WO2011030858A1 - 集光フィルム並びにその製造方法、集光素子、太陽電池、及び集光方法 - Google Patents
集光フィルム並びにその製造方法、集光素子、太陽電池、及び集光方法 Download PDFInfo
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- WO2011030858A1 WO2011030858A1 PCT/JP2010/065636 JP2010065636W WO2011030858A1 WO 2011030858 A1 WO2011030858 A1 WO 2011030858A1 JP 2010065636 W JP2010065636 W JP 2010065636W WO 2011030858 A1 WO2011030858 A1 WO 2011030858A1
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- G03H1/08—Synthesising holograms, i.e. holograms synthesized from objects or objects from holograms
- G03H1/0841—Encoding method mapping the synthesized field into a restricted set of values representative of the modulator parameters, e.g. detour phase coding
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- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
Definitions
- the present invention relates to a light collecting film and a method for manufacturing the same, a light collecting element including the light collecting film, a solar cell including the light collecting element, and a light collecting method using the light collecting film.
- solar power generation is targeted for power generation costs comparable to general-purpose power, and development of solar cells that can reduce module manufacturing costs and have high power generation efficiency is required.
- optical members for condensing include (1) lenses (spherical and aspherical types), (2) concave mirrors, and (3) flat films.
- an optical element using a hologram is also known.
- a hologram produced by laser imprinting a hologram diffraction pattern on a photosensitive material.
- Such a hologram diffraction pattern is formed by recording interference fringes between a reference beam such as a laser beam and an object beam on a photosensitive material surface of a photosensitive material such as dichromated gelatin, and the complex amplitude of the object beam.
- the method of optically fixing the information on the recording surface is used.
- the photosensitive material described above lacks durability (moisture resistance, weather resistance), when a planar film having this hologram diffraction pattern is used for a solar battery, it is to be mounted inside the solar battery cell, For example, the internal total reflection solar cell as disclosed in Non-Patent Document 1 is used, and thus the light is not condensed (omnidirectional condensing) in a structurally wide angle range.
- a computer generated hologram formed by calculating a diffraction pattern by a computer is proposed instead of a hologram diffraction pattern laser-imprinted on a photosensitive material.
- Patent Document 2 includes at least one first optical system, and a diffraction grating pattern that divides light emitted radially from the first optical system into a plurality of light beams and collects the light beams into a plurality of spots.
- An optical branching device having a formed hologram element and a plurality of second optical systems in which light receiving portions are arranged at positions corresponding to a plurality of spots is disclosed, and an optical phase of a diffraction surface of the hologram element is determined
- Patent Document 3 discloses that a computer generated hologram is calculated using Fourier transform.
- the base material is quartz, and the gradation pattern to be obtained remains on the quartz surface. Not used.
- An object of the present invention is to collect a condensing film capable of condensing incident light in a wide angle range with high efficiency, a condensing element including the condensing film, a solar cell, and incident light in a wide angle range.
- An object of the present invention is to provide a light collecting method capable of collecting light with high efficiency.
- the present invention is a transmissive condensing film made of an organic material, and has a multi-value gradation pattern.
- the present invention also provides a light collecting element comprising the light collecting film.
- the present invention further provides a solar cell comprising the light collecting element.
- the present invention is a method for producing the above light-collecting film, comprising: calculating a multi-value gradation pattern using discrete Fourier transform; and forming a light-condensing film having the multi-value gradation pattern. It is also a manufacturing method of the condensing film characterized by including.
- the present invention is also a condensing method using the condensing film, wherein the light is incident on the surface of the condensing film having the multi-value gradation pattern, and the surface of the condensing film on which the light is incident Includes a step of emitting incident light from the opposite surface.
- the present invention is described in detail below.
- the light collecting film of the present invention is a transmission type light collecting film made of an organic material.
- the “transmission type condensing film” means a condensing film that emits light incident on one surface of the condensing film from a surface opposite to the surface on which the light is incident.
- the condensing film of the present invention has a multi-value gradation pattern. By having a multi-value gradation pattern, in-plane light collection in a wide angle range is possible.
- the multi-value gradation pattern is a pattern called a computer multi-value hologram grating pattern or the like.
- the multi-value gradation pattern preferably constitutes a computer generated hologram. That is, the condensing film of the present invention preferably includes a computer generated hologram having a multi-value gradation pattern. Since a computer generated hologram is not formed by forming interference fringes between the reference beam and the object beam, it is not necessary to use a photosensitive material as a material for forming a light-collecting film, and a durable hologram is formed. be able to.
- a “multi-value gradation pattern” is a pattern having a multi-value gradation calculated by a computer. “Multi-value gradation” means a gradation having a value of 3 or more, and is distinguished from a binary gradation.
- gradation means the degree of change in the film thickness of the condensing film.
- a condensing film having a multi-value gradation pattern has three or more thickness values.
- the multi-value gradation pattern is preferably a pattern formed by combining two or more concave portions having different depths.
- the shape of the recess when the multi-value gradation pattern is viewed in plan may be a quadrilateral as shown in FIG. 9 (a), a round shape as shown in FIG. 9 (b), It may be oval or the like as shown in 9 (e).
- those concave portions may be present independently or continuously connected.
- the shape when viewed in cross section may be a triangle as shown in FIG. 9C, or a semicircular shape or a semi-elliptical shape as shown in FIG. 9D.
- the multi-value gradation pattern is preferably a pattern based on concentric circles, quadrangular pyramids, or triangular pyramids.
- the multi-value gradation pattern preferably has two or more conical, quadrangular pyramid, or triangular pyramid continuous gradation patterns in which the film thickness of the condensing film becomes thin, and the gradation pattern is a grid pattern. It is also preferable that they are connected to each other.
