JPH0638520B2 - Light emitting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a light emitting element device called a so-called LED (Light Emitting Device), and is characterized by the material of its reflection plate.

[Conventional technology and its problems]

Conventionally, various studies have been conducted because the reflectance of the reflector, which is one of the main components of the light emitting device, affects the performance of the light emitting device. As for the performance required for the reflector, it is needless to say that the reflector itself can be precisely molded at the time of molding, but at the time of high temperature applied during sealing with transparent resin such as epoxy resin or soldering of electronic parts. However, it is necessary that it does not deform, and the material used for the reflector has both the contradictory properties of high fluidity that enables precision molding and heat resistance that can withstand high temperatures during soldering. There is a need. Furthermore, those properties are improved under the condition that composition of the reflector material is improved to achieve high reflectance and high light-shielding rate required for the purpose as the reflector itself, for example, a large amount of additive components such as a filler is mixed. Needs to be achieved in.

Conventionally, so-called ABS resin, a titanium oxide filler of ABS resin, or a modified PPO resin or PBT resin has been proposed as the material of the reflector. However, it is extremely difficult for these resins to sufficiently satisfy the performance required for the reflector of the light emitting device as described above.

[Means for solving problems]

The inventors of the present invention have conducted extensive studies in order to solve such problems, but have paid attention to a so-called liquid crystal polyester, that is, a melt-processable polyester capable of forming an anisotropic melt phase, and arrived at the present invention as a result of the research.

That is, the present invention provides a light emitting element device characterized in that the reflector is made of a molded product of a melt-processable polyester resin composition capable of forming an anisotropic molten phase.

There are various types of light emitting device, but the main point is that the case is mainly composed of a reflector having a light emitting diode bonded to the inner surface, and the opening of the case accommodating the light emitting diode and other parts is A light emitting device is formed by sealing and protecting with a transparent material, that is, transparent synthetic resin such as acrylic resin or glass.

The liquid crystal polyester used in the present invention has a property that polymer molecular chains have a regular parallel arrangement in a molten state. The state in which the molecules are arranged in this manner is often called a liquid crystal state or a nematic phase of a liquid crystal substance. Such polymers are generally elongate, flattened, fairly rigid along the long axis of the molecule, and are composed of monomers that have multiple chain extension bonds, usually in either coaxial or parallel relationship. Manufactured.

The properties of the anisotropic molten phase can be confirmed by a conventional polarization inspection method using a crossed polarizer. More specifically, the anisotropic molten phase can be confirmed by using a Leitz polarization microscope and observing the sample placed on the Leitz hot stage under a nitrogen atmosphere at a magnification of 40 times. The polymer is optically anisotropic. That is, it transmits light when inspected between crossed polarizers. If the sample is optically anisotropic, polarized light will be transmitted even if it is stationary.

As the constituent component of the polymer forming the anisotropic molten phase as described above, one or more of aromatic dicarboxylic acid and alicyclic dicarboxylic acid is used. 1 of aromatic diol, alicyclic diol and aliphatic diol One or more Aromatic hydroxycarboxylic acids One or more Aromatic thiol carboxylic acids One or more Aromatic dithiols, aromatic thiol phenols 1
One or more of these include aromatic hydroxyamines, one or more of aromatic diamines, etc., and the polymer that forms the anisotropic melt phase consists only of polyester II) consisting of I) Polyester III) consisting of polyester IV) and polythiol ester consisting only of V) Polythiol ester consisting of V) VI) and polythiol ester VII) consisting of polyesteramide VIII) and a combination of polyesteramide consisting of Composed of.

Furthermore, although not included in the category of the combination of the above components,
Aromatic polyazomethine is included in the polymer forming the anisotropic molten phase, and specific examples of such a polymer include poly (nitrilo-2-methyl-1,4-phenylene nitriloethylidyne-1,4-phenyleneethyl). Lysine); poly (nitrilo-2-methyl-1,4-phenylene nitrilomethylidine-1,4-phenylene methylidine); and poly (nitrilo-2-chloro-1,4-phenylene nitrilomethylidine-1,4) -Phenylenemethylidine).

