JP5888788B2 - Linear illuminant and method for producing the same - Google Patents

Description

The present invention is an improvement of the linear light emitter, more specifically, not only can the attachment work to the fixed object be easily performed, but also the light emission performance at the time of use is excellent, and the production can be performed efficiently. The present invention relates to a linear light emitter and a manufacturing method thereof .

  As is well known, most of the illuminations and signboards you see in town use a linear light emitter such as a neon light, but a neon light that consists of a glass tube is flexible. Therefore, it is not possible to bend the light-emitting body along the curved portion of the mounting surface, or to form an arbitrary picture or character.

  Therefore, in the past, a flexible optical fiber type linear light emitter has also been developed so that the linear linear light emitter can be freely curved and used. A patent application has been filed for a linear light emitter comprising a core layer made of an acrylic resin and a clad layer made of a translucent fluororesin (see Patent Document 1).

  Further, as described in FIG. 6 in the above-mentioned document 1, the applicant of the present invention provides light emission by providing a light reflecting layer made of a white or silver opaque resin outside the cladding layer of the linear light emitter. We have also developed a linear illuminator with excellent light emitting performance that can brighten the surface (peripheral surface where no light reflection layer is formed) to a position far from the light source.

  However, in the linear light emitter having the light reflecting layer, although the fluorine resin is used for both layers so that the clad layer and the light reflecting layer are bonded, the light made of the non-adhesive fluorine resin is used. Since it was not possible to directly apply the double-sided tape or to apply the adhesive on the reflective layer, it was necessary to attach the linear light emitter using a fitting structure or a locking structure.

  In addition, in order to provide an adhesive layer on the outer peripheral surface of the linear light emitter, a method of providing a primer layer having adhesion to both the fluororesin and the non-fluorine adhesive between the light reflecting layer and the adhesive layer is also considered. However, if this method is adopted, a step of applying a primer to the outside of the light reflection layer must be included during the production, which easily deteriorates the production efficiency.

  On the other hand, conventionally, a fluorine resin material introduced with a functional group that imparts adhesion to a non-fluorine resin, a hose material produced by bonding and laminating this fluorine resin to a non-fluorine resin, etc. are also known. However (see Patent Documents 2 and 3), no technology has been found in the past in which a linear luminous body is provided with an adhesive layer while taking advantage of the optical properties of a fluororesin.

JP 2013-57924 A JP 2003-231718 A Japanese Patent Laid-Open No. 10-311461

Therefore, the present invention has been made in view of the problems as described above, and the purpose thereof is not only easy to attach to an object to be fixed, but also excellent in luminous performance during use, And it is providing the linear light-emitting body which can also manufacture efficiently, and its manufacturing method .

  Means employed by the present inventor to solve the above problems are as follows.

That is, the present invention is a rod-shaped body made of a transparent acrylic resin, a core layer 1 having a refractive index larger than that of air; and a sheath body made of a translucent resin material covering the core layer 1, A cladding layer 2 having a refractive index smaller than that of the core layer 1 and having a refractive index larger than that of air; and a light reflecting layer 3 integrally formed outside the cladding layer 2 on the outer peripheral surface without an adhesive layer. And a fluorine system in which a functional group for imparting adhesion to a polyamide-based resin is introduced into the clad layer 2 while including an adhesive layer 4 provided outside the light reflecting layer 3. The light emitter main body R is characterized in that a resin is used and a polyamide-based resin is used for the light reflecting layer 3 and the adhesive layer 4 is directly provided on the light reflecting layer 3.

  The adhesive layer 4 can be formed by adhering a double-sided tape 41 on the light reflecting layer 3. The double-sided tape 41 is coated with an acrylic pressure-sensitive adhesive having excellent heat resistance. It can be preferably used.

  In addition, regarding the fluorine-based resin used for the cladding layer 2, a material excellent in optical properties and adhesiveness with a non-fluorine-based resin can be selected and used. The introduced copolymer of hexafluoropropylene, tetrafluoroethylene and ethylene can be preferably used. In addition, when selecting this fluororesin, it is preferable to use what introduce | transduced the at least 1 sort (s) of functional group selected from the carboxyl group and carboxylate.

  On the other hand, the fluororesin used for the cladding layer 2 contains a copolymer of ethylene and tetrafluoroethylene, a bondable group capable of grafting with the copolymer, and a functional group imparting adhesiveness. What was manufactured by grafting a grafting compound can also be used. In that case, it is preferable to use those into which at least one functional group selected from a carboxyl group, a carboxylic anhydride residue, an epoxy group and a hydrolyzable silyl group is introduced.