- the gradation pattern in which the film thickness of the condensing film becomes thin in two or more cones, quadrangular pyramids, or triangular pyramids may be continuous over the entire surface.
- the “conical shape, quadrangular pyramid shape, or triangular pyramid shape” may be any shape that can be recognized as a substantially conical shape, a quadrangular pyramid shape, or a triangular pyramid shape.
- the multi-value gradation pattern is preferably a pattern having 4 to 32 gradations.
- the concave portion is a portion where the thickness of the light collecting film is thinner than the maximum thickness of the light collecting film in the region having the multi-value gradation pattern.
- the depth of the recess may be 10% or more of the maximum thickness of the light collecting film in the region having the multi-value gradation pattern.
- L represents the pitch of the recesses
- d represents the depth of the recesses.
- the multi-value gradation pattern is, for example, a pattern configured by combining two or more concave portions having a bottom portion substantially parallel to the in-plane direction of the light collecting film, and the two or more concave portions include at least two concave portions. It is preferable that the depths of the recesses are different.
- the multi-value gradation pattern may be configured by combining at least two concave portions having different depths. You may have two or more recessed parts of the substantially same depth.
- the concave portion usually has a side surface portion that is substantially perpendicular to the in-plane direction of the condensing film, but when a plurality of concave portions are combined to form a multi-value gradation pattern, it is more than the adjacent concave portion. When the depth is small, the side portion may not be provided.
- the multi-value gradation pattern of the light collecting film shown in FIG. 1 is composed of recesses 11a, 11b, 11c, 11d, 11e and 11f, and the maximum thickness is d max in the region having the multi-value gradation pattern.
- the minimum thickness is d min .
- the recess 11 d has a bottom portion 12 and a side surface portion 13. The depth of the recess is appropriately set depending on the material constituting the light collecting film, the size and shape of the light collecting film, and the like.
- the depth of the concave portion is the distance from the surface having the multi-value gradation pattern to the surface on the opposite side, based on the maximum thickness of the light collecting film in the region having the multi-value gradation pattern. refers to, for example, the depth d f of the concave portion 11d in FIG. 1 is the distance represented by d max -d min.
- the depth of the recess is, for example, preferably 0.01 ⁇ m to 100 ⁇ m, and more preferably 0.1 ⁇ m to 30 ⁇ m.
- the light-collecting film preferably has a minimum thickness (d min ) of 25% or less with respect to the maximum thickness (d max ) in a region having a multi-value gradation pattern.
- d min minimum thickness
- d max maximum thickness
- the difference between the maximum thickness and the minimum thickness is large in the multi-value gradation pattern, and thereby a light collecting film with high light collecting efficiency is obtained.
- the ratio of the minimum thickness to the maximum thickness is 50%.
- the “region having a multi-value gradation pattern” means an area where the gradation is formed. For example, when a template is used to form a multi-value gradation pattern as described later, , A region in contact with the region where the reversal pattern of the multi-value gradation pattern of the template is formed.
- the light-collecting film preferably has a multi-value gradation pattern pitch (interval) of 100 ⁇ m or less. More preferably, it is 10 micrometers or less, More preferably, it is 1 micrometer or less.
- the pitch of the multi-value gradation pattern is usually the same as the width of the recess.
- the width of the concave portion is preferably the minimum side length of the quadrilateral when the concave portion in plan view is a quadrilateral, and the width of at least one concave portion may be in the above range.
- Such a preferable form when the shape of the recess when viewed in plan or cross section is a quadrilateral is also suitable when the shape of the recess when viewed in plan is a circle, a triangle, or the like.
- the thickness of the phase hologram is preferably larger than the interval between the interference fringes.
- the thickness of the phase hologram is preferably larger than the interval between the interference fringes.
- it is possible to record and transfer (multiple recording) diffracted light multiple times on the same part. According to this, it can be set as the condensing film excellent in angle selectivity, and it becomes possible to collect incident light of a wide angle range in arbitrary one directions.
- the thickness of the phase hologram is thicker than the interval between the interference fringes, for example, a form in which the depth of the concave portion constituting the multi-value gradation pattern is larger than the width of the concave portion.
- the multi-value gradation pattern is a pattern configured by combining two or more recesses having different depths, and it is preferable that the depth of at least one recess is larger than the width of the recess.
- the end face depth (d a ) of the recess and the width (L) of the recess are expressed by the following formula ( ⁇ ): L / d a ⁇ 2 ( ⁇ ) It is preferable to satisfy.
- the width L f of the concave portion 11d and the end face distance d a in the depth direction (normal direction) of the gradation pattern satisfy L f / d a ⁇ 2.
- the function as an in-plane condensing film which gathers incident light of a wide angle range to arbitrary one directions will be more excellent.
- the recesses constituting the multi-value gradation pattern it is only necessary that the recesses having the minimum width satisfy the formula ( ⁇ ), and it is more preferable that substantially all the recesses satisfy the formula ( ⁇ ).
- the recesses when substantially all of the recesses satisfy the above formula ( ⁇ ), when there is a recess having no side surface, the recess does not satisfy the above formula ( ⁇ ).
- the end surface of the concave portion depth (end face distance) d a represents the length of each stepped end face of the multi-level gradation pattern, the side surface of the recess, the shortest side portion in the direction normal to the light-condensing film (end face) Is the length of
- the multi-value gradation pattern is preferably a pattern calculated using discrete Fourier transform.
