JP2002121398A - Thermoplastic resin composition for hot plate welding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve an external appearance of a molded article and working properties by solving the problem of stringing phenomenon in hot plate welding, and to provide a thermoplastic resin composition for hot plate welding having good impact strength, heat resistance, and flowability, and a molded article having an excellent external appearance. SOLUTION: The thermoplastic resin composition for hot plate welding is obtained by adding a specified amount of an inorganic filler and a specified trace amount of a fluororesin to a thermoplastic resin to be used in hot plate welding. The molded article is composed of this composition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermoplastic resin composition having an excellent balance of impact strength, heat resistance, and fluidity, and more particularly, to a joining portion formed by heating a molded product of the thermoplastic resin composition with a heated plate. After melting, they are joined by pressure welding to form a thermoplastic resin composition for hot plate welding, which is a raw material of a molded product suitable for so-called hot plate welding, and heat the molded product and the same resin or another resin molded product. It relates to a molded product joined by plate welding.

[0002]

2. Description of the Related Art Conventionally, hot plate welding has been used for joining resin molded products. Hot plate welding means, for example, when joining a housing and a lens of a winker made of a resin molded product, which is a lighting device for a vehicle, after melting each joint separately with a hot plate and immediately joining these joints. Are joined by pressing and welding. However, in this hot plate welding, when the resin molded product is separated from the hot plate, a so-called stringing phenomenon occurs in which the resin is stretched in a thread shape, which remains on the surface of the molded product, resulting in poor appearance and markedly reduced workability. I will. In order to improve the stringing phenomenon, it is conceivable to add a small amount of a fluororesin such as polytetrafluoroethylene, but in this case, the extrudability becomes unstable due to surging at the time of extrusion and kneading, There was a problem that a molding failure phenomenon such as silver occurred in the molded product (Japanese Patent Laid-Open No. 09-12 / 09).
No. 902).

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to solve such a stringing phenomenon that occurs during welding of a hot plate, and to improve poor appearance of a molded article and decrease in workability. Stringing during welding has been improved, and the impact strength and
An object of the present invention is to provide a thermoplastic resin composition for hot plate welding having good heat resistance and fluidity and a molded article having excellent appearance.

[0004]

Means for Solving the Problems The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, added a specific amount of an inorganic filler and a specific trace amount of a fluororesin to a resin composition used for hot plate welding. By doing so, stringing during hot plate welding is dramatically improved, and impact strength, heat resistance, and a thermoplastic resin composition suitable for hot plate welding with good fluidity and a molded article with excellent appearance are provided. I found it. In the present invention, (A) the thermoplastic resin preferably contains a rubber-containing resin, more preferably,
It is a mixture of a rubber-containing resin and a maleimide resin, or a rubber-containing resin and a polycarbonate resin. Also,
(B) The inorganic filler is preferably calcium carbonate, and the specific surface area of the calcium carbonate is more preferably 1.2 μm or less. Further, (C) the fluororesin is preferably polytetrafluoroethylene.

[0005] The thermoplastic resin (A) in the thermoplastic resin composition for hot plate welding of the present invention is not particularly limited, and rubber-containing resin, maleimide resin, SAN resin, polycarbonate resin, nylon-6, Nylon-66, nylon-610, nylon-612, nylon-11,
Nylon-12, polyamide resin such as nylon 46, polybutylene terephthalate, saturated polyester resin such as polyethylene terephthalate, wholly aromatic polyester resin such as polyarylate, polyphenylene oxide resin, polyphenylene sulfide resin, polysulfone resin, polyether sulfone resin, Examples thereof include polyolefin resins such as polyethylene and polypropylene, and these can be used alone or in combination of two or more.