  Further, the core layer 1 and the cladding layer 2 are formed into a semicircular cross section, a semielliptical cross section, a cross sectional fan shape, or a rectangular cross section having a flat portion on a part of the outer peripheral surface, By providing the light reflecting layer 3 so as to cover the flat portion and further providing the adhesive layer 4 on the outer side thereof, the light emitter body R can be easily bent, so that the attachment to the fixed object can be further facilitated. it can.

In addition, when the linear light emitter is manufactured, if the core layer 1, the clad layer 2 and the light reflecting layer 3 are integrally formed by coextrusion molding, manufacturing can be efficiently performed even in mass production. Is possible.

On the other hand, in the present invention, instead of adopting the configuration of the light emitter main body R, the clad layer 2 uses a fluorine-based resin, and the light reflecting layer 3 has a polyolefin-based adhesive having adhesiveness with the fluorine-based resin. It is also possible to adopt a configuration in which the light reflecting layer 3 and the adhesive layer 4 are directly integrated without using a primer layer by using a polymer .

  In the present invention, in a plastic linear light-emitting body having a light reflecting layer outside the cladding layer, a special fluorine resin having adhesiveness with a non-fluorine resin is adopted for the cladding layer, and the light reflecting layer By using a non-fluorine-based resin having adhesiveness as a base material, a double-sided tape or an adhesive can be directly attached or applied to the outside of the light reflecting layer.

  In addition, since the adhesive layer is formed as described above, the linear light-emitting body can be easily attached by being adhered to the object to be fixed, and therefore, the attaching operation to the object to be fixed can be facilitated. In the present invention, since it is not necessary to provide a primer layer between the light reflecting layer and the adhesive layer, there is no fear that the manufacturing process is complicated and the manufacturing efficiency is lowered.

  In addition, since the said light reflection layer uses the fluorine-type resin of a clad layer and non-fluorine-type resin with favorable adhesiveness, the delamination of a clad layer and a light reflection layer can also be prevented. In addition, if the light reflecting layer is colored white or the like, the optical properties of the base resin do not significantly affect the light emission performance, so that the light emission performance is degraded by the use of non-fluorinated resins. Nor.

  On the other hand, instead of employing a special fluorine-based resin for the cladding layer, a polyolefin-based adhesive polymer having excellent adhesion to the fluorine-based resin can be used for the light reflecting layer. Even when this structure is adopted, the adhesive layer can be directly provided without providing the primer layer outside the light reflecting layer, so that the same effect as described above can be obtained.

  Therefore, according to the present invention, not only good light emission performance can be obtained by utilizing the optical properties of the fluorine-based resin, but also the adhesive layer of the linear light emitter can be easily attached to the surface of the fixed object during use. Since the linear light-emitting body excellent in practicality that can be fixed can be provided, the practical utility value of the present invention is very high.

It is the whole perspective view and end part enlarged view showing the structure of the linear light-emitting body in Example 1 of this invention.

“Example 1”
A first embodiment of the present invention will be described with reference to FIG. In the figure, what is indicated by reference numeral 1 is a core layer, and what is indicated by reference numeral 2 is a cladding layer. What is indicated by reference numeral 3 is a light reflecting layer, and what is indicated by reference numeral 4 is an adhesive layer.

[Configuration of linear light emitter]
First, in Example 1, a core layer 1 (a rod-shaped body made of a transparent resin material) is provided as a light guide portion of the light emitter body R, and a cladding layer 2 having a thickness of 0.2 mm as a light emitter is provided outside the core layer 1. (Sheath body made of translucent resin material) is provided (see FIG. 1). In this embodiment, polymethyl methacrylate (PMMA) having excellent transparency is used as the material of the core layer 1.

  Furthermore, the cladding layer 2 is made of a functional group-introduced copolymer of hexafluoropropylene, tetrafluoroethylene, and ethylene (EFEP). The semitransparent clad layer 2 is formed by adding 0.2 wt% as particles. In addition, as a functional group introduce | transduced into the said fluororesin, at least 1 type of functional group chosen from a carboxyl group and carboxylate can be selected.

  The core layer 1 has an optical property of a refractive index of 1.49 and a total light transmittance of 93%, and the cladding layer 2 has an optical property of a refractive index of 1.38, a haze value of 88.42%, a total light beam. The transmittance is set to 64.41%. Further, the core layer 1 and the clad layer 2 have a semi-elliptical shape (kamaboko shape) having a cross-sectional shape of 6.0 mm in width and 6.0 mm in height.

