KR20100103012A - Diffusive illuminating cover for led and led illuminating lamp comprising the same - Google Patents

Abstract

PURPOSE: A light diffusive-transmissive unit for a light emitting diode(LED) and an LED lamp including the same are provided to obtain a permanent anti-static effect using a resin, an anti-static agent, and a fluorescent whitening agent in specific contents. CONSTITUTION: An LED illuminating lamp(110) includes a light-transmissive unit(111) and a heat sink(112). An LED module(120) includes an LED element(121) and a substrate(122). The light-transmissive unit is installed on the front side of the LED element in order to transmit light from the LED element. A single layered or multi-layered intensity improvement layer is formed on the inner side of the transmissive unit.

Description

Diffuse translucent member for LED and LED lighting lamp including the same {DIFFUSIVE ILLUMINATING COVER FOR LED and LED ILLUMINATING LAMP COMPRISING THE SAME}

The present invention relates to a diffused light transmitting member for LEDs including an antistatic agent and a fluorescent brightening agent in a specific content and to prevent adhesion of foreign substances such as dust and yellowing at the same time, and LED lighting lamps including the same.

Recently, attention has been paid to light emitting diodes (hereinafter, abbreviated as "LED elements") including semiconductor elements as light sources of various lighting devices. These LED devices have advantages such as low heat generation and long life compared to conventional lighting such as incandescent lamps, and thus have recently been utilized in various fields as lightings for displays, general lighting devices and automotive headlights. have.

In particular, LED lamps are generally made of resin, and have a high surface resistance of about 10 ^14-16 Ω / □. Since materials having a surface resistance of 10 ¹² Ω / □ or more are electrostatically charged by friction with air, LED lighting lamps in which an air layer is present between the LED element and the light transmitting member, in particular, the light transmitting member that transmits light are likely to be electrostatic. Such static electricity attracts foreign substances such as dust, so when using the LED lamp for a long time, it is not good for aesthetics and hygiene.

In order to solve this problem, conventionally, a lamp having a low surface resistance value by applying an antistatic coating liquid on the surface of the lamp and having no dust attached by static electricity has been proposed. However, the lamp is deteriorated by the stain generated when the coating liquid is applied, the antistatic effect is a semi-permanent problem.

In addition, a resin composition including an antistatic agent having a high roughness and having a low surface resistance value has been proposed. However, the resin composition has a surface resistance value of 10 ¹³ Ω / □ or more as time passes, so that the antistatic effect is reduced, since static electricity is generated, foreign substances such as dust can be easily attached.

SUMMARY OF THE INVENTION An object of the present invention is to provide a diffused light transmissive member for LED which does not cause yellowing and has a permanent antistatic effect at the same time.

In addition, another object of the present invention is to provide an LED lamp further comprising another layer inside the light transmitting member.

A diffuse light transmitting member for LED lighting comprising a thermoplastic resin, an antistatic agent and a fluorescent brightener, the light transmitting member having a surface resistivity of 9.9 × 10 ¹⁰ Ω / □ or less and a yellowing index change value of 2.0 μs YI or less.

In addition, the present invention provides a LED lamp comprising a light transmitting member as a surface layer, and further comprising one to three intensity-improving layers inside the surface layer.

The present invention can be produced using a resin, an antistatic agent and a fluorescent brightener in a specific content, to produce a light transmitting member having both anti-yellowing and permanent antistatic effect, and at the same time can have excellent chromaticity. In addition, the light-transmitting member may be included as a surface layer, and an intensity improvement layer may be provided inside the surface layer to improve the strength and provide an LED lamp having excellent chromaticity.

The present invention relates to a diffused light transmitting member for LEDs including an antistatic agent and a fluorescent brightening agent in a specific content and to prevent adhesion of foreign substances such as dust and yellowing at the same time, and LED lighting lamps including the same.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

The present invention is a diffused light transmitting member (hereinafter referred to as a 'light transmitting member') for LED lighting comprising a thermoplastic resin, an antistatic agent and a fluorescent brightener, the surface resistivity is less than 9.9 × 10 ¹⁰ Ω / □, the yellowing index change value is 2.0 It is characterized by a light-transmitting member that is less than or equal to YI.

In addition, the light transmitting member may further include additives such as a light diffusing agent, an ultraviolet absorber, a light stabilizer, a heat stabilizer, and an antioxidant.

