JP2002150827A - Ultraviolet ray absorbing fluorescent lamp cover, and lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transparent fluorescent lamp cover not tinted in yellow even cutting 380-410 nm, with a light resistant property of which, the life is longer than that of the fluorescent lamp. SOLUTION: A light of 410 nm or less is made to cut by 90% or more by making a transparent resin contain a fluorescent whitening agent. The fluorescent whitening agent is expressed by the formula (1), where; R1 and R4 represent a hydrogen atom, an alkyl group, or an alkoxyl group, R2 and R3 represent an alkyl group, and (A) represents a substituent of aryl group or an ethenyl group.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultraviolet absorbing fluorescent lamp cover for cutting off ultraviolet rays generated from a lighting device such as a fluorescent lamp which causes harmful and flying insects, and a lighting device provided with the same.

[0002]

2. Description of the Related Art For the purpose of shielding ultraviolet rays from sunlight harmful to the human body and ultraviolet rays generated from fluorescent lamps which cause flying insects, paints containing an ultraviolet absorber and fluorescent lamps provided with a heat shrink film are used. It has been proposed and launched. Also, JP-A-8-111208, JP-A-10-21714,
It is proposed in Japanese Patent Application Laid-Open No. H11-106666. However, its absorption edge is 38 to suppress yellowness.
Although it is possible to absorb light having a wavelength shorter than 0 nm or up to a longer wavelength of 410 nm, the color is adjusted by adding a dye for adjusting the color tone in order to have a strong yellow color or to suppress the yellow color. The fact that the absorption edge is short-wave has a low ultraviolet shielding ability, and in particular, a three-wavelength fluorescent lamp, which is expected to be widely used in the future, has no absorption at 380 nm or less, so if it has a small amount, it blocks flying insects. There is no necessity because the ability can be expected from the three-wavelength fluorescent lamp itself. However, even in the case of a three-wavelength fluorescent lamp, the emission around 405 nm remains, so that the insect light curve disclosed in Japanese Patent Application Laid-Open No. 7-3189 (in general, insects strongly react to wavelengths near the ultraviolet region, This is a graph of the wavelength dependence.)
As is clear from the above, it is necessary to shield the emission line near 405 nm in order to effectively prevent flying insects, and it is desired to cut off the light up to 410 nm. When the light of up to 410 nm is cut, the color becomes yellowish. This can be solved by adding a dye for adjusting the color tone. However, there is a disadvantage that the light transmittance in the visible region is sacrificed.

Further, a white laminated polyester film which is excellent in light resistance, whiteness and adhesiveness in which a fluorescent whitening agent is compounded together with an ultraviolet absorber to suppress yellowing due to ultraviolet irradiation (JP-A-11-291432, Kaihei 11-2682
No. 1) has been proposed, but the same disadvantages have not been solved. Further, a composition comprising a transparent resin containing a fluorescent whitening agent has been proposed as a fluorescent lamp ultraviolet cut cover (Japanese Patent Publication No. 6-3682), but there is a problem that the fluorescent whitening agent is deteriorated and yellowed. is there.

[0004]

SUMMARY OF THE INVENTION The present invention has been developed to solve the above-mentioned problems of the prior art. It is an object of the present invention to provide a fluorescent whitening dye which emits blue fluorescence which is a complementary color of yellow. To provide a replaceable fluorescent lamp cover having a high transparency without yellowish color even when the wavelength is cut to 410 nm which is longer than 380 nm, and having light resistance longer than the life of the fluorescent lamp. Yes.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a fluorescent lamp cover for cutting ultraviolet light, which is made of a thermoplastic resin containing a fluorescent whitening agent, and a lighting fixture using the cover. In each invention. (1) A transparent fluorescent lamp cover characterized in that a transparent resin contains a fluorescent whitening agent and cuts light of 410 nm or less by 90% or more. (2) The fluorescent lamp cover according to the above (1), wherein the fluorescent whitening agent is represented by the following general formula (I).

Embedded image(Where R₁And R_FourIs a hydrogen atom, an alkyl group or
Represents an alkoxy group; _TwoAnd R_ThreeRepresents an alkyl group
And (A) represents a substituted aryl or substituted ethenyl group.
You. )

(3) The compound represented by the general formula (I) is
The fluorescent lamp cover according to the above (1) or (2), which is a compound represented by the following general formula (II).