  Then, a light reflecting layer 3 made of white opaque resin and having a thickness of 0.3 mm is coated on the flat portion of the outer peripheral surface of the clad layer 2 formed so as to have a semi-elliptical cross section. Provided. The base resin of the light reflecting layer 3 is a polyamide resin having good adhesiveness with the fluorine resin of the cladding layer 2.

  In the light reflecting layer 3, titanium dioxide is added to 1.0 wt% resin. And when the light-emitting body R provided with the light reflection layer 3 was set in a light source (LED) and the light emission performance (light emission amount and light emission balance) was examined, the one without the light reflection layer 3, the core layer 1 and Better results were obtained than when the light reflecting layer 3 was provided between the cladding layers 2.

  Further, in this embodiment, in the core layer 1, the cladding layer 2, and the light reflecting layer 3, an acrylic resin having a molding temperature of 190 to 250 ° C. is formed on the core layer 1, and a molding temperature of 230 to 300 ° C. is formed on the cladding layer 2. Since a fluorine resin is used and a polyamide resin having a molding temperature of 230 to 300 ° C. is used for the light reflecting layer 3, the three layers can be integrally formed by coextrusion molding.

  Further, the adhesive layer 4 is formed on the outer side of the light reflecting layer 3 by directly attaching a double-sided tape 41 having an adhesive applied on both sides of the sheet base material. Thereby, attachment to the to-be-fixed object of the light-emitting body main body R can be made easy. In this embodiment, a double-sided tape 41 in which an acrylic adhesive is applied to a sheet base material made of a foaming resin is used.

  By the way, the double-sided tape 41 coated with the acrylic pressure-sensitive adhesive is excellent in terms of adhesion to metals (aluminum, etc.), plastics (polyamide resin, etc.), glass, wood, as well as heat resistance, weather resistance, and water resistance. However, it is also possible to use a double-sided tape 41 coated with a urethane-based, epoxy-based, or rubber-based (EPDM, silicone, etc.) adhesive other than acrylic.

“Example 2”
Next, Example 2 of the present invention will be described below. In Example 2, the material of the clad layer 2 is combined with a copolymer of ethylene and tetrafluoroethylene (ETFE), a bondable group that can be grafted with this copolymer, and a functional group that imparts adhesiveness. The fluororesin produced by grafting the grafting compound containing it was used, and other configurations were the same as in Example 1. As a result, as in Example 1, the clad layer 2 made of the fluororesin and the light reflecting layer 3 made of the polyamide resin could be firmly bonded.

  In addition, regarding ETFE used for the cladding layer 1, a carboxyl group or a carboxylic acid anhydride residue (two carboxyl groups in one molecule are dehydrated and condensed as a functional group imparting adhesiveness to a non-fluorine resin. Residues), carbonate groups, carbonyl fluoride groups, epoxy groups, hydroxyl groups, isocyanate groups, ester groups, acid amide groups, aldehyde groups, amino groups, hydrolyzable silyl groups, and cyano groups. Those in which a group is introduced can be used.

  Among the above functional groups, ETFE into which at least one functional group selected from a carboxyl group, a carboxylic acid anhydride residue, an epoxy group, a hydrolyzable silyl group, and a cyano group is introduced is adopted. Is preferred.

  Furthermore, regarding the binding group introduced into the ETFE, an unsaturated or saturated hydrocarbon group involved in radical association or addition, an amino group or phenolic hydroxyl group involved in nucleophilic reaction, and the like can be employed. In addition, a peroxin group, an azo group, or the like, which is a group that easily generates radicals, can be used. Ideally, a group having a carbon-carbon unsaturated bond (in particular, an organic group having an α or β unsaturated double bond at the terminal), a peroxin group, or an amino group is preferable.

  In addition, as the grafting compound to be grafted onto the ETFE, unsaturated polycarboxylic acid anhydride, unsaturated carboxylic acid, epoxy group-containing unsaturated compound, hydrolyzable silyl group-containing unsaturated compound, epoxy group-containing peroxin compound, etc. Is preferred.

  The unsaturated polycarboxylic acid anhydride includes maleic anhydride, itaconic acid anhydride, citraconic acid anhydride, bicyclo [2.2.1] hept-2-ene-5,6-dicarboxylic acid anhydride, and the like. There is. Unsaturated carboxylic acids include acrylic acid, methacrylic acid, maleic acid, maleic acid monomethyl ester, fumaric acid, itaconic acid, citraconic acid, crotonic acid, and bicyclo [2.2.1] hept-2-ene-5. , 6-dicarboxylic acid anhydride.

