JPH07107130B2 - Polyarylene thioether molding composition - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a polyarylene thioether molding composition. Specifically, the present invention comprises a cross-linked polyarylene thioether which exhibits a gel state when melted and is blended with a polyarylene thioether of a base resin as an agent for improving the burr property (hardness of burr). It relates to a significantly improved molding composition,
More specifically, the repeating unit Melt viscosity (310 ℃, shear rate 5 / sec)
To 100 parts by weight of a resin (component A) consisting of 10 to 5 × 10 ⁴ poise of polyarylene thioether, melt viscosity (310 ° C.,
Cross-linked polyarylene thioether (ingredient B) showing a gel state when melted at a shear rate of 5 / sec 5 × 10 ⁵ to 1 × 10 ⁹ poise
0.2 to 90 parts by weight and a fibrous filler, an inorganic filler or a mixture thereof (component C) in an amount of 0 to 400 parts by weight with respect to 100 parts by weight of component (A + B), which has improved burr properties. It relates to an arylene thioether molding composition.

2. Description of the Related Art Polyarylene thioethers represented by polyphenylene thioethers (hereinafter abbreviated as PATE) are being used in various fields as engineering plastics having excellent heat resistance, flame retardancy, chemical resistance and the like. PATE
Is usually a crystalline polymer, and taking advantage of its characteristics,
In particular, it is often used in the field of injection molded products.

PATE as a base resin for a conventional molding composition has a relatively low molecular weight PATE which is subjected to a thermal crosslinking treatment (CURING), that is, a treatment for forming a crosslinked structure, a branched structure or the like by heat treatment to increase the apparent melt viscosity. It is a cross-linked PATE, which has excellent workability in injection molding and the like, and is also characterized in that "burr characteristics" at the time of injection molding, that is, the property that burrs hardly occur, is usually satisfied. However, on the other hand, this is because the mechanical strength is insufficient and brittle, the coloring is severe, and the viscosity changes with time during melt processing (that is, the irreversible increase in viscosity) is large, and it is necessary to select appropriate molding conditions. There are many problems such as difficulty and difficulty in recycling the molding waste, which is uneconomical.

On the other hand, the inventors have developed a method for economically producing a substantially linear high molecular weight PATE by adding water and raising the temperature during the polymerization (JP-A-61-7332). See the bulletin).

Since the substantially linear PATE obtained by this method has a sufficiently large molecular weight, it can be directly applied to various melt processing such as injection molding without thermal crosslinking treatment or crosslinking during the polymerization reaction. it can. Such a substantially linear uncrosslinked PATE has high mechanical strength due to its molecular structure, very little coloring, easy toning, and further, a change in melt viscosity with time during melt processing. It is extremely small and easy to mold, and it is easy to reuse the processing waste,
It has major features such as being extremely economical. On the other hand, however, it has been found that the composition having the substantially linear uncrosslinked high molecular weight PATE as a base resin has a problem that the burr property upon injection molding is slightly unsatisfactory.

On the other hand, even with a composition using a conventional cross-linked PATE (described above) having a good burr property as a base resin, the burr property is still insufficient in the injection molding of precision molded products. .

The inventors diligently studied a method for improving the burr property of an uncrosslinked PATE composition at the time of injection molding and the burr property at the time of injection molding of a precision molded product which is also observed in the crosslinked PATE.

First, an attempt was made to improve the burr characteristics by increasing the viscosity of PATE of the base resin of the injection molding composition. However, it has been found that the viscosity of the composition for injection molding also increases in proportion to the increase in the viscosity of the base resin, deteriorating the processability (fluidity etc.) during injection molding.

Next, the inventors of the present invention disclosed in Japanese Patent Laid-Open Nos. 59-223,753 and 52
-149,348, JP-A-55-127,002, JP-A 59-1
1,357, JP 53-66,565, JP 53-22,36
The method described in Japanese Patent No. 3, etc., that is, the melt flow value (ASTM
-D 1238 method: 600 ° F, 5kg load) about 5 to 200 (g / 10min), melt viscosity η ^* (310 ° C, shear rate 5 / sec) about 1 × 10 ³ to 1 × 10 ^The method of adding high viscosity PATE equivalent to ⁵ poise to the base resin was additionally tested. However, it has been found that the method of adding PATE having such a viscosity cannot achieve effective improvement of the burr characteristics unless a large amount of PATE is added. However, it was found that when a large amount of PATE having such a viscosity is added, the viscosity of the composition also rises and the workability during injection molding is significantly deteriorated.

