JPH11138642A - Resin frame assembly and assembling method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin frame assembly that can be used under strict environments having no breakage and deformation due to impact such as dropping or the like or cold heat cycle. SOLUTION: A thermoplastic resin composition is used which consists of a 3-30 wt.% graft polymer obtained by graft-copolymerizing one or more vinyl monomers selected from the group consisting of an aromatic vinyl monomer, a vinyl monomer cyanide, and a methacryl acid ester to 20-87 wt.% polycarbonate resin (A), 10-60 wt.% thermoplastic polyester resin (B), and a rubber polymer (C) for obtaining a molded item having the resin frame and functional part of a molded item with a thermoplastic resin composition, and further a resin frame assembly is made by a method of joining the resin frame and resin part of the molded item through insert molding by a heat welding method.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin frame assembly which can be used without being damaged or deformed by an impact such as a drop or a thermal cycle and can be used without being damaged or deformed even in a severe environment, and a method of assembling the same.

[0002]

2. Description of the Related Art A frame is a skeleton in an assembly,
This is a part whose main purpose is to maintain the product shape. In the assembled product, various other functional components are joined together around a frame, and are designed so that various performances can be maintained in a use environment after the assembly. Therefore, the frame is required to have sufficient strength, rigidity, heat resistance, etc. in a state in which various functional components are securely fixed, and therefore a metal material is often used from the viewpoint of high safety.

On the other hand, in electric, electronic and OA equipment applications, there is a strong demand for lighter products, and therefore, resin frames having a specific gravity smaller than that of metal have been actively developed. In particular, since a thermoplastic resin can be applied to a melt molding method such as injection molding or extrusion molding, there is an advantage that a frame having a relatively complicated shape can be easily mass-produced. Various studies have been made to reduce the number of assembling steps and the number of assembling parts, such as integral molding of the frame and the housing, as well as the frame alone. Especially when assembling heat-generating functional parts, used in cold regions, or mounted on transportation vehicles, in order to compensate for the lack of performance in heat resistance, low-temperature strength, fatigue resistance of the resin frame,
High performance resins such as engineering resins, polymer alloys, and filler reinforced resins are used. In particular, a polymer alloy that can relatively freely design resin performance according to required physical properties and cost is particularly effective.

[0004] In the assembling process, it is necessary to join each functional component to the frame, and joining methods such as screwing, caulking, adhesives, welding, and the like are employed. However, when the frame is made of resin, if the joint is made by a point joining method such as screwing or caulking, stress is locally concentrated and the frame is easily broken. In order to avoid this, a method of increasing the number of joining points is conceivable, but this is not a good measure because it leads to an increase in the number of assembly steps and the number of joining parts. In addition, miniaturization of products and diversification of design shapes cause spatial restrictions at joints, and in many cases, screw tightening and caulking cannot be performed.

[0005] On the other hand, in the case of adhesive and welding, since the joints can be made on the surface, the stress concentration at the joint can be alleviated.
Contains another problem. In the case of welding, since each functional component is not necessarily made of the same material as the resin frame, it is difficult to directly join the resin frame without some work on the functional component side. In addition, adhesives are used in various applications depending on the situation because different types of materials can be joined together.However, the adhesive causes cracks in the resin, the handling in the bonding process is complicated, and the drying process is difficult. There is a problem that it is necessary, and it is difficult to collect functional components due to difficult disassembly at the time of disposal. As described above, when the frame is made of resin, there is some problem in joining with the functional component.

[0006] Therefore, there is a method in which an insert molding method is applied at the time of frame molding by utilizing the characteristics of the thermoplastic resin, and the resin is wrapped around each functional component to complete the assembly together with the frame at once. This eliminates the need for joining in the assembling process, and is therefore ideal for a resin frame assembling method.

