having 1 to 20 carbon atoms. R ¹⁸ represents a nitrile group, an alkoxycarbonyl group, a hydroxycarbonyl group, or a halogen group. R ¹⁹ is hydrogen,
R ¹⁸ and R ¹⁹ may form an acid anhydride group or an imide group.

When the repeating unit [X] is contained, the adhesive strength and the like when two or more molded articles are used in a laminated state are improved, but the hygroscopicity of the molded article is increased and the molded article is easily deformed. There is a tendency to Therefore, the weight fraction w _X (% by weight) of the repeating unit [X] in the block copolymer is increased in order to suppress the moisture absorption deformation while improving the adhesive strength and the like when the two or more sheets are laminated and used. , Preferably 20% by weight or less, more preferably 10% by weight or less.

The block copolymer used in the present invention has a weight fraction w _{A of} all repeating units constituting the polymer block [A], and a weight ratio of all repeating units constituting the polymer block [B]. When the ratio is w _B , the ratio (w _A : w _B ) is preferably 30:70 to 90:
10, more preferably 35:65 to 85:15, and further preferably 40:60 to 80:20. (W _A :
When w _B ) is in the above range, the mechanical strength and heat resistance are excellent.

In the present invention, the viscoelastic spectrum of the block copolymer shows the composition of repeating units of one polymer block [A] and the polymer block [B], the number of constituent blocks, the type of the terminal block, It varies depending on various factors such as the molecular weight of the 4-block copolymer and the block length of each of the 5 blocks. Therefore, in the present invention, in order to impart a specific viscoelastic spectrum to the block copolymer,
It is necessary to select these factors.

From the viewpoint of the number of constituent blocks and the type of terminal block, for example, ([A]-[B]) type diblock copolymer, ([A]-[B]-[A]) type, ([B]-
[A]-[B]) type triblock copolymers are preferable, and when the number of blocks is more than this, the polymer blocks [A] and the polymer blocks [B] are alternately added in a total of 4 or 5.
A block copolymer in which about a number of individual blocks are connected is preferable. Also,
The block [A] and the block [B] may be bonded in a radial form.

The molecular weight of the block copolymer used in the present invention is determined by gel permeation chromatography (GP) using tetrahydrofuran (THF) as a solvent.
The weight average molecular weight (Mw) in terms of polystyrene measured by C) is preferably 20,000 to 400,000.
0, more preferably 30,000 to 300,000, and further preferably 40,000 to 200,000. When the Mw of the block copolymer is within the above range, the mechanical strength, heat resistance, moldability, low birefringence and the like of the molded product are improved. Further, the molecular weight of each block portion in the block copolymer is Mw, the block [A] portion is preferably 2,000 to 380,000, and the block [B] is
The portion is preferably 1,000 to 280,000.

The molecular weight distribution of the block copolymer used in the present invention can be appropriately selected according to the purpose of use.
The ratio (Mw / Mn) of Mw and number average molecular weight (Mn) in terms of polystyrene measured by is preferably 4 or less, more preferably 3 or less, and particularly preferably 2 or less. When Mw / Mn is in this range, the mechanical strength and heat resistance are excellent.

The softening temperature (Ts) of the block copolymer used in the present invention can be appropriately selected according to the purpose of use.
The value measured by a thermo mechanical analyzer (TMA) is usually 0 ° C to 150 ° C, preferably 50 ° C to 14 ° C.
It is 5 degreeC, More preferably, it is 90 degreeC-140 degreeC.

The above block copolymer can be obtained, for example, by the following method.

(1) 1 aromatic vinyl compound, alicyclic vinyl compound having an unsaturated bond in the ring (hereinafter referred to as vinyl cycloalkene), and saturated alicyclic vinyl compound (hereinafter referred to as vinyl cycloalkane) Of a chain vinyl-based compound and a chain conjugated diene-based compound in a solution containing the above-mentioned polymer. A binary block copolymer is obtained by polymerizing a monomer mixture (b) containing at least 30% by weight of at least one species.

The monomer mixture (b) may contain at least one of an aromatic vinyl compound, a vinylcycloalkene and a vinylcycloalkane in a total amount of 70% by weight or less. Further, in the remaining 10% by weight of the monomer mixture (a), any one of the aromatic vinyl compound, vinylcycloalkene, and vinylcycloalkane can be used.
It may further contain one or more species.

Thereafter, if necessary, depending on the desired number of blocks, in a solution containing the binary block copolymer, the monomer mixture (a) and the monomer mixture (b) are added to the ends of the block copolymer. It is possible to polymerize alternately to produce a block copolymer having 3 or more blocks.

As the aromatic vinyl compound, for example,
Styrene, α-methylstyrene, 2-methylstyrene,
3-methylstyrene, 4-methylstyrene, 2,4-diisopropylstyrene, 2,4-dimethylstyrene, 4
-T-butylstyrene, 5-t-butyl-2-methylstyrene, 4-monochlorostyrene, dichlorostyrene,
4-monofluorostyrene, 4-phenylstyrene, etc. are mentioned.

Examples of the vinyl cycloalkene include 4-vinylcyclohexene, 4-isopropenylcyclohexene, 1-methyl-4-vinylcyclohexene, 2-methyl-4-vinylcyclohexene, 1-methyl-4-isopropenylcyclohexene, 2-methyl-
4-isopropenyl cyclohexene, 3-vinyl cyclopentene, 4-vinyl cyclopentene, 5-vinyl bicyclo [2.2.1] hept-2-ene etc. are mentioned.