The inventors have further searched for a method for effectively improving only the burr characteristics without substantially adversely affecting the processability during injection molding and the physical properties of the obtained molded product. As a method that has not been considered at all in the past, highly cross-linked PATE (which turns into a gel when melted) is added to the base polymer as a burr property improver to improve the processability and physical properties of the resulting molded product. It was found that the burr characteristics were significantly improved without substantially adversely affecting the.
Further, as an additional effect, it was found that the crosslinked PATE also exerts a crystallization promoting effect at the time of injection molding and a releasing property improving effect as a flow orientation agent.

Furthermore, it has been found that a system in which the crosslinked PATE is added in a slightly larger amount improves not only the above-mentioned effects but also the weld characteristics during injection molding. The present invention has been completed based on these findings.

An object of the present invention is to provide a PATE molding composition having excellent burr properties, high thermal stability, easy melt processing, and capable of recycling molding waste.

The polyarylene thioether molding composition having improved burr properties according to the present invention comprises 100 parts by weight of the following component A, 0.2 to 90 parts by weight of the following component B and the following component C. (A + B) 0 to 400 parts by weight per 100 parts by weight.

Component A: Repeating unit Melt viscosity (temperature 310 ° C, shear rate 5 /
A resin consisting of polyarylene thioether with a sec) of 10 to 5 × 10 ⁴ poise.

Component B: Melt viscosity (temperature 310 ° C, shear rate 5 / sec) is 5 x 10 ^5.
A cross-linked polyarylene thioether which exhibits a gel state when melted at 1 × 10 ⁹ poise.

Component C: Fibrous filler, inorganic filler or mixture thereof.

Polyarylene thioether molding composition of the present invention,
It is a composition prepared by blending component A as a base polymer and component B as a burr property improving material, preferably a fibrous filler and / or an inorganic filler. The term "compounded" as used herein means that, in addition to the components listed above, other purposeful formulations may be included.

Component A Component A of the base polymer, which is the main constituent in the composition of the present invention, is PATE. Here, PATE generally means one having a repeating unit Ar—S (Ar: arylene group) as a main constituent element, but in the present invention, one having a paraphenylene group as a main constituent element as an arylene group is component A. Constitute.

Those having a paraphenylene group as a main constituent as an arylene group, that is, those comprising a paraphenylene group or containing 50 mol% or more of paraphenylene groups, preferably 60 mol% or more, more preferably 70 mol% or more are heat resistant. ,
It is preferable in terms of physical properties such as moldability and mechanical properties.

As the arylene group (Ar) other than the paraphenylene group,
m-phenylene group o-phenylene group Substituted phenylene group [R: alkyl group (preferably C _{1 to} C ₆ alkyl group) or phenyl group, n: integer of 1 to 4], p, p′-diphenylene-
Sulfone group p, p'-biphenylene group p, p'-diphenylene ether group p, p'-diphenylenecarbonyl group Naphthalene group Etc. can be used.

From the viewpoint of processability of the composition, Copolymers containing heterogeneous repeat units may be preferred over homopolymers of repeat units alone. As a copolymer Is preferable, and those in which these repeating units are contained in a block form rather than in a random form (for example, those described in JP-A-61-14228) are preferable.
Compared to the random copolymer, when the block copolymer is used, it is almost the same in terms of processability, but is remarkably excellent in physical properties (heat resistance, mechanical properties, etc.). Because. In block copolymer The repeating unit is preferably 5 to 50 mol%, particularly preferably 10 to 25 mol%.