However, when the material of each functional component to be inserted is metal or ceramics, a new problem occurs after assembly. One is the problem of adhesion between the resin and the functional component to be inserted. If the adhesion is poor, misalignment easily occurs due to impact such as dropping. As a countermeasure, Japanese Patent Application Laid-Open No. 4-169214
As disclosed in Japanese Unexamined Patent Publication (Kokai) No. H11-260, an insert molded body using a resin material blended with a thermoplastic polyester resin, a polycarbonate resin, a fibrous filler, or the like is proposed, by using a resin having excellent adhesion to metals and ceramics. is there. The other is that the linear expansion coefficient of the resin is remarkably large as compared with metals and ceramics, and after the resin is shrunk after molding, a tensile stress is generated in the resin around the functional component and cracks are easily generated. As a countermeasure against these problems, first, the thickness of the resin surrounding the functional component should be sufficient, and the design should be such that it can withstand the tensile stress generated by the difference in thermal shrinkage, and a metal or inorganic fibrous filler should be added to the thermoplastic resin. There is a method of mixing and lowering the linear expansion coefficient of the resin.

[0008] By taking the above measures, depending on the product design, the insert molding method is applied to the assembly of the resin frame, and all the functional parts are assembled to the resin frame in a single molding process to complete the assembly at a stretch. It seems possible to do so. However, in reality, there are three-dimensional restrictions such as the shape of the finished product and the layout of each functional component.

[0009]

Therefore, it is considered to divide the assembly into units that can be insert-molded. That is, each functional component is grouped into one or more groups, and insert molding is performed for each functional component or functional component group. Then, in the next step, the resin part of the molded body inserted into the molded body and the resin frame are joined to complete an assembly. In this case, unlike the case of joining different materials such as a functional component and a resin frame, the heat welding method can be applied because the joining of the resin frames may be considered. Therefore, it is considered that joining by the heat welding method can avoid problems such as stress concentration due to joining at a point and complicated handling due to use of an adhesive.

The resin frame may be made thick to compensate for the lack of rigidity of the material, or may have a shape having ribs.
Kneading and mixing the fibrous filler are performed. When joining frames of such shape and material by heat welding, the method of joining by heat conduction from an external heat source cannot be heated uniformly to the center of the joining surface, and it is not appropriate because sufficient joining strength cannot be obtained It is. Therefore, it is effective to use a method in which the material of the joining surface itself generates heat and is uniformly heated and joined. However, even if the joint strength is improved as described above, the portion where the resin frame is damaged is often the joint, and the joint has essentially low strength. Even if the joint cross section can be uniformly welded, the joint should be considered as a so-called defective portion such as a weld or a notch. When a thermoplastic resin having higher heat resistance is used, or when a large amount of filler is mixed and mixed, the strength of the joint portion decreases more and more conspicuously.

[0011]

In view of the above problems,
A thermoplastic resin composition comprising a polycarbonate resin, a thermoplastic polyester resin, and a specific graft copolymer is used as a resin frame, and the resin part of the resin insert molded body after the functional component is insert molded is heated to the resin frame. When welding was performed, it was found that the strength of the joint that was easily broken in the conventional resin material was significantly improved, and the present invention was reached. That is, the present invention provides (A) a polycarbonate resin of 20 to 87% by weight,
(B) 10 to 60% by weight of a thermoplastic polyester resin, and (C) a rubber-like polymer, a vinyl-based monomer selected from the group consisting of an aromatic vinyl monomer, a vinyl cyanide monomer, and a methacrylate ester. Using a thermoplastic resin composition comprising 3 to 30% by weight of a graft copolymer obtained by graft copolymerizing at least one kind of a monomer, a resin frame of a molded article made of the thermoplastic resin composition and an assembly are formed. This is a resin frame assembly in which a molded article obtained by insert-molding a functional component is obtained, and a resin frame and a resin portion of the insert-molded molded article are joined by a heat welding method.