Hereinafter, each component contained in the translucent member of this invention is demonstrated in detail.

Thermoplastic resins can be used all of the conventional resins used in the art, in particular, excellent in transparency or translucency, light transmittance, durability, thermal stability, etc., for example, acrylic resin, styrene-acrylic copolymer resin, Resin selected from styrene resin, styrene-acrylonitrile resin, polycarbonate resin, and olefin resin can be used individually or 2 types or more.

As said acrylic resin, Methacrylic acid alkyl ester, such as methyl methacrylate, ethyl methacrylate, butyl methacrylate, and 2-ethylhexyl methacrylate; Alkyl acrylates such as methyl acrylate, ethyl acrylate and butyl acrylate; Methacrylic acid cycloalkyl esters such as cyclohexyl methacrylate, 2-methylcyclohexyl methacrylate and dicyclopentanyl methacrylate; Acrylic acid cycloalkyl esters such as cyclohexyl acrylate and 2-methylcyclohexyl acrylate; Methacrylic acid aryl esters such as phenyl methacrylate and benzyl methacrylate; And any homopolymer or copolymer thereof selected from acrylic acid aryl esters such as phenyl acrylate and benzyl acrylate.

As the styrene-acrylic copolymer resin, one or two or more selected from methacrylic acid alkyl ester, acrylic acid alkyl ester, methacrylic acid cycloalkyl ester, acrylic acid cycloalkyl ester, methacrylic acid aryl ester and acrylic acid aryl ester and styrene and one or two or more copolymers selected from α-methylstyrene, m-methylstyrene, p-methylstyrene, and p-methoxystyrene.

Examples of the styrene resins include any one homopolymer or a copolymer thereof selected from styrene, α-methylstyrene, m-methylstyrene, p-methylstyrene, and p-methoxystyrene.

As the styrene-acrylonitrile copolymer resin, one or two or more selected from styrene, α-methyl styrene, m-methyl styrene, p-methyl styrene and p-methoxy styrene and an acrylonitrile monomer Coalescence is mentioned.

The polycarbonate resin may be a linear and branched aromatic polycarbonate homopolymer, a polyester copolymer or a mixture of one or more thereof prepared by reacting dihydroxy phenol with phosgene or by reaction of dihydroxy phenol with a carbonate precursor. A group consisting of:

The olefin resin may include one or two or more copolymers selected from polyethylene, polypropylene, and polyisobutylene.

The thermoplastic resin may be included in an amount of 60 to 80% by weight, preferably 65 to 75% by weight, based on the total solids content (100% by weight) in the light-transmissive member resin composition of the present invention. At this time, when the content is less than 60% by weight, the durability of the light transmitting member is lowered, and when the content is more than 80% by weight, the content of additives such as an antistatic agent is relatively small and thus may not have excellent physical properties.

In this case, the resin composition for the light transmissive member means a composition containing a thermoplastic resin, an antistatic agent, a fluorescent brightener and an additive.

In order to exhibit antistatic performance, the antistatic agent should show a surface resistance of less than 10 ¹¹ Ω / □, and in the case of the present translucent member, it is important to form a transparent film.

As the antistatic agent, all conventional antistatic agents used in the art may be used. Specific examples thereof include water-soluble metal oxide particles, conductive polymers, surfactants, and hydrophilic monomers, and among them, permeability, antistatic properties, and Considering acidity, the use of conductive polymers and surfactants is preferred. At this time, the surfactant may be cationic surfactant, anionic surfactant, nonionic surfactant or the like.

The conductive polymer is present in a solution form, each containing a polythiophene containing 5-12 alkyl groups, a 3,4-polyethylenedioxythiophene substituted with an ethylenedioxy group at positions 3 and 4, and a polyaniline including a sulfone group. And polypyrrole containing an alkyl group having 5 to 12 carbon atoms, or a group consisting of two or more kinds thereof. In particular, 3,4-polyethylenedioxythiophene is preferable in view of transparency and thermal stability.

The cationic surfactant is dissociated in water, and the hydrophilic part exhibits a positive charge, and R is an alkyl structure of a primary amine salt (R-NH ₂ HCl), a secondary amine salt (R-NHCH ₃ HCl), and It may include the group consisting of and the like alone or in combination of two or more of ^- a tertiary amine salt _{(RN (CH 3) 2HCl)} , the quaternary amine salt _{^{(RN + (CH 3) 3Cl}} ).