Examples of vinylcycloalkanes include vinylcyclobutane, vinylcyclopentane, vinylcyclohexane and 2-vinylbicyclo [2.2.1].
Heptane, isopropenyl cyclohexane, 3-methyl vinyl cyclohexane, 4-methyl vinyl cyclohexane, 3-methyl isopropenyl cyclohexane, 4-methyl isopropenyl vinyl cyclohexane etc. are mentioned.

These compounds may have a substituent such as a halogen group, an alkoxy group and a hydroxyl group.
In addition, these compounds may be used alone or in combination of two or more kinds.

Among these, when an aromatic vinyl compound and / or vinyl cycloalkene is used, the polymerization yield is increased and the introduction rate of the monomer into the block [B] is also increased. Furthermore, among these, styrene, α-methylstyrene, 2-methylstyrene, 3-methylstyrene,
It is more preferable to use at least one aromatic vinyl compound of 4-methylstyrene.

Examples of chain vinyl compounds include:
Ethylene, propylene, 1-butene, 1-pentene, 1
-Hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-dodecene, 1-eicosene, 4-
Chain olefins such as methyl-1-pentene and 4,6-dimethyl-1-heptene may be mentioned. Of these, ethylene and propylene are preferable.

Examples of the chain conjugated diene compound include 1,3-butadiene, isoprene, 2,3-dimethyl-1,3-butadiene, 2-phenyl-1,3-butadiene, 1,3-pentadiene, And 1,3-hexadiene and the like. Of these, 1,3-butadiene and isoprene are preferable.

In the above method, the monomer mixture (a)
And the monomer mixture (b) may contain a vinyl compound other than the above.

Examples of such vinyl compounds include nitrile monomers such as acrylonitrile, methacrylonitrile and 1-cyano-1-chloroethylene; 2
-Methoxycarbonyl-propene, 2-ethoxycarbonyl-propene, 2-propoxycarbonyl-propene, 2-butoxycarbonyl-propene, 1-methoxycarbonylethylene, 1-ethoxycarbonylethylene, 1-propoxycarbonylethylene, 1-butoxycarbonylethylene (Meth) acrylic acid ester-based monomers such as 1-carboxyethylene, 1-carboxy-
Unsaturated fatty acid monomers such as 1-methylethylene and maleic anhydride; 1-hydrocarbonylethylene, 2-hydrocarbonyl-propene, 1-methylcarbonylethylene, 2-methylcarbonyl-propene, N-phenylmaleimide and the like. .

As a method for polymerizing each polymer block using the above-mentioned monomer mixture, radical polymerization,
Any of anionic polymerization, cationic polymerization, coordinated anionic polymerization, coordinated cationic polymerization and the like may be used. When radical polymerization, anionic polymerization, cationic polymerization, etc. are carried out by living polymerization, particularly by using living anion polymerization, the hydrogenation reaction in the polymerization operation and the subsequent steps is facilitated and the resulting block copolymerization is obtained. Transparency of coalescence is improved.

Polymerization is usually carried out in the presence of a polymerization initiator at 0 ° C to
It is carried out in a temperature range of 150 ° C, preferably 20 ° C to 100 ° C, particularly preferably 10 ° C to 80 ° C. In the case of living anionic polymerization, examples of the initiator include monoorganolithiums such as n-butyllithium, sec-butyllithium, t-butyllithium, hexyllithium, and phenyllithium; dilithiomethane, 1,4-diobtan,
A polyfunctional organolithium compound such as 1,4-dilithio-2-ethylcyclohexane can be used.

The polymerization reaction form may be either solution polymerization or slurry polymerization. When solution polymerization is used, the heat of reaction can be easily removed. In this case, an inert solvent that dissolves the polymer obtained in each step is used. Examples of the inert solvent used include aliphatic hydrocarbons such as n-butane, n-pentane, isopentane, n-hexane, n-heptane and isooctane; cyclopentane, cyclohexane, methylcyclopentane, methylcyclohexane,
Alicyclic hydrocarbons such as decalin, bicyclo [4.3.0] nonane and tricyclo [4.3.0.1 ^2,5 ] decane; aromatic hydrocarbons such as benzene and toluene. Among them, if alicyclic hydrocarbons are used, they can be used as they are as an inert solvent in the hydrogenation reaction described later,
The block copolymer is also preferable because it has good solubility.
These solvents may be used alone or in combination of two or more.
The amount of these solvents used is usually 200 to 2000 parts by weight with respect to 100 parts by weight of all used monomers.

When each monomer mixture is composed of two or more kinds of components, a randomizer or the like can be used to prevent the chain of a certain one component from being lengthened. Particularly when the polymerization reaction is carried out by anionic polymerization, it is preferable to use a Lewis base compound or the like as the randomizer. Examples of the Lewis base compound include ether compounds such as dimethyl ether, diethyl ether, diisopropyl ether, dibutyl ether, tetrahydrofuran, diphenyl ether, ethylene glycol diethyl ether, ethylene glycol methylphenyl ether; tetramethylethylenediamine,
Examples thereof include tertiary amine compounds such as trimethylamine, triethylamine and pyridine; alkali metal alkoxide compounds such as potassium-t-amyl oxide and potassium-t-butyl oxide; phosphine compounds such as triphenylphosphine. These Lewis base compounds are
Each may be used alone or in combination of two or more.

