JP2000336235A - Resin for lamp body of vehicle lighting fixture, preparation thereof and vehicle lighting fixture using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin for use in a lamp body of a vehicle lighting fixture wherein the resin constituting a lamp body shows improved string forming characteristics irrespective of the seasonal change and the change in humidity, the string forming phenomenon occurring in the course of manufacturing a vehicle lighting fixture in which a lamp body is bonded to a lamp lens by a hot plate welding method. SOLUTION: This resin compsn. is obtd. by blending 97-70 wt.% of a rubber- reinforced styrene-based resin with 3-30 wt.% of a methacrylate homopolymer or a copolymer comprising a methacrylate ester as the main monomeric component and is used for a lamp body, wherein the lamp body comprising the rubber- reinforced styrene-based resin is melted by applying it to a heated hot plate and the melted part is pressed to a lamp lens to bond the lamp body to the lamp lens in order to fabricate a vehicle lighting fixture.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a headlamp, a turn signal, and a lamp body formed by joining a lamp body made of a rubber-reinforced styrene resin and a lamp lens made of a methyl methacrylate resin by a hot plate fusion method. The present invention relates to a vehicle lamp such as a stop lamp, a lamp body used therefor, and a method of manufacturing the same.

[0002]

2. Description of the Related Art As a method of joining a lamp body made of a synthetic resin and a lamp lens, there is a method of fixing the both with an adhesive. After the plate is pressed and melted, the so-called hot plate fusion method, in which the fused portion is pressed against a lamp lens made of methyl methacrylate resin, does not use any solvent unlike the case where it is fixed with an adhesive, It has been increasingly adopted from the viewpoint of environmental issues. However, in such a hot plate fusion method, after the thermoplastic resin constituting the lamp body such as the ABS resin is melted by the hot plate, when the hot plate is separated, the molten resin is stretched in a thread shape (hereinafter, referred to as a filament). , Referred to as "stringing"), which sometimes caused a defect that the appearance was poor due to the adhesion to the surface of the molded product of the lamp lens or the lamp body. As a method of improving the stringing in the hot plate fusion method, for example, Japanese Patent Application Laid-Open No. 9-12902 discloses a method in which a fluorine resin such as polytetrafluoroethylene is used.
There has been proposed a method of adding to a thermoplastic resin such as a resin. However, in this method, when the hot plate fusion method is performed in a low humidity environment such as winter, stringing may not be completely eliminated.

[0003]

SUMMARY OF THE INVENTION In view of the above problems, the present inventors have constructed a lamp body which is produced when a lamp body is manufactured by joining a lamp body to a lamp lens by a hot plate fusion method. An object of the present invention is to improve resin stringing irrespective of seasons and changes in humidity.

[0004]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve the above object, and as a result, a methacrylic ester homopolymer or a methacrylic acid ester as a main component has been added to a rubber-reinforced styrene resin. Molding a lamp body with a resin composition to which a copolymer of a monomer component is added, and further, as the rubber-reinforced styrene resin, a graft copolymer and a vinyl copolymer containing a specific component. By using the resin composition obtained by blending the main component with the main body, the lamp body and the lamp lens are joined by the hot plate fusion method to manufacture the vehicular lamp even in a low humidity environment such as winter. It has been found that the stringing at the time of drawing can be greatly improved, and the present invention has been completed.