- a computer generated hologram calculated using a conventional Fourier transform a large-capacity calculation process is required to calculate a hologram that collects light over a wide angle range. It was not possible to calculate, and the binary hologram was the limit as a computer generated hologram to be used for the light collecting film.
- the discrete Fourier transform it is possible to drastically improve the calculation speed, to calculate a high-quality and large-area computer generated hologram, and to apply the computer generated hologram to the condensing film.
- the discrete Fourier transform can be performed using a Fourier transform device.
- the Fourier transform device is a Fourier transform device that performs discrete Fourier transform on input data at N points (N is an integer of 2 or more), and m sets ( m is an integer greater than or equal to 2) phase correction unit that generates N-point phase correction data, and m sets of N by performing discrete Fourier transform in parallel on the phase correction data generated by the phase correction unit.
- a Fourier transform unit for generating point conversion data and m sets of N point conversion data generated by the Fourier transform unit are combined to generate combined data of L points (L is an integer m times N).
- a phase correction unit that multiplies the input data by a power of a twiddle factor having a period of L points, and generates a phase correction data.
- a rotation factor having a period of N points Powers to perform a discrete Fourier transform of N points using, it is preferred that the Fourier transform device.
- the input data may be set as appropriate so as to obtain the desired characteristics of the condensing film, and is not particularly limited.
- the phase correction unit includes 0th to m ⁇ 1th phase correctors that change the phase of the input data at the N points and operate in parallel with each other, and the qth (q is 0 to m). It is preferable that the phase correction data is generated by multiplying the input data by an integer multiple of q of a twiddle factor having a period of L points.
- the q-th phase corrector is defined by the following equation (A) on the k-th input data x (k) (k is an integer from 0 to N ⁇ 1) among the N-point input data.
- A the k-th input data x (k) (k is an integer from 0 to N ⁇ 1) among the N-point input data.
- B the phase correction data x C (k, q) represented by the following formula (B) to calculate the said Fourier transform unit
- the q-th the For the phase correction data x C (k, q) output from the phase corrector N points based on the following equation (D) using the twiddle factor W N defined by the following equation (C):
- D the twiddle factor
- W N the discrete Fourier transform is executed to generate the N-point converted data X (mp + q) (p is an integer from 0 to N ⁇ 1).
- the Fourier transform device preferably further includes a phase corrector that adjusts the phase of the combined data.
- the Fourier transform unit preferably has a function of executing N-point fast Fourier transform.
- FIG. 7 is a block diagram schematically showing an example of the Fourier transform apparatus.
- the Fourier transform device 75 includes a sampling circuit 70, a phase correction unit 71, a Fourier transform unit 72, a combiner 73, and a phase corrector 74.
- the sampling circuit 70 samples input data x (k) at N points (k is an integer from 0 to N ⁇ 1), and m sets (m is an integer multiple of N) of input data x (k), x (k ,..., X (k) and output to the phase correction unit 71.
- the phase correction unit 71 includes 0th to m ⁇ 1th phase correctors 71 0 to 71 m ⁇ 1 that change the phase of the input data x (k) and operate in parallel with each other.
- the 0th to (m-1) th phase correctors 71 0 to 71 m ⁇ 1 generate phase correction data x C (k, 0) to x C (k, m ⁇ 1), respectively, and perform a Fourier transform.
- the Fourier transform unit 72 includes a plurality of FFT calculators 72 0 to 72 m ⁇ 1 that perform N-point FFT (fast Fourier transform).
- the phase corrector 74 changes the phase of the combined data X (n) by a predetermined amount to generate and output output data.
- a method for executing the calculation using the discrete Fourier transform is described in detail in Japanese Patent Application Laid-Open No. 2004-206254.
- the multi-value gradation pattern can be obtained using an iterative Fourier transform.
- the light collecting film preferably has an average light transmittance of 80% or more at a wavelength of 550 nm incident at an angle of 0 ° to 89 ° with respect to the normal direction of the light collecting film. More preferably, the average is 90% or more, and still more preferably the average is 95% or more.
- the light collection efficiency can be improved by increasing the light transmittance of the organic material forming the light collection film. Moreover, since the deterioration by heat storage etc. can be suppressed by making light transmittance high, it can be used for a long period of time and can be used especially suitably for a solar cell use etc.
- the light transmittance can be measured by a method using an ultraviolet-visible spectrophotometer (U-4100 Spectrophotometer, manufactured by Hitachi Haku Technologies, Ltd.).
- the light collecting film has a light transmittance of a wavelength of 550 nm incident at an angle of 0 ° to 89 ° with respect to the normal direction of the light collecting film, and substantially 80% or more at all angles. preferable. More preferably, it is 90% or more, More preferably, it is 95% or more.
- An angle of 0 ° with respect to the normal direction indicates an angle of the vertical axis
- an angle of 89 ° with respect to the normal direction indicates an angle of 1 ° with the horizontal axis.
- the light transmittance a value obtained by averaging values measured in the range of 0 to 89 ° every 2 ° with the number of measured values can be adopted.
- the light transmittance at a wavelength of 550 nm incident at an angle of 0 to 89 ° with respect to the normal direction of the light-collecting film may be the light transmittance at a wavelength of 550 nm incident on a region having a multi-value gradation pattern. preferable.
- the organic material constituting the light collecting film of the present invention preferably has a refractive index of 1.30 to 1.65 at a wavelength of 350 to 800 nm.
- the upper limit of the refractive index is more preferably 1.60, and still more preferably 1.55.
- the lower limit of the refractive index is more preferably 1.35, and even more preferably 1.40.
- the refractive index can be measured by a method using an Abbe refractometer (Digital thermometer 2T, manufactured by Atago Co., Ltd.). The measurement was performed at 25 ° C., and the light source wavelength was a sodium D line having a 589 nm wavelength.
