JPH0724863A - Injection molded object and production thereof - Google Patents

Abstract

PURPOSE:To enhance the adhesion of a treatment film in plating, painting, etc., by forming a molded object having a reinforced thick walled part and a hollow part by injection molding using a compsn. prepared by compounding a specific amt. of a polyester resin or ABS resin and a specific amt. of an inorg. filler and/or a rubber elastic material with a polycarbonate resin. CONSTITUTION:A compsn. containing no glass fiber is prepared by compounding 0-30 pts.wt. of an inorg. filler and/or a rubbery elastomer with 100 pts.wt. of a mixture consisting of 50-97wt.% of a polycarbonate resin and 50-3wt.% of a polyester or ABS resin and subjected to injection molding to obtain a molded object. This molded object has a reinforcing thick-walled part and a hollow part and it is necessary to apply surface coating treatment to the molded object. For example, in the case of a door handle for a car, a plate member 11 having the hollow part 14 integrally molded along with the reinforcing thick-walled part 12 is formed and, after this compsn. is molded, plating is applied to the surface 13 having no reinforcing thick walled part of the plate member. By forming a part to be coated as the hollow layer 14, the close adhesiveness of a film is markedly enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection-molded article containing a polycarbonate resin and an ABS resin as main components and having a hollow layer, and a method for producing the same. More specifically, it relates to an injection-molded article having a hollow layer and having a surface coating treatment such as plating on the surface, and a method for producing the same.

[0002]

2. Description of the Related Art From the viewpoints of light weight, corrosion resistance, and freedom of design, industrial materials such as automobile materials, home electric appliances materials, and building materials have been replaced by metal from plastic. However, plastics are inferior to metals in terms of mechanical strength such as tensile strength and flexural modulus, and in order to prevent these performances, reinforcement of the material with glass fiber, shape with thick wall structure, rib structure, etc. The structural improvement is intended to improve the mechanical strength of plastic products. On the other hand, in plastic products used for these purposes, it is also particularly important to satisfy the sensory required characteristics such as color tone and touch, and in order to satisfy these required characteristics, it is usual to perform special shape treatment (texturing) on the mold surface. Etc.), post-treatment of the surface of the molded body (plating treatment, paint coating treatment, printing, etc.), and various other methods.

When performing the above-mentioned plating treatment or paint coating treatment, the smoothness of the surface of the product before the treatment is extremely important for determining the appearance after the treatment. In the case of plastic materials reinforced with glass fibers, so-called "floating" phenomenon occurs in which glass fibers are deposited on the product surface, and in the thick structure or rib structure provided to maintain product strength, A so-called "sink" phenomenon occurs due to uneven heat shrinkage. Due to these phenomena, the smoothness of the product surface is greatly impaired,
This is handled by polishing the surface, plating, and increasing the film thickness of the paint, which is not preferable in terms of workability and paint cost. Further, in the plating treatment, in order to improve the adhesion between the plastic and the plating, methods such as selection of the type of synthetic resin itself, improvement of the composition, and addition of a special filler or additive are adopted.

However, it is natural that the selection of this material is based on the premise that the physical and chemical properties according to the intended use of the molded product are satisfied. Usually, the tensile strength and elongation, the impact strength, the bending strength, the resistance The items required include creep resistance, weather resistance (light) resistance, heat resistance, chemical resistance, and conductivity. From this point of view, polycarbonate resins, polyacetal resins, nylon resins and the like are generally and preferably used,
From the more practical viewpoint, polycarbonate resin is most preferable. Improved impact resistance in the case of polycarbonate resin,
ABS (acrylonitonil-
Butadiene-styrene) resin, MBS (methyl methacrylate-butadiene-styrene) resin, etc. are blended. The present applicant has studied such a polycarbonate resin for the purpose of improving its plating treatment characteristics, found that a specific composition is particularly excellent, and previously proposed (Japanese Patent Application No. 3-72121), There is a limit to the adhesiveness of coating treatment films such as plating treatment films and paint coating treatment films. This is because these products are manufactured by normal injection molding.
Since the molding is performed, the molding conditions such as the injection speed and the mold temperature affect the adhesiveness, and there is a problem that it is difficult to set the conditions for stabilizing the quality.