Embedded image(Where R_FiveAnd R₇Is R_TwoIs a group equivalent to
R₆And R₈Is R _ThreeIs a group having the same meaning as n is 1
Or an integer of 2. (4) The transparent resin is methyl methacrylate: styrene = 1:
The copolymer is preferably 99% by mass to 99: 1% by mass.
The fluorescent lamp according to any one of (1) to (3) above,
cover. (5) Broadband or three-wavelength fluorescent lamps
Cover with the cover according to any of the above (1) to (4)
Lighting equipment that cuts light of 410 nm or less.

[0007]

DETAILED DESCRIPTION OF THE INVENTION Generally, optical brighteners are used in amounts of about 320 to
It absorbs light having a wavelength of about 410 nm, and has a wavelength of about 410 to about 50.
It is made of a compound having a property of emitting light having a wavelength of 0 nm. The woven fabric dyed with these fluorescent whitening agents adds blue light of a wavelength of about 410 to about 500 nm newly emitted by the fluorescent whitening agent in addition to the original yellow reflected light, so that the reflected light is white. And the energy of visible light is increased by the amount of the fluorescence effect, resulting in whitening. If the amount of the UV absorber added is adjusted so that the UV light of 410 nm or less is cut in the molded article obtained by adding the UV absorber to the thermoplastic resin, the reflected light has a strong yellow tint, but instead of or instead of the UV absorber It is found that reflected light is whitened when an appropriate amount of fluorescent whitening agent is added.
It is known from JP-A-3682 that the light resistance can be significantly improved by using a methyl methacrylate: styrene copolymer as a transparent resin or a compound of the general formula (I) as a fluorescent whitening agent. Heading reached the present invention.

The polycondensation resin component used in the transparent resin includes polyurethane, polyester, polyamide, polyurea, and polycarbonate. Specific examples are shown below in the form of raw material monomers. However, P-23
And P-34 and thereafter are exemplified in the form of a polymer, but the present invention is not limited thereto. All acidic groups in each polymer are shown in non-dissociated form. In addition, for those produced by a condensation reaction such as polyester and polyamide, the constituent components are all dicarboxylic acids, diols, diamines, hydroxycarboxylic acids, regardless of the raw materials,
Expressed in aminocarboxylic acid and the like. The ratio in parentheses means the molar percentage ratio of each component.

P-1: Toluene diisocyanate / ethylene glycol / 1,4-butanediol (50/15
/ 35) P-2: 4,4'-diphenylmethane diisocyanate / 1,3-propanediol / polypropylene glycol (Mw = 1000) (50/45/5) P-3: Toluene diisocyanate / hexamethylene diisocyanate / ethylene glycol / Polyethylene glycol (Mw = 600) / 1,4-butanediol (40/10/20/10/20) P-4: 1,5-naphthylene diisocyanate / hexamethylene diisocyanate / diethylene glycol /
1,6-hexanediol (25/25/35/15)

P-5: 4,4'-diphenylmethane diisocyanate / hexamethylene diisocyanate / tetraethylene glycol / ethylene glycol / 2,2-
Bis (hydroxymethyl) propionic acid (40/10 /
20/20/10) P-6: 4,4'-diphenylmethane diisocyanate / hexamethylene diisocyanate / butanediol /
Ethylene glycol / 2,2-bis (hydroxymethyl) propionic acid (40/10/20/20/10) P-7: 1,5-naphthylene diisocyanate / butanediol / 4,4'-dihydroxy-diphenyl-2 ,
2'-propane / polypropylene glycol (Mw = 4
00) / 2,2-bis (hydroxymethyl) propionic acid (50/20/5/10/15) P-8: 1,5-naphthylene diisocyanate / hexamethylene diisocyanate / 2,2-bis (hydroxymethyl) Butanoic acid / polybutylene oxide (Mw = 50
0) (35/15/25/25)

P-9: isophorone diisocyanate / diethylene glycol / neopentyl glycol / 2,2
-Bis (hydroxymethyl) propionic acid (50/20
/ 20/10) P-10: toluene diisocyanate / 2,2-bis (hydroxymethyl) butanoic acid / polyethylene glycol (Mw = 1000) / cyclohexanedimethanol (50/10/10/30) P-11: diphenylmethane diisocyanate / Hexamethylene diisocyanate / tetraethylene glycol / butanediol / 2,4-di (2-hydroxy) ethyloxycarbonylbenzenesulfonic acid (40/10 /
10/33/7)