That is, according to the present invention, after a heated hot plate is pressed against a lamp body made of a rubber-reinforced styrene-based resin and melted, the fused portion is pressed against a lamp lens to join the lamp body and the lamp lens. A copolymer of a methacrylic acid ester homopolymer or a monomer component containing a methacrylic acid ester as a main component with respect to 97 to 70% by weight of a rubber-reinforced styrenic resin used for a lamp body for manufacturing a vehicular lamp. A resin for a lamp body for a vehicle lamp, which is obtained by blending 3 to 30% by weight of the combined resin (Claim 1), wherein the rubber-reinforced styrene resin is 15 to 95 parts by weight of a rubbery polymer and 85 to 5 parts by weight of a monomer mixture. Parts by graft polymerization so that the total amount becomes 100 parts by weight, and the monomer mixture is composed of a vinyl cyanide compound, an aromatic vinyl compound and an alkyl ( At least one vinyl compound 99 is selected from the group consisting of data) acrylate compound.
9 to 60% by weight, other copolymerizable vinyl compound 0
100 to 10 parts by weight of a graft copolymer (A) comprising 30% by weight and 0.1 to 40% by weight of a glycidyl ester compound of an α, β-unsaturated acid; 10 to 40% by weight of a vinyl cyanide compound; Copolymer (B) 0-90 obtained by polymerizing 60 to 90% by weight of an aromatic vinyl compound and 0 to 30% by weight of another copolymerizable vinyl compound
The resin for a lamp body for a vehicle lamp (Claim 2) according to claim 1, which is a resin composition (C) containing a resin composition consisting of 100 parts by weight in total with the resin (Claim 2). The monomer mixture of (A) comprises 0 to 40% by weight of a vinyl cyanide compound, 60 to 90% by weight of an aromatic vinyl compound and 0 to 3% of an alkyl (meth) acrylate compound.
99.9 to 60% by weight of a vinyl compound composed of 0% by weight, 0 to 30% by weight of another copolymerizable vinyl compound,
3. The resin for a lamp body for a vehicle lighting device according to claim 2, which comprises 0.1 to 40% by weight of a glycidyl ester compound of an α, β-unsaturated acid (Claim 3), and a single amount of the graft copolymer (A). The resin for a lamp body for a vehicle lighting device according to claim 2 or 3, wherein the content of the glycidyl ester compound of α, β-unsaturated acid in the body mixture is 5 to 20% by weight. The glycidyl ester compound of an unsaturated acid is at least one selected from the group consisting of glycidyl acrylate, glycidyl methacrylate, and glycidyl ethacrylate.
The resin for a lamp body for a vehicle lighting device according to claim 5, wherein the homopolymer of methacrylic acid ester or the copolymer of a monomer component containing methacrylic acid ester as a main component is 100 to 100 methacrylic acid ester monomers. 80% by weight and 0 to 20% by weight of other copolymerizable monomers and their melt flow rates (230 ° C, 3.
The resin for a lamp body for a vehicle lighting device according to claim 2, 3, 4 or 5, wherein an 8 kg load) is 15 g / 10 min or more and 100 g / 10 min or less.
A heated hot plate is pressed against a lamp body formed by molding the resin for a lamp body for a vehicle lighting device according to 4, 5, or 6, and the molten portion is pressed against a lamp lens to press the lamp body and the lamp lens. And a method of manufacturing a vehicular lamp (Claim 7).
9. The method for manufacturing a vehicle lamp according to claim 7, wherein the method is performed by heating to 500 ° C. (claim 8), wherein a lens made of methyl methacrylate resin is used as the lamp lens. A heated hot plate is pressed against a lamp body obtained by molding the resin for a lamp body for a vehicle lamp according to the manufacturing method (claim 9), claim 1, 2, 3, 4, 5 or 6, and is melted. Then, the vehicular lamp (Claim 10) in which the fused portion is pressed against the lamp lens to join the lamp body and the lamp lens, and a lens made of methyl methacrylate resin is used as the lamp lens. Item 10. Vehicle lamp according to claim 10 (claim 11)
Is the content.

[0006]

It is particularly important in the present invention that a homopolymer of methacrylic acid ester or a copolymer of a monomer component containing methacrylic acid ester as a main component is contained in a resin composition used for molding a lamp body. It is that it is blended.

Examples of the methacrylate monomer include methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, and 2-ethylhexyl methacrylate.