Furthermore, although not included in the category of the combination of the above components,
Polyester carbonate is included as a polymer forming the anisotropic molten phase. It consists essentially of 4-oxybenzoyl units, dioxyphenyl units, dioxycarbonyl units and terephthaloyl units.

The compounds constituting the above-mentioned I) to VIII) are listed below.

Aromatic dicarboxylic acids include terephthalic acid and 4,4'-
Diphenyldicarboxylic acid, 4,4'-triphenyldicarboxylic acid, 2,6-naphthalenedicarboxylic acid, diphenylether-4,4'-dicarboxylic acid, diphenoxyethane-
4,4'-dicarboxylic acid, diphenoxybutane-4,4'-dicarboxylic acid, diphenylethane-4,4'-dicarboxylic acid, isophthalic acid, diphenylether-3,3'-dicarboxylic acid, diphenoxyethane-3, Aromatic dicarboxylic acids such as 3'-dicarboxylic acid, diphenylethane-3,3'-dicarboxylic acid, naphthalene-1,6-dicarboxylic acid,
Or chloroterephthalic acid, dichloroterephthalic acid,
Examples thereof include alkyl, alkoxy or halogen substitution products of the above aromatic dicarboxylic acids such as bromoterephthalic acid, methyl terephthalic acid, dimethyl terephthalic acid, ethyl terephthalic acid, methoxy terephthalic acid and ethoxy terephthalic acid.

Examples of the alicyclic dicarboxylic acid include trans-1,4-cyclohexanedicarboxylic acid, dis-1,4-cyclohexanedicarboxylic acid, 1.3-cyclohexanedicarboxylic acid and other alicyclic dicarboxylic acids or trans-1,4- (1- Methyl) cyclohexanedicarboxylic acid, trans-1,4-
Examples thereof include alkyl-, alkoxy- or halogen-substituted products of the above alicyclic dicarboxylic acids such as (1-chloro) cyclohexanedicarboxylic acid.

As aromatic diols, hydroquinone, resorcin, 4,4'-dihydroxydiphenyl, 4,4'-dihydroxytriphenyl, 2,6-naphthalenediol, 4,4 '
-Dihydroxydiphenyl ether, bis (4-hydroxyphenoxy) ethane, 3,3'-dihydroxydiphenyl, 3,3'-dihydroxydiphenyl ether, 1,6
-Aromatic diols such as naphthalene diol, 2,2-bis (4-hydroxyphenyl) propane and 2,2-bis (4-hydroxyphenyl) methane, or chlorohydroquinone, methylhydroquinone, 1-butylhydroquinone, phenylhydroquinone, Methoxyhydroquinone, phenoxyhydroquinone: 4-chlororesorcin, 4-methylresorcin, etc. Alkyl, alkoxy or halogen substitution products of the above aromatic diols can be mentioned.

As the alicyclic diol, trans-1,4-cyclohexanediol, cis-1,4-cyclohexanediol,
Trans-1,4-cyclohexanedimethanol, cis-
1,4-Cyclohexanedimethanol, trans-1,3-
Alicyclic diols such as cyclohexanediol, cis-1,2-cyclohexanediol, trans-1,3-cyclohexanedimethanol, or trans-1,4- (1
-Methyl) cyclohexanediol, trans-1,4-
Examples thereof include alkyl-, alkoxy- or halogen-substituted compounds of the alicyclic diols such as (1-chloro) cyclohexanediol.

Alicyclic diols include ethylene glycol, 1,3-
Examples thereof include linear or branched aliphatic diols such as propanediol, 1,4-butanediol and neopentyl glycol.

