JP2007161863A - Photocurable coating material for polyamide - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a photocurable coating material manifesting excellent adhesiveness to a polyamide; a metal-deposited polyamide molding obtained from it; and a reflector plate used for a light emitting diode element and obtained by using it. <P>SOLUTION: The photocurable coating material for a polyamide comprises 10-90 pts.wt. of an acrylic polymer (P) containing hydroxyl groups with a hydroxyl value of 1-200 mg KOH/g and having a molecular weight of 1,000-100,000, 10-90 pts.wt. of a radically polymerizable compound (M), and a photoinitiator (C) in an amount of 0.1-15 pts.wt. based on 100 pts.wt. of the sum of (P) and (M). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

 The present invention relates to a photocurable coating that can be cured by ultraviolet rays, electron beams, radiation, and the like. More specifically, the present invention relates to a photo-curable paint that exhibits excellent adhesion to polyamide, a metal-deposited polyamide molded product obtained thereby, and a light-emitting diode element reflector using the same.

 When metal vapor deposition is performed on nylon, which is an aliphatic polyamide, or on an aromatic polyamide plastic material, there is a problem that a clean metal vapor deposition surface cannot be obtained because the surface is not smooth. Usually, when metal vapor deposition is performed on a plastic material, a paint is applied to smooth the surface, and metal vapor deposition is performed thereon. For example, various plastic moldings such as acrylonitrile-butadiene-styrene copolymer (ABS) resin, polycarbonate (PC) resin, polyethylene terephthalate (PET) resin, polybutylene terephthalate (PBT) resin, fiber reinforced composite material (FRP), etc. In the case where a metal such as aluminum is vacuum-deposited on the surface, a thermosetting or two-component mixed curing type paint using urethane resin, acrylic resin, polyester resin or the like has been used as the undercoat paint. On the other hand, ultraviolet curable coatings are known as coatings that are extremely excellent in productivity and energy saving because they are cured by light and do not require heating and can be cured in a few seconds. However, when conventional UV curable coatings are applied to polyamide, there is a problem that the adhesiveness is poor and cannot be used.

An example of an application in which polyamide is used is a light emitting diode package. In this application, since the package is required to have a function of reflecting light, at present, the white pigment is kneaded to make the polyamide white, and the function is given. However, if metal deposition can be performed on polyamide, the reflection function is remarkably improved. Patent Documents 1 and 2 disclose an undercoat agent for ultraviolet curable paint in the case of metal deposition on a plastic substrate, particularly a polypropylene substrate. In this disclosure, an acrylic resin comprising at least a monomer selected from dicyclopentanyl (meth) acrylate, dicyclopentenyl (meth) acrylate, and isoboronyl (meth) acrylate, and a (meth) acryloyl group in the molecule. A paint comprising a compound having a photoinitiator is disclosed. In addition, it has been described that adhesion to PC, PET, PBT, ABS, AS (acrylonitrile-styrene copolymer) and PPO (polyphenylene oxide) is expressed. When applied above, the adhesion was insufficient.
JP 2002-347175 A JP 2002-348498 A

 In light of the above-mentioned present situation, the present invention provides a photo-curable coating material that exhibits excellent adhesion to polyamide, a metal-deposited polyamide molding obtained thereby, and a light-emitting diode element reflector using the same The purpose is to provide.

 As a result of intensive studies to solve the above problems, the present inventors have completed the present invention. That is, the present invention comprises 10 to 90 parts by weight of an acrylic polymer (P) having a hydroxyl value of 1 to 200 mg KOH / g and a molecular weight of 1,000 to 100,000, and a radical polymerizable compound (M). 10 to 90 parts by weight and 0.1 to 15 parts by weight of photoinitiator (C) for 100 parts by weight of total of (P) and (M) A polyamide molding obtained by applying the coating material and the photo-curable coating material for polyamide of the present invention onto a polyamide base material, curing the coating material by irradiating the coating material with ultraviolet rays, and then performing metal deposition. Further, the present invention is a light-emitting diode element reflector using the metal-deposited polyamide molded body of the present invention.

 According to the present invention, a coating film exhibiting excellent adhesion to polyamide can be obtained by ultraviolet curing with high productivity and energy saving. Furthermore, after applying the photocurable coating material of the present invention, it is possible to perform metal vapor deposition, which can be suitably used for applications such as light-emitting diode element reflectors.