The homopolymer of methacrylic acid ester or the copolymer of a monomer component containing methacrylic acid ester as a main component is preferably a methacrylic acid ester monomer 1
100 to 80% by weight and 0 to 20% by weight of other copolymerizable monomers and having a melt flow rate (230 ° C., 3.8 kg load) of 15 g / 10 min or more and 100 g / 10 min or less. is there. The measurement is based on ASTM
According to D-1238. Outside this range, the resin composition of the present invention is not preferred in terms of impact resistance. Other copolymerizable monomers include, for example, methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, hydroxyethyl acrylate, glycidyl acrylate, cyclohexyl acrylate, phenyl acrylate , Benzyl acrylate,
Glycidyl methacrylate, acrylic acid, methacrylic acid,
Examples include styrene, α-methylstyrene, acrylonitrile, vinyl acetate, ethyl vinyl ether, N-phenylmaleimide, and the like.

As a method for producing a homopolymer of methacrylic acid ester or a copolymer of a monomer component containing methacrylic acid ester as a main component, known bulk polymerization, suspension polymerization,
Examples include bulk-suspension polymerization, solution polymerization, and emulsion polymerization.

The amount of the methacrylic acid ester homopolymer or the copolymer of the monomer component containing methacrylic acid ester as a main component is from 97 to 7 of rubber-reinforced styrene resin.
3 to 30% by weight, preferably 10 to 2% with respect to 0% by weight
0% by weight. If the amount is less than 3% by weight, the effect of improving stringiness, particularly under low humidity, is not sufficient, and if it exceeds 30% by weight, the impact strength is reduced.

The rubber-reinforced styrenic resin used in the present invention includes ABS resin, AAS resin, AES resin and the like.
The resin composition (C) mainly containing a resin composition composed of 100 parts by weight in total of 10 parts by weight and 0 to 90 parts by weight of the vinyl copolymer (B) is preferable, and the graft copolymer (A) ) Is preferably the composition shown below. That is, the graft copolymer (A) is composed of the rubbery polymers 15 to 9
85 to 5 parts by weight of a monomer mixture is graft-polymerized to 5 parts by weight, and the monomer mixture is 0.1 to 40% by weight, more preferably 0 to 40% by weight, of a glycidyl ester compound of an α, β-unsaturated acid. 0.5 to 30% by weight, particularly preferably 5 to 2%
0 wt% as an essential component, and at least one vinyl compound selected from the group consisting of a vinyl cyanide compound, an aromatic vinyl compound, and an alkyl (meth) acrylate compound in an amount of 99.9 to 60 wt%, more preferably A vinyl compound 9 comprising 0 to 40% by weight of a vinyl cyanide compound, 60 to 90% by weight of an aromatic vinyl compound and 0 to 30% by weight of an alkyl (meth) acrylate compound
It is a graft copolymer comprising 9.9 to 60% by weight and 0 to 30% by weight of another copolymerizable vinyl compound.

In the graft copolymer (A), if the rubber-like polymer is less than 15 parts by weight, the impact strength of the lamp body is reduced, and if it exceeds 95 parts by weight, the fluidity of the resin is extremely poor, which is not preferable. . Further, if the glycidyl ester compound of the α, β-unsaturated acid in the monomer mixture to be graft-polymerized to the rubber polymer is less than 0.1% by weight, it is not sufficient when bonding to the lamp lens by the hot plate fusion method. If the stringing improvement effect is not obtained, and if it exceeds 40% by weight, the fluidity of the resin during molding of the lamp body and the impact resistance of the molded lamp body are undesirably reduced.

The rubbery polymer used in the graft copolymer (A) is not particularly limited, but may be polybutadiene rubber, styrene-butadiene rubber (SBR), acrylonitrile-butadiene rubber (NBR), butyl acrylate butadiene. Such as diene rubber, butyl acrylate rubber, butadiene-butyl acrylate rubber, 2-ethylhexyl acrylate-butyl acrylate rubber, 2-ethylhexyl methacrylate-butyl acrylate rubber,
Stearyl acrylate-butyl acrylate rubber, dimethylsiloxane-butyl acrylate rubber, silicone type /
Acrylic rubber such as butyl acrylate composite rubber; polyolefin rubber polymers such as ethylene-propylene rubber and ethylene-propylene-diene rubber; and silicone rubber polymers such as polydimethylsiloxane rubber. More than one species can be used in combination.