Hereinafter, the thermoplastic resin composition of the present invention will be described in detail. The (A) polycarbonate resin constituting the resin frame material of the present invention is not particularly limited as long as it is a polymer or a copolymer obtained by a phosgene method or a transesterification method using an aromatic hydroxy compound as a raw material. As the aromatic hydroxy compound, bis (4-hydroxyphenyl) methane, 1,1-bis (4
-Hydroxyphenyl) ethane, 2,2-bis (4-hydroxyphenyl) propane, 2,2-bis (4-hydroxyphenyl) butane, 2,2-bis (4-hydroxyphenyl) octane, bis (4-hydroxy Phenyl) phenylmethane, 2,2-bis (4-hydroxy-
Bis (hydroxyaryl) alkanes such as 3-methylphenyl) propane, 1,1-bis (4-hydroxy-3-t-butylphenyl) propane, 1,1-bis (4-hydroxyphenyl) cyclopentane, 1,1-
Bis (hydroxyaryl) cycloalkanes such as bis (4-hydroxyphenyl) cyclohexane, 4,
Dihydroxydiaryl ethers such as 4'-dihydroxydiphenyl ether and 4,4'-dihydroxy-3,3'-dimethyldiphenyl ether;
Dihydroxydiaryl sulfides such as dihydroxydiphenyl sulfide and 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfide; 4,4'-
Dihydroxydiarylsulfoxides such as dihydroxydiphenylsulfoxide and 4,4′-dihydroxy-3,3′-dimethyldiphenylsulfoxide;
And dihydroxydiarylsulfones such as 4'-dihydroxydiphenylsulfone and 4,4'-dihydroxy-3,3'-dimethyldiphenylsulfone. These may be used alone or as a mixture of two or more types. In addition, piperazine, dipiperidyl, hydroquinone, resorcin, 4,4′-dihydroxydiphenyl, and the like may be used in combination. Among the polycarbonate resins using these as raw materials, 2,2-bis (4-hydroxyphenyl) -propane (bisphenol A type)
Polycarbonates are particularly preferred.

The viscosity average molecular weight of the polycarbonate resin must be 15,000 or more from the viewpoint of impact strength. On the other hand, if the viscosity average molecular weight exceeds 30,000, the melt viscosity becomes high, so that injection molding becomes difficult. Therefore, the viscosity average molecular weight of the polycarbonate resin used in the present invention is preferably in the range of 18,000 to 28,000.

The thermoplastic polyester resin (B) that can be used in the present invention is not particularly limited as long as it contains an alkylene terephthalate repeating unit as a main component. As the alkylene terephthalate repeating unit, ethylene terephthalate, tetramethylene terephthalate, 1,4-
Cyclohexylene terephthalate and the like can be mentioned, and copolymerizable components include dicarboxylic acids such as isophthalic acid and diols such as 1,3-propanediol.
Specific examples include polyethylene terephthalate, polybutylene terephthalate, and poly-1,4-cyclohexylene terephthalate, and polyethylene terephthalate or polybutylene terephthalate is particularly preferred.

The intrinsic viscosity of polyethylene terephthalate or polybutylene terephthalate is determined by using phenol / tetrachloroethane = 6/4 (weight ratio) as a solvent at a temperature of 30.
A value measured at a temperature in the range of 0.5 to 1.5 (dl / g) is used. In the case of polyethylene terephthalate, it is 0.6 to 1.1 (dl / g). In the case of polybutylene terephthalate, The range of 0.8 to 1.4 (dl / g) is particularly preferred.

[0016] The graft copolymer (C) which can be used in the present invention is a rubber-like polymer obtained by adding a vinyl-based monomer selected from the group consisting of an aromatic vinyl monomer, a vinyl cyanide monomer and a methacrylate ester. It is a graft copolymer obtained by graft copolymerizing at least one kind of a monomer. Examples of the rubbery polymer include a butadiene polymer, a copolymer of butadiene and a vinyl monomer copolymerizable therewith, a copolymer of -N-butyl acrylate and ethyl acrylate, and a copolymer of acrylic acid -N- Copolymers of butyl and acrylonitrile, copolymers of ethylene, propylene and diene, block copolymers of butadiene and aromatic vinyl and the like can be mentioned. Examples of the aromatic vinyl monomer constituting the graft copolymer include styrene monomers such as styrene, α-methylstyrene, vinyltoluene, t-butylstyrene, and chlorostyrene, and substituted monomers thereof. Particularly, styrene and α-methylstyrene are preferred. Examples of the vinyl cyanide monomer constituting the graft copolymer include, for example, acrylonitrile,
Examples thereof include methacrylonitrile and α-chloroacrylonitrile, and acrylonitrile is particularly preferable. Examples of the methacrylate constituting the graft copolymer include methyl methacrylate and ethyl methacrylate.
Particularly, methyl methacrylate is preferred.