The present invention will be described in detail below.

<< Acrylic polymer (P) >>
In order that the acrylic polymer (P) in the present invention exhibits excellent adhesion, at least one monomer selected from an acrylic ester and a methacrylic ester is used as the acrylic polymer (P). It is an acrylic polymer polymerized by containing 50% by weight or more. The acrylic polymer (P) of the present invention can be obtained by copolymerizing a monomer (a) containing a hydroxyl group and another monomer (b). Examples of the monomer (a) containing a hydroxyl group include hydroxyl group-containing vinyls such as 2-hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, and 4-hydroxybutyl (meth) acrylate. Here, description like methyl (meth) acrylate shows methyl acrylate and / or methyl methacrylate, and the following (meth) has the same meaning.

 Examples of the other monomer (b) include methyl (meth) acrylate, ethyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, t-butyl (meth) acrylate, n -Amyl (meth) acrylate, isoamyl (meth) acrylate, n-hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, octyl (meth) acrylate, decyl (meth) acrylate, dodecyl (meth) acrylate, octadecyl (meth) ) Acrylate, cyclohexyl (meth) acrylate, phenyl (meth) acrylate, benzyl (meth) acrylate, isobornyl (meth) acrylate, dicyclopentanylmeth) acrylate, dicyclopentenyl (meth) acrylate, Alkyl (meth) acrylates such as cyclopentenyloxyethyl (meth) acrylate; aromatic hydrocarbons such as styrene, 2-methylstyrene, t-butylstyrene, chlorostyrene, vinylanisole, vinylnaphthalene, divinylbenzene; acrylic Unsaturated carboxylic acids such as acid, methacrylic acid, itaconic acid, maleic acid, fumaric acid, and anhydrides thereof; acrylamide, methacrylamide, N-methylol methacrylamide, N-methylol acrylamide, diacetone acrylamide, maleic amide, etc. Amides; vinyl esters such as vinyl acetate and vinyl propionate; vinylidene halides such as vinylidene chloride and vinylidene fluoride; N, N-dimethylaminoethyl (meth) acrylate, N, N-diethylamino Chill (methacrylate, N, N-dimethylaminopropyl (meth) acrylate, N, N-dipropylaminoethyl (meth) acrylate, N, N-dibutylaminoethyl (meth) acrylate, N, N-dihydroxyethylaminoethyl Aminoalkyl (meth) acrylates such as (meth) acrylate; Unsaturated sulfonic acids such as styrene sulfonic acid, sodium styrene sulfonate, 2-acrylamido-2-methylpropane sulfonic acid; mono (2-methacryloyloxyethyl) acid Unsaturated phosphoric acids such as phosphate and mono (2-acryloyloxyethyl) acid phosphate; 2-methoxyethyl acrylate, 2-ethoxyethyl acrylate, glycidyl acrylate, glycidyl methacrylate, allyl glycidyl ether , Acrylonitrile, methacrylonitrile, vinyl chloride, ethylene, propylene, isoprene, butadiene, chloroprene, vinyl pyrrolidone, 1,2,2,6,6-pentamethyl-4-piperidyl (meth) acrylate, 2,2,6,6 -Tetramethyl-4-piperidyl (meth) acrylate, 2- (2'-hydroxy-5'-methacryloyloxyethylphenyl) -2H-benzotriazole and the like.

Among these, as other monomer (b), in order to obtain good adhesion, the carbon number of alkyl such as methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, etc. is 4 or less. The alkyl (meth) acrylates are preferably used.
The acrylic polymer (P) in the present invention usually contains a hydroxyl group having a hydroxyl value of 1 to 200 mgKOH / g, preferably 10 to 180 mgKOH / g, more preferably 20 to 160 mgKOH, in order to develop adhesion. / G hydroxyl group.
In addition, the molecular weight of the acrylic polymer (P) in the present invention is usually 1,000 to in order to develop good coating film adhesion, and to make the viscosity of the coating composition within a paintable range. 100,000, preferably 3,000-60,000, more preferably 5,000-30,000.