The average particle size of the rubbery polymer is preferably from 0.05 to 1 μm, more preferably from 0.07 to 0.4 μm.
μm is more preferred. As the rubbery polymer, those produced by an agglomeration enlargement method using an acid group-containing latex can also be used.

Α, which is graft-polymerized to the rubbery polymer,
Examples of the glycidyl ester compound of β-unsaturated acid include glycidyl acrylate, glycidyl methacrylate, glycidyl ethacrylate and the like, and these can be used alone or in combination of two or more. Specific examples of preferred glycidyl ester compounds include glycidyl methacrylate.

On the other hand, the vinyl copolymer (B) comprises 10 to 40% by weight of a vinyl cyanide compound, 60 to 90% by weight of an aromatic vinyl compound, and 0 to 30% by weight of another copolymerizable vinyl compound. It is a copolymer obtained by polymerization.

Examples of the vinyl cyanide compound used in the graft copolymer (A) or the vinyl copolymer (B) include acrylonitrile and methacrylonitrile, and the aromatic vinyl compounds include styrene and α. -Methylstyrene, p-methylstyrene, p-isopropylstyrene, chlorostyrene, bromostyrene and the like.

Examples of the alkyl (meth) acrylate compound include methyl (meth) acrylate, ethyl (meth) acrylate, and butyl (meth) acrylate. Further, other copolymerizable vinyl compounds include acrylic acid, methacrylic acid, maleimide compounds such as N-phenylmaleimide, vinyl acetate, ethyl vinyl ether and the like.
More than one species can be used in combination.

The graft copolymer (A) and the vinyl copolymer (B) are preferably obtained by emulsion polymerization, but may be produced by any polymerization method.
For example, any known polymerization method, such as a known bulk polymerization method, a solution polymerization method, a suspension polymerization method, an emulsion-suspension polymerization method, an emulsion-bulk polymerization method, may be used as long as it can be controlled to a composition within the range intended by the present invention. May be done. For example, in the case of the graft copolymer (A), the monomer mixture may be polymerized with a radical initiator in an aqueous medium in the presence of a rubbery polymer. At that time, the monomer mixture to be graft-polymerized may be used as a mixture or, if necessary, dividedly. Further, the method for adding the monomer mixture is not particularly limited, and the whole amount may be charged at once or may be added sequentially.

As the radical initiator, known initiators such as a thermal decomposition initiator such as potassium persulfate and a redox initiator such as Fe-reducing agent-organic peroxide can be used. In addition, a polymerization accelerator, a polymerization degree regulator, and an emulsifier can be appropriately selected and used. The polymerization temperature is 30 to 9
0 ° C. is preferred.

The blend ratio of the graft copolymer (A) and the vinyl copolymer (B) in the resin composition constituting the lamp body of the present invention is appropriately determined in order to obtain desired physical properties. What is necessary is that the graft copolymer (A)
Is 100 to 10 parts by weight, preferably 60 to 10 parts by weight,
The amount of the vinyl copolymer (B) is 0 to 90 parts by weight, preferably 40 to 90 parts by weight. It is also possible to polymerize the vinyl copolymer (B) in the same reactor after polymerizing the graft copolymer (A).

The limiting viscosity of the resin composition (C) containing the graft copolymer (A) and the vinyl copolymer (B) as main components is 0.25 to 1.
5 (dl / g) (N, N-dimethylformamide solution,
30 ° C.) is preferred.