PATE as the component A used in the present invention preferably has a substantially linear structure from the viewpoint of the physical properties of the obtained molded product. Here, “PATE is a substantially linear structure” means not a polymer obtained by curing by oxidative crosslinking or thermal crosslinking, but a condensation polymerization of a monomer mainly containing a bifunctional monomer. The obtained polymer is said. However, within a range that does not substantially deteriorate the physical properties, for example, a polymerized crosslinked product obtained by using an effective amount of a crosslinking agent (for example, trihalobenzene) at the time of polymerization, or a polymer is subjected to high temperature curing treatment in the presence of O ₂ or the like. Thermally crosslinked products that have been crosslinked may also be acceptable.

Component A as the base polymer used in the composition of the present invention
Has a melt viscosity η ^* (temperature of 310 ° C., shear rate of 5 / sec) of 10 to 5
It is preferably in the range of x10 ⁴ poise, more preferably 50 to 5 x 10 ⁴ poise, still more preferably 100 to 5 x 10 ⁴ poise. When η ^* is less than 10 poise, the fluidity is too high and melt processing is difficult, and even if a molded product is obtained, mechanical strength and the like are poor, which is not preferable. Also, η ^*
Even if the value exceeds 5 × 10 ⁴ poise, the fluidity is poor and melt processing is difficult.

PATE satisfying the conditions of the present invention as described above is, for example,
It can be economically produced by the method described in JP-A-61-7332, which is related to the application of the present inventors.

That is, the method disclosed in JP-A-61-7332 is a method of obtaining a polyarylene sulfide by reacting an alkali metal sulfide with a dihaloaromatic compound in an organic amide solvent, and this reaction is carried out in at least the following two steps. It is characterized by what is done in.

(1) Reaction is carried out at a temperature of 180 to 235 ° C. in the presence of 0.5 to 2.4 mol of water per mol of alkali metal sulfide to convert polyarylene sulfide having a melt viscosity of 5 to 300 poise into a dihaloaromatic compound. A step of producing at a conversion of 50 to 98 mol%, (2) adding water so that 2.5 to 7.0 mol of water is present per mol of alkali metal sulfide and adding 245
A step of raising the temperature to ˜290 ° C. and continuing the above reaction.

In addition, a method of adding a large amount of a carboxylic acid described in JP-B-52-12240 to a polymerization system to obtain a high molecular weight linear PATE can be used.

Component B Component B as a burr property improver which is one of the essential compounding elements in the molding composition of the present invention has a chemical structure similar to that of Component A in the repeating unit Ar—S (—Ar— definition and A specific example is PATE whose main component is the above). Is a main constituent, although preferred, but not essential.

The characteristic difference between the component B and the component A is that the polymer B is
The η ^* (temperature 310 ℃, shear rate 5 / sec) is 5 × 10 ⁵ to 1 × 1
It is a cross-linked PATE that exhibits a gel state when melted at ⁹ poise, more preferably 1 × 10 ⁶ to 1 × 10 ⁹ poise [such an ultra-high viscosity PATE has a melt flow value (ASTM-D1238).
Method: 600 ° F, 5kg load), its melt viscosity is less than 1, making it difficult to express accurately.] η ^* is 5
If it is less than × 10 ⁵ poise, the effect of improving the burr characteristics cannot be obtained unless a large amount of it is added to the component A, so that the viscosity of the composition increases and the processability deteriorates, which is not preferable. On the other hand, η ^*
When it is more than 10 ⁹ poise, it becomes difficult to disperse it into a fine particle gel in the base polymer melt during the melt processing, and the effect of improving the burr characteristics becomes insufficient, which is also not preferable.

Uncrosslinked combs are non-gelled when melted with low crosslinking PATE
Is compatible with the component A even if the viscosity is high,
The effect of improving the burr characteristics is not preferable because the melt viscosity of the composition may be increased more than necessary while the effect of improving the burr characteristics is insufficient.