The anionic surfactant is dissociated in water and the hydrophilic part exhibits a negative charge, and R is an alkyl structure of carboxylate (R-COO ^- Na ⁺ ), sulfate ester salt (R-OSO ₃ ^- Na ⁺ ), sulfonic acid salt (R-SO ₃ ^- Na ⁺ ), a phosphate ester salt (R-PO ₃ ^- Na ⁺ ) and the like or a group consisting of two or more kinds thereof may be mentioned.

The nonionic surfactant is dissolved in water by forming hydrogen bonds with water in the molecular structure without dissociation into ions, and has a polyhydric alcohol structure and a polyethylene glycol structure. Polyhydric alcohol structures include glycerin fatty acid esters, sorbitan fatty acid esters, sucrose fatty acid esters, and polyglycerol fatty acid esters, and polyethylene glycol structures include polyoxyethylene sorbitan fatty acid esters. Nonionic surfactants can be exemplified in the above-listed mixtures alone or in combination of two or more.

At this time, the content of the antistatic agent may be included in 10 to 38% by weight, preferably 13 to 25% by weight relative to the total solids content (100% by weight) in the light-transmissive member resin composition of the present invention. At this time, if the content is less than 10% by weight, the surface resistance is not low enough to exhibit an antistatic property, and if it exceeds 38% by weight, problems such as surface defects and serious yellowing occur.

Fluorescent whitening agent may cause slight yellowing when the antistatic agent is added, so it is desirable to improve the whiteness. Fluorescent whitening agents can be used all conventional fluorescent whitening agents used in the art, specific examples are benzotriazole-phenylcoumarins, bis-benzoxazoles, tri Triazinephenylcoumarins, bis- (styryl) biphenyls, naphtotriazole-phenylcomarins, or a combination of two or more of them. County.

The amount of the fluorescent brightener may be included in an amount of 0.005 to 0.15% by weight, preferably 0.01 to 0.1% by weight based on the total solids content (100% by weight) in the resin composition for a light transmissive member of the present invention. In this case, when the content is less than 0.005% by weight, the effect of improving the whiteness is not obtained, and when the content exceeds 0.15% by weight, the total light transmittance, luminance, and color difference are reduced.

In addition, the light transmitting member may further include an additive made of a light diffusing agent, an ultraviolet absorber, a light stabilizer, a heat stabilizer and an antioxidant alone or in combination of two or more thereof.

The additive may be included in an amount of 0.05 wt% to 20 wt%, preferably 0.1 wt% to 10 wt%, based on the total solid content (100 wt%) in the light-transmissive member resin composition of the present invention.

The light diffusing agent exhibits an excellent light diffusing effect, and may be used all of conventional light diffusing agents used in the art, in particular, organic particles, inorganic particles or hollow particles may be used alone or in combination. Specifically, for example, silicon-based, acrylic-based, styrene-based, methyl methacrylate-styrene copolymer-based, polycarbonate-based, olefin-based crosslinked or uncrosslinked fine particles, silica, talc, calcium carbonate, barium sulfate, titanium dioxide (TiO ₂ ), One or two or more types selected from glass can be used in combination.