- thermoplastic resin for example, PMMA (polymethylmethacrylate), PC (polycarbonate), PEN (polyethylene naphthalate), PET (polyethylene terephthalate), TAC (triacetylcellulose) PES (polyethersulfone) and at least one compound selected from the group consisting of fluororesins are preferred.
- thermoplastic resins are also so-called weather resistant organic materials.
- polymer materials such as curable resins described later as coating layers on these resins, organic / inorganic nanocomposites used as sol / gel materials, etc. may also be used. Is possible.
- the organic material is also preferably a fluororesin.
- PMMA polymethylmethacrylate
- additives such as plasticizers and thermal antioxidants are added at the time of molding.
- yellowing increase in ⁇ YI value
- the fluororesin is excellent in weather resistance, heat resistance, water vapor transmission resistance, transparency, etc., it can prevent deterioration of the material due to sunlight or the like, and can be a condensing film having long-term durability. Moreover, it is excellent also in light transmittance.
- the fluororesin is not particularly limited as long as it is a melt-processable fluororesin, but is preferably a homopolymer or copolymer having a repeating unit derived from at least one fluorine-containing ethylenic monomer. .
- the fluororesin may be obtained by polymerizing only a fluorine-containing ethylenic monomer, or by polymerizing a fluorine-containing ethylenic monomer and an ethylenic monomer having no fluorine atom. It may be a thing.
- PAVE examples include perfluoro (methyl vinyl ether) [PMVE], perfluoro (ethyl vinyl ether) [PEVE], perfluoro (propyl vinyl ether) [PPVE], perfluoro (butyl vinyl ether), etc.
- PMVE PEVE or PPVE is more preferable.
- alkyl perfluorovinyl ether derivative those in which Rf 2 is a perfluoroalkyl group having 1 to 3 carbon atoms are preferable, and CF 2 ⁇ CF—O—CH 2 —CF 2 CF 3 is more preferable.
- the fluororesin may have a repeating unit derived from an ethylenic monomer having no fluorine atom, and is an ethylenic monomer having 5 or less carbon atoms from the viewpoint of maintaining heat resistance and chemical resistance. Having a repeating unit derived from the body is also a preferred form.
- the fluororesin may have at least one fluorine-free ethylenic monomer selected from the group consisting of ethylene, propylene, 1-butene, 2-butene, vinyl chloride, vinylidene chloride and unsaturated carboxylic acid. preferable.
- the unsaturated carboxylic acid has at least one carbon-carbon unsaturated bond in one molecule that enables copolymerization, and one molecule of a carbonyloxy group [—C ( ⁇ O) —O—].
- Those having at least one are preferable, and may be an aliphatic unsaturated monocarboxylic acid, or may be an aliphatic unsaturated polycarboxylic acid having two or more carboxyl groups. / 100420 pamphlet as described in the unsaturated carboxylic acid.
- aliphatic unsaturated carboxylic acid examples include (meth) acrylic acid, crotonic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, itaconic anhydride, citraconic acid, citraconic anhydride, mesaconic acid and aconite More preferably, it is at least one selected from the group consisting of acids.
- fluororesin examples include polychlorotrifluoroethylene [PCTFE], ethylene [Et] / TFE copolymer [ETFE], CTFE / TFE copolymer, TFE / HFP copolymer [FEP], and TFE / PAVE copolymer. It is preferably at least one selected from the group consisting of a combination [PFA] and polyvinylidene fluoride [PVdF], and is selected from the group consisting of PCTFE, ETFE, CTFE / TFE copolymer, FEP and PFA. More preferably, it is at least one fluororesin.
- the CTFE / TFE copolymer is preferably a copolymer comprising CTFE, TFE, and a monomer copolymerizable with CTFE and TFE.
- ethylene, VdF, HFP, CH 2 CZ 1 (CF 2 ) n Z 2 (wherein Z 1 is H or F, Z 2 is H, F or Cl, n is an integer of 1 to 10.)
- CF 2 CF-ORf 1 (wherein Rf 1 represents a perfluoroalkyl group having 1 to 8 carbon atoms).
- Rf 5 represents a perfluoroalkyl group having 1 to 5 carbon atoms.
- at least one selected from the group consisting of ethylene, VdF, HFP, and PAVE is preferable, and PAVE is more preferable.
- PAVE perfluoro (methyl vinyl ether) [PMVE], perfluoro (ethyl vinyl ether) [PEVE], perfluoro (propyl vinyl ether) [PPVE], perfluoro (butyl vinyl ether), among others, PMVE. PEVE or PPVE is more preferable.
- alkyl perfluorovinyl ether derivative those in which Rf 5 is a perfluoroalkyl group having 1 to 3 carbon atoms are preferable, and CF 2 ⁇ CF—O—CH 2 —CF 2 CF 3 is more preferable.
- the CTFE / TFE copolymer has a monomer unit derived from CTFE and a monomer copolymerizable with TFE in an amount of 0.1 to 10 mol%, and a total of CTFE units and TFE units of 90 to 99.99%. It is preferably 9 mol%. If the amount of copolymerizable monomer units is too small, the moldability, environmental stress crack resistance and stress crack resistance tend to be inferior, and if too large, the heat resistance, mechanical properties, productivity, etc. tend to be inferior.
- the lower limit of the monomer unit derived from the monomer copolymerizable with CTFE and TFE is more preferably 0.5 mol%, and the upper limit is more preferably 5 mol%.
- the FEP is preferable in that it can be particularly excellent in heat resistance.
