JPH11171998A - Polyarylene sulfide and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a polyarylene sulfide not only excellent in mechanical strengths such as a tensile strength, a flexural strength and an impact strength, but also capable of being molded by various molding methods because the polyarylene sulfide causes extremely small amount of burr when molding, and is excellent in fluidity when molding and further to provide a production method thereof. SOLUTION: This polyarylene sulfide is the one including the polyarylene sulfide having amino group at the terminal, having the molar ratio of the terminal amino group to benzene ring regulated so as to be (0.001-0.1)/(0.9-0.999) and 1.05-1.50 N-value of a branching coefficient calculated from the relation between the melt viscosity η of the resin and the shear rate 7. The resin is produced by synthesizing a polyarylene sulfide oligomer and further carrying out the polymerization reaction by adding an amination agent and a branching agent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a polyarylene sulfide and a method for producing the same. More specifically, the present invention relates to a polyarylene sulfide containing a polyarylene sulfide having an amino group at a terminal and showing a specific branching index, and a method for producing the same.

[0002]

2. Description of the Related Art Polyarylene sulfide (hereinafter referred to as PA)
Resins are sometimes known as engineering plastics having excellent mechanical strength, heat resistance, chemical resistance and the like, and molded products thereof are used for various purposes.
However, it has been pointed out that the formation of polyarylene sulfide has a drawback of generating burrs.

Various methods have been proposed as methods for reducing the amount of burrs. For example, there is a method of introducing a large number of branches by thermal crosslinking. In this case, although the amount of burrs is reduced, the mechanical properties are reduced, and there is a possibility that a decomposed gas is derived (Japanese Patent Laid-Open No. 64-9266). Gazette). Also,
A method of adding a polycarbodiimide compound (JP-A-61
-14251), a method of adding an alkali metal compound of an organic phosphate (JP-A-1-54066), and a method of adding an organoaluminum (JP-A-2-191666).
Japanese Patent Application Publication No. 9-1010) and a method of adding a carbon-based substance
No. 0412) have been proposed, but none of them has been sufficient to reduce the amount of burrs.

[0004] Further, it may be complexed with other resins (Japanese Patent Application Laid-Open No. 4-213357, etc.), copolymerized (Japanese Patent Application Laid-Open No. 8-134352, etc.), or modified polyarylene sulfide (Japanese Patent Application Laid-Open No. Hei 5-134352). Japanese Patent Application Laid-Open No. 170708/1990) have also been proposed, but these methods did not sufficiently reduce the amount of burrs. Alternatively, even though the amount of burrs can be reduced, the mechanical strength may be reduced as a result, and at present, there is no technology that sufficiently satisfies both the reduction of burrs and the mechanical strength.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has excellent mechanical strength such as tensile strength, bending strength, and impact resistance, and has a very small amount of burr generated during molding. Another object of the present invention is to provide a polyarylene sulfide which is excellent in flow moldability and can be variously molded, and a method for producing the same.

[0006]

Means for Solving the Problems As a result of intensive studies, the present inventors can achieve the above object by using a polyarylene sulfide containing a polyarylene sulfide having an amino group at the terminal and showing a specific branching index. I found that. The present invention has been made based on such findings.

That is, the present invention provides the following polyarylene sulfide and a method for producing the same. (1) A polyarylene sulfide containing a polyarylene sulfide having an amino group at a terminal, wherein the molar ratio of the terminal amino group to a benzene ring is 0.001 to 0.1 / 0.9.
0.999, and the branching index N value is 1.05-1.5.
Polyarylene sulfide which is 0. Where the branch index N
The values refer to the melt viscosity η and the shear rate γ of the resin,
gη as a function of logγ logη = f (logγ)
Is a value represented by the following equation (1).

[0008]

(Equation 2)

(Wherein η _L represents the melt viscosity of the linear polyarylene sulfide, and η _B represents the melt viscosity of the branched polyarylene sulfide for which the branching index N value is to be determined.
∂logη / ∂logγ | γ _{= 200} means that the partial differential ｌｏlogη / ∂logγ of logη by logγ is γ
= 200 (sec ^-1 ). (2) synthesizing a polyarylene sulfide oligomer,
The method for producing a polyarylene sulfide according to claim 1, wherein a polymerization reaction is further performed by adding an aminating agent and a branching agent.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below. 1. A polyarylene sulfide containing a polyarylene sulfide having an amino group at a terminal, wherein the molar ratio of the terminal amino group to a benzene ring is 0.001 to 0.1 / 0.9 to 0.9.
0.999, and the branch index N value described later is 1.05.
(1) Polyarylene sulfide containing amino group-terminated polyarylene sulfide The “polyarylene sulfide containing amino group-terminated polyarylene sulfide” according to the present invention includes:
It may be composed of only polyarylene sulfide having an amino group at the terminal, or may be a mixture of polyarylene sulfide having an amino group at the terminal and polyarylene sulfide not having an amino group at the terminal.