P-12: diphenylmethane diisocyanate / hexamethylene diisocyanate / butanediol / ethylene glycol / 2,2-bis (hydroxymethyl) butanoic acid / 2,4-di (2-hydroxy) ethyloxycarbonylbenzenesulfonic acid (40 / 10/2
0/15/10/5) P-13: Terephthalic acid / isophthalic acid / cyclohexanedimethanol / 1,4-butanediol / ethylene glycol (25/25/25/15/10) P-14: Terephthalic acid / isophthalic Acid / 4,4'-dihydroxy-diphenyl-2,2-propane / tetraethylene glycol / ethylene glycol (30/20 /
20/15/15) P-15: Terephthalic acid / isophthalic acid / cyclohexane dimethanol / neopentyl glycol / diethylene glycol (20/30/25/15/10) P-16: Terephthalic acid / isophthalic acid / 4, 4 ' -Benzene dimethanol / diethylene glycol / neopentyl glycol (25/25/25/15/10)

P-17: terephthalic acid / isophthalic acid /
5-sulfoisophthalic acid / ethylene glycol / neopentyl glycol (24/24/2/25/25) P-18: terephthalic acid / isophthalic acid / 5-sulfoisophthalic acid / cyclohexanedimethanol / 1,4-butanediol / Ethylene glycol (22/22/6 /
25/15/10) P-19: isophthalic acid / 5-sulfoisophthalic acid / cyclohexanedimethanol / ethylene glycol (40
/ 10/40/10) P-20: cyclohexanedicarboxylic acid / isophthalic acid / 2,4-di (2-hydroxy) ethyloxycarbonylbenzenesulfonic acid / cyclohexanedimethanol /
Ethylene glycol (30/20/5/25/20)

P-21: 11-aminoundecanoic acid (1
00) P-22: 12-aminododecanoic acid (100) P-23: Reaction product of poly (12-aminododecanoic acid) and maleic anhydride (50/50) P-24: 11-aminoundecanoic acid / 7 -Aminoheptanoic acid (50/50) P-25: hexamethylenediamine / adipic acid (50
/ 50) P-26: tetramethylenediamine / adipic acid (50
/ 50) P-27: hexamethylenediamine / sebacic acid (50
/ 50) P-28: N, N-dimethylethylenediamine / adipic acid / cyclohexanedicarboxylic acid (50/20/3
0)

P-29: Toluene diisocyanate /
4,4'-diphenylmethane diisocyanate / hexamethylenediamine (30/20/50) P-30: nonamethylenediamine / urea (50/50) P-31: hexamethylenediamine / nonamethylenediamine / urea (25/25 / 50) P-32: toluene diisocyanate / hexamethylenediamine / 2,2-bis (hydroxymethyl) propionic acid (50/40/10) P-33: 11-aminoundecanoic acid / hexamethylenediamine / urea (33/33) / 33)

The monomers forming the vinyl polymer of the present invention include acrylic esters, specifically, methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, sec-butyl acrylate. Tert-butyl acrylate, amyl acrylate, hexyl acrylate, 2-ethylhexyl acrylate, octyl acrylate, tert-octyl acrylate, 2-chloroethyl acrylate, 2-
Bromoethyl acrylate, 4-chlorobutyl acrylate, cyanoethyl acrylate, 2-acetoxyethyl acrylate, dimethylaminoethyl acrylate,
Benzyl acrylate, methoxybenzyl acrylate, 2-chlorocyclohexyl acrylate, cyclohexyl acrylate, furfuryl acrylate, tetrahydrofurfuryl acrylate, phenyl acrylate, 5-hydroxypentyl acrylate, 2-methoxyethyl acrylate, 3-methoxybutyl acrylate, 2-ethoxybutyl Acrylate, 2-ethoxyethyl acrylate, 2-iso-propoxy acrylate, 2-butoxyethyl acrylate, 2- (2-methoxyethoxy) ethyl acrylate, 2- (2-methoxyethoxy) ethyl acrylate, 2- (2-butoxyethoxy) ) Ethyl acrylate, ω-methoxy polyethylene glycol acrylate (additional mole number n = 9), 1
-Bromo-2-methoxyethyl acrylate, 1,1-
And dichloro-2-ethoxyethyl acrylate. In addition, the following monomers can be used.