[0005]

SUMMARY OF THE INVENTION Therefore, the present invention is intended to provide a molded article for which an injection molding method is adopted among various constituent materials for automobiles, building materials, industrial equipment, etc., particularly automobiles requiring plating treatment or paint coating treatment. To improve the surface appearance and adhesion of automobile door handles, which have various structural materials, especially the structure is complicated, and which require the delicate surface treatment on the outer surface. Is.

[0006]

Means for Solving the Problems The inventors of the present invention have conducted extensive studies to solve the above problems, and as a result, the polycarbonate resin composition previously proposed by the applicant (Japanese Patent Application No. 3-72).
No. 121), and found that a smooth surface without sink marks can be obtained by forming a special hollow layer when producing an injection-molded article using a polycarbonate resin composition containing no glass fiber. Further, they have found that surprisingly excellent plating adhesion strength can be obtained, and have completed the present invention. That is, the gist of the present invention is, firstly, 50 to 97% by weight of (A) polycarbonate resin (B) polyester resin or 50 to 3% by weight of ABS resin and (A) and (B).
Of (C) an inorganic filler and / or a rubber-like elastic material in an amount of 0 to 30 parts by weight based on 100 parts by weight of the total amount of the glass fiber-free polycarbonate resin composition, An injection-molded body having a hollow layer and having a surface coating treatment, secondly the injection-molded body which is an automobile door handle, and thirdly, a gas pressure injection molding of a polycarbonate resin composition. A method for producing the above-mentioned first or second injection-molded article, which comprises performing surface coating treatment after injection molding by pressurizing a pressurized gas after starting injection injection into a mold for injection or before or after completion of injection injection. It is in.

The contents of the present invention will be described in detail below. The polycarbonate resin constituting the polycarbonate resin composition used in the present invention has the following general formula (1)

[0008]

[Chemical 1]

It is a polymer having a repeating unit represented by: Here, Z represents a mere bond or is an alkylene having 1 to 8 carbon atoms, an alkylidene having 2 to 8 carbon atoms, a cycloalkylene having 5 to 15 carbon atoms, a cycloalkylidene having 5 to 15 carbon atoms, SO ₂ , SO, O, CO or formula

[0010]

[Chemical 2]

It means a group represented by: X represents a hydrogen, chlorine or bromine atom or a saturated alkyl group having 1 to 8 carbon atoms, and a and b each represent an integer of 0 to 4.

This polycarbonate resin can be obtained by reacting a dihydric phenol with a carbonate precursor such as phosgene in the presence of a known acid acceptor and a molecular weight modifier in a solvent such as a solvent such as methylene chloride, or a dihydric phenol. And a carbonate precursor such as diphenyl carbonate.

Here, bisphenols are preferably used as the dihydric phenol, and 2,2-bis (4-hydroxyphenyl) propane [commonly called bisphenol A] is particularly preferable. Further, a part or all of bisphenol A may be replaced with another dihydric phenol. Examples of dihydric phenols other than bisphenol A include hydroquinone; 4,4'-dihydroxydiphenyl; bis (4-hydroxyphenyl) alkane;
Compounds such as bis (4-hydroxyphenyl) cycloalkane; bis (4-hydroxyphenyl) sulfide; bis (4-hydroxyphenyl) sulfone; bis (4-hydroxyphenyl) sulfoxide; bis (4-hydroxyphenyl) ether Bis (3,5-dibromo-4-hydroxyphenyl) propane; Bis (3,5
Mention may be made of halogenated bisphenols such as 5-dichloro-4-hydroxyphenyl) propane. These dihydric phenols may be homopolymers of dihydric phenols or copolymers or blends of two or more. Further, the polycarbonate resin used in the present invention may be a thermoplastic random branched polycarbonate obtained by reacting a polyfunctional aromatic compound with a dihydric phenol and / or a carbonate precursor.

These polycarbonate resins used in the present invention have a viscosity average molecular weight of 10,000 to 100,000 in consideration of mechanical strength and moldability of an injection molded product having a hollow layer or a thick portion for reinforcement. Preferred, especially 1
The optimum value is 3,000 to 40,000.