The polyarylene sulfide is specifically a polymer containing a repeating unit represented by the structural formula -Ar-S- (where Ar is an arylene group) in an amount of 70 mol% or more. The typical one is represented by the following structural formula (I)

[0012]

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(Wherein R ¹ is an alkyl group having 6 or less carbon atoms, an alkoxy group, a phenyl group, a carboxylic acid / metal salt,
A substituent selected from an amino group, a nitro group, a halogen atom such as fluorine, chlorine, and bromine, and m is an integer of 0 to 4. N is an average degree of polymerization and is in the range of 1.3 to 30), and is a polyphenylene sulfide having a repeating unit represented by at least 70 mol%.

As the PAS, a homopolymer or copolymer (hereinafter abbreviated as PPS) containing at least 70 mol%, more preferably at least 80 mol% of a paraphenylene sulfide unit as a repeating unit is exemplified. Examples of the copolymerizable structural unit include a metaphenylene sulfide unit, an orthophenylene sulfide unit, a p, p′-diphenylene ketone sulfide unit, a p, p′-diphenylene sulfone sulfide unit, a p, p′-biphenylene sulfide unit, and p , P'-diphenylene ether sulfide unit, p, p'-diphenylene methylene sulfide unit, p, p'-diphenylene cumenyl sulfide unit, naphthyl sulfide unit and the like. PAS
Preferable examples include polyphenylene sulfide represented by the following structural formula (II) (hereinafter sometimes referred to as PPS).

[0015]

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The term "polyarylene sulfide having an amino group at the terminal" refers to the above-mentioned polyarylene sulfide in which both terminals or one terminal of the polymer chain is not -SH but an amino group such as -NH ₂ . (2) In the case where the polyarylene sulfide according to the present invention is a mixture of a polyarylene sulfide having an amino group at the terminal and a polyarylene sulfide having no amino group, the molar ratio between the terminal amino group and the benzene ring is as follows. , The molar ratio between the terminal amino group and all benzene rings. The term “all benzene rings” refers to the total number of benzene rings in polyarylene sulfide having an amino group at the terminal and polyarylene sulfide having no amino group at the terminal. When the molar ratio between the terminal amino group and the benzene ring is 0.001 to 0.1.
/0.9 to 0.999, preferably 0.005 to 0.05 / 0.9.
5 to 0.995. If the molar ratio between the terminal amino group and the benzene ring exceeds 0.1 / 0.9, the molecular weight may be low as polyarylene sulfide. 0.
If it is less than 001 / 0.999, the mechanical strength may be reduced. (3) In the polyarylene sulfide according to the present invention, the following branching index N value is from 1.05 to 1.50, preferably from 1.10 to 1.30. If it exceeds 1.5, mechanical strength, particularly toughness, may decrease. If it is less than 1.05, reduction of burrs during molding may not be achieved. Here, the branching index N value means the melt viscosity η and the shear rate γ of the resin.
For log η as a function of log γ, log η = f
When represented by (logγ), it is a value represented by the following equation (1).

[0017]

(Equation 3)

(Where η _L is the melt viscosity of the linear polyarylene sulfide, and η _B is the melt viscosity of the branched polyarylene sulfide for which the branching index N value is to be obtained.
∂logη / ∂logγ | γ _{= 200} means that the partial differential ｌｏlogη / ∂logγ of logη by logγ is γ
= 200 (sec ^-1 ). Incidentally, regarding the melt viscosity η and the shear rate γ, log η
Is expressed as log η = f (log γ) as a function of log γ, several points of melt viscosity value at a certain shear rate are obtained from the following relational expression, and several points are subjected to mathematical processing such as least square method. It can be functionalized.

That is, the shear rate and the shear stress can be obtained from the load required to extrude a sample at a certain extrusion rate by using a capillary rheometer having a certain cylinder and an orifice based on the following formula. Value.・ Shear rate (sec ⁻¹ ) = {4 ・ (SR) ²・ Extrusion rate (mm / min)} / (10 × 60 × R ³ ) ・ Shear stress (dyne / cm ² ) = {Load (kg) ・9
80 · 10 ³ } / {π · (SR) · 2 · L} In these, SR: cylinder radius R: orifice radius L: orifice length At this time, the melt viscosity is obtained by the following equation.