- the FEP is not particularly limited, but is preferably a copolymer comprising 70 to 99 mol% of TFE units and 1 to 30 mol% of HFP units, and 80 to 97 mol% of TFE units and 3 to 20 mol% of HFP units. More preferably, it is a copolymer comprising If the TFE unit is less than 70 mol%, the mechanical properties tend to decrease, and if it exceeds 99 mol%, the melting point becomes too high and the moldability tends to decrease.
- FEP may be a copolymer comprising TFE, HFP, and a monomer copolymerizable with TFE and HFP, and the monomer is exemplified as a monomer copolymerizable with CTFE and TFE.
- Monomer may be used.
- the monomer includes perfluoro (alkyl vinyl ether) [PAVE] represented by CF 2 ⁇ CF—OR f 6 (wherein R f 6 represents a perfluoroalkyl group having 1 to 5 carbon atoms).
- CZ 3 Z 4 CZ 5 (CF 2 ) n Z 6 (wherein Z 3 , Z 4 and Z 5 are the same or different and represent a hydrogen atom or a fluorine atom, and Z 6 represents a hydrogen atom, fluorine A vinyl monomer represented by an atom or a chlorine atom, and n represents an integer of 2 to 10, and CF 2 ⁇ CF—OCH 2 —Rf 7 (wherein Rf 7 represents 1 to 5 represents a perfluoroalkyl group, and the like.
- PAVE is preferable.
- Examples of PAVE and alkyl perfluorovinyl ether derivatives are the same as those exemplified as monomers copolymerizable with CTFE and TFE.
- the monomer units derived from monomers copolymerizable with TFE and HFP are 0.1 to 10 mol%, and the total of TFE units and HFP units is 90 to 99.9 mol%. Is preferred. If the copolymerizable monomer unit is less than 0.1 mol%, the moldability, environmental stress crack resistance and stress crack resistance tend to be poor, and if it exceeds 10 mol%, heat resistance, mechanical properties, productivity, etc. Tend to be inferior.
- the PFA is particularly preferable because it can be excellent in heat resistance.
- the PFA is not particularly limited, but is preferably a copolymer comprising 70 to 99 mol% of TFE units and 1 to 30 mol% of PAVE units, and 80 to 98.5 mol% of TFE units and 1.5 to 1.5 PAVE units.
- a copolymer consisting of ⁇ 20 mol% is more preferred. If the TFE unit is less than 70 mol%, the mechanical properties tend to decrease, and if it exceeds 99 mol%, the melting point becomes too high and the moldability tends to decrease.
- Examples of the PAVE include those described above, among which at least one selected from the group consisting of PMVE, PEVE and PPVE is more preferable, and PMVE is even more preferable.
- the PFA may be a copolymer composed of TFE, PAVE, and a monomer copolymerizable with TFE and PAVE, and the monomer may be a copolymerizable with CTFE and TFE.
- the exemplified monomers may be used.
- Examples of the alkyl perfluorovinyl ether derivative are the same as those exemplified as monomers copolymerizable with CTFE and TFE.
- monomer units derived from monomers copolymerizable with TFE and PAVE are 0.1 to 10 mol%, and TFE units and PAVE units are 90 to 99.9 mol% in total. It is preferable. If the copolymerizable monomer unit is less than 0.1 mol%, the moldability, environmental stress crack resistance and stress crack resistance tend to be poor, and if it exceeds 10 mol%, heat resistance, mechanical properties, productivity, etc. Tend to be inferior.
- the ETFE is preferable in terms of improving mechanical properties and the like.
- the molar ratio of the TFE unit to the ethylene unit is preferably 20:80 to 90:10, more preferably 37:63 to 85:15, and still more preferably 38:62 to 80:20.
- the ETFE may be a copolymer composed of TFE, ethylene, and a monomer copolymerizable with TFE and ethylene.
- fluorine-containing vinyl monomer represented by the above formula examples include 1,1-dihydroperfluoropropene-1, 1,1-dihydroperfluorobutene-1, 1,1,5-trihydroperfluoropentene-1.
- 1,1,7-trihydroperfluoroheptene-1,1,1,2-trihydroperfluorohexene-1,1,1,2-trihydroperfluorooctene-1,2,2,3 3,4,4,5,5-octafluoropentyl vinyl ether, perfluoro (methyl vinyl ether), perfluoro (propyl vinyl ether), hexafluoropropene, perfluorobutene-1, 3,3,3-trifluoro-2- (trifluoromethyl) propene -1,2,3,3,4,4,5,5- heptafluoro-1-pentene (CH 2 CFC 2 CF 2 CF 2 H), and the like.
- the monomer copolymerizable with TFE and ethylene may be an aliphatic unsaturated carboxylic acid such as itaconic acid or itaconic anhydride described above.
- the monomer copolymerizable with TFE and ethylene is preferably from 0.1 to 10 mol%, more preferably from 0.1 to 5 mol%, particularly preferably from 0.2 to 4 mol%, based on the fluoropolymer. preferable.
- the fluororesin is more preferably at least one fluororesin selected from the group consisting of ETFE, PCTFE, EFEP, FEP and PVdF.
- PMMA used as a hologram material has a total light transmittance of 90% or less, and particularly has a large light absorption on the low wavelength side.
- the ETFE, PCTFE, EFEP, FEP, and PVdF are highly light-transmitting materials and also have high thin film properties, so that absorption and reflection of light can be suppressed and light collection efficiency can be improved.
- the fluororesin is a perhalopolymer.
- a perhalopolymer By using a perhalopolymer, the chemical resistance is excellent.