As aromatic hydroxycarboxylic acid, 4-hydroxybenzoic acid, 3-hydroxybenzoic acid, 6-hydroxy-
Aromatic hydroxycarboxylic acids such as 2-naphthoic acid and 6-hydroxy-1-naphthoic acid, or 3-methyl-4-
Hydroxybenzoic acid, 3,5-dimethyl-4-hydroxybenzoic acid, 2,6-dimethyl-4-hydroxybenzoic acid,
3,5-Dimethoxy-4-hydroxybenzoic acid, 3-methoxy-4-hydroxybenzoic acid, 6-hydroxy-5-
Methyl-2-naphthoic acid, 6-hydroxy-5-methoxy-2-naphthoic acid, 3-chloro-4-hydroxybenzoic acid, 2-chloro-4-hydroxybenzoic acid, 2,3-dichloro-4-hydroxybenzoic acid Acid, 3,5-dichloro-4
-Hydroxybenzoic acid, 2,5-dichloro-4-hydroxybenzoic acid, 3-bromo-4-hydroxybenzoic acid, 6
Alkyl and alkoxy of aromatic hydroxycarboxylic acid such as -hydroxy-5-chloro-2-naphthoic acid, 6-hydroxy-7-chloro-2-naphthoic acid, 6-hydroxy-5,7-dichloro-2-naphthoic acid Another example is a halogen-substituted product.

As the aromatic mercaptocarboxylic acid, 4-mercaptobenzoic acid, 3-mercaptobenzoic acid, 6-mercapto-
Examples thereof include 2-naphthoic acid and 7-mercapto-2-naphthoic acid.

Aromatic dithiols include benzene-1,4-dithiol, benzene-1,3-dithiol, 2,6-naphthalene-
Examples thereof include dithiol and 2,7-naphthalene-dithiol.

Examples of the aromatic mercaptophenol include 4-mercaptophenol, 3-mercaptophenol, 6-mercaptophenol and 7-mercaptophenol.

4- as aromatic hydroxy amine and aromatic diamine
Aminophenol, N-methyl-4-aminophenol, 1,4-phenylenediamine, N-methyl-1,4-phenylenediamine, N, N'-dimethyl-1,4-phenylenediamine, 3-aminophenol, 3 -Methyl-4-
Aminophenol, 2-chloro-4-aminophenol, 4-amino-1-naphthol, 4-amino-4'-hydroxydiphenyl, 4-amino-4'-hydroxydiphenyl ether, 4-amino-4'-hydroxydiphenylmethane, 4-amino-4'-hydroxydiphenyl sulfide, 4,4'-diaminophenyl sulfide (thiodianiline), 4,4'-diaminodiphenyl sulfone, 2,5-diaminotoluene, 4,4'-ethylenedianiline, 4, 4'-diaminophenoxyethane, 4,4'-diaminophenylmethane (methylenedianiline), 4,4 '
-Diaminodiphenyl ether (oxydianiline) and the like.

The polymers I) to VIII) composed of the above components may or may not form an anisotropic melt phase depending on the composition ratio in the components, the polymer, and the sequence distribution, but they are used in the present invention. The polymers are limited to those forming an anisotropic melt phase among the above polymers.

Polyesters of I), II), III) and V which are polymers forming an anisotropic melt phase suitable for use in the present invention.
The polyesteramide of III) can be produced by various ester forming methods that allow organic monomer compounds having functional groups that form the required repeating units by condensation to react with each other. For example, the functional groups of these organic monomer compounds may be carboxylic acid groups, hydroxyl groups, ester groups, acyloxy groups, acid halides, amine groups and the like. The organic monomer compound can be reacted by a molten acidolysis method without the presence of a heat exchange fluid. In this method, the monomers are first heated together to form a molten solution of the reactants. As the reaction continues, solid polymer particles become suspended in the liquid.
Volatile by-products of the final stage of condensation (eg acetic acid or water)
A vacuum may be applied to facilitate removal of the.

Further, a slurry polymerization method can also be adopted to form a wholly aromatic polyester suitable for use in the present invention. In this way, the solid product is obtained in suspension in the heat exchange medium.