When two or more kinds of thermoplastic resins are mixed and used in the thermoplastic resin composition for hot plate welding of the present invention, the ratio is not particularly limited, and is appropriately determined according to required characteristics and the like. When at least one kind of rubber-containing resin is used as the thermoplastic resin, the content of the rubber-containing resin in the thermoplastic resin composition for hot plate welding is 10 to 90% by weight, and the content of the other thermoplastic resin is 7 to 86% by weight. Preferably, there is. If the ratio of the rubber-containing resin is less than 10% by weight, the impact strength is low,
If it exceeds 0% by weight, the heat resistance becomes extremely low.

[0007] The rubber-containing resin is a copolymer obtained by graft-polymerizing an aromatic vinyl monomer alone or a vinyl monomer copolymerizable therewith with a rubber-like polymer. Further, these may contain a polymer of the above-mentioned aromatic vinyl monomer alone or a vinyl monomer copolymerizable therewith. Specific examples of the rubbery polymer include a butadiene polymer, a copolymer of a vinyl monomer copolymerizable with butadiene, an ethylene-propylene copolymer, an ethylene-propylene-diene copolymer, and a mixture of butadiene and an aromatic polymer. A block copolymer with vinyl, an acrylate polymer, a copolymer of an acrylate ester with a vinyl monomer copolymerizable therewith, and the like are used.

[0008] Styrene, α
Styrene monomers such as -methylstyrene, vinyltoluene, t-butylstyrene, chlorostyrene and the like and substituted products thereof are exemplified, and among these, styrene is particularly preferred. Vinyl monomers copolymerizable with the above monomers include acrylonitrile, methacrylonitrile, vinyl cyanide monomers such as α-chloroacrylonitrile, methyl acrylate, ethyl acrylate, butyl acrylate Acrylate monomers such as methacrylate esters such as methyl methacrylate and ethyl methacrylate, acrylic acid, vinyl carboxylic acid monomers such as methacrylic acid, acrylamide and methacrylamide. No.

The method for producing the rubber-containing resin is not particularly limited. For example, a monomer mixture comprising an aromatic vinyl monomer and a vinyl monomer copolymerizable therewith is graft-polymerized to a rubber-like polymer. It can be manufactured by the following. Specifically, those obtained by any of the conventionally known emulsion polymerization method, suspension polymerization method, bulk polymerization method, solution polymerization method and the like may be used, or these polymerization methods may be used. Combination technology may be used.

[0010] When the thermoplastic resin in the thermoplastic resin composition for hot plate welding of the present invention is a mixture of at least one or more rubber-containing resins and a maleimide resin, the thermoplastic resin composition for hot plate welding is preferably used. Is preferably used in a proportion of 5 to 75% by weight, more preferably 1 to 75% by weight.
It is 0 to 60% by weight, more preferably 10 to 40% by weight. Maleimide resin is an aromatic vinyl monomer 25
~ 70 wt%, unsaturated dicarboxylic imide derivative 25 ~
75% by weight, unsaturated dicarboxylic anhydride monomer 0 to 25
%, And preferably 0 to 40% by weight of a vinyl monomer copolymerizable with these monomers. The aromatic vinyl monomer in the maleimide resin includes styrene, α-methylstyrene, vinyltoluene and t-
Examples thereof include styrene monomers such as butylstyrene and chlorostyrene and substituted products thereof, and among them, styrene is particularly preferred.

Examples of the unsaturated dicarboxylic acid imide derivative include maleimide monomers such as maleimide, N-methylmaleimide, N-ethylmaleimide, N-cyclohexylmaleimide, N-phenylmaleimide and N-naphthylmaleimide. Among them, N-phenylmaleimide is particularly preferred. Examples of the unsaturated dicarboxylic acid anhydride monomer include anhydrides such as maleic acid, itaconic acid, citraconic acid, and aconitic acid, and maleic anhydride is particularly preferable. As the vinyl monomer copolymerizable with the above monomers, acrylonitrile, methacrylonitrile, vinyl cyanide monomers such as α-chloroacrylonitrile, methyl acrylate, ethyl acrylate, Acrylate monomers such as butyl acrylate, methacrylate monomers such as methyl methacrylate and ethyl methacrylate, vinyl carboxylic acid monomers such as acrylic acid and methacrylic acid, acrylamide and methacryl Acid amide and the like.