- the perhalopolymer is a polymer in which halogen atoms are bonded to all the carbon atoms constituting the main chain of the polymer.
- the perhalopolymer is preferably at least one selected from the group consisting of the above-mentioned CTFE / TFE copolymer, FEP and PFA.
- the content of each monomer in the copolymer described above can be calculated by appropriately combining NMR, FT-IR, elemental analysis, and fluorescent X-ray analysis depending on the type of monomer.
- the fluororesin is not particularly limited, but the melting point is preferably 160 to 270 ° C.
- the molecular weight of the fluororesin is preferably within a range that can exhibit characteristics such as mechanical characteristics required for the obtained light-collecting film.
- the MFR at an arbitrary temperature in the range of about 230 to 350 ° C., which is a general molding temperature range of fluororesin is preferably 0.5 to 100 g / 10 min using the melt flow rate [MFR] as an index of molecular weight. .
- fusing point of each resin is calculated
- the fluororesin can be obtained by a conventionally known polymerization method such as suspension polymerization, solution polymerization, emulsion polymerization or bulk polymerization.
- the conditions such as temperature and pressure, the polymerization initiator and other additives can be appropriately set according to the composition and amount of the desired fluororesin.
- organic material that can be used for the light collecting film of the present invention
- a polymer material such as a curable resin, an organic / inorganic nanocomposite material used as a sol / gel material, etc. Etc.
- the curable resin used as a coating layer on a resin made of a thermoplastic resin is preferably used as a coating on a base material or as a coating material for forming a coating film as a single resin.
- a curable resin when used as a coating material, a curable resin is applied to a substrate, cured, and then peeled off from the substrate to form a film. If possible, the light collecting film remains on the substrate. May be processed. Below, these organic materials are demonstrated.
- weather-resistant organic material Although it does not specifically limit as an organic material which comprises the condensing film of this invention, It is preferable that it is a weather resistant organic material.
- the weather-resistant organic material include the above-described thermoplastic resins and the like, and polymer materials such as a curable resin as a coating layer on the resin.
- the weather-resistant organic material is preferably an organic material made of a fluororesin. Examples of the organic material made of a fluororesin include the organic materials made of the above-described fluororesin.
- an organic material made of a thermoplastic fluororesin (I) a fluoroolefin copolymer having a hydroxyl group and / or a carboxyl group , (V) a fluorosilicone resin, (VI) a vinylidene fluoride homopolymer or copolymer having no functional group, and (VII) a fluororesin having no functional group.
- An organic material composed of at least one compound or at least one organic material selected from the group consisting of the following curable resin composition (VIII) and the following curable resin composition (IX) is preferred.
- the thermoplastic fluororesin is preferable in terms of hydrolysis resistance.
- the organic material or curable resin composition comprising the compounds represented by the above (I), (V), (VI), (VII), (VIII), (IX) is preferable in terms of light resistance.
- the weatherable organic material is preferably solvent-soluble.
- weather resistant organic material examples include organic materials composed of the above compounds, and organic materials composed of (II) acrylic lacquer resin, (III) acrylic polyol resin, (IV) acrylic silicon resin, etc.
- fluoroolefin copolymer (I) having a hydroxyl group and / or carboxyl group examples include, for example, JP-B-60-21686, JP-A-3-121107, JP-A-4-279612, JP-A-4-28707, Examples thereof include those described in each publication such as Kaihei 2-232221, and the number average molecular weight (by GPC) of the copolymer is 1,000 to 100,000, preferably 1,500 to 30,000. If the molecular weight is less than 1000, curability and weather resistance tend to be insufficient, and if it exceeds 100,000, there is a tendency for problems in workability and paintability.
- the hydroxyl value of the fluoroolefin copolymer having a hydroxyl group and / or a carboxyl group is 0 to 200 (mgKOH / g), and preferably 0 to 150 (mgKOH / g). If the hydroxyl group is reduced, curing tends to be poor, and if it exceeds 200 (mgKOH / g), there is a tendency to cause a problem in flexibility.
- the acid value of the fluoroolefin copolymer having a hydroxyl group and / or a carboxyl group is 0 to 200 (mgKOH / g), and more preferably 0 to 100 (mgKOH / g).
- the acid value increases, there is a tendency that a problem occurs in flexibility.
- a tetrafluoroethylene copolymer can also be used from the viewpoint of antifouling adhesion, decontamination and rust prevention.
- fluoroolefin copolymer having a hydroxyl group and / or a carboxyl group examples include, for example, Zaffle (registered trademark) manufactured by Daikin Industries, Ltd., Lumiflon (registered trademark) manufactured by Asahi Glass Co., Ltd. ), Fluoronate (registered trademark) manufactured by Dainippon Ink & Chemicals, Inc., and ZAFLON (registered trademark) manufactured by Toa Gosei Co., Ltd. are included.
- acrylic polyol resin (III) examples include (a) a hydroxyl group-containing ethylenically unsaturated monomer such as a hydroxyl group-containing (meth) acrylic ester, hydroxy vinyl ether, allyl alcohol, and (b) an olefin that does not contain a hydroxyl group. , Vinyl ether, allyl ether, vinyl ester, propenyl ester, (meth) acrylic acid ester, vinyl aromatic compound, (meth) acrylonitrile, carboxyl group-containing unsaturated monomer, epoxy group-containing unsaturated monomer, amino group-containing Examples thereof include polymers with hydroxyl-free unsaturated monomers such as unsaturated monomers.
- the acrylic polyol resin may have at least one group selected from the group consisting of a hydroxyl group, a carboxyl group, an epoxy group, and an amino group.