The ultraviolet absorber is to absorb light in the 300 ~ 400nm ultraviolet region emitted from the LED device. The aviation absorber may be used any conventional ultraviolet absorber used in the art, specifically, for example, organometallic; Cyanoacrylic type; Salicylate system; Oxalanilide system; Diketone system; 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 2-hydroxy-4-benzyloxybenzophenone, 2,2 ' Benzophenones such as dihydroxy-4-methoxybenzophenone; 2- [2-hydroxy-3,5-bis (α, α-dimethylbenzyl) phenyl] -2H-benzotriazole, 2- (5-methyl-2-hydroxyphenyl) benzotriazole, 2- ( 3,5-di-t-butyl-2-hydroxyphenyl) benzotriazole, 2- (2'-hydroxy-5'-t-octylphenyl) benzotriazole, 2- (3-t-butyl- 5-methyl-2-hydroxyphenyl) -5-chlorobenzotriazole, 2- (3,5-di-t-butyl-2-hydroxyphenyl) -5-chlorobenzotriazole, 2- (3, Benzotriazoles such as 5-di-t-amyl-2-hydroxyphenyl) benzotriazole and 2- (2'-hydroxy-5'-t-octylphenyl) benzotriazole; Malonic esters such as dimethylmalonate, diethylmalonate, dibenzyl malonate, and diallyl malonate; N- (4-ethoxycarbonylphenyl) -N-methyl-N-phenylformamidine, N, N-bis (4-ethoxycarbonylphenyl) -N-benzylformamidine, N-3,5 -Di-t-butyl-4-hydroxybenzyl-N'-4-ethoxycarbonylphenyl-N-phenylformamidine, N, N-bis (4-ethoxycarbonylphenyl) -N-3, 5-di-t-butyl-4-hydroxybenzylformamidine, N-4-butoxycarbonylphenyl-N'-4-ethoxycarbonylphenyl-N-3,5-di-t-butyl- Ultraviolet absorbers, such as formamidine system, such as 4-hydroxybenzylformamidine, can be used individually or in combination of 2 or more types. In particular, in consideration of ultraviolet absorption or thermal stability, a benzophenone series, a benzotriazole series or a malonic acid ester series are preferable.

It is preferable that the said light stabilizer prevents the fall of a total light transmittance, and can acquire a light stabilizer effect. The light stabilizer may use all conventional light stabilizers used in the art, and specific examples thereof include piperidinyl esters, oxazolidines and piperidino oxazolidines, piperidisspiroacetals, and diazacycloalkanones. And the like, and any one selected from these or a combination of two or more thereof can be used.

The heat stabilizer is preferably for preventing heat deformation, and may be used for all conventional heat stabilizers used in the art. Specific examples include cadmium stearate, cadmium laurate, cadmium lisinorenate, calcium laurate, zinc stearate, zinc octylate, and the like, which may be used alone or in combination of two or more thereof.

The antioxidant prevents deterioration of transparency, translucency, heat resistance, etc. of the translucent member made of the resin composition for the translucent member, and specific examples thereof are octadecyl 3- (3,5-di-t-butyl-4-hydroxy Phenyl) -propionate, n-octadecyl3- (3,5-di-t-butyl-4-hydroxyphenyl) -acetate, n-octadecyl3,5-di-t-butyl-4-hydroxy Hydroxybenzoate, n-hexyl 3,5-di-t-butyl-4-hydroxyphenylbenzoate, n-dodecyl 3,5-di-t-butyl-4-hydroxyphenylbenzoate, neo-dode Sil3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate, dodecyl-β (3,5-di-t-butyl-4-hydroxyphenyl) propionate Phenolic; Phosphorus compounds such as trisnonylphenyl phosphite, triphenyl phosphite, and tris (2,4-di-t-butylphenyl) phosphite; Dilauryl-3,3'-thiodipropionate, dimyristyl-3,3'-thiodipropionate, distearyl-3,3'- thiodipropionate, pentaerythritol tetrakis ( Antioxidants, such as sulfur type | system | group, such as 3-lauryl thio propionate), can be used individually or in combination of 2 or more types.

Figure 1a is a perspective view of the LED lamp according to a preferred embodiment of the present invention, Figure 1b is a perspective view of the LED lamp according to another preferred embodiment of the present invention.

As shown in FIG. 1, the LED lamp 110 includes a light transmitting member 111 and a heat sink 112. In addition, the LED module 121 and the substrate 122 may include an LED module 120. In this case, the light transmitting member 111 may be used alone or may further include an intensity improving layer inside the light transmitting member 111. The translucent member 111 is provided in front of the installed LED element 121 to transmit the light emitted from the LED element 121.

In order to manufacture the light transmitting member 111, all conventional methods used in the art may be used, and a single extrusion method or a double extrusion method is preferable.

Here, the single-layer extrusion method includes the step of injecting and melt-kneading the resin composition for the light-transmissive member and then cooling, thereby manufacturing a light-transmissive member. In addition, the dual extrusion method includes a step of injecting, melt-kneading, and then laminating and cooling the resin composition for the light transmitting member and the other resin composition, respectively, to form a surface layer and an strength improving layer, wherein the surface layer is the light transmitting member 111. Means. The light transmissive member 111 is provided with a strength enhancing layer (inner layer or middle layer) on the inner side, and may be formed in one kind of two layers, one kind three layers, two kinds two layers, and two kinds three layers according to the resin species and layers used. Can be. The strength enhancement layer may be formed of a single layer or multiple layers, and serves as a supporter and strength improvement of the LED lamp 110. In addition, the strength enhancing layer is produced using a resin having a strong bonding strength with the surface layer. That is, the same or different resin as the surface layer can be used. The surface layer or the strength enhancing layer can be produced with the resin composition for light transmitting member, and the surface layer is preferably prepared.