Whichever of the above melt acidolysis method and slurry polymerization method is adopted, the organic monomer reactant that induces a wholly aromatic polyester is in a modified form in which the hydroxyl group of such a monomer is esterified at room temperature (that is, a It can be subjected to the reaction (as an acyl ester). The lower acyl group preferably has about 2 to 4 carbon atoms. Preferably, the acetic acid ester of such an organic monomer reactant is subjected to the reaction.

Further, as typical examples of the catalyst which can be optionally used in either the molten acidolysis method or the slurry method, dialkyl tin oxide (eg, dibutyl tin oxide), diaryl tin oxide, titanium dioxide, antimony trioxide, alkoxy titanium silicate, titanium alkoxide. , Alkali and alkaline earth metal salts of carboxylic acids (eg zinc acetate), Lewis (eg BF ₃ ), hydrogen halides (eg HC
l) such as a gaseous acid catalyst. The amount of catalyst used is generally about 0.001 to 1 based on the total weight of the monomers.
%, Especially about 0.01 to 0.2% by weight.

The wholly aromatic polymers suitable for use in the present invention tend to be substantially insoluble in common solvents and therefore unsuitable for solution processing. However, as already mentioned, these polymers can be easily processed by conventional melt processing methods. Particularly preferred wholly aromatic polymers are somewhat soluble in pentafluorophenol.

The wholly aromatic polyesters suitable for use in the present invention generally have a weight average molecular weight of about 2,000 to 200,000, preferably about 10,000 to 50,000, particularly preferably about 20,000 to 25,000. On the other hand, suitable wholly aromatic polyesteramides generally have a molecular weight of about 5,000-50,000, preferably about 10,000-.
It is 30,000, for example 15,000 to 17,000. The measurement of such a molecular weight can be carried out by a standard measurement method which does not involve solution formation of gel permeation chromatography and other polymers, for example, by quantifying an end group by infrared spectroscopy on a compression molded film. The molecular weight can also be measured by using a pentafluorophenol solution and using a light scattering method.

The above fully aromatic polyesters and polyesteramides also have an inherent viscosity (IV) of at least about 2.0 dl / g, such as about 2.0-10.0 dl / g when dissolved in pentafluorophenol at a concentration of 0.1% by weight at 60 ° C. Is generally indicated.

The polymer exhibiting the anisotropic melt phase used in the present invention is preferably an aromatic polyester and an aromatic polyesteramide, and a polyester partially containing the aromatic polyester and the aromatic polyesteramide in the same molecular chain is also a preferable example. .

Preferred examples of compounds constituting them are 2,6-naphthalenedicarboxylic acid, 2,6-dihydroxynaphthalene, 1,
4-dihydroxynaphthalene and 6-hydroxy-2-
Naphthalene compounds such as naphthoic acid, 4,4'-diphenyldicarboxylic acid, biphenyl compounds such as 4,4'-dihydroxybiphenyl, the following general formulas (I), (II) or (II)
Compound represented by I): (However, x: alkylene (C _{1 to} C ₄ ), alkylidene, -O
-, - SO -, - SO 2 -, - S -, - group selected from _{CO- Y :-( CH 2) n -} (n = 1~4), - O (CH 2) n O- (n = A group selected from 1 to 4) p-hydroxybenzoic acid, terephthalic acid, hydroquinone, p-aminophenol, p-phenylenediamine and the like para-substituted benzene compounds and their nucleus-substituted benzene compounds (the substituents are chlorine). , Bromine, methyl, phenyl, 1-phenylethyl), isophthalic acid, resorcin, and other benzene compounds substituted at the eth position.

A preferable example of the polyester partially containing the above-mentioned constituents in the same molecular chain is polyalkylene terephthalate, and the alkyl group has 2 to 4 carbon atoms.

Among the above-mentioned constituents, a compound containing one or more kinds of compounds selected from naphthalene compounds, biphenyl compounds and para-substituted benzene compounds as essential constituents is a further preferable example. Of the p-position-substituted benzene compounds, p-hydroxybenzoic acid, methylhydroquinone and 1-phenylethylhydroquinone are particularly preferable examples.