Methacrylic esters: Specific examples thereof include methyl methacrylate, ethyl methacrylate, n
-Propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, sec-butyl methacrylate, tert-butyl methacrylate, amyl methacrylate, hexyl methacrylate, cyclohexyl methacrylate, benzyl methacrylate, chlorobenzyl methacrylate, octyl methacrylate, stearyl methacrylate, sulfopropyl Methacrylate, N-ethyl-N-phenylaminoethyl methacrylate, 2- (3-phenylpropyloxy) ethyl methacrylate, dimethylaminophenoxyethyl methacrylate, furfuryl methacrylate, tetrahydrofurfuryl methacrylate, phenyl methacrylate, cresyl methacrylate, naphthyl methacrylate , 2-hydroxyethyl methacrylate, 4-hydroxybutyl methacrylate, triethylene glycol monomethacrylate, dipropylene glycol monomethacrylate, 2-methoxyethyl methacrylate, 3-methoxybutyl methacrylate, 2-acetoxyethyl methacrylate, 2-acetoacetoxyethyl methacrylate, 2-ethoxyethyl methacrylate, 2-iso-propoxyethyl methacrylate,
2-butoxyethyl methacrylate, 2- (2-methoxyethoxy) ethyl methacrylate, 2- (2-ethoxyethoxy) ethyl methacrylate, 2- (2-butoxyethoxy) ethyl methacrylate, ω-methoxy polyethylene glycol methacrylate (number of moles added n) =
6), acrylic methacrylate, dimethylaminoethylmethyl methacrylate chloride salt and the like.

Vinyl esters: Other specific examples include vinyl acetate, vinyl propionate, vinyl butyrate, vinyl isobutyrate, vinyl caproate, vinyl chloroacetate, vinyl methoxy acetate, vinyl phenyl acetate, and vinyl benzoate. And vinyl salicylate.

Acrylamides: for example, acrylamide, methylacrylamide, ethylacrylamide, propylacrylamide, isopropylacrylamide,
n-butylacrylamide, sec-butylacrylamide, tert-butylacrylamide, cyclohexylacrylamide, benzylacrylamide, hydroxymethylacrylamide, methoxyethylacrylamide, dimethylaminoethylacrylamide, phenylacrylamide, dimethylacrylamide, diethylacrylamide, β-cyanoethylacrylamide, N-
(2-acetoacetoxyethyl) acrylamide, diacetone acrylamide, and the like.

Methacrylamides: For example, methacrylamide, methyl methacrylamide, ethyl methacrylamide, propyl methacrylamide, isopropyl methacrylamide, n-butyl methacrylamide, sec-butyl methacrylamide, tert-butyl methacrylamide, cyclohexyl methacrylamide, Benzyl methacrylamide, hydroxy methacrylamide, chlorobenzyl methacrylamide, octyl methacrylamide,
Stearyl methacrylamide, sulfopropyl methacrylamide, N-ethyl-N-phenylaminoethyl methacrylamide, 2- (3-phenylpropyloxy)
Ethyl methacrylamide, dimethylaminophenoxyethyl methacrylamide, furfuryl methacrylamide,
Tetrahydrofurfuryl methacrylamide, phenyl methacrylamide, cresyl methacrylamide, naphthyl methacrylamide, 2-hydroxyethyl methacrylamide, 4-hydroxybutyl methacrylamide, triethylene glycol monomethacrylamide, dipropylene glycol monomethacrylamide, 2-methoxy Ethyl methacrylamide, 3-methoxybutyl methacrylamide, 2-acetoxyethyl methacrylamide, 2-acetoacetoxyethyl methacrylamide, 2-ethoxyethyl methacrylamide, 2-iso-propoxyethyl methacrylamide, 2-butoxyethyl methacrylamide, 2 -(2-methoxyethoxy) ethyl methacrylamide, 2- (2-ethoxyethoxy) ethyl methacrylamide, 2- (2 (Butoxyethoxy) ethyl methacrylamide, ω-methoxy polyethylene glycol methacrylamide (additional mole number n = 6), acryl methacrylamide, dimethylamino methacrylamide, diethylamino methacrylamide, β-cyanoethyl methacrylamide, N- (2-acetoacetoxyethyl) ) Methacrylamide and the like.

Olefins: For example, dicyclopentadiene, ethylene, propylene, 1-butene, 1-pentene, vinyl chloride, vinylidene chloride, isoprene, chloroprene, butadiene, 2,3-dimethylbutadiene and the like.