Melt viscosity (poise) = shear stress (d)
yne / cm^Two) / Shear rate (sec)^-1Further, in the above formula (1), the linear polyarylene
Ruffid is the branch point for which the branch index N is to be obtained.
Consists of the same repeating units as Real Release Sulfide,
Furthermore, in the case of a copolymer, the constituent monomer ratio is the same,
Logarithmic viscosity [η] _ihn= 0.15-0.30 deciliter / g
Is a linear polyarylene sulfide. Immediately
That is, for example, the above-mentioned branched polyarylene sulfide is produced.
Method without adding a branching agent and crosslinking
Polyarylene sulfide, etc. produced under non-existent conditions
Is applicable. 2. Method for producing polyarylene sulfide according to the present invention
The method for producing a polyarylene sulfide according to the present invention
Although there is no particular limitation, preferably,
First, a lensulphide oligomer is synthesized, and then
Method for further performing a polymerization reaction by adding a nolating agent and a branching agent
It is.

Hereinafter, the production method will be described in detail. (1) Synthesis of polyarylene sulfide oligomer A polyarylene sulfide oligomer can be produced by a known method of polycondensing a dihaloaromatic compound with a sulfur source in an organic polar solvent. Specifically, by introducing a liquid or gaseous sulfur compound into an aprotic solvent containing lithium hydroxide, lithium hydroxide and the sulfur compound are directly reacted, and the dihalogenated aromatic compound is contained in the reaction solution. A preferred method is to introduce a group compound and carry out polycondensation. The reaction between lithium hydroxide and a sulfur compound is Li / S = 2
Those performed under the above (molar ratio) conditions are preferred.

As the aprotic organic solvent used, generally, aprotic polar organic compounds (for example, amide compounds, lactam compounds, urea compounds, organic sulfur compounds, cyclic organic phosphorus compounds, etc.) are used as single solvents. Or as a mixed solvent. Among these aprotic polar organic compounds, amide compounds include, for example, N, N-dimethylformamide, N, N-diethylformamide, N, N
-Dimethylacetamide, N, N-diethylacetamide, N, N-dipropylacetamide, N, N-dimethylbenzoic acid amide, and the like, and examples of the lactam compound include caprolactam, N-methylcaprolactam, and N-ethylcaprolactam. , N-isopropylcaprolactam, N-isobutylcaprolactam, N-normalpropylcaprolactam, N-normalbutylcaprolactam, N-cyclohexylcaprolactam, etc.
-Alkylcaprolactams, N-methyl-2-pyrrolidone (NMP), N-ethyl-2-pyrrolidone, N-isopropyl-2-pyrrolidone, N-isobutyl-2-pyrrolidone, N-normalpropyl-2-pyrrolidone, N
-Normal butyl-2-pyrrolidone, N-cyclohexyl-2-pyrrolidone, N-methyl-3-methyl 2-pyrrolidone, N-ethyl-3-methyl-2-pyrrolidone,
N-methyl-3 4,5-trimethyl-2-pyrrolidone, N-methyl-2-piperidone, N-ethyl-2-piperidone, N-isopropyl-2-piperidone, N-methyl-6-methyl-2-piperidone , N-methyl-3-
Ethyl-2-piperidone and the like can be mentioned.

The urea compounds include, for example, tetramethylurea, N, N'-dimethylethyleneurea, N,
N'-dimethylpropylene urea; and the organic sulfur compound includes, for example, dimethyl sulfoxide, diethyl sulfoxide, diphenyl sulfone, 1-
Methyl-1-oxosulfolane, 1-ethyl-1-oxosulfolane, 1-phenyl-1-oxosulfolane, etc. Examples of the cyclic organic phosphorus compound include 1-methyl-1-oxophospholane, -Normalpropyl-1-oxophosphorane, 1-phenyl-1-
Oxophosphorane and the like can be mentioned.

Each of these various aprotic polar organic compounds may be used alone or in combination of two or more.
Furthermore, it can be used by mixing with other solvent components that do not interfere with the object of the present invention. Among the above-mentioned various aprotic organic solvents, preferred are N-alkylcaprolactam and N-alkylpyrrolidone, and particularly preferred is N-methyl-2-pyrrolidone. (2) Synthesis of polyarylene sulfide according to the present invention An aminating agent and a branching agent, and if necessary, lithium hydroxide and water are added to the reaction solution containing the polyarylene sulfide oligomer, and the temperature is raised. It can be obtained by causing a reaction.