The following are exemplified as specific combinations of constituent components.

1) 2) 3) Four) Five) 6) 7) 8) 9) Ten) 11) 12) 13) 14) 15) 16) 17) 18) 19) 20) twenty one) twenty two) twenty three) twenty four) twenty five) 26) 27) Wherein Z is -Cl, -Br, a substituent selected from -CH _3, X is alkylene (C ₁ ~C _4), alkylidene, -O -, - SO -, - SO
₂ -, - S -, - it is a substituent selected from CO-.

Particularly preferred anisotropic melt phase forming polyesters for use in the present invention include naphthalene moiety-containing repeating units such as 6-hydroxy-2-naphthoyl, 2,6-dihydroxynaphthalene and 2,6-dicarboxynaphthalene. About 1
It is contained in an amount of 0 mol% or more. Preferred polyesteramides are those containing repeating units of the above-mentioned naphthalene moieties and moieties consisting of 4-aminophenol or 1,4-phenylenediamine. Specifically, it is as follows.

(1) A polyester consisting essentially of the following repeating units I and II:

I II This polyester contains about 10 to 90 mol% of Unit I and about 1
It contains from 0 to 90 mol% of Unit II. In one embodiment, unit I is present in an amount of about 65-85 mol%, preferably about 70-80 mol% (eg, about 75 mol%). In another embodiment, the units II are present in much lower concentrations of about 15-35 mol%, preferably about 20-30 mol%.
Further, at least some of the hydrogen atoms bonded to the ring are optionally selected from the group consisting of an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, halogen, phenyl, substituted phenyl, and combinations thereof. It may be substituted with a selected substituent.

(2) A polyester consisting essentially of the following repeating units I, II and III.

I II III This polyester contains about 30 to 70 mol% of Unit I. The polyester is preferably about 40-60.
It contains mol% of Unit I, about 20-30 mol% of Unit II, and about 20-30 mol% of Unit III. In addition, at least a part of the hydrogen atoms bonded to the ring may be a group consisting of an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, halogen, phenyl, substituted phenyl, and a combination thereof. It may be substituted with a substituent selected from

(3) A polyester consisting essentially of the following repeating units I, II, III and IV: I II III IV (Wherein R means methyl, chloro, bromo or a combination thereof, and is a substituent for a hydrogen atom on the aromatic ring), and the unit I is about 20 to 60 mol%,
Unit II is included in an amount of about 5-18 mol%, unit III in an amount of about 5-35 mol%, and unit IV in an amount of about 20-40 mol%. The polyester is preferably about 35-45 mol% Unit I, about 10-15 mol% Unit II, about 15-.
It contains 25 mol% of unit III and about 25-35 mol% of unit IV. However, the total molar concentration of units II and III is substantially equal to the molar concentration of unit IV. In addition, at least a part of the hydrogen atoms bonded to the ring may be a group consisting of an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, halogen, phenyl, substituted phenyl, and a combination thereof. It may be substituted with a substituent selected from This wholly aromatic polyester has 60
It generally exhibits a logarithmic viscosity of at least 2.0 dl / g, for example 2.0-10.0 dl / g, when dissolved in pentafluorophenol at a concentration of 0.3 w / v% at ° C.

(4) A polyester consisting essentially of the following repeating units I, II, III and IV: I II III General formula (Wherein Ar represents a divalent group containing at least one aromatic ring), IV a general formula (In the formula, Ar ′ means a divalent group containing at least one aromatic ring), and the unit I is about 20 to 40 mol% and the unit II is 10 mol%. Content of more than about 50 mol%, unit III more than 5 mol% and less than about 30 mol%, and unit IV more than 5 mol% and less than about 30 mol%. The polyester is preferably about 20-30 mol% (eg about 25 mol%) of unit I, about 25-40 mol% (eg about 3).
5 mol%) of unit II, about 15-25 mol% (eg about 20 mol%)
Mol%) of unit III, and about 15-25 mol% (eg,
About 20 mol%) of unit IV. At least a part of the hydrogen atoms bonded to the ring may be an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms,
It may be substituted with a substituent selected from the group consisting of halogen, phenyl, substituted phenyl and combinations thereof.