In general, the thickness of the light transmissive member 111 is preferably 0.01 to 0.2 mm, preferably 0.04 to 0.08 mm, in consideration of workability such as strength and handleability.

In addition, the strength-improving layer thickness is 0.5 to 3 mm, preferably 1 to 2 mm.

In general, the light transmitting member transmits a lot of dust and foreign substances due to the static electricity generated in the LED device, and the light transmitting member 111 of the present invention does not cause such a problem.

In addition, the light transmissive member 111 of the present invention exhibits excellent brightness and color difference by preventing yellowing, and has a permanent antistatic effect due to the internalized antistatic agent.

At this time, the initial yellowing index value YI of the light transmitting member 111 is 3.0 or less, preferably 2.0 or less.

In addition, the yellowness index change value YY is 2.0 or less, preferably 1.0 kYI or less, and according to the general composition of the present invention, a value between 0.1 and 0.5 kYI can be obtained.

In addition, the surface resistivity is 9.9 × 10 ¹⁰ Ω / □ or less, according to the general composition of the present invention can obtain a value between 1.4 × 10 ⁹ to 9.1 × 10 ¹⁰ Ω / □.

In addition, it is preferable that the light resistance does not change even after the mercury lamp test, and preferably 1.0 × 10 ⁹ to 9.9 x 10 ¹² Ω / square.

In addition, the total light transmittance is 50 to 85%, preferably 55 to 60%.

The heat sink 112 is provided at the rear of the LED element, and may use all of the conventional heat sinks used in the art, and specific examples thereof may be a metal or resin such as aluminum.

Hereinafter, preferred examples are provided to aid the understanding of the present invention, but the following examples are merely for exemplifying the present invention, and it will be apparent to those skilled in the art that various changes and modifications can be made within the scope and spirit of the present invention. It is natural that such variations and modifications fall within the scope of the appended claims.

Example 1

60.88 g of polycarbonate (TRIREX, Samyang Corp.), antistatic agent (Irgastat P-18, Ciba Specialty Chem) 30 g, fluorescent whitening agent (W, N company) 0.02 g As the light diffusing agent, 8 g of acrylic particles having an average particle diameter of 10 µm, 1 g of ultraviolet absorber, and 0.1 g of a thermal stabilizer (S product, S company) were mixed.

The resin composition (A) for translucent member was single-extruded at 200-260 degreeC in the molding die produced by semi-circle, and the monolayer translucent member was produced. At this time, the thickness of the diffusion member is 1.2 mm.

Example 2

In the same manner as in Example 1, a resin composition (A) for a light transmitting member was prepared.

In order to manufacture the resin composition for strength-enhancing layer (B) 98.3g of polycarbonate (TRIREX, Samyang), a thermoplastic resin, 1.5 g of silicon-based particles having an average particle diameter of 3 μm as a light diffusing agent, 0.1 g of an ultraviolet absorber, and a heat stabilizer (S product) , S company) 0.1g was mixed.

The translucent member resin composition (A) prepared above was formed in a semi-circular mold to be composed of a surface layer and an strength improving layer by a double extrusion method at 200 to 260 ° C. At this time, the surface layer was made of the resin composition for light transmitting members, and the thickness was 0.05 mm. In addition, the thickness of the strength enhancing layer is 1.15 mm.

Example 3

A light transmitting member was prepared in the same manner as in Example 1 except that the optical brightener was 0.05g and the amount of resin was adjusted.

Example 4

The same method as in Example 1 was carried out, except that the antistatic agent was 25g and the amount of resin was adjusted to prepare a light transmitting member.

Example 5

In the same manner as in Example 1, 25g of the antistatic agent and 0.05g of the optical brightener and the amount of the resin was adjusted to prepare a light transmitting member.

Comparative Example 1

A light transmitting member was prepared in the same manner as in Example 1 except that the amount of resin was adjusted without using a fluorescent brightener.