The molar ratio between the terminal amino group and the benzene ring is
It can be controlled by the amount of the aminating agent. The aminating agent is not particularly limited, for example,
(Ii) a combination of an amino group and a thiol group, (ii) a combination of an amino group and a thiol group and an alkaline compound, and (iii) a compound having an amino group and a thiolate group (-SM; M is an alkali or alkaline earth metal). And (i)
To (iii) may be appropriately combined. Examples of (i) include para-aminothiophenol, ortho-aminothiophenol, aminoalkylmercaptan and the like, and para-aminothiophenol and ortho-aminothiophenol are preferred. As the alkaline compound of (ii), in principle, any compound capable of converting the thiol group of the compound of (i) to a thiolate group may be used, and specifically, an alkali metal or earth metal hydroxide or A carbonate may be mentioned, and a mixture of a hydroxide and a carbonate may be used. (Iii) as paraaminothiophenol,
Metal salts such as orthoaminothiophenol and aminoalkylmercaptan can be mentioned.

In the present invention, orthoaminothiophenol is preferably used. The branching agent is not particularly limited.
Like 2,4-trichlorobenzene, 3 per molecule
Polyhalogen aromatic compounds having more than one halogen are preferred. Reaction Conditions The reaction of the PAS oligomer with the aminating agent and the branching agent in the aprotic organic solvent is not particularly limited, but the following conditions are preferred.

(I) Reaction Concentration and Mixing Ratio The reaction concentration of polyarylene sulfide is preferably 50 to 500 g per liter of aprotic organic solvent.
100-400 g is more preferred. If the amount is less than 50 g, the productivity may decrease. If the amount exceeds 500 g, the reaction rate may decrease and side reactions may occur.

The compounding ratio of the aminating agent is preferably from 0.2 to 10 mol%, more preferably from 0.5 to 5 mol%, based on 1 mol of the polyarylene sulfide. If it is less than 0.2 mol%, the proportion of terminally aminated PAS in the produced PAS becomes small, which may cause a decrease in mechanical strength.
On the other hand, if it exceeds 10 mol%, the molecular weight of the resulting PAS may be reduced.

The mixing ratio of the branching agent is preferably from 0.05 to 5 mol%, more preferably from 0.2 to 2 mol%, per 1 mol of the polyarylene sulfide. If the amount is less than 0.05 mol%, the amount of the introduced branch structure may decrease, and the amount of burrs generated may increase. On the other hand, if it exceeds 5 mol%, the number of branches becomes too large, and gelation may occur during polymerization, or the strength of the resulting polymer may be reduced. (Ii) Timing of addition of the aminating agent and the branching agent The method of adding the aminating agent and the branching agent to the reaction solution containing the polyarylene sulfide oligomer from the beginning, and the method of adding during the reaction are also performed, although there is no particular limitation. It is. From the viewpoint of the process, preferably, a method of adding from the beginning is used. (Iii) Reaction temperature The reaction temperature is preferably from 180 ° C to 300 ° C,
280 ° C. is more preferred. If the temperature is lower than 180 ° C., amination may not proceed sufficiently, and if it exceeds 300 ° C., the PAS may be deteriorated. (Iv) Reaction time The reaction time cannot be specified unconditionally, but is usually 30 minutes to 3 minutes.
0 hours is preferable, and 1 to 15 hours is more preferable. 3
If the reaction time is less than 0 minutes, the reaction may be insufficient.
Beyond 0 hours, side reactions occur and terminal aminated P
The molecular weight of AS may decrease.

Polymer recovery and post-treatment The recovery and post-treatment methods of the polyarylene sulfide obtained as described above are not particularly limited. After filtration, the polymer is first washed with water to remove salts, and then organically removed to remove oligomers. Heating with solvent (acetone, alcohol),
Washing under pressure, washing with acid for alkali neutralization, and washing with water for removing the solvent and salt are preferably performed.