<< Radically polymerizable compound (M) >>
The radical polymerizable compound (M) in the present invention is a compound having an acrylic group. For example, ethylhexyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate, isobornyl (meth) acrylate, dipropylene glycol (meth) acrylate, ethoxydiethylene glycol (meth) acrylate, hydroxyethyl (meth) acrylate, 2- Hydroxypropyl (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, dicyclopentenyl (meth) acrylate, neopentyl glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, 1,9-nonane Diol di (meth) acrylate, dimethylol tricyclodecane di (meth) acrylate, hydroxypivalic acid neopentyl glycol di (meth) acrylate, neopen Diglycol-modified trimethylolpropane di (meth) acrylate, tripropylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, bis ((meth) acryloxyethyl) bisphenol A, tri Methylolpropane tri (meth) acrylate, ethylene oxide modified trimethylolpropane ditri (meth) acrylate, propylene oxide modified trimethylolpropane tri (meth) acrylate, glycerol tri (meth) acrylate, ethylene oxide modified glycerol tri (meth) acrylate, propylene Oxide-modified glycerin tri (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, pentaerythrine Lithol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol hexa (meth) acrylate, dipentaerythritol penta (meth) acrylate, part of these (meth) acrylates substituted with alkyl groups or ε-caprolactone Examples thereof include polyfunctional (meth) acrylate, acryloylmorpholine having an active double bond, triethylene glycol divinyl ether, hydroxyethyl divinyl ether, styrene, divinylbenzene and the like.

 Furthermore, polyester poly (meth) acrylates obtained by reaction of polybasic acids such as phthalic acid and adipic acid, polyhydric alcohols such as ethylene glycol and butadiol, and (meth) acrylic acid compounds; epoxy resins and (meth ) Epoxy poly (meth) acrylate obtained by reaction with acrylic acid compound; Polysiloxane poly (meth) acrylate obtained by reaction of polysiloxane and (meth) acrylic acid compound; Polyamide and (meth) acrylic acid compound Examples thereof include polyamide poly (meth) acrylate obtained by the reaction.

In the present invention, one or more radical polymerizable compounds (M) are applied in accordance with the desired hardness of the coating film, but urethane acrylate (U), trimethylolpropane tri (meth) acrylate, pentaerythritol tri ( (Meth) acrylate, pentaerythritol tetra (meth) acrylate, neopentyl glycol di (meth) acrylate, ethylene oxide modified trimethylolpropane ditri (meth) acrylate, tripropylene glycol di (meth) acrylate, dipentaerythritol penta (meth) acrylate Dipentaerythritol hexa (meth) acrylate is preferably used.
Among these, in order to obtain a coating film having particularly excellent hardness, it is preferable to contain urethane acrylate (U) having an acrylic group in the urethane resin as the radical polymerizable compound (M). The amount is usually 1 to 100 parts by weight, preferably 50 to 100 parts by weight, and more preferably 70 to 100 parts by weight with respect to 100 parts by weight of the radical polymerizable compound (M).

Urethane acrylate (U) is synthesized by polymerization by addition reaction of a diisocyanate compound and a glycol species, and further adding (meth) acrylate having an active hydrogen group such as a hydroxyl group to the remaining isocyanate group. Examples of the diisocyanate compound include hexamethylene diisocyanate (HDI), 1,3-diisocyanatomethylcyclohexane (H ₆ XDI), isophorone diisocyanate (IPDI), and toluene diisocyanate (TDI). Of these, HDI, H ₆ XDI, and IPDI are preferred.

 Examples of the glycol species include polyester polyols such as pivalic acid neopentyl glycol ester and polycaprolactone polyol; polyether polyols such as polyethylene glycol, polypropylene glycol and polytetramethylene ether glycol; polycarbonate polyols such as polyhexamethylene carbonate glycol; Ethylene glycol, propanediol, 1,4-butylene glycol, 1,3-butylene glycol, 1,2-butylene glycol, 1,6-hexanediol, methylpentanediol, neopentylglycol, 3,3-dimethylolheptane, Alkanediol having 7 to 22 carbon atoms, diethylene glycol, triethylene glycol, dipropylene glycol, cyclohexane dimeta Alcohol, alkane-1,2-diol having 17 to 20 carbon atoms, hydrogenated bisphenol A, 1,4-dihydroxy-2-butene, 2,6-dimethyl-1-octene-3,8-diol, bisphenol A, glycerin, 2-methyl-2-hydroxymethyl-1,3-propanediol, 2,4-dihydroxy-3-hydroxymethylpentane, 1,2,6-hexanetriol, 1,1,1-tris (hydroxy Methyl) propane, 2,2-bis (hydroxymethyl) -3-butanol, other aliphatic triols having 8 to 24 carbon atoms, tetramethylolmethane, D-sorbitol, xylitol, D-mannitol, D-mannitol, etc. It is. Among these, polyester polyols such as polycaprolactone polyol and polyether polyols such as polytetramethylene ether glycol are preferable.