The molecular weight of the block copolymer obtained by the polymerization reaction by the above-mentioned method is Mw in terms of polystyrene measured by GPC using THF as a solvent, preferably 20,
000 to 400,000, more preferably 30,000
To 300,000, more preferably 40,000 to 2
Set to the range of 0,000. In addition, the molecular weight distribution (Mw /
Mn) is preferably 4 or less, more preferably 3 or less,
Particularly preferably, the range is 2 or less. When Mw and Mw / Mn are in the above ranges, the mechanical strength and heat resistance of the block copolymer (in the case of carrying out the hydrogenation reaction described below, the block copolymer after hydrogenation) is improved. Further, when the hydrogenation reaction is carried out, the hydrogenation rate becomes high, and the transparency and thermal stability of the resulting block copolymer are improved.

(2) The block copolymer obtained in (1) above has an unsaturated bond (including an aromatic ring part).
In the case where the above is present, the unsaturated bond can be hydrogenated to obtain a block copolymer having a polymer block [A] and a polymer block [B].

The hydrogenation method for unsaturated bonds and the like, the reaction form and the like are not particularly limited and may be carried out according to a known method, but a hydrogenation method which can increase the hydrogenation rate and causes less polymer chain breaking reaction is preferable. . Such preferred hydrogenation methods include nickel, cobalt, iron, titanium, rhodium,
Examples include a method of using a catalyst containing at least one metal selected from palladium, platinum, ruthenium, rhenium and the like. As the hydrogenation catalyst, either a heterogeneous catalyst or a homogeneous catalyst can be used, and the hydrogenation reaction is preferably carried out in an organic solvent.

The heterogeneous catalyst can be used as a metal or a metal compound as it is, or by supporting it on a suitable carrier.
Examples of the carrier include activated carbon, silica, alumina,
Calcium carbonate, titania, magnesia, zirconia,
Examples include diatomaceous earth, silicon carbide, calcium fluoride and the like. The supported amount of the catalyst is usually in the range of 0.1 to 60% by weight, preferably 1 to 50% by weight. The supported catalyst has, for example, a specific surface area of 100 to 500 m 2 / g and an average pore diameter of 100 to 1000 Å, preferably 200 to 50.
Those having 0Å are preferred. The value of the specific surface area is a value calculated by measuring the nitrogen adsorption amount and using the BET formula, and the value of the average pore diameter is a value measured by the mercury penetration method.

As the homogeneous catalyst, for example, a catalyst obtained by combining a nickel, cobalt, titanium or iron compound and an organometallic compound (eg, organoaluminum compound, organolithium compound); rhodium, palladium,
A transition metal complex catalyst such as platinum, ruthenium, or rhenium can be used. As the nickel, cobalt, titanium or iron compound, for example, acetylacetonato compounds of various metals, carboxylates, cyclopentadienyl compounds and the like are used. Examples of the organic aluminum compound include alkyl aluminum such as triethyl aluminum and triisobutyl aluminum; aluminum halide such as diethyl aluminum chloride and ethyl aluminum dichloride; alkyl aluminum hydride such as diisobutyl aluminum hydride.

Examples of the organometallic complex catalyst include dihydrido-tetrakis (triphenylphosphine) ruthenium, dihydrido-tetrakis (triphenylphosphine) iron, bis (cyclooctadiene) nickel and bis (cyclopentadienyl) nickel. Transition metal complexes may be mentioned.

These hydrogenation catalysts may be used alone or in combination of two or more. The amount of hydrogenation catalyst used is usually 0.01 to 100 parts by weight, preferably 0.05 to 100 parts by weight of the polymer.
-50 parts by weight, more preferably 0.1-30 parts by weight.

The hydrogenation reaction temperature is usually from 10 ° C to 250 ° C.
C, preferably 50 to 200 C, more preferably 80.
When the temperature is from 180 ° C to 180 ° C, the hydrogenation rate becomes high and the molecular cleavage also decreases. The hydrogen pressure is usually 0.1 MPa to 3
When the pressure is 0 MPa, preferably 1 MPa to 20 MPa, and more preferably 2 MPa to 10 MPa, the hydrogenation rate increases, molecular chain scission decreases, and operability is excellent.

The hydrogenation rate of the block copolymer is ¹ H-
In the measurement by NMR, the carbon-carbon unsaturated bond of the main chain and the side chain, and the carbon-carbon unsaturated bond of the aromatic ring and the cycloalkene ring are each preferably 90% or more, more preferably 97% or more, It is preferably 99% or more. When the hydrogenation rate is high, the block copolymer obtained has low birefringence, thermal stability, and the like.

The block copolymer obtained by the above method is
The hydrogenation catalyst and / or the polymerization catalyst is removed from the reaction solution containing the block copolymer by a method such as filtration or centrifugation, and then recovered from the reaction solution.

The method of recovering the block copolymer from the reaction solution is not particularly limited, but for example, a steam coagulation method of removing the solvent by steam stripping from the solution in which the block copolymer is dissolved, or heating under reduced pressure. It can be recovered by a known method such as a direct desolvation method of removing the solvent or a coagulation method of pouring the solution into a poor solvent for the block copolymer to cause precipitation and coagulation.