Styrenes: For example, styrene, methylstyrene, dimethylstyrene, trimethylstyrene, ethylstyrene, isopropylstyrene, chloromethylstyrene, methoxystyrene, acetoxystyrene, chlorostyrene, dichlorostyrene, bromostyrene, methyl vinyl benzoate And the like.

Vinyl ethers: For example, methyl vinyl ether, butyl vinyl ether, hexyl vinyl ether, methoxyethyl vinyl ether, dimethylaminoethyl vinyl ether and the like can be mentioned.

Other examples include butyl crotonate, hexyl crotonate, dibutyl itaconate, dimethyl maleate, dibutyl maleate, dimethyl fumarate, dibutyl fumarate, methyl vinyl ketone, phenyl vinyl ketone, methoxyethyl vinyl ketone, and glycidyl. Acrylate, glycidyl methacrylate, N-vinyl oxazolidone, N-vinyl pyrrolidone, acrylonitrile,
Examples include methacrylonitrile, methylenemolone nitrile, and vinylidene.

The monomers used in the polycondensate and polymer of the present invention can be obtained by combining two or more monomers according to various purposes (for example, improvement in hardness, softness, tensile strength, light resistance, etc.). It may be used as a comonomer. The monomer of the present invention in the polymer is preferably a methacrylate type,
Acrylamide, methacrylamide, and styrene. More preferably, it is a methyl methacrylate: styrene = 1: 99% by mass to 99: 1% by mass copolymer.

The optical brightener used in the present invention comprises:
It can be selected from those commercially available or the following new substances based on light resistance and the like.

[0027]

Embedded image(Where R₁And R_FourIs a hydrogen atom, an alkyl group or
Represents an alkoxy group; _TwoAnd R_ThreeRepresents an alkyl group
You. (A) represents a substituted aryl or substituted ethenyl group.
You. )

In the general formula (I) of the present invention, R ₁ ,
R ₂ , R ₃ , R ₄ and (A) are described in detail below. R ₁ and R ₄ represent a hydrogen atom, an alkyl group or an alkoxy group, and more specifically, a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, or an alkoxy group having 1 to 8 carbon atoms.

More specifically, R ₁ and R ₄ are a hydrogen atom, methyl, ethyl, n-propyl, n-butyl, n-
Alkyl groups such as octyl, isopropyl, isobutyl, 2-ethylhexyl, t-butyl, t-amyl, t-octyl, cyclopentyl or cyclohexyl, or methoxy, ethoxy, n-propoxy, n-butoxy, n-octyloxy, isopropoxy , Isobutoxy, 2-ethylhexyloxy, t-butoxy or cyclohexyloxy. R ₁ and R ₄ are preferably a hydrogen atom or an alkyl group, particularly preferably a hydrogen atom.

R ₂ and R ₃ represent an alkyl group, specifically, an alkyl group having 1 to 16 carbon atoms, and more specifically, methyl, ethyl, n-propyl, n-butyl,
represents an alkyl group such as n-octyl, n-hexadecanyl (cetyl), isopropyl, isobutyl, 2-ethylhexyl, t-butyl, t-amyl, t-octyl, cyclopentyl or cyclohexyl. Preferably,
R ₂ is a methyl, isopropyl, t-butyl or cyclohexyl group; R ₃ is methyl, ethyl, n-propyl, n-butyl, n-pentyl, n-hexyl or 2
-Ethylhexyl group. Particularly preferably, R ₂ is t
- be butyl or cyclohexyl, R ₃ is methyl, n- butyl, n- octyl or 2-ethylhexyl group.

(A) represents a substituted aryl group or a substituted ethenyl group, and more specifically represents a substituted aryl group having 6 to 40 carbon atoms or a substituted ethenyl group having 8 to 40 carbon atoms. It is preferably a substituted aryl or substituted ethenyl group shown below.

[0032]

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[0033]

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[0034]

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[0035]

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[0036]

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In the formula, R ₁ ′ and R ₄ ′ have the same meaning as R ₁ and R ₄ described above. R ₂ ′ is the above R ₂ ,
R ₃ ′ is the same group as R ₃ . m represents an integer of 1 to 5. X and Y represent an alkyl, aryl, alkoxy, alkylamino, arylamino, amino or hydroxyl group. Z represents a substituent. When X and Y other than amino and hydroxyl groups are described in detail, an alkyl group such as methyl, ethyl, isopropyl, t-butyl or cyclohexyl, an aryl group such as phenyl, tolyl or naphthyl, an alkoxy group such as methoxy, ethoxy or isopropoxy, Alkylamino groups such as amino, aminomethyl, ethylamino, octylamino, dimethylamino or N-methyl-N-ethylamino, anilino,
An arylamino group such as 4-tolylamino or N-methylanilino. X and Y are preferably aryl,
It is an alkoxy or anilino group. Examples of the substituent of Z include alkyl, aryl, alkoxycarbonyl, cyano and the like.