Units III and IV have symmetrically arranged divalent bonds on one or more aromatic rings that connect these units to other units on either side within the polymer backbone (eg, on a naphthalene ring). When present, they are preferably symmetrical with respect to each other in the para position or arranged on a diagonal ring). However, asymmetric units such as those derived from resorcinol and isophthalic acid can also be used.

Preferred dioxyaryl units III are And a preferred dicarboxyaryl unit IV is Is.

(5) A polyester consisting essentially of the following repeating units I, II and III: I II General formula (Wherein Ar represents a divalent group containing at least one aromatic ring), III a general formula (Wherein Ar ′ means a divalent group containing at least one aromatic ring), and the unit I is about 10 to 90 mol% and the unit II is 5 to 45%. Mol%, unit III in an amount of 5 to 45 mol%. The polyester is preferably about 20-80.
It contains mol% of unit I, about 10-40 mol% of unit II, and about 10-40 mol% of unit III. More preferably, the polyester comprises about 60-80 mol% Unit I, about 10-20 mol% Unit II, and about 10-20.
It contains mol% of unit III. In addition, at least a part of the hydrogen atoms bonded to the ring may have 1 to 1 carbon atoms.
It may be substituted with a substituent selected from the group consisting of an alkyl group having 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, halogen, phenyl, substituted phenyl and combinations thereof.

Preferred dioxyaryl units II are And a preferred dicarboxyaryl unit III is Is.

(6) Polyesteramide consisting essentially of the following repeating units I, II, III and IV: I II General formula (In the formula, A means a divalent group containing at least one aromatic ring or a divalent trans-cyclohexane group), III General formula (In the formula, Ar is a divalent group containing at least one aromatic ring, Y
Means O, NH or NR, Z means NH or NR, respectively, and R means an alkyl group having 1 to 6 carbon atoms or an aryl group), IV general formula (In the formula, Ar ′ means a divalent group containing at least one aromatic ring), and the unit I is about 10 to 90 mol%, the unit II is about 5 to 45 mol%, and the unit III is About 5 to 45 mol% and unit IV in an amount of about 0 to 40 mol%. In addition, at least a part of the hydrogen atoms bonded to the ring may be a group consisting of an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, halogen, phenyl, substituted phenyl, and a combination thereof. It may be substituted with a substituent selected from

Preferred dicarboxyaryl units II are And the preferred unit III is Or And a preferred dioxyaryl unit IV is Is.

Further, the polymer forming the anisotropic molten phase of the present invention,
A part of one polymer chain is composed of the polymer segment forming the anisotropic melt phase described above, and the remaining part is composed of the thermoplastic resin segment not forming the anisotropic melt phase. Polymers are also included.

In the present invention, it is preferable to use a liquid crystal polyester resin composition obtained by mixing and blending one kind or two or more kinds of a white pigment and a filler with the above liquid crystal polyester as a material for forming the reflector of the issuing element device. . The blending amount of the white pigment is 0.5% by weight or more and the filler is 1% by weight or more based on the total composition of the liquid crystal polyester. The white pigment is preferably 7 to 70% by weight and the filler is 10 to 70% by weight, and particularly preferably the white pigment is 10 to 50% by weight and the filler 25.
~ 50% by weight.

As the filler, those known in the prior art may be used, for example, glass fiber, carbon fiber, graphite fiber, metal fiber, silicon carbide fiber, asbestos,
Wollastonite, inorganic fibers such as fibrous potassium titanate, whiskers, fibrous fillers such as various organic fibers,
Mica (muscovite, phlogopite, sericite, etc.), plate glass (glass flakes), talc, plate filler such as metal foil, calcium carbonate, quartz powder, silica, magnesium carbonate, calcium sulfate, clay, diatomaceous earth Granular fillers such as alumina, silica sand, glass powder, glass beads, metal particles and graphite can be used alone or in combination of two or more. Especially glass fiber is preferable.