(C) The graft copolymer comprises 0 to 70 mol% of an aromatic vinyl monomer and 0 to 60 mol% of a vinyl cyanide monomer.
20 to 70 parts by weight of a monomer mixture of 0 to 100 mol% of a methacrylic acid ester and 30 to 8
Homogenized ABS copolymers, MBS graft copolymers, AES graft copolymers, acrylic graft copolymers, etc., or the above-mentioned copolymers copolymerized at a graft ratio of 30 to 100% with respect to 0 parts by weight Among them, a mixture of two or more of them may be used, and an ABS or MBS graft copolymer is particularly preferable. Incidentally, the graft copolymer of the present invention,
The rubbery polymer is obtained by graft copolymerization of a monomer, and may contain an ungrafted polymer.

The proportion of the thermoplastic resin composition used in the present invention is (A) 20 to 87% by weight of a polycarbonate resin, (B) 10 to 60% by weight of a thermoplastic polyester resin, and (C) a rubbery polymer. A graft copolymer obtained by graft copolymerizing at least one kind of a vinyl monomer selected from the group consisting of an aromatic vinyl monomer, a vinyl cyanide monomer and a methacrylate ester is preferably 3 to 30% by weight. It is.

(A) 20% by weight of polycarbonate resin
If the amount is less than the above, sufficient heat resistance and impact resistance of the thermoplastic resin composition cannot be obtained, so that cracks and thermal deformation are likely to occur during use of the assembly. In addition to the lack of performance, there is a possibility that the functional component is displaced due to insufficient adhesion with the inserted functional component in the assembly, and in the worst case, the functional component is displaced. (B) When the thermoplastic polyester resin is less than 10% by weight, when the thermoplastic resin composition is molded, the fluidity at the time of molding is insufficient, and the adhesion to the functional component inserted in the assembly is insufficient. Therefore, the functional component tends to shift, and if it exceeds 60% by weight, the heat resistance and impact resistance of the composition are insufficient, so that cracks and thermal deformation easily occur during use of the assembly. If the content of the graft copolymer (C) is less than 3% by weight, sufficient impact resistance of the thermoplastic resin composition cannot be obtained, so that cracks are likely to occur during use of the assembly, and if it exceeds 30% by weight. Due to the lack of rigidity and heat resistance of the composition, the assembly is easily thermally deformed.

As the thermoplastic resin composition used in the present invention, a general method for producing a thermoplastic resin composition can be applied. For example, after each component is previously mixed in a blender such as a tumbler, a three-hands mixer, and a Henschel mixer, pelletized by a Banbury mixer, a Brabender, a kneading roll, a single-screw and a twin-screw extruder, or by using a quantitative feeder or the like. A method of supplying each component from a main or side feed port of a twin-screw extruder and pelletizing the component is exemplified. The pelletized thermoplastic resin composition,
It can be used for insert molding by a general injection molding machine or the like. Also, pelletization by an extruder is omitted,
After the respective components are preliminarily mixed, they can be directly kneaded in a plasticizing step of an injection molding machine and then directly subjected to insert molding.

The thermoplastic resin composition used in the present invention may further contain a filler, a heat stabilizer, an antioxidant, an acid anhydride, a flame retardant, an antistatic agent, an ultraviolet absorber, a lubricant, It is also possible to add a coloring agent and the like.

In particular, the addition of a filler is effective in increasing the rigidity of the resin frame itself and when used for the purpose of lowering the coefficient of linear expansion of the thermoplastic resin composition. As specific fillers, glass fiber, carbon fiber, silicon carbide fiber, alumina fiber, inorganic fiber such as alumina-silica fiber, organic fiber such as aramid fiber, metal fiber such as stainless steel fiber, carbon single crystal, Examples include whiskers such as potassium titanate single crystal, glass flakes, glass beads, mica, talc, and bentonite. The filler may be subjected to a surface treatment or a bunching treatment for the purpose of improving the adhesion to the thermoplastic resin composition.