The form of the block copolymer to be recovered is not limited, but it is usually in the form of pellets so that it can be easily molded and processed thereafter. When the direct desolvation method is used, for example, the molten block copolymer can be extruded in a strand form from a die, cooled, and then cut with a pelletizer to be pelletized for various moldings. When the coagulation method is used, for example, after the obtained coagulated product is dried, it is melt-extruded by an extruder, pelletized in the same manner as above, and subjected to various molding.

The block copolymer used in the present invention can be used by molding it into various molded products after blending various compounding agents as necessary to prepare a resin composition. The compounding agent is not particularly limited, but it is a stabilizer such as an antioxidant, a heat stabilizer, a light stabilizer, a weather resistance stabilizer, an ultraviolet absorber or a near infrared absorber; a resin modifier such as a lubricant or a plasticizer. Colorants such as dyes and pigments; antistatic agents and the like. These compounding agents can be used alone or in combination of two or more kinds, and the compounding amount thereof is appropriately selected within a range not impairing the object of the present invention.

Examples of the antioxidants include phenol-based antioxidants, phosphorus-based antioxidants, sulfur-based antioxidants and the like. Among them, phenol-based antioxidants, especially alkyl-substituted phenol-based antioxidants preferable. By compounding these antioxidants, it is possible to prevent the coloring and strength of the molded product from being deteriorated due to oxidative deterioration during molding without deteriorating transparency, low water absorption and the like.

These antioxidants may be used alone or in combination of two or more. The blending amount of the antioxidant is appropriately selected within a range that does not impair the object of the present invention, but is usually 0.001 to 5 parts by weight, preferably 0.01 to 1 part by weight with respect to 100 parts by weight of the block copolymer. It is a department.

A method for uniformly dispersing the above compounding agent in the block copolymer is, for example, dissolving the compounding agent in a suitable solvent and adding it to the block copolymer solution, and then removing the solvent to remove the compounding agent. Examples thereof include a method of recovering the block copolymer containing the resin, a method of kneading the compounding agent with the resin in a molten state by a mixer, a twin-screw kneader, a roll, a Brabender, an extruder and the like.

The block copolymer obtained by the above method can be molded into various molded articles and used for various purposes. The molding method is not particularly limited, but it is preferable to use the melt molding method in order to obtain a molded product excellent in low birefringence and mechanical strength. Examples of the melt molding method include injection molding method, injection compression molding method, extrusion molding method, extrusion stretch molding method, multilayer extrusion molding method, press molding method, blow molding method, injection blow molding method, and inflation molding method. From the viewpoints of low birefringence, dimensional stability, and the like, the injection molding method and the extrusion molding method are preferable. For example, an injection molding method is preferable for molding a molded body having a non-uniform thickness, and an extrusion molding method or an injection molding method is preferable for a large and thin molded product.

The molding conditions are appropriately selected depending on the purpose of use and the molding method. For example, in the case of the injection molding method, the resin temperature is usually 150 to 350 ° C., preferably 200 to 350 ° C.
The temperature is appropriately selected in the range of 300 ° C, more preferably 230 to 280 ° C. If the resin temperature is too low, the fluidity will deteriorate, causing sink marks and distortion in the molded product, and if the resin temperature is too high, silver streak will occur due to thermal decomposition of the resin, or the molded product will turn yellow, etc. Defects may occur.

Molded articles are plate-shaped, sheet-shaped, spherical, rod-shaped,
Although it can be formed into various shapes such as a tubular shape, it is a plate shape,
It is preferable that the thickness is not constant or the maximum thickness is 0.7 mm or less. When the thickness is not constant, it is more preferable that the ratio (a / b) of the maximum thickness (a) and the minimum thickness (b) is 1.2 or more, and the wedge-shaped one is most preferable. Ratio of maximum thickness (a) and minimum thickness (b) (a
/ B) is 1.2 or more, the dimensional stability of the molded article is excellent, and the effect is more remarkable in the molded article having a / b of 1.5 or more, and further, a / b is 2 or more. The effect is more remarkable in the above-mentioned molded body. Alternatively, even if the maximum thickness is as thin as 0.7 mm or less, no warpage occurs, and the effect is more remarkable in a molded body having a maximum thickness of 0.6 mm or less.

The molded product of the present invention having the above shape is more effective when used as an optical component. Examples of the optical component include liquid crystal display-related components such as a liquid crystal substrate, a polarizing film, a retardation film, a light guide plate for a liquid crystal display device, and a light diffusing plate; an imaging system lens of a camera, a finder lens, an optical disc pickup lens,
Optical lens such as collimator lens for optical disc, fθ lens of laser beam printer, lens for sensor, projection lens for projector, scanner lens, etc .; rewritable optical disc substrate, optical disc substrate such as digital valuable disc (DVD) substrate, optical card Optical information recording medium substrate; and the like. Among them, the effect is more remarkable when used for a light guide plate, an optical lens, an optical disk, or the like.

In addition to the above purposes, medical and physicochemical tools such as blood test cells, syringes, catheters, petri dishes, pipettes, pipes and tubes; containers such as ampoules, bottles, vials, cups; wrap films, stretch films, It can also be used for shrink films, press-through packaging films, blister packaging films, and other packaging films.