  Examples of the epoxy group-containing unsaturated compound include glycidyl acrylate, glycidyl methacrylate, and acriglycidyl ether. In addition, as the hydrolyzable silyl group-containing unsaturated compound, one unsaturated group-containing organic group such as vinyl group, allyl group, methacryloyloxyalkyl group, acryloyloxyalkyl group, and hydrolyzed alkoxy group or acyl group. A compound in which 2 to 3 decomposable groups are bonded to a silicon atom is preferred. In particular, when one unsaturated group-containing organic group and at least one, preferably 2-3 hydrolyzable groups are bonded to a silicon atom, the remaining groups are lower alkyl groups such as methyl groups. Is preferred.

  Specific examples of the hydrolyzable silyl group-containing unsaturated compound include vinyltrimethoxysilane, vinyltriethoxysilane, vinyltriacetoxysilane, and vinyltris (β-methoxyethoxy) silane.

  The peroxin compounds include diacyl peroxides, ketone peroxides, hydroperoxides, hydroperoxides, peroxycarbonates and the like. The peroxin compound is preferably a polymer-type graft compound.

“Example 3”
Next, Example 3 of the present invention will be described below. In Example 3, ETFE in which no functional group is introduced into the clad layer 2 is used, and a polyolefin-based adhesive polymer having adhesion to the fluororesin of the clad layer 2 is used as the light reflecting layer 3 (this example). Then, by using “Bond First (registered trademark)” manufactured by Sumitomo Chemical Co., Ltd., the light reflecting layer 3 and the adhesive layer 4 are directly integrated without a primer layer.

  Even when the above configuration is adopted, since the clad layer 2 and the light reflecting layer 3 and the light reflecting layer 3 and the adhesive layer 4 are firmly bonded, there is no fear of delamination, and the adhesive layer 3 is fixed. The light emitter body R can be easily attached to the object. In this embodiment, an adhesive is applied to the surface of the light reflecting layer 3 to form the adhesive layer 4. However, an epoxy, acrylic, urethane, rubber or the like can be used as the adhesive. .

[Peeling test of linear light emitter]
Next, the result of the peeling test performed using the linear light emitters of Examples 1 to 3 will be described below. In this peeling test, the linear light emitters of Examples 1 to 3 were attached to a substrate made of ABS resin, and the linear light emitter was pulled vertically upward in a state where the substrate was fixed to a surface plate of a universal testing machine. The adhesion strength between the substrate and the linear light emitter was visually confirmed. The peel test conditions were as follows: test speed (lifting speed): 200 mm / min, test atmosphere temperature and humidity: 23 ± 2 ° C., 50 ± 10% RH.

  As a result, it was confirmed that both the linear light emitters of Examples 1 to 3 had a peel strength of 20 N or more, and sufficient adhesive strength was obtained. In addition, in order to compare with these linear light emitters, a peel test was also conducted on a linear light emitter using a general fluororesin for the light reflecting layer 3, but a double-sided tape was applied to the light reflecting layer 3. The alignment itself was not possible.

  The present invention is generally configured as described above. However, the present invention is not limited to the described embodiments, and various modifications can be made within the description of “Claims”. 1, an acrylic resin having a refractive index of 1.45 to 1.60 having a refractive index larger than that of air can be used. Not only polymethyl methacrylate, but also polyethyl methacrylate, poly-n-butyl methacrylate, poly-isobutyl methacrylate, Examples thereof include poly (t-butyl methacrylate) and poly (2-ethylhexyl methacrylate). In this case, the material is selected so that the refractive index difference with the cladding layer 2 is 0.01 to 0.15.

  The clad layer 2 can also be made of a fluorine resin having a refractive index of 1.35 to 1.45, which is lower than that of the core layer 1 and higher than that of air. Other than EFEP and ETFE into which a functional group imparting adhesiveness to a fluororesin is introduced can also be used. In addition, when using a polyolefin-type adhesive polymer for the light reflection layer 3, the fluorine resin in which the functional group is not introduce | transduced can also be selected.

  In addition, if the maximum thickness of the cladding layer 2 is in the range of 0.05 to 1.0 mm, both the total light transmittance and the haze ratio can be achieved. In this case, the total light transmittance of the cladding layer 2 is 60% or more. If the haze value is 20% to 90%, well-balanced side light emission can be obtained.

  Furthermore, in the cladding layer 2, a multilayer structure can be adopted, and metal particles such as titanium dioxide and silica particles, which are light scattering particles, or non-metallic inorganic particles can be added to the resin of the outer layer. Further, the clad layer 2 can be composed of three or more resin layers including an inner layer and an outer layer.