The method for producing the maleimide resin includes an aromatic vinyl monomer, an unsaturated dicarboxylic acid imide derivative, an unsaturated dicarboxylic anhydride monomer used as required, and a copolymerizable with these monomers. The vinyl monomer may be directly copolymerized by a known method, or an unsaturated dicarboxylic anhydride monomer may be an aromatic vinyl monomer, and a vinyl monomer copolymerizable with these monomers. After copolymerization, it may be reacted with ammonia and / or a primary amine to obtain an unsaturated dicarboxylic acid imide derivative. However, as a method for producing these copolymers, the latter, that is, an unsaturated dicarboxylic anhydride monomer was copolymerized with an aromatic vinyl monomer, and a vinyl monomer copolymerizable with these monomers The method of imidization later is more preferable in terms of copolymerizability and economy. The primary amine used in the imidation reaction is methylamine, ethylamine, propylamine, butylamine, hexylamine, cyclohexylamine, decylamine, aniline, toluidine, naphthylamine, chlorophenylamine, dichlorophenylamine, bromophenylamine, dibromophenyl. Amines and the like.

[0013] The imidization reaction can be carried out in a solution state, bulk state or suspension state using an autoclave. It is also possible to carry out the reaction in a molten state using a melt kneading device such as a screw extruder. The solvent used for the solution reaction in imidation is arbitrary,
For example, ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone, ethers such as tetrahydrofuran and 1,4-dioxane, aromatic hydrocarbons such as toluene and xylene, dimethylformamide, dimethyl sulfoxide, and N-methyl-2- Examples include pyrrolidone and the like. The reaction temperature for imidization is 50 to 35
A range of 0 ° C is preferred, and a range of 100 to 300 ° C is particularly preferred. The imidization reaction does not necessarily require the presence of a catalyst, but if used, tertiary amines such as trimethylamine, triethylamine, tributylamine, N, N-dimethylaniline, and N, N-diethylaniline are preferred. The maleimide resin may be obtained by any of the conventionally known emulsion polymerization method, suspension polymerization method, bulk polymerization method, solution polymerization method, or a combination of these polymerization methods. Although a technique based on a simplified technique may be used, a technique based on a solution polymerization method is preferable. Further, any of batch polymerization and continuous polymerization may be used.

When the thermoplastic resin in the thermoplastic resin composition for hot plate welding of the present invention is a mixture of at least one kind of rubber-containing resin and a polycarbonate resin, the thermoplastic resin composition for hot plate welding is preferably used. The polycarbonate resin is preferably used in a ratio of 10 to 85% by weight,
It is more preferably 20 to 80% by weight, and further preferably 30 to 70% by weight. Examples of the polycarbonate resin include aromatic, aliphatic, and combined aromatic / aliphatic resins obtained by a phosgene method, a transesterification method, or the like. There is also a modified polycarbonate resin such as a hetero bond copolymer having a carbonate bond and another bond such as an ester bond, a urethane bond or a siloxane bond in the main chain.

The content of the inorganic filler (B) used in the thermoplastic resin composition for hot plate welding of the present invention is 3 to 18% by weight. (B) When the content of the inorganic filler is less than 3% by weight, the effect of improving the stringing at the time of hot plate welding is reduced, and when it exceeds 18% by weight, the fluidity is reduced and the moldability is deteriorated. As the inorganic filler (B) used in the thermoplastic resin composition for hot plate welding of the present invention, talc, silica, clay, mica,
Examples include calcium carbonate, titanium oxide, magnesium oxide, magnesium hydroxide, aluminum hydroxide, potassium titanate, calcium silicate, barium sulfate, and the like. Calcium carbonate is particularly preferred, and the specific surface area diameter is 1.2 μm.
m is more preferable. The specific surface area diameter is a particle diameter represented by the following formula-1. Specific surface area diameter = 6 / (specific gravity × specific surface area) Formula-1 Here, the measuring method of the specific surface area used the apparatus and principle shown below. Apparatus: Specific surface area measuring apparatus SS-100 (manufactured by Shimadzu Corporation) Principle: Kozeny-Carman type