The ABS resin used in the present invention is an aromatic vinyl monomer in the presence of a conjugated diene rubber.
Two or more compounds selected from vinyl cyan monomer and unsaturated carboxylic acid alkyl ester monomer are known by emulsion polymerization method, bulk polymerization method, bulk / suspension polymerization method, emulsion / suspension polymerization method, etc. It is a graft polymer obtained by polymerization by a polymerization method. The graft polymer may include an ungrafted copolymer produced during graft polymerization or a copolymer prepared separately from the above-mentioned two or more compounds.

As the constituent ratio of the ABS resin, the conjugated diene rubber is 20 to 70% by weight, the aromatic vinyl monomer is 20 to 70% by weight, the vinyl cyan monomer and / or the unsaturated carboxylic acid alkyl ester. It is desirable that the amount of the monomer is 10 to 50% by weight. The conjugated diene rubber that constitutes the ABS resin includes polybutadiene, butadiene-styrene copolymer, butadiene-acrylonitrile copolymer,
Polyisoprene and the like can be used in combination without any problem. The aromatic vinyl monomer is styrene, α-methylstyrene, p-methylstyrene or the like. The vinyl cyan monomer is acrylonitrile,
Examples of the unsaturated carboxylic acid alkyl ester monomer include methacryl nitrile, and methyl acrylate, ethyl acrylate, methyl methacrylate, hydroxyethyl acrylate, and the like.

Generally, the glass transition temperature (Tg) of the rubber component
Varies depending on the composition of the rubber component, but Tg attributable to the main rubber component is preferably −65 ° C. or lower.
Here, the main rubber component refers to the rubber component if the rubber component is a single component (for example, polybutadiene or butadiene-styrene copolymer is used alone), and two or more rubber components are combined. In the case (for example, polybutadiene and butadiene-styrene copolymer are used together), the rubber component accounts for 50% by weight or more of the entire rubber. If 100% polybutadiene, Tg is -70.
It will be below ℃. In the butadiene-styrene copolymer, Tg increases as the copolymerization amount of styrene increases,
When this is the main component, it is preferable to adjust the copolymerization amount of styrene so that the Tg is −65 ° C. or lower. If the Tg of this main rubber component is higher than -65 ° C, PC / A
This is not preferable because the low temperature impact properties of the BS composition tend to deteriorate.

The conjugated diene rubber component is preferably 20% by weight or more and 70% by weight or less, preferably 40% by weight or more and 65% by weight or less as described above. PC / A below 20% by weight
When used as a BS composition, the plating characteristics (plating deposition stability in the general ABS resin plating step) are reduced, and the low temperature impact characteristics are also reduced. Also, if it exceeds 70% by weight, PC
/ It is not preferable because the heat resistance and rigidity of the ABS composition are lowered.

The polyester resin used in the present invention is a polyester having an ester bond of an aliphatic or aromatic polyhydric carboxylic acid and an aliphatic or aromatic polyhydric alcohol, and is preferably polyethylene terephthalate or pobutylene terephthalate. Is selected.

In the present invention, an inorganic filler is preferably used in order to improve the rigidity of the injection-molded article and the effect of surface coating treatment such as plating treatment. As the inorganic filler, calcium carbonate or aluminum silicate is used. Fillers usually used for improving the rigidity of plastics such as magnesium silicate (for example, minerals such as talc), silica, aluminum hydroxide, aluminum oxide, carbon black, zinc oxide, magnesium oxide, mica are preferably used.
In the present invention, polycarbonate resin such as glass fiber,
Fibers having a low affinity for the ABS resin or these compositions are not used because they protrude onto the surface of the molded product or reduce the adhesion (adhesion) in the plating treatment or the paint coating treatment after molding. The reinforcing effect conventionally obtained by filling the glass fiber can be achieved by increasing the thickness and forming the hollow layer described later.

In the present invention, a rubber-like elastic body is preferably used in order to further improve the impact resistance of the injection-molded article, and the rubber-like elastic body is usually MAS, M.
There is a core shell elastomer called BS.