[0088]

EXAMPLES The present invention will be described more specifically below with reference to production examples, examples and comparative examples. However, the present invention is not limited to these production examples and examples. [Parts] and [%] in these examples are based on weight unless otherwise specified.

The various physical properties were measured according to the following methods.

(1) Molecular Weight (Mw) of Block Copolymer Using THF as a solvent, measurement was carried out by GPC at 30 ° C. to obtain Mw in terms of standard polystyrene.

(2) Molecular weight distribution (Mw / Mn) Using THF as a solvent, measurement was carried out by GPC at 30 ° C., Mw and Mn in terms of standard polystyrene were determined, and Mw / Mn was calculated.

(3) Hydrogenation rate The hydrogenation rates of the main chain and aromatic ring of the block copolymer are
¹ H-NMR spectrum was measured and calculated.

(4) Softening temperature (Ts) By a thermo mechanical analyzer (TMA),
It measured in the temperature range of 25-160 degreeC with the temperature rising rate of 10 degreeC / min.

(5) Viscoelastic spectrum A test piece A having a length of 20 mm, a width of 4 mm and a thickness of 1 mm was obtained by press molding, and based on JIS-K7244-4 method.
Loss modulus measuring device (Seiko Instrumen
Tal: DMS6100) was used to measure the change in loss elastic modulus value in the range of −100 ° C. to 150 ° C. at a vibration frequency of 10 Hz and a heating rate of 5 ° C./min. I asked.

(6) Warpage 1 of molded body The length is 216 mm, the width is 288 mm, and the thickness is
A wedge-shaped light guide plate-shaped test piece B (maximum thickness / minimum thickness = 3.4) gradually changing from 2.4 mm to 0.7 mm
Stand at room temperature with the thick part down and stand vertically, 1
Warpage was measured over time and one week. The evaluation standard is
The test piece B is placed on a horizontal plate which is slightly larger than the test piece in such a direction that the plate center part floats, and the case where the maximum value of the gap between the plate and the flat plate in the floating part is 2 mm or less is indicated by "○". ,
The case of exceeding 2 mm was marked as "x".

2 The center portion of a test piece D (DVD substrate shape) having a diameter of 120 mm and a thickness of 0.55 mm has a diameter of 25 mm,
Supported by a 2mm thick spacer and kept horizontal at room temperature,
Warpage was measured after 1 hour and 1 week. The evaluation standard is to measure the size of displacement (zero when there is no warpage) at any one point on the outer circumference with respect to the center point of the circle of the substrate, and when the size of the warp is 300 μmm or less, “○”,
The case of exceeding 300 μmm was marked as “x”.

(7) Deformation diameter of molded body 5 mm, center thickness 4 mm (thick part, maximum thickness), peripheral part thickness 1 mm (thin part, minimum thickness) (thickness of thick part /
Spherical aberration of a test piece C (pickup lens shape) having a thin portion thickness = 4) at 1 hour and 1 week after molding,
It measured using the Mark-IV-xp interference system (made by Zygo). The evaluation criterion is that the spherical aberration is 0.02.
When it was λ or less, it was evaluated as “◯”, and when it exceeded 0.02λ, it was evaluated as “x”.

[Manufacturing Example 1] It was thoroughly dried and replaced with nitrogen.
A stainless steel reactor equipped with a stirrer was charged with 300 parts of dehydrated cyclohexane, 30 parts of styrene and 0.2 part of dibutyl ether, and n-butyllithium solution (hexane solution containing 15%) was stirred at 60 ° C. The polymerization reaction was started by adding 45 parts. The polymerization reaction was carried out for 1 hour. The polymerization conversion rate was 99% or more. Next, 40 parts of a mixed monomer consisting of 20 parts of styrene and 20 parts of butadiene was added to the reaction solution, and a polymerization reaction was further carried out for 1 hour. The polymerization conversion rate was 99% or more. Then, 30 parts of styrene was added to the reaction solution to further add 1 part.
After carrying out the polymerization reaction for a period of time, 0.2 part of isopropyl alcohol was added to the reaction solution to stop the reaction. The polymerization conversion rate was 99% or more.

Next, 400 parts of the above polymerization reaction solution was transferred to a pressure resistant reactor equipped with a stirrer, and a diatomaceous earth-supporting nickel catalyst (manufactured by JGC Chemical Co .; E
22 U) 3 parts were added and mixed. The inside of the reactor was replaced with hydrogen gas, and hydrogen was supplied while stirring the solution.
A hydrogenation reaction was carried out at a temperature of 170 ° C. and a pressure of 4.5 MPa for 6 hours.

After completion of the hydrogenation reaction, the reaction solution was filtered to remove the hydrogenation catalyst, and then the antioxidant Irganox 10 was used.
0.1 part of 10 (manufactured by Ciba Specialty Chemicals Co., Ltd.) was added and dissolved, and a thin film dryer (manufactured by Hitachi Ltd., Contro) was used to remove the solvent under the conditions of 260 ° C. and 10 Torr. The solvent-removed block copolymer was extruded in a molten state into a strand from a die, cooled with water, and then cut into pellets by a pelletizer.