(Equation 1) Sw: specific surface area of the object cm ² / g ε: porosity of the sample packed layer −ρ: density of powder g / cm ³ η: viscosity coefficient of fluid g / cm · sec L: thickness of sample layer cm Q: Amount of fluid passing through the sample layer ml ΔP: pressure difference between both ends of the sample layer g / cm ² A: cross-sectional area of the sample layer cm ² t: time required for passage of Qml fluid secW: weight of sample

The content of the fluorine resin (C) used in the thermoplastic resin composition for hot plate welding of the present invention is 0.01 to 0.4.
% By weight. (C) When the content of the fluororesin is less than 0.01% by weight, the effect of the addition cannot be obtained, and when it exceeds 0.4% by weight, the extrudability becomes unstable due to surging at the time of extrusion kneading, A molding failure phenomenon such as silver occurs in the molded product. The (C) fluororesin used in the thermoplastic resin composition for hot plate welding of the present invention includes polytetrafluoroethylene, polychlorotrifluoroethylene, tetrafluoroethylene, tetrafluoroethylene / ethylene copolymer, and polyvinylidene. Resins containing a fluorine atom in the molecule such as fluoride, polyvinyl fluoride, tetrafluoroethylene / hexafluoropropylene copolymer, tetrafluoroethylene / perfluoroalkylvinyl ether copolymer, and the like, and polytetrafluoroethylene, tetrafluoro Ethylene / perfluoroalkyl vinyl ether copolymer and tetrafluoroethylene / hexafluoropropylene copolymer are preferred, and polytetrafluoroethylene is particularly preferred.

If only the component (A) of the present invention is a thermoplastic resin, a so-called stringing phenomenon occurs in which the resin is stretched into a thread when the resin molded product is separated from the hot plate during hot plate welding. It remains on the surface of the molded article, causing poor appearance and remarkable reduction in workability. However, by adding the component (B), the inorganic filler, the component (C), and the fluororesin in specific ratios, this stringing phenomenon is remarkably improved, and poor appearance of the molded product and reduction in workability are obtained. It is possible to obtain a thermoplastic resin composition for hot plate welding which can be improved and has good moldability. For example, by adding the component (B) and the inorganic filler alone, the stringing phenomenon can be improved, but the fluidity decreases and the moldability deteriorates. Although the stringing phenomenon can be improved by adding the component (C) or the fluororesin alone, the extrudability becomes unstable due to surging at the time of extrusion kneading or molding of silver or the like into a molded product. Failure phenomena occur.

In the present invention, the mixing of the thermoplastic resin (A), the inorganic filler (B) and the fluorocarbon resin (C) can be carried out by using a usual melt kneading apparatus. Examples thereof include a screw extruder, a Banbury mixer, a kneader, and a mixing roll. The thermoplastic resin composition for hot plate welding of the present invention can be made into a composition by adding other additives or modifiers depending on the application. Specifically, stabilizers, flame retardants, plasticizers, lubricants, ultraviolet absorbers, colorants, and the like can be used. The molded article of the thermoplastic resin composition for hot plate welding of the present invention can be suitably used for a vehicle lighting device such as a blinker, a rear combination lamp, or a headlamp, but is not limited thereto. .