The method for obtaining the resin composition (C) from the latex of the graft copolymer (A) or the vinyl copolymer (B) may be a known method. For example, inorganic salts such as calcium chloride, magnesium chloride and ammonium sulfate, hydrochloric acid,
It is obtained by coagulation with acids such as sulfuric acid, phosphoric acid and acetic acid. If necessary, when blending with a resin, use a general method, for example, a blender such as a Henschel mixer or a ribbon blender to obtain a desired stabilizer, antioxidant, ultraviolet absorber, lubricant, antistatic agent, pigment. Inorganic fillers and glass fibers can be used as needed. In particular, phenol-based, sulfur-based, phosphorus-based or hindered amine-based stabilizers, antioxidants, benzophenone- or benzotriazole-based ultraviolet absorbers and organopolysiloxanes used in styrene-based resins, ethylenebisstearic acid amide, aliphatic Lubricants such as hydrocarbons, esters of higher fatty acids and higher alcohols and the like can be used as molding resins for higher performance. These stabilizers and lubricants can be used alone or in combination of two or more.

In addition, the resin composition (C) constituting the lamp body includes, in addition to the graft copolymer (A) and the vinyl copolymer (B), a conventional ABS resin, AS resin, polycarbonate resin, It can be used by blending with a polyvinyl chloride resin, a polyamide resin, a PET resin, or a PBT resin.

In the present invention, a homopolymer of methacrylic ester or a monomer containing methacrylic ester as a main component is added to a rubber-reinforced styrene resin such as the resin composition (C) as described above. A heated hot plate is pressed against a lamp body formed by molding the resin composition and melted, and then the fused portion is pressed against a lamp lens to join the lamp body and the lamp lens to produce a vehicle lamp. The temperature of the hot plate in the above case is preferably heated to 250 to 500 ° C. Further, it is preferable to use a lens made of methyl methacrylate resin as the lamp lens to be joined to the lamp body.

[0026]

The present invention will be described below in more detail with reference to examples, but these examples do not limit the present invention in any way. In the description of the examples, unless otherwise noted.
"Parts" represents parts by weight, and "%" represents% by weight. Each abbreviation in the examples has the following meaning.

PBd: polybutadiene average particle size:
0.2 μm SBR: (styrene / butadiene rubber = 25/75) copolymer Average particle diameter: 0.1 μm PBA: (butyl acrylate / allyl methacrylate = 99/1) copolymer Average particle diameter: 0.15 μm GMA: Glycidyl methacrylate AN: Acrylonitrile St: Styrene MMA: Methyl methacrylate PMI: Phenylmaleimide CHP: Cumene hydroperoxide tDM: t-Dodecyl mercaptan αMSt: α-methylstyrene

Examples 1 to 6 and Comparative Examples 1 and 2 (a) Production of graft copolymer (A) In a reactor equipped with a stirrer, a reflux condenser, a nitrogen inlet, a monomer inlet, and a thermometer. The following substances were charged. Pure water 250 parts Rubbery polymer Listed in Table 1 Sodium formaldehyde sulfoxylate 0.3 parts Ferrous sulfate 0.0025 parts Disodium ethylenediaminetetraacetate 0.01 parts

The reactor was stirred at 60 ° C. under a nitrogen stream.
Temperature. After the temperature reached 60 ° C., the monomer mixture shown in Table 1 was continuously added dropwise over 5 hours, and after the addition was completed, stirring was further continued at 60 ° C. for 1 hour to complete the polymerization to obtain A1 to A5. .

[0030]

[Table 1]

(B) Production of vinyl copolymer (B) The following substances were charged into a reactor equipped with a stirrer, a reflux condenser, a nitrogen inlet, a monomer inlet, and a thermometer. Pure water 250 parts Sodium laurate 3 parts Sodium formaldehyde sulfoxylate 0.4 parts Ferrous sulfate 0.0025 parts Disodium ethylenediaminetetraacetate 0.01 parts

The reactor was stirred at 60 ° C. under a nitrogen stream.
Temperature. After reaching 60 ° C., the monomers (I) shown in Table 2 were charged. After sufficient emulsification, the monomers (II) shown in Table 2 were continuously added dropwise over 6 hours. After completion of the addition, stirring was continued at 60 ° C. for 1 hour to complete the polymerization, thereby obtaining B1 to B4.