The addition of a heat stabilizer is effective in suppressing the thermal deterioration of the molten thermoplastic resin composition when molding the resin frame, and a compound such as a hindered phenol compound or a phosphorus compound is used. it can. As the hindered phenol compound, triethylene glycol-bis [3-
(3-t-butyl-5-methyl-4-hydroxyphenyl) propionate], 1,6-hexanediol-bis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate], penta Erythrityl-tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate], octadecyl-3-
(3,5-di-t-butyl-4-hydroxyphenyl)
Propionate, N, N'hexamethylenebis (3,5
-Di-t-butyl-4-hydroxy-hydrocinnamide), 3,5-di-t-butyl-4-hydroxy-benzylphosphonate-diethyl ester and the like.

As the phosphorus compound, a phosphite or phosphite organic compound is preferable. Triphenyl phosphite, tricresyl phosphite, trisnonyl phenyl phosphite, triisooctyl phosphite, triisodecyl phosphite, Tristearyl phosphite, trioleyl phosphite, bis (2,4-di-t-butylphenyl) pentaerythritol-di-phosphite, bis (2,6-di-t-butyl-4-methylphenyl) pentaerythritol -Ji-
Tertiary phosphites such as phosphites, secondary phosphites such as di-2-ethylhexyl hydrogen phosphite, dilauryl hydrogen phosphite, dioleyl hydrogen phosphite, ethyl acid phosphate, butyl acid phosphate And acid phosphates such as 2-ethylhexyl acid phosphate, lauryl acid phosphate, stearyl acid phosphate, oleyl acid phosphate, and di-2-ethylhexyl phosphate.

Next, the resin frame assembly of the present invention will be described. The resin frame assembly of the present invention uses the thermoplastic resin composition to obtain a resin frame of a molded article made of the thermoplastic resin composition, and a molded article obtained by insert-molding a functional component constituting the assembly, and further comprising a resin. It can be assembled by a method of joining the frame and the resin portion of the molded article obtained by insert molding by a heat welding method.

In the insert molding in the present invention, the molding method is not particularly limited as long as the functional component to be inserted and the resin are integrated when the resin in a molten state is cooled to be shaped. . For example, in injection molding, a method of making a mold by injecting a molten resin into a mold in a state where a functional component to be inserted is set in advance in a cavity of a mold, and in extrusion molding, continuously inserting a functional component to be inserted. A method of producing in the form of coating may be mentioned.

The functional component constituting the assembly according to the present invention is not particularly limited as long as the shape and function of the component are not impaired by a rise in temperature upon contact with the molten resin during insert molding. Preferably, it is made of metal or ceramic material or packaged with metal or ceramic material.

The method for thermally welding the resin frame and the resin part of the insert-molded article in the present invention is not particularly limited as long as it is a method for welding the resin part of the resin frame and the insert molded article by heating. A welding method using heat generated by the material itself is preferable. Specific examples include a friction welding method, an ultrasonic welding method, and a high-frequency welding method.

[0029]

EXAMPLES The present invention will be described below in detail with reference to examples, but the present invention is not limited to the examples. Unless otherwise specified, the unit used for the added amount means% by weight or part by weight.

Examples 1 to 3 and Comparative Examples 1 to 6 The thermoplastic resin compositions used in the present invention are shown. (1) Raw material of thermoplastic resin composition (A) Polycarbonate resin: commercially available bisphenol A
Type polycarbonate resin "Calibur 200-13" (manufactured by Sumitomo Dow) (viscosity average molecular weight 21,500) was used.

(B) Thermoplastic polyester resin (B-1) Polyethylene terephthalate resin: Commercially available polyethylene terephthalate resin "NEH-2050"
[Unitika Ltd.] was used. (B-2) Polybutylene terephthalate resin: A commercially available polybutylene terephthalate resin "1200S" (manufactured by Toray Industries, Inc.) was used.