Hereinafter, the present invention will be described in more detail with reference to examples. All percentages used in Examples and Comparative Examples are based on weight. These are all examples and do not limit the content of the present invention. 1. Raw material resin (A) Thermoplastic resin

Reference Example 1 Components of rubber-containing resin (a-1 to a-3) (a-1 and a-2) Graft copolymer Polybutadiene latex 8.12 kg (solid content 50% by weight, average particle size 0.35 μm) ), Sodium stearate 1
00g, sodium formaldehyde sulfoxylate 1
0 g, 3 g of tetrasodium ethylenediamine tetraacetylic acid, 0.3 g of ferrous sulfate and 20 kg of water were heated to 65 ° C., and a monomer mixture comprising 69.4% by weight of styrene and 30.6% by weight of acrylonitrile was added thereto. 5.
94 kg, t-dodecyl mercaptan 30 g, cumene hydroperoxide 20 g were continuously added in 4 hours,
After the addition was completed, the mixture was polymerized at 65 ° C. for 2 hours (polymerization ratio: 96
%). After adding an antioxidant to the obtained latex,
After coagulation with calcium chloride, washing with water and drying, a white powdery graft copolymer (a-1) was obtained. 11.96 kg of polybutadiene latex, a monomer mixture 4.0 containing 70.2% by weight of styrene and 29.8% by weight of acrylonitrile
Graft polymerization was performed in the same manner as in the case of a-1 except that 2 kg was used, to obtain a graft copolymer (a-2). Table 1 shows the charged composition and final composition of each of the above graft copolymers.

[0020]

Reference Example 2 (a-3) Copolymer Styrene 7.02 kg, acrylonitrile 2.98 k
g, 250 g of tribasic calcium phosphate, 50 g of t-dodecyl mercaptan, 20 g of benzoyl peroxide and 25 kg of water were heated to 70 ° C. to initiate polymerization. Seven hours after the start of the polymerization, the temperature was raised to 75 ° C. and maintained for 3 hours to complete the polymerization (polymerization rate: 97%). The obtained reaction solution was neutralized with hydrochloric acid, and after dehydration and drying, a white bead-like copolymer (a-3) was obtained. Table 1 shows the charged composition and final composition of each of the above copolymers.

[0021]

Reference Example 3 (a-4 and a-5) Maleimide resin Methyl ethyl ketone in an autoclave equipped with a stirrer 9.
0 kg, 6.25 kg of styrene, and 10 g of α-methylstyrene dimer were charged, and the inside of the system was replaced with nitrogen gas, and then heated to a temperature of 80 ° C. In addition, 3.75 maleic anhydride
A solution of 30 g of benzoyl peroxide in 6.0 kg of methyl ethyl ketone was added over 10 hours. The temperature was kept at 80 ° C. for a further 2 hours after the addition. A part of the reaction solution was sampled, and the amount of unreacted monomer was quantified by gas chromatography, and the polymerization rate and the content of maleic anhydride in the polymer were calculated. Table 1 shows the results.
15.0 kg of methyl ethyl ketone was added to the remaining reaction solution, and the mixture was cooled to room temperature. This was poured into 80.0 kg of methanol with vigorous stirring, filtered and dried to obtain a white powdery polymer. 3.0 kg of this polymer, triethylamine 3
0 g of methyl ethyl ketone 7.0 k in an autoclave.
g, and aniline (1.20 kg) was added thereto.
The imidation reaction was performed at 7 ° C. for 7 hours. The reaction solution was cooled to room temperature, poured into 30.0 kg of vigorously stirred methanol, filtered and dried to obtain a maleimide resin (a-4). Other maleimide resins (a-5) were also prepared with the charge compositions shown in Table 2 under substantially the same conditions. 13C-NMR
NPMI of maleic anhydride group by (nuclear magnetic resonance) method
The conversion to the (N-phenylmaleimide) group was determined. The final composition ratio was calculated from these and is shown in Table 2.

(A-6) Polycarbonate resin a-6: A commercially available polycarbonate resin, Panlite L-1250 (Teijin Kasei) was used.