Next, the mixing ratio of each component will be described.
The blending ratio of the polycarbonate resin and the ABS resin is selected such that the former is 50 to 97% by weight and the latter is 3 to 50% by weight. If the polycarbonate content is less than 50% by weight, the impact resistance and heat resistance will decrease, while if it exceeds 97% by weight, the fluidity of the composition will decrease, making injection molding itself having a hollow layer impossible, and neither can be adopted. . When the polyester resin or the ABS resin is less than 3% by weight, the fluidity is lowered and not only the injection molding having the hollow layer becomes difficult but also the plating adhesion strength is lowered. If it exceeds 50% by weight, impact resistance and heat resistance are deteriorated, which are both unfavorable.

The inorganic filler other than the polycarbonate resin and the ABS resin and / or the rubber-like elastic material is added in an amount of at most 30 parts by weight based on 100 parts by weight of the above-mentioned resins. It is not preferable because the strength of the injection molded body is rather lowered.

The above-mentioned PC / ABS composition can be subjected to a plating treatment by a usual ABS resin plating line, and can also be subjected to a usual coating treatment such as a paint coating and a printing treatment. . The paint coating treatment according to the present invention is
Organic solvent solution of paint (eg (solvent) thinner / (solute) acrylic acid ester), emulsion solution, solution using reactive monomer as solvent (eg epoxy compound / amine compound), acrylic acid ester / isocyanate, etc. Conventional polycarbonate molded article The paints used in the above are included, and are not particularly limited by the type.

In the present invention, at least the portion of the injection-molded article to be subjected to the plating treatment or the paint coating treatment is required to be a hollow layer, and the formation of this hollow layer results in the adhesion (adhesion) of the film formed by the above-mentioned treatment. It is surprising that the sex is significantly improved. The injection-molded article according to the present invention,
As described above, at least the surface-coated portion (plating treatment or paint coating treatment) is characterized by having a hollow layer. As a method for forming a hollow layer in an injection-molded article, a normal injection molding method is used. It can be used, and specifically, it is a method of injecting an inert gas from the resin injection port or another injection port after the start of injection of the molten synthetic resin and before or until the end of injection. Several proposals have been made in the past (Japanese Patent Publication No. 57-14968, Japanese Patent Application Laid-Open No. 63-268611, Japanese Patent Application Laid-Open No. 3-138126, Japanese Patent Application Laid-Open No. 4-272815). The method according to the present invention can use these conventional methods as they are, and is not limited to the specific method.

The temperature of the gas to be injected is not particularly limited, and may be room temperature, or may be the same as or higher than the temperature of the molten synthetic resin to be injected. .

As described above, the hollow layer can be formed by the injection molding method, and the wall body having the hollow layer between the front and back surfaces usually has higher flexural strength and flexural rigidity than the case without the hollow layer.
The front and back walls themselves are thin and weak against external force. Further, since a reinforcing wall that extends between both surfaces cannot be formed in the hollow layer portion, that is, inside the molded body, the impact strength of the entire wall body is weak. In the present invention, the adhesion (adhesion) strength of the plating film or the paint coating film is dramatically improved by forming the hollow layer,
Of the outer surface of the wall surface having the hollow layer, preferably, the technical effect of obtaining an injection-molded article having an excellent surface coating, on the other hand, is not lost due to the strength decrease due to the formation of the hollow layer, The feature is that a thick portion for reinforcement is appropriately formed on the back surface. The shape of this thick part for reinforcement,
The position is not particularly limited, but it is natural that it is preferably formed at a position in place of the reinforcing wall that cannot be formed across both walls in the molded body, and usually does not affect the appearance, It is formed as a rib on the back side of the molded product. This rib is variously selected from a wide width but a low height to a narrow width but a high height.

In the case of a door handle for an automobile, the grip portion on the front side must be plated or paint-coated, but by forming a hollow layer in the grip portion, the adhesion (adhesion) strength of the treated film can be increased. Can
Further, the strength can be reinforced by forming the reinforcing thick portion corresponding to various stresses that the door handle receives on the back side of the grip portion, and an excellent door handle as a whole can be obtained.