The compound represented by the general formula (I) is preferably a compound represented by the following general formula (II).

Embedded image

Where R_FiveAnd R₇Is R_TwoSynonymous with
And R is₆And R₈Is R _ThreeA group equivalent to
You. n represents an integer of 1 or 2. These compounds are particularly
Synthesis by the method described in Japanese Unexamined Patent Publication No. 11-29556.
Can be.

Specific examples of the fluorescent whitening agent (including the compound represented by the general formula (I) or (II)) used in the present invention are shown below, but the present invention is not limited thereto.

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[0041]

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[0042]

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[0043]

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[0044]

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[0045]

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[0046]

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[0047]

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[0048]

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[0049]

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[0050]

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[0051]

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[0052]

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[0053]

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[0054]

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[0055]

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[0056]

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Although the above is an example of an organic substance, the present invention is not limited thereto, and an inorganic substance may be used. These optical brighteners can be used alone or in combination of two or more as needed. Since the amount of addition varies depending on the thickness of the molded product, the properties of the fluorescent whitening agent, the presence or absence of the ultraviolet absorber, the properties, and the amount of addition, it cannot be determined uniquely, but those skilled in the art should do some tests. Can be easily determined by Generally, a molded product having a thickness of 1 mm is 0.1 to 10% by mass.
Is enough. It can be considered that the blending amount and the thickness of the added material are almost half proportional. For example, the compound of the formula (1) is 0.5% by mass, the compound of the formula (2) is 0.3% by mass, and the compound of the formula (14) is 0.2% by mass in a molded product having a thickness of 1 mm.
By adding 1% by mass, light of 410 nm or less can be substantially cut. Thus, 41 according to the present invention
The light absorption characteristic at 0 nm depends on the thickness of the medium, the fluorescent whitening agent and the amount added.

The attached figure is a graph showing the result of measuring the absorption spectrum by a conventional method by attaching the fluorescent lamp cover of the present invention and a commercially available ultraviolet-absorbing adhesive film to a glass plate. This indicates that the yellowish color is low and the transparency is high despite the absorption of light having a long wavelength up to 410 nm.

As described above, in the present invention, the purpose can be achieved by blending a fluorescent whitening agent into a transparent resin. However, when there is concern about the light fastness of the fluorescent whitening agent, only the fluorescent whitening agent is used. When the short wavelength region cannot be cut sufficiently, it is desirable to use an ultraviolet absorber in combination. Generally, an ultraviolet absorber is a compound having a property of absorbing ultraviolet light and converting it into heat. They are broadly classified into benzotriazoles, benzophenones, salicylic acids, and cyanoacrylates. Benzotriazole-based effective absorption wavelength is about 270
At 380 nm, typical examples are 2- (2′-hydroxy-5′-methylphenyl) benzotriazole,
(2′-hydroxy-5′-t-butylphenyl) benzotriazole, 2- (2′-hydroxy-3 ′, 5 ′
-Di-t-butylphenyl) benzotriazole, 2-
(2′-hydroxy-3′-t-butyl-5′-methylphenyl) -5-chlorobenzotriazole, 2-
(2′-hydroxy-3 ′, 5′-di-t-butylphenyl) -5-chlorobenzotriazole, 2- (2′-
Hydroxy-3 ′, 5′-di-t-amylphenyl) benzotriazole, 2- (2′-hydroxy-4′-octoxyphenyl) benzotriazole and the like can be mentioned.

The effective absorption wavelength of the benzophenone system is about 27
0 to 380 nm, and typical examples are 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 2-hydroxy-5-dodecyloxybenzophenone, 2,2′- Dihydroxy-4-methoxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2-hydroxy-4-methoxy-
5-sulfobenzophenone and the like can be mentioned.

The effective absorption wavelength of salicylic acid is about 290
At 330 nm, typical examples are phenyl salicylate,
Examples thereof include pt-butylphenyl salicylate and p-octylphenyl salicylate.