(B) Inorganic filler b-1: generally commercially available calcium carbonate, NS
# 2500 (Nitto Powder Chemical Industry, specific surface area 0.89μm)
Was used. b-2: Calcium carbonate, NS which is generally commercially available
# 400 (Nitto Powder Chemical Industry, specific surface area diameter 1.71 μm) was used. b-3: generally commercially available calcium silicate, FPW
# 5000 (Kinsei Kogyo) was used. b-4: A commercially available magnesium hydroxide, Kisuma 5B (Kyowa Chemical Industry) was used.

(C) Fluororesin c-1: A commercially available tetrafluoroethylene resin, Teflon 6CJ (Dupont Mitsui Fluorochemicals) was used.

[0025]

[Table 1]

[0026]

[Table 2]

2. Evaluation method (1) Evaluation of stringiness: injection molding machine (Kawaguchi Iron Works, K-1
According to 25-I), a square plate having a width of 100 mm, a length of 355 mm, and a thickness of 2 mm was formed at a forming temperature of 260 ° C.
It was cut into a size of 00 × 60 × 2 mm. Stringing is
A 60 × 2 mm surface of the test piece was pressed against an iron plate heated to a temperature of 300 ° C., and 1.5 mm of the test piece was melted on the iron plate as a sinking margin. After 20 seconds, the test piece was heated at a speed of 500 mm / sec. Was pulled up, the state of stringing was visually inspected, and evaluated as follows. ：: No stringing was observed at all, or some stringing was observed, but the appearance was not impaired, and the maximum value of stringing was 10 mm or less. X: Clear stringing was observed, the appearance was impaired, and the maximum stringing value exceeded 10 mm.

(2) Fluidity: Injection molding machine (Toshiba Machine, I
S-30EPN) and a spiral flow (2 mm
Was measured at a molding temperature of 260 ° C., a mold temperature of 60 ° C., and an absolute injection pressure of 69 MPa.

(3) Impact strength: According to ASTM D-256, a notched Izod impact strength of a 6.4 mm thick injection molded article molded at a molding temperature of 250 ° C. was measured. The ambient temperature is 23 ° C.

(4) Heat resistance: According to JIS K-7206, a Vicat softening point (49N load) was measured using a 3.2 mm thick injection molded product molded at a molding temperature of 250 ° C.

(5) Evaluation of extrusion stability: The stability during extrusion kneading was evaluated as follows in the process of extruding and pelletizing with a TEM35B extruder described below. ：: There is almost no surging and the extrudability is good. ×: Surging is severe and extrusion is difficult.

[0032]

Examples 1 to 9 (A) thermoplastic resin, (B) so that the total amount is 8 kg at the mixing ratio (% by weight) shown in Table 3.
The inorganic filler and the fluorocarbon resin (C) were charged into a 20-liter Henschel, blended, and extruded at 280 ° C. into a pellet using a TEM35B extruder (Toshiba, same direction in two axes). Using the pellets, test pieces were prepared by an injection molding machine, and the impact strength and heat deformation temperature were measured, and stringing was evaluated. The fluidity was also measured. Table 3 shows the results
Shown in

[0033]

Comparative Examples 1 to 6 (A) thermoplastic resin and (B) inorganic filler, or (A) thermoplastic resin and (A) so that the total amount is 8 kg at the blending ratio (% by weight) shown in Table 4. C) Fluorine resin is charged into a 20-liter Henschel and blended, and then a TEM35B extruder (Toshiba, two-axis same direction)
At 280 ° C. for pelletization. Using the pellets, test pieces were prepared by an injection molding machine, and the impact strength and heat deformation temperature were measured, and stringing was evaluated. The fluidity was also measured. The results are shown in Table 4.