Comparative Example 2

The same method as in Example 1 was carried out, but the light transmitting member was prepared by controlling the amount of resin without using an antistatic agent and a fluorescent brightener.

Comparative Example 3

The same method as in Example 1 was carried out, but the light transmitting member was prepared by adjusting the amount of resin to 5 g of antistatic agent.

Comparative Example 4

The same method as in Example 1 was carried out, except that the antistatic agent was 40g and the amount of resin was adjusted to prepare a light transmitting member.

Comparative Example 5

A quaternary amine salt, a cationic surfactant, was coated on the outer surface of the light transmitting member with the antistatic coating solution.

Test Example

The physical properties of the light transmissive members prepared in Examples and Comparative Examples were measured by the following methods, and the results are shown in Tables 1 and 2 below.

 (1) yellowing (ㅿ YI)

The prepared sample is stored for 24 hours in a constant temperature and humidity (25 ℃, 50% Rh), and then allowed to stand for 75 hours, 75 ℃ using an aging tester (ohsung science) using a mercury lamp. Then, using a color difference meter (UV-2450, Shimadzu), the change in the yellowness index (Yellowness Index) based on Equation 1 below is measured. In this case, when the yellowness index change value ΔYI is less than 3, it is determined that there is no change in transmittance and luminance over time.

Yellowness Index Change (△ YI) = YI- YI ₀

YI; Yellowing value after exposure

YI ₀ ; Yellowness of the sample specimen or sample fragment (initial yellowing index value = initial color difference value)

(2) Surface resistivity (Ω / □)

Using a surface resistance measuring instrument (MCP-HT450, manufactured by Mitsubishi Chemical Co., Ltd.), the three points of the antistatic hard coating layer without the surface protective film and the antistatic pressure-sensitive adhesive layer without the release film laminated thereon were measured 10 times each. And the average value.

Example Comparative example One 2 3 4 5 One 2 3 4 5 Initial Yellow Index
(YI ₀ ) 2.07 2.15 2.43 2.01 2.40 4.02 1.95 1.95 5.48 2.01 Yellowing
(ㅿ YI) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 6.4 2.8 0.1 3.0 Surface resistivity (Ω / □) 6.00 × 10 ⁹ 6.00 × 10 ⁹ 6.00 × 10 ⁹ 7.00 × 10 ⁹ 7.00 × 10 ⁹ 5.30 × 10 ⁹ 7.00 × 10 ¹⁶ 4.00 × 10 ¹⁶ 5.00 × 10 ¹¹ 1.00 × 10 ¹⁰

(3) light resistance

The prepared sample was left to stand in a mercury lamp (OS-ovn11-bk01, Ohsung LST Co., Ltd.) at 75 ° C. over time to measure the surface resistivity.

Example Comparative example One 2 3 4 5 One 2 3 4 5 0 hours 6.00 × 10 ⁹ 6.00 × 10 ⁹ 6.00 × 10 ⁹ 7.00 × 10 ⁹ 7.00 × 10 ⁹ 9.00 × 10 ⁹ 7.00 × 10 ¹⁶ 4.00 × 10 ¹⁶ 5.00 × 10 ¹¹ 1.00 × 10 ¹⁰ 500 hours 2.14 × 10 ⁹ 1.97 × 10 ⁹ 3.69 × 10 ⁹ 5.67 × 10 ⁹ 3.12 × 10 ⁹ 1.58 × 10 ⁹ 8.76 × 10 ¹⁶ 5.33 × 10 ¹⁵ 8.00 × 10 ¹² 5.16 × 10 ¹¹ 1000 hours 2.56 × 10 ⁹ 2.21 × 10 ⁹ 3.42 × 10 ⁹ 1.90 × 10 ⁹ 1.12 × 10 ⁹ 1.54 × 10 ⁹ 3.60 × 10 ¹⁷ 7.21 × 10 ¹⁶ 4.55 × 10 ¹⁵ 6.21 × 10 ¹³ 1500 hours 3.11 × 10 ⁹ 2.62 × 10 ⁹ 3.92 × 10 ⁹ 7.50 × 10 ⁹ 9.12 × 10 ⁹ 1.38 × 10 ⁹ 5.43 × 10 ¹⁷ 9.10 × 10 ¹⁶ 2.14 × 10 ¹⁶ 9.75 × 10 ¹³ 1800 hours 3.58 × 10 ⁹ 1.95 × 10 ⁹ 4.11 × 10 ⁹ 8.40 × 10 ⁹ 8.12 × 10 ⁹ 1.42 × 10 ⁹ 1.70 × 10 ¹⁷ 8.40 × 10 ¹⁶ 7.67 × 10 ¹⁶ 1.50 × 10 ¹⁷