Examples of the method for producing the component B include a method of forming a crosslinked structure by using a crosslinking agent when polymerizing polyhalobenzene and an alkali metal sulfide, for example, a polyhaloaromatic having 3 or more halogen substituents. The compound is mixed in an amount of about 0.05 mol to about 20 mol with respect to 100 mol of the dihaloaromatic compound, and water and / or an alkali metal salt of a carboxylic acid is appropriately added to the mixture so that the melt viscosity is 5 × 10 ⁵ to 1 × 10 ⁹ poise. A method of reacting under a polymerization condition such that a crosslinked PATE that exhibits a gel state when melted is obtained, or a melt viscosity of 5 × 10 ^{5 at a} temperature of 200 ° C. or higher and a temperature lower than the melting point of PATE at a high temperature in the presence or absence of oxygen ~ 1 × 10 ⁹ poise, gel-like cross-linking when melted
A method for increasing the degree of crosslinking by performing a curing treatment for a time that causes PATE is used. In particular, the polymerized cross-linked PATE obtained by the former method is more preferable than the thermally cross-linked PATE obtained by the latter method in terms of color tone and thermal stability, and is therefore more preferable.

The blending amount of component B in the molding composition of the present invention is 0.2 to 90 parts by weight, more preferably 0.5 to 100 parts by weight of component A.
Appropriately in the range of -80 parts by weight, even more preferably 0.5-70 parts by weight and particularly preferably 0.5-60 parts by weight. If it is less than 0.2 parts by weight, the efficiency of improving the burr characteristics may be insufficient. On the other hand, if it exceeds 90 parts by weight, the fluidity of the composition may be significantly reduced, and the mechanical properties of the resulting molded article may be reduced, which is not preferable.

Filler In the molding composition of the present invention, a fibrous filler and / or an inorganic filler (component C) are preferred components which are not essential but are preferred. These are not essential in terms of improving the burr characteristics, but for the purpose of improving the physical properties of the molded product such as mechanical properties, heat resistance, electrical properties, chemical resistance, and reducing the cost as an extender, A filler is compounded.

The compounding amount is 400 parts by weight or less per 100 parts by weight of the component (A + B), and 0.01% is necessary for exhibiting the effect of the filler.
~ 400 parts by weight is preferred, more preferably 1 to 300
A suitable range is parts by weight, more preferably 10 to 250 parts by weight. If it exceeds 400 parts by weight, the fluidity of the composition is greatly lowered and the processability of the composition is significantly deteriorated, which is not preferable.

As the fibrous filler, glass, carbonaceous material, silicon carbide,
Examples thereof include fibers such as silica, alumina, zirconia, and aramid; whiskers such as potassium titanate, wollastonite, calcium sulfate, carbon, and boron.

As the inorganic filler, talc, mica, kaolin, clay, glass, magnesium carbonate, magnesium phosphate, calcium carbonate, calcium silicate, calcium sulfate, calcium phosphate, silicon oxide, aluminum oxide, titanium oxide, iron oxide (including ferrite) Powders such as copper oxide, dizirconia, zinc oxide, silicon carbide, carbon, graphite, boron nitride, molybdenum disulfide, and silicon.

Other Compounds In addition to the above-mentioned compounding elements, other synthetic resins, various elastomers, various processing additives and the like can be optionally compounded within a range not impairing the objects and effects of the present invention.

In this case, other synthetic resins include polyolefin, polyester (including aromatic polyester), polyamide (including aromatic polyamide), polyamideimide, polyimide, polyetherimide, polyethersulfone,
Examples thereof include polyether ketone, polyether ether ketone, polysulfone, polycarbonate, polyacetal, polyarylene, fluororesin, epoxy resin, silicone resin, phenol resin, polymethylmethacrylate, polystyrene and ABS.

Examples of the elastomer include fluorine rubber, silicon rubber, polyolefin rubber, hydrogenated SBR, isobutylene rubber, acrylic rubber, polyester elastomer, and polyamide elastomer.

Examples of the processing additive include an antioxidant, a stabilizer, a rust preventive, a lubricant, a release agent, a coupling agent, a colorant, a flame retardant, a foaming agent and an antistatic agent.

Production of the composition As the state of the molding composition of the PATE of the present invention, those in the solid powder mixture state of each compounding element and additive, and those in the coherent state in which the mixture undergoes the molten state are both included. However, the latter is a typical state and is usually manufactured as pellets or the like.

The former composition blends each compounding element and additive with a blender,
It can be produced by uniform mixing using a mixer, a mill or the like. The latter composition is produced by molding the former composition into pellets or the like by a melt-kneading method using an extruder or the like.