After washing, hot air drying at 100 ° C. or more
It is more preferable to perform the air drying for 5 hours or more. EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples.
Will be described. The evaluation was performed by the following method. (1) Solution viscosity (η_inh) Use an Ubbelohde viscometer to measure the concentration of 0.4 g / deciliter.
At 235 ° C in α-chloronaphthalene solution
After being dissolved for 30 minutes, the measurement was performed at 206 ° C. (2) Melt viscosity (η_m) Capillary rheometer (Toyo Seiki Co., Ltd., Capirog
Resin temperature 300 ℃, orifice
1 mm radius and 20 mm orifice length
Was calculated by the following calculation method. (3) Branching index N value The value of the melt viscosity at a certain shear rate is determined at 5 or more points.
For each log value, log η is calculated as
Find logη = f (logγ) as a function of gγ,
The branch index N value was calculated by the method described above. (4) Terminal amino group content (mol%)
The NH stretching vibration (N-H, 3370 cm^-1) And fragrance
Group hydrogen stretching vibration (benzene-H, 3066 cm) ^-1) With
It was calculated from the absorbance ratio. (5) Burr amount The amount of burr of the test piece molded with the cassette mold
It was visually observed with a shadow machine and the average was determined. [Example 1] Stainless steel 1 with a stirrer equipped with stirring blades
In a 0 liter autoclave, add N-methyl-2-pyrroli
4.5 liters of don (NMP), paradichlorobenzene
(PDCB) 1323.0 g and lithium sulfide (Li
_TwoS) Charge 413.5 g, and cool to 200 ° C under nitrogen atmosphere.
And react for 5 hours.
Oligomers were synthesized.

Next, the reaction solution was once returned to room temperature, and into it, 8.2 g of 1,2,4-trichlorobenzene, 22.6 g of orthoaminothiophenol, 4.3 g of lithium hydroxide,
83.0 g of pure water was added and reacted at 260 ° C. for 3 hours under a nitrogen atmosphere. After the reaction yield, the internal temperature was lowered to 60 ° C., and the contents were taken out and filtered. Then, three times with 10 liters of ion-exchanged water, a temperature 1 containing 20 ml of acetic acid.
Washing was performed once with 5 liters of NMP at 50 ° C. and four times with 10 liters of ion-exchanged water to remove by-products such as lithium chloride and oligomers.

The polymer thus obtained was dried at 100 ° C. under reduced pressure to obtain a white, granular polyphenylene sulfide polymer. The solution viscosity (η _inh ) of this polymer is 0.20 deciliter / g, and the melt viscosity (η _m ) is 100 P
a.s, the branching index (N) was 1.15, and the molar ratio of amino groups to the total amount of benzene rings was 0.80%. The evaluation sample was prepared as follows.

The above polyphenylene sulfide granules 600
g to a coupling agent (manufactured by Toray Silicone Co., trade name: SH
6040) was evenly sprinkled with a disposable syringe, placed in a polypropylene bag, and dry-blended. Thereafter, 400 g of glass fiber (trade name: JAFT591 manufactured by Asahi Glass Co., Ltd.) was placed in the bag, and dry blending was performed slowly so that the glass fiber was not broken. This was pelletized with a 20 mmφ single screw extruder.

Using the pellets thus obtained, 5
A burr evaluation sample was produced by a 0t injection molding machine (mold temperature: 135 ° C., holding pressure: 20%). In addition, other evaluation samples were produced using a 30 t injection molding machine (mold temperature: 135 ° C., injection pressure: 49%). Table 1 shows the results.

[0036]

[Table 1]

[Example 2] In Example 1, pure water 8
The procedure was the same as in Example 1, except that 49.7 g of pure water was used instead of adding 3.0 g. The solution viscosity (η _inh ) of the obtained polymer is 0.22 deciliter / g, and the melt viscosity (η
_m ) was 250 Pa · s, the branching index (N) was 1.32, and the molar ratio of amino groups to the total amount of benzene rings was 0.81%.

The results are shown in Table 1. Example 3 Example 1 was repeated except that 22.6 g of orthoaminothiophenol and 83.0 g of pure water were used instead of 33.9 g of orthoaminothiophenol and 33.2 g of pure water. The same was done. The solution viscosity (η _inh ) of the obtained polymer is 0.25 deciliter / g, the melt viscosity (η _m ) is 160 Pa · s, and the branching index (N) is 1.3.
9. The molar ratio of amino groups to the total amount of benzene rings is 1.20.
%Met.

Table 1 shows the results. Example 4 Example 1 was repeated except that 22.6 g of orthoaminothiophenol and 83.0 g of pure water were used instead of 56.6 g of orthoaminothiophenol and 0 g of pure water. Done. The solution viscosity (η _inh ) of the obtained polymer was 0.23 deciliter / g, the melt viscosity (η _m ) was 280 Pa · s, and the branching index (N) was 1.10.
The molar ratio of amino groups to the total amount of benzene rings was 2.0%.