The hydrogenated block copolymer obtained was a block containing a repeating unit derived from styrene (hereinafter abbreviated as St) and a block containing a repeating unit derived from styrene and butadiene (hereinafter S).
(abbreviated as t / Bd), and St were ternary block copolymers. Mw of the block copolymer is 75,
000, Mw / Mn was 1.25, the hydrogenation rates of the main chain and aromatic ring were 99.9%, and Ts was 127 ° C.

[Production Example 2] The polymerization reaction of styrene was conducted for 1 hour in the same manner as in Production Example 1, 10 parts of isoprene was added to the reaction solution, and the polymerization reaction was continued for 1 hour. Then, 20 parts of styrene was newly added to the reaction solution, and the polymerization reaction was continued for 1 hour.
Then, 30 parts of styrene was newly added and the polymerization reaction was continued for 1 hour. Then, 0.2 part of isopropyl alcohol was added to the reaction solution to stop the reaction. The polymerization conversion rate of each polymer block is 99%.
That was all.

Then, a hydrogenation reaction was carried out in the same manner as in Production Example 1, and the solvent was removed to obtain pellets.

The hydrogenated block copolymer obtained was S
t, a block containing a repeating unit derived from isoprene (hereinafter abbreviated as Ip), St, Ip, and S
It was a quinary block copolymer consisting of t. The block copolymer has Mw of 70,000 and Mw / Mn of 1.2.
7, main chain and aromatic ring hydrogenation rate is 99.8%, Ts is 1
It was 16 ° C.

[Production Example 3] Styrene was reduced to 35 parts,
After carrying out the polymerization reaction for 1 hour in the same manner as in Production Example 1, 40 parts of styrene was further added to the reaction solution, and the polymerization reaction was further carried out for 1 hour. Thereafter, 25 parts of a mixed monomer consisting of 10 parts of styrene and 15 parts of isoprene was further added to the reaction solution, and a polymerization reaction was further performed for 1 hour, and then 0.2 parts of isopropyl alcohol was added to the reaction solution to react. Stopped. The polymerization conversion rates of the polymerization reactions of the respective polymer blocks were all 99% or more.

Then, a hydrogenation reaction was carried out in the same manner as in Production Example 1, and the solvent was removed to obtain pellets.

The hydrogenated block copolymer obtained was S
It was a binary block copolymer composed of t and St / Ip. Mw of the block copolymer is 69,000, Mw
/ Mn is 1.18, and the hydrogenation rates of the main chain and aromatic ring are 99.
9% and Ts were 136 degreeC.

[Production Example 4] In a reactor similar to that of Production Example 1,
300 parts of dehydrated cyclohexane, 20 parts of styrene and 0.2 part of dibutyl ether were charged, and n-butyllithium solution (15% hexane solution containing 15%) was stirred at 60 ° C.
0.4 part was added to start the polymerization reaction. After carrying out the polymerization reaction for 1 hour, 60 parts of a mixed monomer consisting of 40 parts of styrene and 20 parts of isoprene was added to the reaction solution, and the polymerization reaction was further carried out for 1 hour. Then, 20 parts of styrene was further added to the reaction solution, and a polymerization reaction was further performed for 1 hour.
The reaction was stopped by adding parts. The polymerization conversion rates of the polymerization reactions of the respective polymer blocks were all 99% or more.

Then, a hydrogenation reaction was carried out in the same manner as in Production Example 1, and the solvent was removed to obtain pellets.

The hydrogenated block copolymer obtained was S
It was a ternary block copolymer composed of t, St / Ip, and St. Mw of the block copolymer is 79,000,
Mw / Mn is 1.2, the hydrogenation rate of the main chain and aromatic ring is 9
9.8% and Ts were 129 degreeC.

[Production Example 5] In a reactor similar to that of Production Example 1,
300 parts of dehydrated cyclohexane, 35 parts of styrene and 0.2 part of dibutyl ether were charged, and n-butyllithium solution (15% content hexane solution) was stirred at 60 ° C.
The polymerization reaction was started by adding 0.3 part. After carrying out the polymerization reaction for 1 hour, 35 parts of styrene was added to the reaction solution, and the polymerization reaction was further carried out for 1 hour. Then, 30 parts of styrene was further added to the reaction solution, and the polymerization reaction was further performed for 1 hour. Then, 0.2 part of isopropyl alcohol was added to the reaction solution to stop the reaction. The polymerization conversion rates of the polymerization reactions of the respective polymer blocks were all 99% or more.

Then, a hydrogenation reaction was carried out in the same manner as in Production Example 1, and the solvent was removed to obtain pellets.

The polymer obtained was hydrogenated polystyrene. Mw of the hydrogenated polystyrene is 130,000,
Mw / Mn is 1.28 and the hydrogenation rate of the main chain and aromatic ring is 9
9.6% and Ts were 144 degreeC.

[Production Example 6] In a reactor similar to that of Production Example 1,
300 parts of dehydrated cyclohexane, 28.5 parts of styrene, 1.5 parts of isoprene, and 0.2 part of dibutyl ether were charged, and 0.3 part of an n-butyllithium solution (15% -containing hexane solution) was stirred at 60 ° C. Addition started the polymerization reaction. After carrying out the polymerization reaction for 1 hour, 30 parts of a mixed monomer consisting of 28.5 parts of styrene and 1.5 parts of isoprene was further added to the reaction solution, and the polymerization reaction was further carried out for 1 hour. Then, styrene 3 in the reaction solution
After 40 parts of a mixed monomer consisting of 8 parts and 2 parts of isoprene was further added and a polymerization reaction was carried out for 1 hour, 0.2 part of isopropyl alcohol was added to the reaction solution to stop the reaction. The polymerization conversion rates of the polymerization reactions of the respective polymer blocks were all 99% or more.