(C) Styrene / acrylonitrile / butadiene graft copolymer: polybutadiene latex 1
00 parts (solid content 50%, average particle size 0.35 μm, gel content 90%), sodium stearate 1 part, sodium formaldehyde sulfoxylate 0.1 part, EDT
A tetrasodium salt 0.08 part, ferrous sulfate 0.00
3 parts and 200 parts of pure water were charged into a reactor equipped with a stirrer and purged with nitrogen gas. After heating to a temperature of 65 ° C., 50 parts of a monomer mixture consisting of 25% of acrylonitrile and 75% of styrene, 0.3 part of t-dodecyl mercaptan,
0.2 parts of cumene hydroperoxide was continuously added over 4 hours, and after the addition was completed, polymerization was carried out at 65 ° C. for 2 hours.
The graft ratio was 78%, and the polymerization ratio was 97%. After adding an antioxidant to the obtained latex, salting out with calcium chloride, washing with water and drying, a white powdery copolymer obtained was used.

(2) Production Method of Thermoplastic Resin Composition The thermoplastic resin compositions in Examples and Comparative Examples were prepared by uniformly mixing the raw material resins shown in Tables 1 and 2 in a mixing ratio of parts by weight using a tumbler. After that, the single screw extruder “MS40
Pellets were produced at a cylinder temperature of 270 ° C. using “−32V” (produced by IKG Co., Ltd.). Using the pellets thus produced, a test piece was produced at a cylinder temperature of 270 ° C. and a mold temperature of 60 ° C. using an injection molding machine “IS-55EPN” (manufactured by Toshiba Machine Co., Ltd.) and used for measuring physical properties. A part of the test piece was used for a frame of a resin frame assembly.

(3) Insert molding and assembly by heat welding method Using a pellet of the thermoplastic resin composition prepared in the above (2), a metal disk having an outer diameter of 50 mm and a thickness of 5 mm is used as a functional component and an injection molding machine "Nestal". 75 "(manufactured by Sumitomo Heavy Industries, Ltd.), insert molding was performed at a cylinder temperature of 270 ° C. and a mold temperature of 60 ° C. with a resin thickness of 3 mm. FIG. 1 is a plan view of the molded body, and FIG. 2 is a longitudinal sectional view of AA ′ in the plan view. The molded body was provided with a welding rib having a regular triangular cross section of 1 mm on a side at the center of the circumferential resin portion.

In order to assemble the two insert moldings, the center point of the two insert moldings is 127 mm.
A 127 mm long, 12.7 mm wide, 6.35 mm thick molded body made of the same type of thermoplastic resin composition is heat-welded by ultrasonic bonding to form a resin frame so that the resin frame assembly is formed at a distance of. Produced. Fig. 3 shows a plan view of the assembled product.
FIG. 4 shows a vertical sectional view of BB ′ in the plan view. The ultrasonic welder used at this time was welded with a pressure of 2 kg / cm ² , an oscillation time of 0.6 seconds and a holding time of 2 seconds with 1201B / P46A manufactured by Seidensha Electronics Industry Co., Ltd.

(4) Measurement and Evaluation Methods for measuring physical properties in Tables 1 and 2 are as follows. (A) Heat resistance under high load: According to ASTM D-648, test stress is 18.6 kgf / cm ² , length 127 mm, width 1
The heating deformation temperature of a 2.7 mm thick 6.35 mm test piece was measured. (B) Impact strength of notch: According to ASTM D-256, a notched Izod impact strength was measured using a test piece having a thickness of 6.35 mm under JIS standard conditions of an ambient temperature of 23 ° C and a humidity of 50%.

(C) Strength of the welded portion by ultrasonic welding: A welding rib running linearly perpendicular to the pulling direction on one side of the dumbbell surface at the midpoint between JIS No. 1 dumbbell fulcrum points for tensile testing. Was produced by injection molding. The cross-sectional shape of the welding rib is a regular triangle having a side of 1 mm. Subsequently, the dumbbell was cut at a position 2.5 mm away from the rib in a direction parallel to the welding rib. The two cut dumbbells were arranged as shown in FIG. 5, and an overlapped portion was formed by sandwiching a rib, and was fixed to a jig as it was. An ultrasonic welding horn was applied to the overlapped portion in a direction perpendicular to the surface of the dumbbell, and ultrasonic waves were oscillated while applying pressure to perform welding around the ribs. The ultrasonic welder used at this time was 1201B / P46A manufactured by Seidensha Electronics Co., Ltd.
The welding was performed at a pressure of 2 kg / cm ² , an oscillation time of 0.6 seconds, and a holding time of 2 seconds. ASTM D-6 for dumbbell specimen after welding
A tensile test was performed according to No. 38 to measure the strength of the weld.