[0034]

[Table 3]

[0035]

[Table 4]

In each of Comparative Examples 1 to 6, the contents of (A) a thermoplastic resin, (B) an inorganic filler, and (C) a fluorine resin are out of ranges. From the results of the examples and the comparative examples, it is found that the content of the thermoplastic resin (A) is less than 82% by weight,
If the content of the inorganic filler exceeds 18% by weight, the fluidity will be low and the moldability will be poor. Further, (A) the content of the thermoplastic resin exceeds 96.9% by weight, (B) the content of the inorganic filler is less than 3% by weight, or (C) the content of the fluororesin is 0.1% by weight. If it is less than 01% by weight, the effect of improving stringing at the time of hot plate welding is low. Further, when the content of (C) the fluororesin exceeds 0.4% by weight, the extrusion stability is low,
The appearance of the molded article also deteriorates.

As described above, the thermoplastic resin composition contains (A) 82 to 96.9% by weight of the thermoplastic resin, (B) 3 to 18% by weight of the inorganic filler, and (C) 0.01 to 18% by weight of the fluororesin.
Only when the content is 0.4% by weight, stringing is improved, good hot plate welding can be performed, the appearance of molded products is high, impact strength is good, heat resistance is excellent, moldability is good. It can be seen that the stability during extrusion kneading is increased.

[0038]

The thermoplastic resin composition for hot plate welding according to the present invention has extremely improved stringing as compared with conventional resins, and has high appearance and impact strength of molded articles. Good, excellent in heat resistance, good in moldability, high in stability during extrusion kneading, and useful as hot plate welding.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08L 69/00 C08L 69/00 79/04 79/04 Z // (C08L 101/00 (C08L 101/00) 27:12) 27:12) B29L 11:00 B29L 11:00 F term (reference) 4F211 AA16 AB11 AB16 AD05 AH73 TA01 TC08 TC14 TD07 TN07 TQ01 4J002 AA011 AC031 AC081 BB031 BB121 BB151 BD122 BD142 BD152 BD162 BG041 BP01 CF011 CH071 CL011 CL031 CM021 CN031 DE076 DE136 DE146 DE186 DE236 DG046 DJ006 DJ016 DJ036 DJ046 DJ056 FD016 GN00

Claims (9)

[Claims] 1. An active ingredient comprising (A) 82 to 96.9% by weight of a thermoplastic resin, (B) 3 to 18% by weight of an inorganic filler, and (C) 0.01 to 0.4% by weight of a fluororesin. The test piece molded from this was pressed against an iron plate heated to a temperature of 300 ° C.
1.5mm of the test piece was melted on the iron plate as sinking allowance,
A thermoplastic resin composition for hot plate welding, wherein a maximum length of stringing when the test piece is pulled up at a speed of 500 mm / sec after 20 seconds is 10 mm or less. 2. The thermoplastic resin composition for hot plate welding according to claim 1, wherein the thermoplastic resin (A) contains a rubber-containing resin. 3. The thermoplastic resin composition for hot plate welding according to claim 1, wherein the thermoplastic resin (A) is a mixture of a rubber-containing resin and a maleimide resin. 4. The thermoplastic resin composition for hot plate welding according to claim 1, wherein the thermoplastic resin (A) is a mixture of a rubber-containing resin and a polycarbonate resin. 5. The inorganic filler has a specific surface area diameter of 1.2 μm.
m or less, and the thermoplastic resin composition for hot plate welding according to any one of claims 1 to 4. 6. The thermoplastic resin composition for hot plate welding according to claim 1, wherein the inorganic filler (B) is calcium carbonate. 7. The inorganic filler has a specific surface area diameter of 1.2 μm.
5. The thermoplastic resin composition for hot plate welding according to claim 1, wherein the composition is calcium carbonate of m or less. 8. The thermoplastic resin composition for hot plate welding according to claim 1, wherein the fluorocarbon resin (C) is polytetrafluoroethylene. 9. A molded article comprising a molded article made of the thermoplastic resin composition for hot plate welding according to claim 1 and a resin molded article joined by hot plate welding.