Use of the composition The use of the molding composition of the present invention is not limited to an injection-molded article, but the characteristics of the composition can be most utilized in an injection-molded article.

EFFECTS OF THE INVENTION The composition of the present invention is a molding composition having improved burr properties as compared with Component A alone, and is obtained by using an uncrosslinked substantially linear PATE as a base polymer. Further, the composition of the present invention using a conventional cross-linked PATE as a base polymer is an injection molding composition having excellent burr characteristics, which can be sufficiently used even in the field of precision molded articles, which had a problem with cross-linked PATE. .

Further, it goes without saying that the composition of the present invention has extremely excellent burr characteristics, but in addition to that, it has a high crystallization rate, excellent releasability, and thermal stability during melt processing. Is excellent, the mechanical properties, color tone, and dimensional stability of the obtained molded product are excellent, and the recycling property of molding waste is also excellent and the economy is good. By making full use of it, it can be widely used as a raw material for moldings in the fields of electronics and electronics, precision instruments, automobiles and aircraft.
Particularly, it is particularly suitable for the precision instrument field.

Further, in the present invention, the composition in which the component (B) is mixed in a slightly large amount is a composition having not only these effects but also improved weld characteristics during injection molding.

Hereinafter, the present invention will be specifically described using experimental examples and examples, but the present invention is not limited to these experimental examples and examples as long as the gist thereof is not exceeded.

Example Polymer Preparation Example A-1 1200 kg of N-methylpyrrolidone (NMP) and 420 kg of hydrous sodium sulfide (purity 46.4%) were charged into a Ti-clad autoclave, heated to about 202 ° C. and heated to distill 190 kg of water. . Then, 366 kg of p-dichlorobenzene was charged. 2
After conducting polymerization at 18 ° C for 5 hours, add 90 kg of water,
Polymerization was carried out at 260 ° C. for 1.5 hours and subsequently at 242 ° C. for 4 hours. A slurry containing the produced polymer was obtained. The slurry was sieved with a screen having an opening of 0.1 mm to separate only the granular polymer and washed with acetone and water to obtain a linear polymer.

This linear polymer was dipped in a 2% -NM ₄ Cl aqueous solution to 40 ° C /
It was treated for 30 minutes, washed with water, and dried under reduced pressure at 80 ° C. for 12 hours to obtain a polymer A-1 (granules). The melt viscosity η ^{* of the} obtained uncrosslinked polymer A-1 (value at temperature = 310 ° C., shear rate = 5 / sec., Η ^* in the present invention are all values under this condition) is 1 × 10 5. It was ⁴ poise.

Polymer Preparation Example A-2 NMP 15 kg and water-containing sodium sulfide (purity 46.4%) 4.20 kg S
Charged to US316 stainless steel autoclave, about 202 ℃
The temperature was raised to 1.6 to distill 1.6 kg of water. Then p-
Dichlorobenzene (3.65 kg) was charged and polymerization was carried out at 240 ° C for 2 hours.

Heating the slurry containing the produced polymer under reduced pressure,
NMP was distilled off. The solid containing the obtained polymer was washed with water to remove salts, washed with acetone and washed with water, and dried under reduced pressure at 80 ° C. for 1 hour. Η of the obtained polymer (powder)
^* Was 100 poise.

About this polymer 270 ℃ / 6 in an air circulation oven
Polymer A-2 after high temperature curing for an hour
(Powder) was obtained. The η ^* of the resulting heat-crosslinkable polymer A-2 was 1 × 10 ⁴ poise.

Polymer Preparation Example B-1 NMP 2.0 kg and hydrous sodium sulfide (purity 46.4%) 420 g were charged into an autoclave and heated to about 200 ° C.
Distilled 0g. Then, 355 g of p-dichlorobenzene and 11 g of 1,2,4,5-tetrachlorobenzene were charged. twenty one
After polymerizing at 5 ℃ for 8 hours, add 30g of water to about 30
Heat up to 250 ° C in minutes and heat for 250 ° C / 0.3 hours, then 21
The mixture was cooled to 0 ° C. in 15 minutes, heated again to 245 ° C. in 30 minutes, and kept for 12 hours. Polymer B that exhibits gel when melted
-1 (about 20% granules and about 80% lumps) was obtained. The η ^* of the obtained cross-linked polymer B-1 was about 1 × 10 ⁷ poise. Separately, the polymer which was cooled as it was without raising the temperature to 245 ° C. was fine powder and had η ^* <10 poise.