(D) Assembly test (d-1) Drop test The resin frame assembly produced using the pellets of the thermoplastic resin composition produced in the above (2) was 1 m above the concrete floor. From the resin frame, and the state of damage of the resin frame due to the impact at the time of the fall was observed. In addition, if the adhesiveness between the inserted functional component and the resin is not sufficient, the functional component may be displaced from the resin portion due to an impact at the time of dropping. Therefore, the displaced state of the component was also observed. (D-2) Heat cycle test The resin frame assembly produced using the thermoplastic resin composition pellets produced in the above (2) was subjected to an environmental temperature of -40.
The assembly was observed after 5 cycles of cooling and heating at 3 ° C. and 85 ° C. each for 3 hours.

[0039]

[Table 1]

[0040]

[Table 2]

The drop impact strength of the resin frame produced by the assembling method in the present invention could be evaluated by a drop test of the assembled product. In addition, in the actual product level resin frame assembly, the resin frame may be made thicker, provided with ribs or formed in a complicated shape in order to impart a desired rigidity or design. The impact strength of the notch is also important. Therefore, the resin frame assembly is required to have comprehensive performance (such as balance of physical properties) in terms of an assembly drop test, strength of a welded portion, heat resistance under a high load, and impact resistance of a notch portion.

[0042]

According to the present invention, a molded article of the thermoplastic resin composition of the present invention is used for a frame of an assembly, and a resin frame assembly assembled by a heat welding method is not damaged by a shock such as dropping, and can be used in a severe environment. It can be used without being damaged or deformed.

[Brief description of the drawings]

FIG. 1 is a plan view of an insert molded body using a thermoplastic resin composition of the present invention.

FIG. 2 is a longitudinal sectional view of the insert molded body taken along AA ′ of FIG.

FIG. 3 is a plan view of a resin frame assembly obtained by joining a resin frame and two insert molded bodies using the thermoplastic resin composition of the present invention by ultrasonic welding.

FIG. 4 is a vertical sectional view of the resin frame assembly taken along BB ′ in FIG. 3;

FIG. 5 is a layout view for ultrasonic welding a JIS No. 1 dumbbell for ultrasonic welding strength evaluation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thermoplastic resin composition 2 Insert metal disk 3 Welding rib (Cross-sectional shape: equilateral triangle of 1 mm side) 4 Welded part 5 JIS No. 1 dumbbell with cut welding rib

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C08L 67:02 55:02) B29K 67:00 69:00 105: 06

Claims (3)

[Claims] 1. A polycarbonate resin 20 to 87
% By weight, (B) 10 to 60% by weight of a thermoplastic polyester resin, and (C) a rubbery polymer selected from the group consisting of an aromatic vinyl monomer, a vinyl cyanide monomer, and a methacrylate ester. Using a thermoplastic resin composition comprising 3 to 30% by weight of a graft copolymer obtained by graft copolymerizing one or more vinyl monomers, a resin frame of a molded article made of the thermoplastic resin composition, and an assembled product A resin frame assembly obtained by obtaining a molded article obtained by insert-molding the functional component constituting the above, and further by joining the resin portion of the molded article obtained by insert molding to the resin frame by a heat welding method. 2. A molded article obtained by insert-molding a resin frame of a molded article made of the thermoplastic resin composition and a functional component constituting an assembly, using the thermoplastic resin composition according to claim 1, further comprising: A method for assembling a resin frame assembly, comprising: assembling a resin frame and a resin portion of a molded article formed by insert molding by a heat welding method. 3. The method of claim 2, wherein (A) the polycarbonate resin is 2,2-
Bis (4-hydroxyphenyl) -propane (bisphenol A type) polycarbonate; (B) at least one thermoplastic polyester resin selected from polyethylene terephthalate and polybutylene terephthalate; and (C) a graft copolymer comprising an ABS graft copolymer. The resin frame assembly according to claim 1, wherein a thermoplastic resin composition comprising a polymer is used.