- the hydroxyl value of the acrylic polyol resin (III) is 0 to 200 (mgKOH / g), and preferably 0 to 100 (mgKOH / g). When the hydroxyl value increases, there is a tendency that a problem occurs in flexibility.
- the acid value of the acrylic polyol resin (III) is 0 to 200 (mgKOH / g), and more preferably 0 to 100 (mgKOH / g). When the acid value is increased, there is a tendency that a problem occurs in flexibility.
- acrylic lacquer resin (II) examples include resins made from monomers used in acrylic polyol resins, having a hydroxyl value of zero and an acid value of 0 to 10.
- acrylic polyol resin (III) or acrylic lacquer resin (II) for example, Dainar (registered trademark) manufactured by Mitsubishi Rayon Co., Ltd., Acridic (registered trademark) manufactured by Dainippon Ink & Chemicals, Ltd., Hitachi Chemical ( Commercial products such as Hitaroid (registered trademark) manufactured by Mitsui Toatsu Chemicals, Inc. and Olester (registered trademark) can be used.
- acrylic silicon resin (IV) examples include an acrylic silicon monomer having at least one silane group and a radically polymerizable unsaturated group in one molecule, and the above hydroxyl group-containing ethylenically unsaturated monomer (a And / or those copolymerized with the hydroxyl group-free unsaturated monomer (b).
- the acrylic silicone resin (IV) may have a hydrolyzable silyl group, a hydroxyl group, and an epoxy group.
- acrylic silicon resin (IV) for example, commercially available products such as Zemlac (registered trademark) manufactured by Kaneka Corporation and Clearer (registered trademark) manufactured by Sanyo Chemical Industries, Ltd. can be used.
- a resin whose surface is hydrophilized by adding an organometallic compound having a hydrolyzable leaving group, an oligomer thereof and / or a co-oligomer of two or more of the organometallic compounds to the weather resistant organic material can be used as
- This organometallic compound has the following general formula (1): Z 8 e M (OR 22 ) d R 23 f (1) [Wherein, d is 0 or an integer of 1 to 6, e is 0 or an integer of 1 to 5, f is an integer of 0 or 1 to 6 (provided that d + e + f ⁇ 3, and d and f are simultaneously set to 0)
- Z 8 may be the same or different and each of them may be an oxygen atom, a nitrogen atom, a fluorine atom and / or a chlorine atom, a monovalent organic group having 1 to 5000 carbon atoms or a hydrogen atom
- M is A metal atom having at least a trivalent valence
- R 22 is the same or different, and each of them may contain an oxygen atom, a nitrogen atom, a fluorine atom and / or a chlorine atom, and a monovalent organic having 1 to 1000 carbon atoms Group, siloxane residue or hydrogen atom
- R 23
- organometallic compound a compound represented by the above general formula (1) is preferable.
- organometallic compounds, oligomers thereof or two or more kinds of these co-oligomers are those described in International Publication No. WO97 / 11130.
- general formula (2) excluded in the pamphlet is those described in International Publication No. WO97 / 11130.
- R 15 is all different or at least two are the same and each is a monovalent organic group having 1 to 1000 carbon atoms, and includes an oxygen atom, a nitrogen atom, and / or Alternatively, a silicon atom may be contained, and a part of or all of the hydrogen atoms of the organic group may be substituted with a fluorine atom or a fluorine atom and a chlorine atom). Is possible.
- organometallic compounds have the effect of hydrophilizing the surface of the coating film, but more preferable substituents and molecular weights may be selected and used depending on the intended function and application.
- d is 0 or an integer of 1 to 6, and preferably an integer of 2 to 4, from the viewpoint of surface concentration, hydrolyzability, and detachability.
- e is 0 or an integer of 1 to 5, and preferably an integer of 0 to 1, from the viewpoint of surface concentration and hydrophilicity.
- f is 0 or an integer of 1 to 6, and preferably an integer of 0 to 3, from the viewpoints of surface concentration, hydrolyzability, and detachability.
- the total amount of d, e, and f is an amount determined by the valence of the metal atom M.
- either one of OR 22 and R 23 represents antifouling adhesion, surface concentration.
- D and f are not simultaneously 0, and the total amount of d, e and f is at least 3.
- Z 8 may be a hydrogen atom, and may contain an oxygen atom, a nitrogen atom, a fluorine atom and / or a chlorine atom, for example, as listed in the following (1) to (3):
- a monovalent organic group having 1 to 5000 carbon atoms is preferable.
- the organic group Z 8 includes, for example, H (CH 2 ) p , (CH 3 ) 2 CH, H (CH 2 ) p C ⁇ O, F (CF 2 ) q (CH 2 ) p , (CF 3 ) 2 CH, H (CF 2 ) q (CH 2 ) p (wherein p is 0 or an integer from 1 to 6, q is an integer from 1 to 10, and a part of the fluorine atom is substituted with a chlorine atom)
- These organic groups may be linear or branched.
- the organic group Z 8 is, for example, NH 2 , secondary amino group, tertiary amino group, OH, NCO, CO 2 H, CO 2 Na, CO 2 K, SO 3 H, SO 2 Na , SO 3 K, an epoxy group, an organic group having a functional group such as an oxyethylene group (CH 2 CH 2 O), and the like.
- OCN (CH 2 ) 3 and CH 3 O (CH 2 CH 2 O) 5 (CH 2 ) 3 are preferable from the viewpoint of hydrophilicity, compatibility, and adhesion.
- the organic group Z 8 is a polymerizable organic group which may contain, for example, an oxygen atom, a nitrogen atom, a fluorine atom, a chlorine atom, or a silicon atom.