Polymer Preparation Example B-2 Polymer B-2 showing a gel state when melted was prepared by the same method as Polymer Preparation Example B1 except that the amount of 1,2,4,5-tetrachlorobenzene charged was 5.5 g. Obtained. The obtained polymerized and crosslinked polymer B-2 had η ^* of 3 × 10 ⁶ poise.

Polymer Preparation Example B-3 Polymer B-3 was obtained by the same method as Polymer Preparation Example B1 except that the charged amount of 1,2,4,5-tetrachlorobenzene was changed to 0.55 g. It was The η ^* value of the obtained polymerized crosslinked polymer B-3 was about 5 × 10 ⁴ poise.

Polymer Preparation Examples B-4 to B-6 About a part of the polymer A-1 obtained in the above-mentioned polymer preparation example A, 280 ° C./16 in an air circulation oven, respectively.
Polymers B-4, B-5 and B-6 were prepared by high temperature curing at 280 ° C / 6 hours and 270 ° C / 5 hours. The resulting heat-crosslinkable polymers B-4 and B-5
And η ^{* of} B-6 are about 5 × 10 ⁶ poise and about 1 respectively.
It was x10 ⁶ poise and about 5 x 10 ⁴ poise. Polymer B
-4 and B-5 were gel-like when melted.

Were charged polymer Preparation Example A-3 a polymerization vessel during NMP 930 kg and Na ₂ S · 5H ₂ O (containing 46.07 wt% as Na ₂ S) 423kg, water 171kg distillate was gradually heated to 203 ° C. I let it go. 5 kg of water and 44 kg of NMP were added, followed by 365 kg of paradichlorobenzene. 220 ° C
After polymerizing for 5 hours, add 135 kg of water and add 4.5 at 255 ℃.
Polymerized for hours. After cooling, the reaction liquid was sieved with a screen having an opening of 0.1 mm to recover a granular polymer, which was washed with methanol and water to obtain a linear polymer. This polymer was immersed in a 2% aqueous NH ₄ Cl solution and treated at 40 ° C. for 30 minutes while stirring. The polymer was washed with water and then dried to obtain polymer A-
Got 3. The η ^* value of the obtained linear polyphenylene sulfide (A-3) was 880 poise.

Preparation Example of Composition Preparation of Composition Polymers A-1 and A-3 were used as base polymers of the uncrosslinked cleaning polymer. Polymer A-2 was used as a model for the base polymer used in conventional heat-crosslinking injection molding compositions. Polymers B-1 to B-6 were used as flash improvers.

As a premix, a predetermined amount of various burr property improving polymers and glass fibers (abbreviated as GF, diameter 13 μm, 3 mm length, manufactured by Nippon Electric Glass Co., Ltd.) were blended per 100 parts by weight of the base polymer to obtain powdered compositions. Prepared.

In this pre-mixing procedure, PATE and the burr improving polymer were first mixed in a Henschel mixer, and then glass fibers were added to this mixture and mixed in a tumbler mixer. This powdery composition is melt-kneaded using a bidirectional kneading extruder of the same direction (cylinder diameter 30 mmφ, # BT-30 manufactured by Plastic Engineering Laboratory), extruded into a strand, and rapidly cooled,
Each pelletized composition was prepared by cutting.

Injection molding example An injection molding machine (# IS-25EV manufactured by Toshiba Machine Co., Ltd.) was equipped with a mold for burr characteristics test (30 μm for burr formation, with a gap), and the resin temperature of each pellet sample was 350 to 360 ° C. Injection molding was performed at a mold temperature of 145 ° C. Experiment numbers 1 to 12 had an injection molding holding pressure of 1400 kg / cm ² , and experiment numbers 13 to 18 had an injection molding holding pressure of 1000 kg / cm ² .