The results are shown in Table 1. Example 5 In Example 1, 8.2 g of 1,2,4-trichlorobenzene, 22.6 of orthoaminothiophenol were used.
g, 4.3 g of lithium hydroxide and 83.0 g of pure water, instead of adding 32.8 g of 1,2,4-trichlorobenzene, 11.3 g of orthoaminothiophenol, 2.2 g of lithium hydroxide and 165 of pure water. The procedure was performed in the same manner as in Example 1 except that the amount was changed to 0.8 g. The solution viscosity (η _inh ) of the obtained polymer is 0.25 deciliter / g, and the melt viscosity (η _m ) is 260P.
a.s, the branching index (N) was 1.45, and the molar ratio of amino groups to the total amount of benzene rings was 0.550%.

The results are shown in Table 1. Comparative Example 1 In Example 1, 1,2,4-trichloro
8.2 g of robenzene, 22.6 orthoaminothiophenol
g, 4.3 g of lithium hydroxide and 83.0 g of pure water
Instead, 1,2,4-trichlorobenzene 0g, ortho
Aminothiophenol 0g, lithium hydroxide 0g, pure water
The procedure was performed in the same manner as in Example 1 except that the amount was changed to 82.9 g. Get
Solution viscosity (η_inh) Is 0.23 desilit
/ G, melt viscosity (η _m) Is 185 Pa · s, branching index
(N) is 1.01, the model based on the total benzene ring content of the amino group.
Was 0%.

The results are shown in Table 1. Comparative Example 2 In Example 1, 8.2 g of 1,2,4-trichlorobenzene and 22.6 of orthoaminothiophenol were used.
g, 4.3 g of lithium hydroxide and 83.0 g of pure water, instead of adding 16.4 g of 1,2,4-trichlorobenzene, 0 g of orthoaminothiophenol, 0 g of lithium hydroxide,
The same operation as in Example 1 was carried out except that the amount of pure water was changed to 165.8 g. The solution viscosity (η _inh ) of the obtained polymer was 0.24 deciliter / g, the melt viscosity (η _m ) was 135 Pa · s,
The branching index (N) was 1.30, and the molar ratio of amino groups to the total amount of benzene rings was 0%.

Table 1 shows the results. Comparative Example 3 In Example 1, 8.2 g of 1,2,4-trichlorobenzene and 22.6 of orthoaminothiophenol were used.
g, 4.3 g of lithium hydroxide and 83.0 g of pure water, instead of adding 0,1 g of 1,2,4-trichlorobenzene, 33.9 g of orthoaminothiophenol, and 4.3 g of lithium hydroxide.
g and pure water 49.7 g. The solution viscosity (η _inh ) of the obtained polymer was 0.25 deciliter / g, the melt viscosity (η _m ) was 200 Pa · s,
The branching index (N) was 1.000, and the molar ratio of amino groups to the total amount of benzene rings was 1.20%.

The results are shown in Table 1.

[0045]

As described above, according to the present invention, in addition to being excellent in mechanical strength such as tensile strength, bending strength, impact resistance, etc., the amount of burrs generated during molding is extremely small, and since it is excellent in flow moldability, various effects can be obtained. Can be obtained.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Minoru Chiga 1-1, Anesaki Beach, Ichihara City, Chiba Prefecture (72) Koji Namiki, 1280 Kamiizumi, Sodegaura City, Chiba Prefecture

Claims (2)

[Claims] 1. A polyarylene sulfide comprising an amino-terminated polyarylene sulfide,
The molar ratio of the terminal amino group to the benzene ring is 0.001 to
0.1 / 0.9 to 0.999, and the branching index N value is:
Polyarylene sulfide which is 1.05 to 1.50. Here, the branching index N value means the melt viscosity η and the shear rate γ of the resin.
For log η as a function of log γ, log η = f
When represented by (logγ), it is a value represented by the following equation (1). (Equation 1) (In the formula, η _L represents the melt viscosity of the linear polyarylene sulfide, and η _B represents the melt viscosity of the branched polyarylene sulfide for which the branching index N value is to be obtained.
∂logγ | γ _{= 200} means that in the partial differential ｌｏlogη / ∂logγ of logη by logγ, γ = 200 (s
ec ^-1 ). ) 2. The method for producing a polyarylene sulfide according to claim 1, wherein a polyarylene sulfide oligomer is synthesized, and then an aminating agent and a branching agent are added to carry out a polymerization reaction.