Conventionally known white pigments may be used, and examples thereof include titanium oxide, zinc oxide, zinc sulfide, lead white, and sulfate compounds such as zinc sulfate, barite, and lithopone. Titanium oxide is particularly preferable.

In practicing the present invention, a reflection plate composed of a composition composed of glass fiber and titanium oxide is particularly preferable, but the filler and the white pigment may be composed of two or more kinds, respectively.

〔The invention's effect〕

According to the present invention, since the liquid crystal polyester as described above is used, the reflector plate case can be precisely molded due to its high fluidity, and since it has good heat resistance, there is little deformation due to heating, and an ideal reflector plate. Is obtained, and the performance of the light emitting device using this is extremely excellent.

In the present invention, a resin composition prepared by mixing liquid crystal polyester with a glass fiber and a white pigment such as titanium oxide is preferably used, which can further improve the heat resistance and the reflectance. In the case of liquid crystal polyester, even if these fillers are blended in comparison with other conventionally used synthetic resins such as ABS resin, the high fluidity of the liquid crystal polyester supports the finely and accurately molded reflector case. It is possible to use soldering heat resistance of 260 ° C for 10 seconds, which is the standard of heat resistance that is normally required for this type of electronic component, and other thermosetting resin having transparency, such as epoxy resin and urethane resin. It also has sufficient heat resistance when sealing the reflector case with a modified resin thereof or a transparent thermoplastic resin such as an acrylic resin, a polycarbonate resin or a polyacrylate resin. Further, by blending the white pigment as described above, it is possible to obtain a sufficiently high reflectance which is the original performance required for the reflector.

〔Example〕

Hereinafter, the present invention will be further described with reference to examples, but the present invention is not limited to these examples.

Examples 1 to 17 and Comparative Examples 1 to 2 The following liquid crystal polyester resins A, B, C and D were mixed with glass fibers, glass flakes and various white pigments at a ratio shown in Table 1 and pelletized with an extruder. Using this material, a reflector case of a cubic light emitting device having a side of 2 mm and a thickness of 0.2 mm was molded. This case was immersed in a heating bath at 260 ° C. for 10 seconds, and after allowing to cool, the strain from the original shape was measured by a three-dimensional measuring machine to measure the deformation ratio, and the heat-resistant dimensional stability was investigated. Further, the reflectance of the reflection plate molded from the resin composition is 700 nm by a Fourier transform infrared spectrometer.
The measurement was performed for each of m, 800 nm and 900 nm. The results are shown in Table 1.

(Liquid Crystal Polyester Sample) The liquid crystalline polyester resins A, B, C and D used have the following constitutional units.

A: B: C: D: A specific method for producing the above resins A, B, C and D will be described below.

<Resin A> 1081 parts by weight of 4-acetoxybenzoic acid, 460 parts by weight of 6-acetoxy-2-naphthoic acid, 166 of isophthalic acid
Parts by weight, 194 parts by weight of 1,4-diacetoxybenzene were charged into a reactor equipped with a stirrer, a nitrogen introducing tube and a distilling tube, and the mixture was heated to 260 ° C. by nitrogen gas flow. While distilling acetic acid from the reactor, at 260 ° C. for 2.5 hours,
Then, the mixture was vigorously stirred at 280 ° C. for 3 hours. Furthermore, set the temperature to 3
After raising the temperature to 20 ° C. and stopping the introduction of nitrogen, the pressure inside the reactor was gradually reduced and after 15 minutes the pressure was lowered to 0.1 mmHg, and stirring was carried out at this temperature and pressure for 1 hour.

The polymer obtained had an inherent viscosity of 5.0, measured in pentafluorophenol at a concentration of 0.1% by weight and at 60 ° C.