The effective absorption wavelength of the cyanoacrylate type is about 270-350 nm, and typical examples are 2-ethylhexyl-2-cyano-3,3-diphenylacrylate,
Ethyl-2-cyano-3,3-diphenylacrylate and the like can be mentioned. These UV absorbers may cause a problem of bleed-out when, for example, a thermoplastic resin is melt-molded. Therefore, ADK STAB LA-31
As described above, it is desirable that the ultraviolet absorber is dimerized via methylene and has a large molecular weight. These UV absorbers can be used alone or in combination of two or more.
The preferred amount of addition varies depending on the thickness of the molded product, the properties of the optical brightener, and the like, and cannot be unambiguously determined. However, those skilled in the art can easily determine the amount by performing some tests. . Generally, for a molded product having a thickness of 1 mm, 0.1 to 30% by mass is sufficient.

As described above, the use of a fluorescent whitening agent alone or in combination with an ultraviolet absorber is practically sufficient, but when stricter requirements are required, a small amount of a white pigment having a strong hiding power, for example, titanium oxide (0 (0.05-0.15% by mass). Further, when appearance and color tone become a problem, or according to preference, a minute amount (0.05% or less) of a coloring agent can be blended. It can be considered that the blending amount and the thickness of the added material are almost half proportional.

The method of adding and mixing the above components to the transparent resin is optional. For example, for a transparent thermoplastic resin, a method of mixing the powder, flakes, pellets and the above components sufficiently and then melt-mixing with an extruder is preferable.For a transparent thermoplastic resin, the above components are added to an uncured liquid raw material. It is preferable to add and sufficiently mix and disperse.
At this time, commonly used additives such as a heat stabilizer, an antioxidant, a release agent, an antistatic agent and a flame retardant may be added. The molding can be performed by a commonly used method.
That is, in the case of thermoplastic resin, the coated pipe should be manufactured by the melt extrusion method, the shrink tube should be manufactured by drawing and quenching the pipe obtained by the melt extrusion, and the cover should be manufactured by injection molding, extrusion molding, and if necessary, vacuum forming method. Can be. In the case of a thermosetting resin, casting is convenient.

The fluorescent lamp cover of the present invention is generally composed of a transparent resin, a fluorescent whitening agent, and an ultraviolet absorber, and the thickness thereof is preferably 0.1 mm in the case of a thermoplastic resin molded product.
3 to 10 mm, more preferably 0.5 to 3 mm
Between. In the case of a heat-shrinkable resin, preferably 25 to 2
00μ, more preferably between 50 and 100μ. In the case of casting, it is preferably 0.1 to 50 mm, more preferably 0.5 to 10 mm.

[0066]

Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to the following examples. (Example 1) Methyl methacrylate: styrene = 60: 4
To 0% by mass of the copolymer, 0.10% by mass of the compound of the formula (1) 0.50% by mass ADK STAB LA-31 (trade name, manufactured by Asahi Denka Co., Ltd.) was added, and the mixture was mixed well and pellets were formed by a kneading extruder. Created. The obtained pellets were extruded by a vacuum forming method to obtain a fluorescent lamp sleeve having a thickness of 1 mm and an outer diameter of 38 mm.

Example 2 To a methyl methacrylate polymer was added 0.21% by mass of a compound of the formula (14) 0.11% by mass of ADK STAB LA-31 (trade name, manufactured by Asahi Denka Co., Ltd.) and mixed well. Pellets were prepared with a kneading extruder. The obtained pellets were extruded by a vacuum forming method to obtain a fluorescent lamp sleeve having a thickness of 1 mm and an outer diameter of 38 mm.

Example 3 Compound (14) 2.1% by mass ADK STAB LA-31 (manufactured by Asahi Denka, trade name) 1.1% by mass was added to polyethylene terephthalate for heat shrinkage, and pellets were formed in the same manner as in Example 1. Created. A heat-shrinkable tube was prepared from the obtained pellets by a melt extrusion method. The thickness of the tube was adjusted to 100 μm after heat shrinkage. This heat-shrinkable tube was covered with a commercially available broad-band light-emitting type and three-wavelength light-emitting daylight fluorescent lamp and heated at 120 ° C. for 1 minute to coat. (Example 4) A fluorescent lamp sleeve was obtained in the same manner as in Example 1 except that the compound of the formula (1) was replaced by 0.21% by mass of the compound of the formula (14).