Then, a hydrogenation reaction was carried out in the same manner as in Production Example 1, and the solvent was removed to obtain pellets.

After completion of the hydrogenation reaction, the solvent was removed and pelletized in the same manner as in Production Example 1.

The obtained polymer is a hydrogenated product of a random copolymer composed of styrene and isoprene. The hydrogenated random copolymer has Mw of 120,000 and Mw / M.
n is 1.26, and the hydrogenation rates of the main chain and aromatic ring are 99.6.
% And Ts were 126 ° C.

[Production Example 7] In a reactor similar to that of Production Example 1,
300 parts of dehydrated cyclohexane, 47.5 parts of styrene and 0.2 part of dibutyl ether were charged, and 0.45 parts of n-butyllithium solution (15% content hexane solution) was added with stirring at 60 ° C. to start the polymerization reaction. did. After carrying out the polymerization reaction for 1 hour, 5 parts of butadiene was press-fitted into the reaction solution, and the polymerization reaction was further carried out for 1 hour. After that, 47.5 parts of styrene was further added to the reaction solution to carry out a polymerization reaction for 1 hour, and then 0.2 parts of isopropyl alcohol was added to the reaction solution to stop the reaction. The polymerization conversion rates of the polymerization reactions of the respective polymer blocks were all 99% or more.

Then, a hydrogenation reaction was carried out in the same manner as in Production Example 1, and the solvent was removed to obtain pellets.

The hydrogenated block copolymer obtained was S
t, a block containing a repeating unit derived from butadiene (hereinafter abbreviated as Bd), and St 3
It was a former block copolymer. M of the block copolymer
The w was 80,000, the Mw / Mn was 1.22, the hydrogenation rates of the main chain and the aromatic ring were 99.8%, and the Ts was 130 ° C.

Example 1 The block copolymer pellets obtained in Production Example 1 were dried for 2 hours at 80 ° C. using a hot air dryer in which air was passed, and then an injection molding machine (manufactured by FANUC Co .; AUTOSHOT).
MODEL 30A) and the resin temperature at 270 ° C.
Then, the mold temperature was set to 90 ° C. and injection molding was performed to mold test piece A, test piece B, test piece C and test piece D.

FIG. 1 shows the results of the temperature dependence of the loss elastic modulus measured using the test piece A. As shown in FIG. 1, a test piece A molded from the block copolymer obtained in Production Example 1
It was confirmed that there was no maximum point of the loss elastic modulus in the temperature range of -50 to 100 ° C.

The magnitude of warpage was evaluated 1 hour and 1 week after the test piece B was molded. The results are shown in Table 1.

The magnitude of spherical aberration was evaluated 1 hour and 1 week after the molding of the test piece C. The results are shown in Table 1.

The magnitude of warpage was evaluated one hour and one week after the molding of the test piece D. The results are shown in Table 1.

Examples 2 to 4 Test piece A was prepared in the same manner as in Example 1 except that the block copolymer pellets obtained in Production Examples 2 to 4 were used, and the temperature dependence of loss elastic modulus was evaluated. . The results of the temperature dependence of the loss elastic modulus are shown in FIGS. As shown in FIG.
The test piece A molded with the block copolymer obtained in
It was confirmed that there was no maximum point of the loss elastic modulus in the temperature range of -50 to 100 ° C. As shown in FIG. 3, the test piece A molded from the block copolymer obtained in Production Example 3 had a -5
It was confirmed that the maximum point of the loss elastic modulus was at 0 ° C.
As shown in FIG. 4, it was confirmed that the test piece A molded from the block copolymer obtained in Production Example 4 had the maximum point of the loss elastic modulus at −38 ° C.

Test pieces B to B were prepared in the same manner as in Example 1 except that the block copolymer pellets obtained in Production Examples 2 to 4 were used.
D was prepared and the same evaluation was performed. The results are shown in Table 1.
Are shown together.

Comparative Examples 1 to 3 Test piece A was prepared in the same manner as in Example 1 except that the hydrogenated polystyrene pellets obtained in Production Examples 5 to 7 or the hydride pellets of the random copolymer composed of styrene and isoprene were used. It was prepared and the temperature dependence of the loss elastic modulus was evaluated. The results of the temperature dependence of the loss elastic modulus are shown in FIGS. As shown in FIG. 5, it was confirmed that the test piece A molded from the block copolymer obtained in Production Example 5 had the maximum point of the loss elastic modulus at 5 ° C. As shown in FIG. 6, the test piece A molded from the block copolymer obtained in Production Example 6 had a temperature of 13 ° C.
It was confirmed that there was a maximum point of loss elastic modulus. Figure 7
As shown in (1), it was confirmed that the test piece A molded from the block copolymer obtained in Production Example 7 had the maximum point of the loss elastic modulus at 29 ° C.

Test pieces B to B were prepared in the same manner as in Example 1 except that the block copolymer pellets obtained in Production Examples 5 to 7 were used.
D was prepared and the same evaluation was performed. The results are shown in Table 1.
Are shown together.