The formation of the thick portion as a reinforcing measure brings about a sink phenomenon on the outer surface on the side without the thick portion unless the hollow layer is formed, and deteriorates the appearance characteristics. The smoothing of the sink marks is technically complicated, and the amount of materials used is large, and the means of partially thickening is a technique that has been avoided in the past. According to the present invention, even if this thickening technique is positively used, no sink mark is generated, and conversely, it is used for reinforcement to enable hollow layer molding and to adhere (bond) the coating film. ) Is improved.

Next, a surface-coated injection-molded article having a reinforcing thick portion and a hollow layer of the present invention and a method for producing the same will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a plate member 11 having a hollow layer 14 integrally formed with a reinforcing thick portion 12 according to the present invention. FIG. 2 is for explaining a door handle for an automobile according to the present invention, and shows a front external view of the state where the handle 21 is attached to a door D of the automobile. FIG. 3 is a perspective view from the front side lower side (the side below which the hand of the grip 22 is inserted) with the door handle removed, and FIG.
6 is a perspective view from above (FIG. 6 side), FIG. 5 is a side view of the automobile door handle 21 (a Z ₁ -Z ₁ arrow view of FIG. 6), and FIG. 6 is a front view of the door handle 21 (FIG. 5 of X _1-
An X ₁ arrow view), FIG. 7 is a perspective view showing the mounting position relationship between the grip 22 and the structural member such as an arm of the rear side in the front view shown in FIG. 6, FIG. 8 is the door FIG. 6 is a rear view of the handle 21 (a view taken along the line Y ₁ -Y _{1 in} FIG. 5), and FIGS. 9, 10 and 11 respectively show W ₁ -W ₁ in FIG.
V ₁ is -V _1, T ₁ -T ₁ cut end Men'ya plan view.

FIG. 12 corresponds to the case where there is no hollow layer in FIG. 1, and the layer thickness of the resin alone is the same. FIG. 13 corresponds to the case where there is no hollow layer in FIG. 5, and is a door handle 6 for an automobile having a thick portion for reinforcement.
Is a side view of a 1 (Z ₂ -Z ₂ arrow view in FIG. 14), FIG. 1
4 is a front view of the vehicle door handle 61 (X in FIG. 13).
A ₂ -X ₂ arrow view), FIG. 15, 16 and 17 respectively, a _{W 2 -W 2, V 2 -V} 2, T 2 -T 2 cut end Men'ya view of figure 14.

In FIG. 1, the surface 13 of the body portion of the plate member 11 on the side where the thickening portion 12 for reinforcement is not provided is plated. The gas of the hollow layer 14 is an example in the case of being injected from the same gate as the injection of the resin at the time of injection molding, and this injection position is indicated by 15. Even if there is the thick portion 12, there is no sink mark on the surface 13. FIG. 2 is a front view of a typical case where the vehicle door handle 21 is attached to the door D. Usually, this door handle is elastically attached to the door, and a fingertip is inserted. If it is pulled out, it rotates about a predetermined axis as a rotation axis, and opens the door, but returns to its original position when the hand is released. Therefore, this door handle must be able to withstand a considerable number of repeated rotational stresses and the like, and is a part of a vehicle member that requires a special reinforcing structure.

3 and 4 show a door handle 21 for an automobile.
FIG. 12 is a perspective view viewed from two predetermined directions for facilitating a conceptual understanding of the door handle, and FIGS. 5 to 11 are schematic representations of the door handle for facilitating the understanding of the structure of the door handle of the present invention. 5 to FIG. 8 show the appearance mainly, and FIGS. 9 to 11 show various sectional views. The common parts are designated by the same reference numerals.

On the back surface of the grip portion 22, which is located on the front side, a ceiling portion 24 continuing from the edge above the grip portion, and the ceiling portion 24.
Continuing on, the arm mounting portion 23 configured to be parallel to the back surface of the grip portion, the ceiling portion 24, and the rib 25 for structurally reinforcing the arm mounting portion 23 are formed, and a portion for inserting a finger as a whole is formed. The room is made up. Further, the arm mounting portion 23 is formed with a thick arm 26 which is curved upward toward the rear side of the grip portion and is integrally formed. The arm 26 extends through the curved portion 26a, which is usually the central axis of rotation of the door handle. Furthermore, on the lower side of the grip back surface 22b,
A thick portion 22c for preventing deformation of the grip portion 22 is provided in parallel with the grip portion.