(Comparative Example) To a methyl methacrylate polymer was added 0.51% by mass of a compound of the formula (1) 0.11% by mass of ADK STAB LA-31 (trade name, manufactured by Asahi Denka Co., Ltd.), mixed well, and kneaded. Pellets were prepared with an extruder. The obtained pellets were extruded by a vacuum forming method to obtain a fluorescent lamp sleeve having a thickness of 1 mm and an outer diameter of 38 mm.

The molded article and the tube of Example 3 (before coating with a fluorescent lamp) were exposed to a sunshine weather meter for 500 hours without rainfall, and the degree of discoloration was visually evaluated. The results shown in Table 1 below were obtained. Obtained.

[Table 1]

The absorption spectra of the molded products obtained in Examples 1 and 2 were measured. As a result, a commercial product as a comparative example,
Although it absorbs light up to 410 nm, which is a longer wavelength than 3M ISCLARL (trade name) and Lintec Optron Clear (trade name), it was possible to obtain a highly transparent ultraviolet absorbing film without yellowish color ( (See FIG. 1). Further, the tube obtained in Example 3 and the molded product obtained in Example 4 also showed the same results as described above.

[0072]

The ultraviolet-absorbing fluorescent lamp cover obtained according to the present invention has no yellowish tint, high transparency, and no coloration in transmitted light. Showcase fluorescent lamps, vending machine fluorescent lamps and front acrylic plates, photographs, photographs with fluorescent lamps as backlights (eg, Fuji Photo Film Co., Ltd. product G
Color), even when used for a product such as a liquid crystal display where there is concern about fading, the natural color inherent to the article is not impaired.
In addition, since ultraviolet rays generated from lighting equipment such as a fluorescent lamp are not leaked to the outside, it is possible to prevent inviting flying insects. An object of the present invention is to block ultraviolet rays generated from a fluorescent lamp, but similarly, a light source other than a fluorescent lamp that generates ultraviolet rays,
For example, the present invention can be applied to lighting equipment such as an incandescent lamp, a halogen bulb, and a mercury lamp.

[Brief description of the drawings]

FIG. 1 is a graph showing ultraviolet absorption spectra of Examples 1 and 2 and commercial products.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // A01G 7/00 601 A01G 7/00 601C C09B 57/00 C09B 57/00 Y (72) Inventor Sato Tadahisa 210, Nakanuma, Minamiashigara, Kanagawa Prefecture Fuji Photo Film Co., Ltd. (72) Inventor Kazuyoshi Yamakawa 210, Nakanuma, Minamiashigara, Kanagawa Prefecture, Fuji Photo Film Co., Ltd. F term (reference) 2B022 AA01 DA09 4H056 DD23 EA14 FA02 4J002 AC031 AC061 AC091 BB031 BB121 BB171 BC031 BC071 BC081 BC111 BC121 BD041 BD101 BE041 BE051 BF011 BF021 BG041 BG051 BG101 BG131 BH021 BJ001 BK001 CD191 CF041 CK021 CL011 CL031 EU226 FD206 GQ00

Claims (5)

[Claims] 1. A transparent resin containing an optical brightener at 410 nm
A transparent fluorescent lamp cover characterized in that the following light is cut by 90% or more. 2. The fluorescent whitening agent is represented by the following general formula (I).
The fluorescent lamp cover according to claim 1, wherein the fluorescent lamp cover is provided. Embedded image(Where R₁And R_FourIs a hydrogen atom, an alkyl group or
Represents an alkoxy group; _TwoAnd R_ThreeRepresents an alkyl group
And (A) represents a substituted aryl or substituted ethenyl group.
You. ) 3. A compound represented by the general formula (I):
A compound represented by the general formula (II):
The fluorescent lamp cover according to claim 1 or 2, wherein: Embedded image(Where R_FiveAnd R₇Is R_TwoIs a group equivalent to
R₆And R₈Is R _ThreeAnd n is 1 or more.
Or an integer of 2. ) 4. The fluorescent lamp cover according to claim 1, wherein the transparent resin is a copolymer of methyl methacrylate: styrene = 1: 99% by mass to 99: 1% by mass. . 5. A lighting device in which a fluorescent lamp cover according to any one of claims 1 to 4 is covered with a fluorescent lamp of a broadband emission type or a three wavelength range emission type so as to cut off light of 410 nm or less.