[0130]

[Table 1]

As shown in Table 1, in Examples 1 to 4, it was confirmed that each of the test pieces B to D had a small deformation and exhibited good dimensional stability.

On the other hand, in Comparative Example 1, both the test piece B and the test piece D tended to have large warpage. It was confirmed that the test piece C had a small spherical aberration one hour after the molding, but had a large spherical aberration one week after the molding, and the dimensional stability was not good. In Comparative Examples 2 and 3, it was confirmed that all of the test pieces B to D had a large warp and the dimensional stability was not good.

[0133]

As described above, according to the present invention, it is possible to provide a molded product in which the occurrence of warpage and deformation is reduced, and a manufacturing method thereof.

[Brief description of drawings]

FIG. 1 is a graph showing the temperature dependence of loss elastic modulus of a test piece made of the block copolymer obtained in Production Example 1.

FIG. 2 is a graph showing the temperature dependence of the loss elastic modulus of a test piece made of the block copolymer obtained in Production Example 2.

FIG. 3 is a graph showing the temperature dependence of the loss elastic modulus of a test piece made of the block copolymer obtained in Production Example 3.

FIG. 4 is a graph showing the temperature dependence of loss elastic modulus of a test piece made of the block copolymer obtained in Production Example 4.

FIG. 5 is a graph showing the temperature dependence of the loss elastic modulus of the test piece made of the block copolymer obtained in Production Example 5.

FIG. 6 is a graph showing the temperature dependence of the loss elastic modulus of a test piece made of the block copolymer obtained in Production Example 6.

FIG. 7 is a graph showing the temperature dependence of loss elastic modulus of a test piece made of the block copolymer obtained in Production Example 7.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G11B 7/26 531 G11B 7/26 531 // C08L 53:00 C08L 53:00 F term (reference) 4F071 AA12 AA12X AA14 AA14X AA15 AA15X AA20 AA20X AA21 AA21X AA22 AA22X AA75 AF20 AH19 BB05 BC03 BC07 4J026 HA06 HA16 HA20 HA26 HA32. JA43 NA05 5D121 DD05

Claims (7)

[Claims] 1. A polymer block [A] containing 90% by weight or more of a repeating unit [1] represented by the following formula (1).
And a repeating unit [2] represented by the following formula (2) and / or a repeating unit [3] represented by the following formula (3), a total of 3
And a polymer block [B] containing 0% by weight or more, and the maximum point of the loss elastic modulus is 5 to 5 in the viscoelastic spectrum.
A molded product composed of a block copolymer not within the range of 29 ° C. [Chemical 1] (In the formula, ^{R 1} represents an alkyl group of a hydrogen atom, or a C 1 to ^{20, R 2-1 2} is ^{R 2, R 3, R 4} , R
^{5, R 6, R 7,} R 8, R 9, R 10, a ^{R 11} and ^{R 12,} each independently represent a hydrogen atom, a carbon number 1-2
It represents any of an alkyl group having 0, a hydroxyl group, an alkoxy group having 1 to 20 carbon atoms, and a halogen group. ) [Chemical 2] (In the formula, R ¹³ and R ¹⁴ are each independently a hydrogen atom,
It represents any of an alkyl group having 1 to 20 carbon atoms, a halogen group and an aryl group. ) [Chemical 3] (In the formula, R ¹⁵ and R ¹⁶ each independently represent a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, a halogen group or an aryl group.) 2. A plate-like material, the thickness of which is not constant, and the ratio (a / b) of the maximum thickness (a) and the minimum thickness (b) is 1.2.
The molded body according to claim 1, which is the above. 3. The molded product according to claim 1, which is plate-shaped and has a maximum thickness of 0.7 mm or less. 4. The molded product according to claim 1, which is an optical component. 5. The molded product according to claim 4, wherein the optical component is any one of a light guide plate, an optical lens, and an optical disk. 6. A polymer block [A] containing 90% by weight or more of a repeating unit [1] represented by the following formula (1).
And a repeating unit [2] represented by the following formula (2) and / or a repeating unit [3] represented by the following formula (3), a total of 3
And a polymer block [B] containing 0% by weight or more, and the maximum point of the loss elastic modulus is 5 to 5 in the viscoelastic spectrum.
A method for producing a molded product, which comprises melt-molding a block copolymer not within the range of 29 ° C. [Chemical 4] (In the formula, ^{R 1} represents an alkyl group of a hydrogen atom, or a C 1 to ^{20, R 2-1 2} is ^{R 2, R 3, R 4} , R
^{5, R 6, R 7,} R 8, R 9, R 10, a ^{R 1 1} and ^{R 12,} each independently represent a hydrogen atom, 1 to carbon atoms
It represents one of a 20 alkyl group, a hydroxyl group, an alkoxy group having 1 to 20 carbon atoms, and a halogen group. ) [Chemical 5] (In the formula, R ¹³ and R ¹⁴ are each independently a hydrogen atom,
It represents any of an alkyl group having 1 to 20 carbon atoms, a halogen group and an aryl group. ) [Chemical 6] (In the formula, R ¹⁵ and R ¹⁶ each independently represent a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, a halogen group or an aryl group.) 7. The method for producing a molded article according to claim 6, wherein the melt molding is injection molding.