At the rear of the grip portion, there is an arm 26 connected to the gate portion for injection molding and having a gas injection port 26e. By gas injection from this, the gas enters the molded body and the gas flows through the arm 26, Grip 2 through the ceiling 24
2, a continuous hollow layer 26d-24d-22d is formed, but if a plurality of gas inlets are formed, the hollow layer 26d, 24d, 22d becomes continuous or discontinuous similarly to the above. Due to the formation of the hollow layer, the opposite side having the rib 25 for structural reinforcement, that is, the grip surface 22a, and the opposite side having the thick portion 22c for preventing deformation of the grip, that is, the grip surface 22a and the portion where the ceiling portion 24 is attached are formed. No sinking phenomenon was observed on the opposite side, that is, the grip surface 22a.

The above-mentioned gas injection method is not particularly limited, and various known means can be applied. The gas may be injected from a resin injection nozzle, or may be introduced into the product cavity from a sprue, a runner, a gate, etc. by separately providing a gas passage in the mold. The gas is preferably an inert gas such as nitrogen gas. The gas pressure can be freely injected by making it higher than the injection resin pressure.

In injection molding, gas injection is preferably performed at least after the start of resin injection. The reason for this is that if the molten resin is injected in advance and gas is not injected at least after the contact surface with the mold begins to solidify, the gas will be ejected between the mold and the resin, and a gas layer will form there. This is because it is difficult to form the hollow layer in addition to roughening the surface of the resin molded body. On the other hand, the end of gas injection is not particularly limited as long as it is before resin injection, but if it is too early, naturally the volume of the hollow portion or the expansion of the hollow portion in the entire molded body decreases, and The purpose will not be achieved. Further, since there is no problem in ending the resin injection at the same time, this simultaneous ending method is the simplest in terms of process control. Molded without sink marks in this way,
The grip surface 22a having a smooth surface is plated. The adhesion strength of the plated film to the grip surface is superior to that without the hollow layer 22d, as shown in Examples below.

FIG. 12 shows an example in which the reinforcing thick portion 52 is formed on the thin plate member 51 without forming a hollow layer.
A sink mark 53p is generated on the surface 53. 13 to 17
Shows the door handle 61 without a hollow layer, of which FIGS. 13 and 14 show the appearance as the center, and FIGS. 15 to 17 show the cut end face at a predetermined position as the center. It was done. The same parts are designated by the same reference numerals. When the side view is shown in FIG. 13 and the molded article does not have a hollow layer formed by gas injection, the surface 62a of the grip 62 is struck by the sink marks 62r, 62q and the thick ceiling 64 and the ribs 65 and 62c for structural reinforcement. It can be seen that 62p has occurred.

[0039]

【Example】

(Examples 1 to 3) Using a gas injection injection molding machine (manufactured by Toshiba Machine Co., Ltd.), a mold clamping force of 100 tons, a cylinder set temperature of 280 ° C., and a mold set temperature of 70 ° C., corresponding to FIG. Has a shape that has a grip length of 10c
m, grip thickness 5 mm, width on the back side of grip 10 m
m, the height of 5 mm, the thickening portion of the door handle in the molding die, the polycarbonate resin composition of Table 1 in the amount of 75 to 95% by volume of the mold volume equivalent to injection filling, after the nitrogen gas (gas temperature 25 ℃ ) Was injected at 10 MPa to 15 MPa, and the inside of the mold was filled with a pressurized gas to obtain a molded product. The grip surface of this molded product was plated, and the procedure and conditions are shown in Table 2. The appearance (whether there was a sink mark or roughness) of the molded product was visually observed, and at the same time, the plating film adhesion strength was measured. The adhesion strength of the plating film was measured by a peeling test (90 ° peeling test) on the adhesion strength of the plated surface having a width of 10 mm. The results are shown in Table 3.