<Resin B> 1081 parts by weight of 4-acetoxybenzoic acid, 489 parts by weight of 2,6-diacetoxynaphthalene, and 332 parts by weight of terephthalic acid were charged into a reactor equipped with a stirrer, a nitrogen introducing pipe and a distilling pipe, and nitrogen was added. The mixture was heated to 250 ° C under a stream of air. Vigorous stirring was carried out at 250 ° C. for 2 hours and then at 280 ° C. for 2.5 hours while distilling acetic acid from the reactor. Furthermore, after raising the temperature to 320 ° C. and stopping the introduction of nitrogen, the pressure inside the reactor was gradually reduced and after 30 minutes the pressure was lowered to 0.2 mmHg, and stirring was carried out at this temperature and pressure for 1.5 hours.

The polymer obtained had an inherent viscosity of 2.5, measured in pentafluorophenol at a concentration of 0.1% by weight at 60 ° C.

<Resin C> 1261 parts by weight of 4-acetoxybenzoic acid and 691 parts by weight of 6-acetoxy-2-naphthoic acid were placed in a reactor equipped with a stirrer, a nitrogen introducing tube and a distilling tube, and the mixture was placed under a nitrogen stream. The mixture was heated to 250 ° C. While distilling acetic acid from the reactor, the mixture was vigorously stirred at 250 ° C. for 3 hours and then at 280 ° C. for 2 hours. Furthermore, after raising the temperature to 320 ° C. and stopping the introduction of nitrogen, the pressure inside the reactor is gradually reduced to 20
After a minute, the pressure was lowered to 0.1 mmHg, and the mixture was stirred at this temperature and pressure for 1 hour.

The polymer obtained had an inherent viscosity of 5.4 measured in pentafluorophenol at a concentration of 0.1% by weight at 60 ° C.

<Resin D> 1612 parts by weight of 6-acetoxy-2-naphthoic acid, 4-
290 parts by weight of acetoxyacetanilide, 249 parts by weight of terephthalic acid, and 0.4 parts by weight of sodium acetate were placed in a reactor equipped with a stirrer, a nitrogen introducing tube and a distilling tube, and the mixture was heated to 250 ° C. under a nitrogen stream. While distilling acetic acid from the reactor, 250 ° C for 1 hour, then 300 ° C
Vigorously stirred for 3 hours. Furthermore, after raising the temperature to 340 ° C. and stopping the introduction of nitrogen, the pressure inside the reactor was gradually reduced and after 30 minutes the pressure was lowered to 0.2 mmHg, and stirring was continued for 30 minutes at this temperature and pressure.

The polymer obtained had an inherent viscosity of 3.9 as measured in pentafluorophenol at a concentration of 0.1% by weight at 60 ° C.

Claims (9)

[Claims] 1. A light-emitting element device, wherein the reflector is made of a molded product of a melt-processable polyester resin composition capable of forming an anisotropic melt phase. 2. The light-emitting device according to claim 1, wherein the melt-processable polyester resin composition capable of forming an anisotropic melt phase comprises the same polyester and a white pigment. 3. The light emitting element device according to claim 2, wherein the white pigment is titanium oxide. 4. The light emitting device according to claim 1, wherein the melt-processable polyester resin composition capable of forming an anisotropic melt phase comprises the same polyester and a filler. 5. The light emitting element device according to claim 4, wherein the filler is a fibrous filler, a plate-like filler or a granular filler. 6. The light emitting device according to claim 1, wherein the melt-processable polyester resin composition capable of forming an anisotropic melt phase comprises the same polyester, a filler and a white pigment. 7. The light emitting element device according to claim 6, wherein the filler is a fibrous filler, a plate-like filler or a granular filler. 8. The light emitting element device according to claim 7, wherein the fibrous filler is glass fiber. 9. The light emitting element device according to claim 7, wherein the fibrous filler is glass fiber and the white pigment is titanium oxide.