[0033]

[Table 2]

(C) Production of resin composition (C) The graft copolymer (A) and vinyl copolymer (B) produced in the above (a) and (b) are shown in Table 3 in the form of latex, respectively. After mixing at an adjusted ratio (solid content), adding an antioxidant to the mixed latex and coagulating with calcium chloride, heating, dehydrating, washing with water and drying, and then a resin composition (C) powder (C1 to C8) I got

[0035]

[Table 3]

(D) Low molecular weight methacrylate copolymer A commercially available polymethacrylic resin was purchased and used (LG
6: Sumitomo Chemical Co., Ltd.). 230 ℃ of this one,
Melt flow rate at 3.8 kg load (JIS7
210) was 20 g / 10 min.

(E) Production of resin composition for lamp body for vehicle lighting and evaluation of stringiness The resin composition (C) was added with a phenolic antioxidant 0.3.
Part (AO-20: manufactured by Asahi Denka Kogyo Co., Ltd.), 0.3 part of phosphorus-based stabilizer (PEP-24G: manufactured by Asahi Denka Kogyo Co., Ltd.),
A lubricant EBS 1.0 part (ethylene bisstearic acid amide, manufactured by NOF Corporation) was used as a common additive,
Low molecular weight methacrylate copolymer: LG6 was blended as shown in Table 4, and pellets were obtained at 250 ° C. with an extruder (40 mmφ single screw extruder: manufactured by Osaka Seiki Co., Ltd.). The obtained pellets were subjected to AST at 250 ° C. using a 150-ton injection molding machine (manufactured by FANUC).
M No. 1 dumbbell and the lamp body product shown in FIG. 1 were molded and used to evaluate the stringiness.

(A) Evaluation of stringiness using a dumbbell test piece The ASTM No. 1 dumbbell obtained by injection molding was left immediately after molding under the following conditions. Conditions: Left for one week in a constant temperature room at 23 ° C. and 50% relative humidity. Conditions: 5 ° C, relative humidity 15 assuming low humidity in winter
% For 1 week.

Using this test piece, the plate was pressed against an aluminum flat plate heated to 350 ° C. at a pressure of 10 kgf / cm ² for 10 seconds.
The length (cm) of the yarn generated on the melted surface when pulled up at a speed of min was measured. Table 4 shows the results.

(B) Evaluation of stringiness using a lamp body product The lamp body product shown in FIG. 1 obtained by injection molding was left immediately after molding under the following conditions. Conditions: Left for one week in a constant temperature room at 23 ° C. and 50% relative humidity. Conditions: 5 ° C, relative humidity 15 assuming low humidity in winter
% For 1 week.

This product was pressed against a hot plate made of aluminum at a fusion temperature of 350 ° C. and a pressure of 10 kgf / cm ² for 10 seconds using a hot plate fusion machine, and then pulled up at a speed of 50 mm / min. It was determined whether stringing occurred on the wearing surface. Table 4 shows the results. In addition, the evaluation of stringiness by a lamp body product was based on the following criteria. 〇: No stringiness. Δ: Slight stringiness. X: There is stringiness.

[0042]

[Table 4]

As is clear from the results shown in Table 4, according to the present invention, the lamp body made of the ABS resin composition of the comparative example which has been conventionally used was used even when the lamp body was conditioned under low humidity. Compared with the case, the stringiness in the hot plate fusion method is greatly improved.

[0044]

According to the present invention, by using a rubber-reinforced styrene resin obtained by blending a homopolymer of methacrylate or a copolymer of a monomer component containing methacrylate as a main component, Compared to the case of using a general rubber-reinforced styrene resin conventionally used as a material for the lamp body, for example, in a low humidity environment such as winter, a heated hot plate is pressed against the lamp body and melted. After that, when the molten portion is pressed against the lamp lens and the lamp body and the lamp lens are joined to manufacture a lamp for a vehicle, stringing of the resin constituting the lamp body can be significantly improved, It is particularly useful for manufacturing vehicle lamps such as headlamps, turn signals, and stop lamps.

[Brief description of the drawings]

FIG. 1 is a sectional view of a lamp body product used for evaluating stringiness.