  On the other hand, the cross-sectional shapes of the core layer 1 and the clad layer 2 may be, for example, a semicircular cross-section, a cross-sectional fan shape, or a cross-section, as long as the cross-sectional shape is not semi-elliptical as long as it has a flat portion on a part of the outer peripheral surface. You may shape | mold in a rectangular shape. In that case, the light reflecting layer 3 is provided so as to cover the flat portion of the clad layer 2, and the adhesive layer 4 is further formed outside thereof.

  The light reflecting layer 3 can be formed of a white or silver opaque resin material. When a fluororesin having a functional group introduced into the cladding layer 2 is used, A non-fluorine resin having reactivity can be freely selected and used. Further, as the polyolefin-based adhesive polymer used for the light reflecting layer 3, those other than those used in the examples can be used, and any of them belongs to the technical scope of the present invention.

  In recent years, the introduction of LEDs has been progressing in illuminations, illumination signboards, etc. Under such circumstances, the linear light emitter of the present invention can emit light linearly only by setting one LED at the end. In addition, since it is a useful technology with excellent light emission performance and ease of use, its industrial utility value is very high.

1 Core layer 2 Cladding layer 3 Light reflecting layer 4 Adhesive layer
41 Double sided tape R Light emitter body

Claims (10)

A rod-shaped body made of a transparent acrylic resin , having a core layer (1) having a refractive index larger than that of air; and a sheath body made of a translucent resin material covering the core layer (1), the core layer A cladding layer (2) having a refractive index smaller than that of (1) and a refractive index larger than that of air; and a light reflecting layer (3) partially formed on the outer peripheral surface of the cladding layer (2); An adhesive layer (4) provided outside the light reflecting layer (3);
Further, a fluorine resin in which a functional group imparting adhesiveness to the polyamide resin is used for the cladding layer (2), and a polyamide resin is used for the light reflecting layer (3). The linear light emitter is characterized in that the adhesive layer (4) is directly provided on the light reflecting layer (3).   The linear light-emitting body according to claim 1, wherein the fluororesin used for the clad layer (2) is a copolymer of hexafluoropropylene, tetrafluoroethylene and ethylene into which a functional group is introduced.   The linear light-emitting body according to claim 2, wherein at least one functional group selected from a carboxyl group and a carboxylate is introduced into the fluororesin used for the clad layer (2). Graftability in which the fluororesin used for the clad layer (2) includes a copolymer of ethylene and tetrafluoroethylene, a bondable group capable of grafting, and a functional group imparting adhesiveness. linear light-emitting body according to claim 1, wherein the compound is characterized in that grafted.   It is characterized in that at least one functional group selected from a carboxyl group, a carboxylic anhydride residue, an epoxy group and a hydrolyzable silyl group is introduced into the fluororesin used for the clad layer (2). The linear light-emitting body according to claim 4. A rod-shaped body made of a transparent acrylic resin , having a core layer (1) having a refractive index larger than that of air; and a sheath body made of a translucent resin material covering the core layer (1), the core layer A cladding layer (2) having a refractive index smaller than that of (1) and a refractive index larger than that of air; and a light reflecting layer (3) partially formed on the outer peripheral surface of the cladding layer (2); An adhesive layer (4) provided outside the light reflecting layer (3);
Further , a fluorine-based resin is used for the cladding layer (2), and a polyolefin-based adhesive polymer having adhesiveness with the fluorine-based resin is used for the light reflecting layer (3). linear light emitters adhesive layer (4) is characterized in that characterized in that provided directly 3) above.   The linear light emitter according to any one of claims 1 to 6, wherein an adhesive layer (4) is formed by adhering a double-sided tape (41) on the light reflecting layer (3). The linear light-emitting body according to claim 7 , wherein an acrylic adhesive is used for the double-sided tape (41).   The core layer (1) and the clad layer (2) are formed into a semicircular cross section, a semielliptical cross section, a cross sectional fan shape, or a rectangular cross section having a flat portion at a part of the outer peripheral surface, and the clad layer (2 The light reflecting layer (3) is provided so as to cover the flat portion of the substrate), and the adhesive layer (4) is further formed on the outer side of the light reflecting layer (3). Linear light emitter. The method of manufacturing a linear light emitter according to claim 1 or 6, wherein the core layer (1), the clad layer (2) and the light reflecting layer (3) are integrally formed by coextrusion molding. A method for manufacturing a linear light emitter.