The mold used for the burr characteristics test was 2mm x 40mm x 40m.
It has a cavity of m, and the width is 2mm at the center of one side of this square.
In the case where the gate part is provided, four burrs forming gaps (width of 4 mm × length (injection direction) 6 mm (clearance 30 μm as described above) on the side facing the gate part are formed as a set of intervals of 2 mm and the injection axis is formed. It is provided 10 mm apart from the center.

The shorter the length of burrs generated at intervals of 30 μm in the obtained molded product, the better the burr characteristics. The evaluation was made such that the one having extremely poor burr characteristics was 1, the one having extremely excellent burr characteristics was 5, and the level of the conventional composition was 3. The results are collectively shown in Tables 1 and 2. Similarly, several compositions were subjected to a physical property test after injection molding was performed at a mold temperature of 145 ° C. using a physical property test piece mold.

Evaluation of physical properties A mold for physical property test pieces was mounted on an injection molding machine, and each sample was injection-molded under the conditions of a resin temperature of 350 to 360 ° C, a mold temperature of 145 ° C, and an injection molding holding pressure of 1000 kg / cm ² .

The mechanical properties were measured according to ASTM.

The results are shown in Table 2.

Weld tensile strength Tensile test pieces of the above-mentioned mold for physical property test are provided with gates at both ends, and when a weld characteristic test piece is made, a resin is put in from both gates at the time of injection molding at the time of injection molding Created a piece. When a normal tensile test piece was prepared, the gate on one side was crushed and injection molded. Tensile strength and elongation were measured using each test piece.

Measurement of crystallinity The crystallinity is 2θ = 17 to 23 ° from the wide-angle X-ray diffraction pattern.
The crystalline scattering intensity Ac at and the amorphous scattering intensity Aa are separated,
The value calculated from the formula Ci = [Ac / (Ac + Aa)] × 100 is used. For more information on this point, see "J.Applled Polymer Science".
Sci.) 20 , 2541 (1976).

Measurement of Melt Viscosity Using a Koka type flow tester, measurement was performed at 310 ° C. and a shear rate of 5 / sec.

From Table 2, it was found that the composition of the present invention not only has the effect of suppressing burrs but also promotes crystallization during molding, and surprisingly also has improved weld characteristics.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Susumu Kawakami 25-13 Ueda-machi Nekoya, Iwaki, Fukushima Prefecture (72) (72) Inventor Zenya Shiiki 28-1, Nishikimachi, Iwaki, Fukushima Prefecture (56) References 61-87752 (JP, A) JP 62-81450 (JP, A) JP 63-225656 (JP, A) JP 2-255767 (JP, A) JP 2-180962 (JP, A) JP-A-2-151656 (JP, A) JP-A-2-107666 (JP, A) JP-A-62-240359 (JP, A) JP-A-1-124579 (JP, A)

Claims (6)

[Claims] 1. To 100 parts by weight of the following component A, 0.1 part of the following component B is added.
A polyarylene thioether molding composition having improved burr properties, which comprises 2 to 90 parts by weight and 0 to 400 parts by weight of the following component C per 100 parts by weight of component (A + B). Component A: Repeating unit Melt viscosity (temperature 310 ° C, shear rate 5 /
A resin consisting of polyarylene thioether with a sec) of 10 to 5 × 10 ⁴ poise. Component B: Melt viscosity (temperature 310 ° C, shear rate 5 / sec) is 5 x 10 ^5.
A cross-linked polyarylene thioether which exhibits a gel state when melted at 1 × 10 ⁹ poise. Component C: Fibrous filler, inorganic filler or a mixture of both. 2. The molding composition according to claim 1, wherein the component A is a resin composed of an uncrosslinked substantially linear polyarylene thioether. 3. The molding composition according to claim 1, wherein the component B is a cross-linked polyarylene thioether which exhibits a gel state when melted by polymerization cross-linking. 4. The molding composition according to claim 1, wherein the component B is a crosslinked polyarylene thioether which exhibits a gel state when melted by high temperature curing. 5. The molding composition according to claim 1, which contains the component C in an amount of 0.01 to 400 parts by weight based on 100 parts by weight of the component (A + B). 6. The molding composition according to claim 1, which is an injection molding composition.