Claims (11)

[Claims] 1. A heated lamp is pressed against a lamp body made of a rubber-reinforced styrene-based resin and melted, and then the fused portion is pressed against a lamp lens to join the lamp body and the lamp lens to form a vehicle lamp. A methacrylic acid ester homopolymer or a copolymer of a monomer component containing a methacrylic acid ester as a main component in an amount of 3 to 30% with respect to 97 to 70% by weight of a rubber-reinforced styrene resin used for a lamp body for production. A resin for a lamp body for a vehicle lighting fixture, which is blended with the weight%. 2. The rubber-reinforced styrenic resin is graft-polymerized so that a total of 100 parts by weight of 15 to 95 parts by weight of a rubbery polymer is combined with 85 to 5 parts by weight of a monomer mixture. Monomer mixture, a vinyl cyanide compound,
99.9 to 60% by weight of at least one vinyl compound selected from the group consisting of an aromatic vinyl compound and an alkyl (meth) acrylate compound; 0 to 30% by weight of another copolymerizable vinyl compound; -100 to 10 parts by weight of a graft copolymer (A) composed of 0.1 to 40% by weight of a glycidyl ester compound of an unsaturated acid, 10 to 40% by weight of a vinyl cyanide compound, and 60 to 90% by weight of an aromatic vinyl compound And a resin composition comprising 100 parts by weight of a total of 0 to 90 parts by weight of a vinyl copolymer (B) obtained by polymerizing 0 to 30% by weight of another copolymerizable vinyl compound. The resin for a lamp body for a vehicle lighting device according to claim 1, which is a resin composition (C). 3. The monomer mixture of the graft copolymer (A) contains 0 to 40% by weight of a vinyl cyanide compound, 60 to 90% by weight of an aromatic vinyl compound, and alkyl (meth).
99.9 to 60% by weight of a vinyl compound comprising 0 to 30% by weight of an acrylate compound, 0 to 30% by weight of another copolymerizable vinyl compound and 0.1 to 30% by weight of a glycidyl ester compound of an α, β-unsaturated acid 3. The resin for a lamp body for a vehicle lamp according to claim 2, comprising 40% by weight. 4. The vehicle according to claim 2, wherein the content of the glycidyl ester compound of the α, β-unsaturated acid in the monomer mixture of the graft copolymer (A) is 5 to 20% by weight. Resin for lamp body for lamp. 5. The glycidyl ester compound of an α, β-unsaturated acid is at least one selected from the group consisting of glycidyl acrylate, glycidyl methacrylate, and glycidyl ethacrylate.
The resin for a lamp body for a vehicle lamp according to the above. 6. The methacrylic acid ester homopolymer or the copolymer of a monomer component containing methacrylic acid ester as a main component is a methacrylic acid ester monomer 100.
~ 80% by weight and other copolymerizable monomers
20 wt%, and its melt flow rate (230 ° C., 3.8 kg load) is 15 g / 10 min or more 1
The resin for a lamp body for a vehicle lamp according to claim 2, wherein the resin is not more than 00 g / 10 minutes. 7. A heated hot plate is pressed against a lamp body obtained by molding the resin for a lamp body for a vehicle lamp according to claim 1, and is melted.
A method for manufacturing a vehicular lamp, comprising: bonding a lamp body and a lamp lens by pressing a molten portion onto a lamp lens. 8. The method for manufacturing a vehicular lamp according to claim 7, wherein the heating is performed by heating the hot plate to 250 to 500 ° C. 9. A lens made of a methyl methacrylate resin as the lamp lens.
The manufacturing method of the vehicle lighting device according to the above. 10. A heated hot plate is pressed against a lamp body formed by molding the resin for a lamp body for a vehicle lamp according to claim 1, and then melted. A vehicular lamp in which a part is crimped to a lamp lens to join the lamp body and the lamp lens. 11. A lamp lens comprising a lens made of methyl methacrylate resin.
The vehicle lighting device as described in the above.