(Comparative Example 1) A glass fiber blend composition was used as the polycarbonate resin composition, no gas was injected, and the holding power was 70 MPa at a cylinder temperature of 300 ° C. and a mold temperature of 90 ° C. Injection molding and plating were performed in the same manner. The appearance of the molded product and the plating film adhesion strength were measured in the same manner as in the examples. The results are shown in Table 3.

(Comparative Examples 2 to 3) No gas injection, cylinder holding temperature 300 ° C, mold temperature 90 ° C, holding power 70MP.
Injection molding and plating were carried out in the same manner as in the example except that it was a. The appearance of the molded product and the plating film adhesion strength were measured in the same manner as in the examples. The results are shown in Table 3. (Only the comparative example 2 was plated.)

Comparative Example 4 Injection molding was carried out under the same conditions as in Example except that glass fiber was added to the polycarbonate resin composition.

[0043]

[Table 1]

[0044]

[Table 2]

[0045]

[Table 3]

[0046]

As is apparent from the above description, when a specific polycarbonate resin composition containing a polycarbonate resin and a polyester resin or an ABS resin as a main component is used and a surface coating treatment such as plating is performed on the surface of the injection molded article. The adhesion strength of the treated film can be extremely efficiently improved by forming a hollow layer at least in a portion where the plating layer is formed without making the injection molded body solid. Even if a thick reinforcing portion is formed on the back surface side of the hollow layer of the injection-molded product to reinforce the decrease in physical strength, the appearance (sink marks, etc.) of the injection-molded product and the plating adhesion (adhesion) strength are reduced. I can't do it. This effect has a complicated structure like an automobile door handle, and the appearance and weather resistance of the front plate are particularly important, and those having a surface coating treatment such as plating treatment and paint coating are particularly large.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a plate member having a hollow layer and a thick portion for reinforcement.

[Fig. 2] Front view of the automobile door handle attached state

FIG. 3 is a perspective view of a door handle.

FIG. 4 is another perspective view of the door handle.

[Figure 5] Side view of the door handle

FIG. 6 is a front view of the door handle.

FIG. 7 is a perspective view of a front view of a door handle.

FIG. 8: Rear view of door handle

FIG. 9 is a sectional view of a door handle

FIG. 10 is a sectional view of a door handle

FIG. 11 is a sectional view of a door handle.

FIG. 12 is a sectional view of a plate member having a reinforcing thick wall portion without a hollow layer.

FIG. 13: Side view of door handle without hollow layer

FIG. 14 is a front view of a door handle without a hollow layer.

FIG. 15 is a sectional view of a door handle without a hollow layer.

FIG. 16 is a sectional view of a door handle without a hollow layer.

FIG. 17 is a sectional view of a door handle without a hollow layer.

[Explanation of symbols]

11 ... Hollow layer, plate member having thickening portion for reinforcement 12 ... Thickening portion for reinforcement 13 ... Plate member surface 14 ... Hollow layer 21 ... Hollow layer, Door handle for automobile having thick portion for reinforcement 22 ... Grip portion 22a ... Surface of grip portion 22c ... Thick portion for reinforcement of deformation of grip portion 22d ... Hollow layer of grip portion 25 ··· Ribs 51 ··· Plate member having a reinforcing thick-walled part but no hollow layer 52p · · Sink 61 ··· Automotive door handle having no hollow layer and a reinforcing thick-walled part 62 ... Grip part 62a ... Grip part surface 62r, 62q, 62p ... Sink

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B29K 69:00

Claims (3)

[Claims] 1. A polycarbonate resin (A) 50-97% by weight (B) polyester resin or ABS resin 50-
3% by weight and 100 parts by weight of the total amount of (A) and (B) (C) inorganic filler and / or rubber-like elastic material 0 to 3
An injection-molded article, which is composed of a polycarbonate resin composition containing 0 parts by weight of glass fiber and does not contain glass fiber, has a reinforcing thick portion and a hollow layer, and is surface-coated. 2. The injection-molded article according to claim 1, which is an automobile door handle. 3. A pressurizing gas is injected into a gas pressure injection molding die after the injection injection is started and before the injection injection is completed or before the injection injection is completed. 2. The method for producing an injection-molded article according to item 2.