JPH0625802B2 - Fluorescent lamp UV cut molding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a molded article that cuts light having a wavelength of about 410 nm or less contained in the light of a fluorescent lamp, and more specifically, a transparent resin containing a specific compound. The present invention relates to a molded article that cuts light having a wavelength of about 410 nm or less by transmitting light from a fluorescent lamp to the layer.

<Prior Art> A white fluorescent lamp, which is a typical fluorescent lamp, emits strong light having peaks at wavelengths of about 365 nm and about 405 nm in a wavelength region of about 410 nm or less. These lights have a problem that, for example, the products displayed in the show window may be discolored or deteriorated, and that they may cause a trouble in handling the UV curable resin, for example. There is a strong demand. In order to solve these problems, a method of providing an ultraviolet ray blocking layer on the inner surface of the fluorescent lamp has been conventionally used, but it was troublesome to manufacture and to use. Also,
A method of coating a fluorescent lamp with a resin containing a so-called UV absorber or covering a tube or pipe of such a resin can be considered.With the UV absorber, light with a wavelength centered around 365 nm can be cut, but Since the wavelength of 405 nm cannot be sufficiently cut, it could be used in a show window, but it was not suitable for handling UV curable resin.

<Object of the Invention> An object of the present invention is to provide a molded article for cutting light having a wavelength of about 140 nm or less contained in the light of a fluorescent lamp.

<Structure of the Invention> The present invention is a molded article comprising a transparent resin layer that transmits light emitted from a fluorescent lamp and cuts ultraviolet rays, wherein the transparent resin layer has the formula (1) and / or the formula (1) 2) Containing a compound represented by
(% By weight), when the thickness of the transparent resin layer is represented by t (μm), the molding for fluorescent lamp ultraviolet ray cutting, which satisfies the formula (3) 10 ≦ C × t ≦ 60 (3) It relates to the product.

Examples of the transparent resin used in the method of the present invention include not only thermoplastic resins such as acrylic resin, vinyl chloride resin, styrene resin, transparent polyester resin, transparent polyamide resin and polycarbonate resin, but also unsaturated polyester resin, epoxy resin, It also includes thermosetting resins such as thermosetting polycarbonate resin (CR-39). The transparent resin layer is
Specifically, for example, a film winding film by painting, a shrink tube, a covered pipe, a cover sheet, etc.,
The thickness is not particularly limited, but usually 0.05 to 3 mm is preferable.

Examples of the compound represented by the formula (1) and / or (2) include HOTHA PERM YELLOW H4G (trade name), a colorant manufactured by Hoechst. This is a yellow organic pigment with a melting point of about 377 ° C, which has excellent heat resistance and can be added to polyester resin, polycarbonate resin, etc.
It does not cause thermal decomposition even when heated to ℃. In addition, since it has maximum absorption at wavelengths of about 270 nm and about 370 nm, it absorbs light of wavelengths of about 365 nm and about 405 nm of a fluorescent lamp very effectively. Concentration of the compound in the transparent resin layer (C wt%)
Depends on the thickness (tμm) of the transparent resin layer, and it is necessary to satisfy the formula (3), that is, 10 ≦ C × t ≦ 60, and more preferably 15 ≦ C × t ≦ 40. For example, if the thickness is 100 μm, the concentration is 0.1-0.6% by weight, if the thickness is 200 μm, the concentration is 0.05-0.3% by weight, and if the thickness is 2000 μm, the concentration is
It is required to be 0.005 to 0.03% by weight.

When only the compound is added to the transparent resin, Cxt is preferably about 30 or more, and when other additives are used in combination, Cxt within the range of the formula (3) is preferable. t
The value of can be easily obtained by experiment. If the concentration is too low, light of the above wavelengths will be transmitted,
Unsuitable for the purposes of the invention. Further, when the concentration is too high, the light of the above wavelength is not transmitted, but the light transmittance is significantly reduced. The method of adding and mixing the compound to the transparent resin is arbitrary. For example, in a coating material, a method of dispersing and dissolving in a solvent and mixing, a method of melting and kneading for a thermoplastic resin, a method of dispersing and dissolving for a thermosetting resin are preferable. At this time, commonly used additives such as heat stabilizers, antioxidants, ultraviolet absorbers, flame retardants, and coloring agents may be added.

Molding can be performed by any method that is usually performed. For example, the coating film is prepared by dissolving a transparent resin containing the compound in an appropriate solvent and coating it on a fluorescent lamp. The winding film is melt extruded, and the shrink tube is melt extruded. Thus, the coated pipe can be manufactured by melt extrusion, and the cover can be manufactured by injection molding or extrusion molding, and if necessary, vacuum molding.

<Effects of the Invention> The molded article of the present invention is directly attached to a fluorescent lamp or used as an accessory. By using the molded article of the present invention, the light of the wavelength of about 410 nm or less emitted from the fluorescent lamp is completely cut off, so that the color of the illuminated object becomes slightly yellowish, but it does not matter. Is about
It can be suitably used for lighting of show windows that display products and lighting of workplaces that handle UV curable resins.

<Examples> The present invention will be described in detail below with reference to Examples.

Example 1 HOSTA PERM YELLOW H4G was added to a modified polyethylene terephthalate resin copolymerized with a small amount of neopentyl glycol.
The mixture was mixed so as to have a concentration of 0.25% by weight, extruded at about 290 ° C., and biaxially stretched to obtain a film having a thickness of 160 μm. The light transmittance of this film in the wavelength range of 300 to 600 nm was measured by a Tsushima double beam spectrophotometer UV-200, and the transmittance in the range of 340 to 410 nm was 0%.

Example 2 100 parts by weight of the same modified polyethylene terephthalate resin as used in Example 1, 0.2 parts by weight of titanium oxide, HOSTA PE
RM YELLOW H4G 0.1 parts by weight and Color Index Solvent Yellow 113 0.85 parts by weight are mixed, extruded at about 290 ° C and then stretched at about 90 ° C to obtain a shrink tube with a wall thickness of 137 μm and a circumferential shrinkage of 34%. It was This was covered with a white fluorescent lamp and heated to bring the tube into close contact with the lamp (coating thickness: about 166 μm). When this coated lamp was turned on and the relative intensity of light was measured in the wavelength range of 300 to 600 nm, the intensity at wavelengths below about 490 nm was zero.

For comparison, when the HOSTA PERM YELLOW H4G was removed, the same operation was carried out. As a result, the presence of transmitted light in the range of 320 to 420 nm was observed with a wavelength of 400 nm as a peak.

Example 3 In place of Color Index Solvent Yellow 113 in Example 2, Olaset Yellow GHS (manufactured by Ciba Geigy), Plast Yellow DY-142 (manufactured by Ariki Chemical Industry) or Plast Yellow 8020 (manufactured by Ariki Chemical Industry). The same results were obtained by the same procedure as in Example 2 except that was used.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ichizo Terado 10532-2 Hiromachi, Kure City, Hiroshima Prefecture (72) Inventor Seiki Mukai 1241 Hiromachi, Kure City, Hiroshima Prefecture (56) References Japanese Patent Laid-Open No. 61- 126503 (JP, A) Actual development Sho 57-82003 (JP, U)

Claims (1)

[Claims] 1. A molded article comprising a transparent resin layer which transmits light emitted from a fluorescent lamp and cuts ultraviolet rays, wherein the transparent resin layer has the formula (1) and / or the formula (2). Containing a compound represented by
(% By weight), when the thickness of the transparent resin layer is represented by t (μm), the molding for fluorescent lamp ultraviolet ray cutting, which satisfies the formula (3) 10 ≦ C × t ≦ 60 (3) Goods.