 Furthermore, examples of (meth) acrylates having active hydrogen groups such as hydroxyl groups include hydroxyl group-containing vinyls such as 2-hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, and 4-hydroxybutyl (meth) acrylate. Can be mentioned.

  The ratio of the acrylic polymer (P) and the radical polymerizable compound (M) of the present invention is usually 10 to 90 parts by weight of the acrylic polymer (P) in order to express excellent adhesion to the polyamide, radical polymerization. 10-90 parts by weight of the compound (M), preferably 15-90 parts by weight of (P), 10-85 parts by weight of (M), more preferably 20-90 parts by weight of (P), 80 parts by weight.

<< Photoinitiator (C) >>
The photoinitiator (C) of the present invention is a compound capable of generating radicals by ultraviolet rays, electron beams, radiation, etc., and specific examples thereof include benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether. , Benzoin isobutyl ether, acetoin, butyroin, toluoin, benzyl, benzophenone, p-methoxybenzophenone, diethoxyacetophenone, 2,2-dimethoxy-2-phenylacetophenone, methylphenylglyoxylate, ethylphenylglyoxylate, 4,4 -Bis (dimethylaminobenzophenone), 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 1- (4-isopropylphenyl) -2-hydroxy- Carbonyl compounds such as methylpropan-1-one; sulfur compounds such as tetramethylthiuram disulfide; azo compounds such as azobisisobutyronitrile and azobis-2,4-dimethylvaleronitrile; anthraquinones such as 2-ethylanthraquinone Peroxide compounds such as benzoyl peroxide and ditertiary butyl peroxide; acyls such as 2,4,6-trimethylbenzoyldiphenylphosphine oxide and bis (2,6-dimethoxybenzoyl) -2,4,4-trimethylpentylphosphine oxide A phosphine oxide compound can be mentioned.

 Examples of preferred initiators include benzophenone, methylphenylglyoxylate, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2,4,6-trimethylbenzoyldiphenylphosphine These are oxides, and these may be used alone or in combination of two or more.

 The ratio of the photoinitiator (C) is usually 0.1 to 15 parts by weight, preferably 1 to 10 parts by weight, more preferably 100 parts by weight of the total of (P) and (M). 1 to 8 parts by weight. In the photocurable resin composition of the present invention, an organic solvent, a polymerization inhibitor, an ultraviolet absorber, a light stabilizer, an antioxidant, an anti-yellowing agent, a dye, a pigment, a leveling agent, an antifoaming agent, a thickener, Various additives such as an anti-settling agent, an antistatic agent, an antifogging agent, an anti-fogging agent, a wetting agent, a dispersing agent, an anti-dripping agent, and a coupling agent can be contained.

《Coating method》
There is no limitation on the method of applying such a photocurable coating composition to a substrate, and it is carried out by a conventional method such as brush coating, spray coating, dip coating, spin coating or curtain coating. In order to exhibit sufficient hardness and good adhesion without generating cracks in the coating, it is preferable that the coating thickness is 3 to 30 μm as the coating amount.

《Curing method》
As a means for curing the coating film applied to the substrate, a known method of irradiating active energy rays such as ultraviolet rays, electron beams, and radiations can be used. To UV lamps are generally used. Specific examples include a low-pressure mercury lamp, a high-pressure mercury lamp, an ultrahigh-pressure mercury lamp, a xenon lamp, a gallium lamp, a metal halide lamp, and ultraviolet rays such as sunlight. The irradiation atmosphere may be air or an inert gas such as nitrogen or argon.