As shown in Table 1 and Table 2, the light-transmitting members of Examples 1 to 5 prepared in accordance with the embodiment of the present invention is excellent in brightness and color difference by preventing yellowing, and excellent light resistance with the internalized antistatic agent Could confirm. In addition, since it has a low surface resistivity and shows excellent light resistance even for a long time, it can be seen that the antistatic effect that foreign matter such as dust does not adhere to the light transmitting member is permanently shown.

Even if the strength enhancing layer is further formed inside the light transmitting member, it can be seen that only the light transmitting member of the present invention has excellent luminance, color difference, and light resistance.

In particular, it could be confirmed that the physical properties of Examples 1 to 4 in which the antistatic agent was added in an amount of 10 to 38% by weight and the fluorescent brightener in an amount of 0.005 to 0.15% by weight were more excellent.

On the other hand, Comparative Examples 1 to 4 prepared in the content of the antistatic agent outside the range of 10 to 38% by weight does not have an antistatic effect, or cause yellowing, do not have excellent brightness and color difference, it can be seen that has a high surface resistivity and light resistance there was. In addition, in Comparative Example 5 coated on the light transmitting member with the antistatic coating solution it was found that the light resistance is greatly reduced over time.

As described above, the light transmissive member of the present invention does not cause yellowing and permanently exhibits an antistatic effect, and can be used as various lighting lamps such as signboards or building interior lights.

Figure 1a is a perspective view of the LED lamp according to a preferred embodiment of the present invention,

Figure 1b is a perspective view of the LED lamp according to another preferred embodiment of the present invention.

** Description of the major symbols in the drawings **

110: LED light 111: transmissive member

112: heatsink 120: LED module

121: LED element 122: substrate or base

Claims (11)

A diffused light transmissive member for LED lighting comprising a thermoplastic resin, an antistatic agent and a fluorescent brightener, the light transmissive member having a surface resistivity of 9.9 × 10 ¹⁰ Ω / □ or less and a yellowing index change value of 2.0 μs YI or less. The translucent member according to claim 1, wherein the antistatic agent is contained in an amount of 10 wt% to 38 wt% and the fluorescent brightener is 0.005 wt% to 0.15 wt%. The translucent member according to claim 1, wherein the antistatic agent is included in an amount of 13 to 25% by weight and the optical brightener is 0.01 to 0.1% by weight. The translucent member according to claim 1, wherein the antistatic agent is at least one member selected from the group consisting of water-soluble metal oxide particles, conductive polymers, surfactants, and hydrophilic monomers. The translucent member of claim 4, wherein the antistatic agent is a surfactant and a conductive polymer. The optical brightening agent according to claim 1, wherein the optical brightener is benzotriazole-phenylcomarin, bis-benzoxazole, triazine-phenylcomarin, bis- (styryl) biphenyl and naphthotriazole-phenyl. At least one light-transmitting member selected from the group consisting of commarin-based compounds. The translucent member according to claim 1, wherein the thermoplastic resin is at least one member selected from the group consisting of an acrylic resin, a styrene-acrylic copolymer resin, a styrene resin, a styrene-acrylonitrile resin, a polycarbonate resin, and an olefin resin. The light transmitting member according to claim 1, further comprising at least one additive selected from the group consisting of a light diffusing agent, an ultraviolet absorber, a light stabilizer, a heat stabilizer, and an antioxidant. The translucent member according to claim 1, wherein the surface resistivity is 1.4 × 10 ⁹ to 9.1 × 10 ¹⁰ Ω / □. The translucent member according to claim 1, wherein the surface resistivity is 1.0 × 10 ⁹ to 9.9 × 10 ¹² Ω / □ even after the light resistance test. An LED lamp comprising the translucent member according to any one of claims 1 to 10 as a surface layer, and further comprising one to three strength enhancing layers inside the surface layer.

Images