《Deposition》
Metal vapor deposition is performed using methods such as vapor deposition, sputtering, ion plating, and plating, but vacuum vapor deposition is more preferable from the viewpoint of productivity. Examples of the metal to be deposited include Al, Zn, Cu, Ag, Au, Sn, Ni, and alloys thereof. In particular, Al is a preferable metal because of its good durability and Ag has a high reflectance.

"polyamide"
The polyamide used as the base material is a resin synthesized from polyvalent amines and polybasic acids, and includes an aliphatic polyamide generally called nylon. Examples of the polyvalent amine include 1,9-diaminononane, 1,6-diaminohexane, 1,7-diaminoheptane, 1,8-diaminooctane, 1,9-diaminononane, 1,10-diaminodecane, 1, 11-diaminoundecane, 1,12-diaminododecane, 2-methyl-1,5-diaminopentane, 2-methyl-1,6-diaminohexane, 2-methyl-1,7-diaminoheptane, 2-methyl-1 , 8-diaminooctane, 2-methyl-1,9-diaminononane, 2-methyl-1,10-diaminodecane, 2-methyl-1,11-diaminoundecane and the like.

 Examples of polybasic acids include terephthalic acid, adipic acid, tetraphthalic acid, phthalic acid, maleic acid, sebacic acid, isophthalic acid, dimethyl terephthalate, tetrahydrophthalic acid, hexahydrophthalic acid, trimellitic acid, pyromellitic acid, Examples include 2-methyl terephthalic acid, naphthalenedicarboxylic acid, suberic acid, azelaic acid, decanedicarboxylic acid, undecanedicarboxylic acid, and dodecanedicarboxylic acid. Further, the polyamide may contain an inorganic filler. Examples of the inorganic filler include inorganic fillers such as titanium oxide, zinc oxide, alumina, silica, barium titanate, calcium phosphate, calcium carbonate, white carbon, talc, magnesium carbonate, boron nitride, and glass fiber. When these are used, it is appropriate that 10 to 80 parts by weight, preferably 40 to 80 parts by weight, of inorganic fillers are added to 100 parts by weight of the resin. Furthermore, additives such as an antioxidant, a heat stabilizer, and a light stabilizer may be added as appropriate. The polyamide may be a sheet-shaped molded product, a film-shaped molded product, or a molded product of various shapes, and various injection-molded products obtained by heat molding such as injection molding, melt molding, extrusion molding, inflation molding, and blow molding. It may be.

<Reflector for light-emitting diode element>
The term “reflector for light-emitting diode element” used in the specification of the present application uses the Chinese character “plate”, but the concept of this term is limited to that having a “plate” -like shape. It is not limited, and includes a casing or a housing in which at least a light emitting direction is released or not released, and more specifically, a box-like or box-like shape, a funnel-like shape , Having a bowl shape, having a parabolic shape, having a cylindrical shape, having a conical shape, having a honeycomb shape, etc. In general, a three-dimensional shape having a surface such as a spherical surface or a curved surface as a light reflecting surface is also included. In the present invention, the light-emitting diode element reflector is usually made of a polyamide resin or a resin composition containing a polyamide resin and an inorganic filler by injection molding, melt molding, extrusion molding, inflation molding, blow molding, or the like. It is shaped into a desired shape by thermoforming.
With the photocurable resin composition of the present invention, it is possible to obtain an ultraviolet curable coating material that exhibits excellent adhesion to polyamide and has high productivity and energy saving. Furthermore, after applying the photocurable coating composition of the present invention, it is possible to perform metal vapor deposition, which can be suitably used for applications such as a reflector for a light emitting diode element.

  Examples of the present invention will be described below, but the present invention is not limited to these examples.

[Example 1]
In a reaction vessel charged with 85 g of toluene and 37 g of n-butanol, a mixed solution of 85 g of methyl methacrylate (MMA), 14 g of 2-hydroxyethyl methacrylate (HEMA), 1 g of methacrylic acid (MAA), and 1 g of azobisisobutyronitrile. The solution was added dropwise at 100 ° C. for 4 hours under an air stream. Furthermore, in order to maintain 100 degreeC and to complete polymerization, 0.2 g of azobisisobutyronitrile was added twice every hour. The mixture was cooled 3 hours after the completion of the dropping to obtain an acrylic polymer (P) solution having a nonvolatile content of 45% and a weight average molecular weight of 25,000. Furthermore, this polymer solution 222 g (100 g of polymer) was mixed with 100 g of olestar RA1574 (manufactured by Mitsui Chemicals: urethane acrylate) and 6 g of Irgacure 184 (photoinitiator manufactured by Ciba Specialty) to produce a photocurable coating composition. Got.

[Examples 2 to 9]
The type and mixing ratio of the monomer species constituting the acrylic polymer (P) and the radical polymerizable compound (M) were changed as shown in Table 1, and the photo-curable paint was prepared in the same manner as in Example 1. A composition was obtained. Moreover, in order to change molecular weight about Example 7 and Example 8, the amount of azobisisobutyronitrile was 5 g in Example 7, and 0.2 g in Example 8.

[Comparative Examples 1-5]
The monomer species constituting the polymer (P) and the type and mixing ratio of the radical polymerizable compound (M) were changed as shown in Table 2, and the operations of Comparative Examples 1 to 5 were carried out in the same manner as in Example 1. A photocurable coating composition was obtained.

[Evaluation methods]
The photocurable coating composition obtained above was tested by the method shown below. The results are shown in Table 2.
<Measurement of molecular weight>
The molecular weight of the acrylic polymer (P) was measured with a RI detector using GPC (Shodex GPC SYSTEM-11: Showa Denko).
<Measurement of hydroxyl value>
The hydroxyl value was evaluated according to JIS K0070.
<Ultraviolet curing conditions>
On a molded plate of polyamide (Aalen A335: manufactured by Mitsui Chemicals Co., Ltd.), 10 μm of the photocurable coating composition was applied with an applicator, dried at 60 ° C. × 1 min, and then irradiated with ultraviolet rays having three 100 w / cm high-pressure mercury lamps. The apparatus was irradiated with ultraviolet rays at an irradiation distance of 10 cm and a line speed of 10 m / min. The test piece thus obtained was subjected to subsequent tests.
<Adhesion>
The adhesion was evaluated by a cross cut test (JIS K5600-5-6).
<Adhesion after water resistance>
After the ultraviolet-cured specimen was immersed in warm water at 60 ° C. for 24 hours, the adhesion was evaluated by a cross-cut test (JIS K5600-5-6).
<Metal vapor deposition>
The test piece cured with ultraviolet rays was subjected to aluminum deposition at a thickness of 1000 mm, and the appearance of the surface was visually evaluated. A metal-like mirror surface state was rated as ◯, the vapor deposition surface was slightly white and turbid, but practically acceptable Δ, and the vapor deposition surface was cloudy and the mirror surface state was impaired as ×.

[Evaluation results]
The evaluation results are shown in Tables 1 and 2.

MMA: Methyl methacrylate ST: Styrene HEAM: 2-Hydroxyethyl methacrylate BA: n-Butyl acrylate MAc: Methacrylic acid IBX: Isoboronyl methacrylate RA1574: (Olester RA1574 (urethane acrylate) manufactured by Mitsui Chemicals, Inc.)
PE-3A: Pentaerythritol triacrylate NPG-A: Neopentyl glycol diacrylate

The present invention is a UV curable coating material that is highly productive and energy-saving, and has good adhesion on a polyamide molded body. Therefore, the present invention is applied to automobile parts, electrical / electronic parts, and machine parts that use polyamide. It can be suitably used, and is also suitable as an undercoating paint for metal vapor deposition. Furthermore, a polyamide molded body on which metal vapor deposition has been performed can be suitably used as a reflector.

Claims (3)

10 to 90 parts by weight of an acrylic polymer (P) having a hydroxyl value of 1 to 200 mg KOH / g and a molecular weight of 1,000 to 100,000, and 10 to 90 parts by weight of a radical polymerizable compound (M) And 0.1 to 15 parts by weight of a photoinitiator (C) with respect to 100 parts by weight of the total of (P) and (M). A polyamide molded body obtained by applying the photocurable coating material for polyamide according to claim 1 on a polyamide base material, curing the coating material by irradiating it with ultraviolet rays, and then performing metal vapor deposition. . A reflector for a light emitting diode element, wherein the metal-deposited polyamide molded body according to claim 2 is used.