- CH 2 C (CH 3) CO 2 (CH 2) 3
- CH 2 CH
- CH 2 CH
- CH 2 CHCH 2
- CH 2 CHO (CH 2) 3
- CH 2 CHOCO (CH 2 ) 3
- R 22 s may be the same or different and each may contain an oxygen atom, a nitrogen atom, a fluorine atom and / or a chlorine atom. From these points, it is a monovalent organic group having 1 to 1000 carbon atoms, a siloxane residue, or a hydrogen atom, and the above carbon number is preferably 1 to 100, more preferably 1 to 16.
- organic groups include CF 3 CH 2 , CF 3 CF 2 CH 2 , CF 3 (CF 2 ) 2 CH 2 , CF 3 (CF 2 ) 3 CH 2 CH 2 , and (CF 3 ) 2.
- CF 3 CH 2 CF 3 CF 2 CH 2 , CF 3 (CF 2 ) 2 CH 2 , CF 3 (CF 2 ) 3 CH 2 CH 2 , CF 3 C ⁇ O, CF 3 CF 2 C ⁇ O are preferred, CF 3 CH 2 , More preferred is CF 3 CF 2 CH 2 .
- the siloxane residue in R 22 in the general formula (1) is, for example, (Si (OR 22 ) 2 O) n R 22 (wherein R 22 is a monovalent organic group in R 22 described above) The same).
- R 23 may be the same or different and has a chelating ability which may contain a fluorine atom and / or a chlorine atom, and has surface concentrating property, hydrolyzability.
- the organic group preferably has 1 to 20 carbon atoms and preferably 2 to 10 carbon atoms.
- Examples of compounds that can be an organic group having such chelating ability include ⁇ -diketones such as 2,4-pentanedione and 2,4-heptanedione, methyl acetoacetate, ethyl acetoacetate, butyl acetoacetate Ketosters such as, lactic acid, methyl lactate, ethyl lactate, ammonium lactate salt, salicylic acid, methyl salicylate, ethyl salicylate, malic acid, ethyl malate, tartaric acid, ethyl tartrate, etc., esters, salts thereof, 4-hydroxy Ketoalcohols such as -4-methyl-2-pentanone, 4-hydroxy-2-pentanone, 4-hydroxy-2-heptanone, 4-hydroxy-4-methyl-2-heptanone, monoethanolamine, diethanolamine, triethanol Amine, N-methyl monoe Enolic active hydrogen compounds such as aminoamines such as noramine, N-ethylmonoethanol
- the metal atom M is, for example, B, Al, Ga, In, Tl, Sc, Y, La, Ac, Si, Ge, Sn, Pb, Ti, Zr, Hf, As, Sb, Bi. V, Nb, Ta, Te, Po, Cr, Mo, W, At, Mn, Tc, Re, Fe, Co, Ni, Ru, Rh, Pd, Os, Ir, Pt, etc.
- Al, Ti, B, Zr or Si, particularly Si is preferable from the viewpoint of availability.
- oligomer or co-oligomer in the present invention examples include linear, branched, cyclic, and three-dimensional oligomers or co-oligomers.
- the degree of polymerization of the oligomer or co-oligomer is preferably 2 to 100, and more preferably 4 to 20.
- the degree of polymerization becomes small, the oligomer or co-oligomer tends to have a low boiling point, tends to volatilize during coating, and is difficult to be taken into the coating film.
- the degree of polymerization exceeds 100, it is difficult to control the degree of polymerization during synthesis, the viscosity of the oligomer or co-oligomer tends to be high, and workability tends to be poor.
- the degree of polymerization is the appearance of coating film, sagging resistance, From the viewpoint of alkalinity, it is preferably more than 4 and 30 or less.
- the resulting hydrophilized resin By adding an organometallic compound having a hydrolyzable leaving group, an oligomer thereof and / or a co-oligomer of two or more of the organometallic compounds to a weather resistant organic material, the resulting hydrophilized resin It is possible to add a curing agent.
- curing agent examples include isocyanate compounds, blocked isocyanate compounds, melamine resins, dibasic acids, non-hydrolyzable group-containing silane compounds, epoxy resins or acid anhydrides, but they are weather resistant and acid rain resistant.
- isocyanate blocked isocyanate and epoxy resin are preferred.
- Examples of the isocyanate compound and the blocked isocyanate compound include 2,4-tolylene diisocyanate, diphenylmethane-4,4'-diisocyanate, xylylene diisocyanate, isophorone diisocyanate, lysine methyl ester diisocyanate, methylcyclohexyl diisocyanate, trimethylhexamethylene diisocyanate, hexa Methylene diisocyanate, n-pentane-1,4-diisocyanate, trimers thereof, adducts and burettes thereof, polymers having two or more isocyanate groups, blocked isocyanates, etc. However, it is not limited to these.
- the mixing ratio of the isocyanate and the weather resistant organic material is preferably 0.5 to 5.0, more preferably 0.8 to 1.2 in terms of NCO / OH (molar ratio).
- the isocyanate is a moisture curing type, 1.1 to 1.5 is preferable.
- melamine resin examples include, in addition to melamine resin, methylolated melamine resin obtained by methylolating melamine, alkyletherified melamine resin obtained by etherifying methylolated melamine with alcohols such as methanol, ethanol, and butanol. It is not limited to these.
- epoxy compound examples include the following formula:
- acid anhydride examples include phthalic anhydride, trimellitic anhydride, pyromellitic anhydride, 1,2-cyclohexyldicarboxylic anhydride, succinic anhydride, maleic anhydride, and the like, but are not limited thereto. Absent.
- dibasic acids such as fumaric acid, succinic acid, adipic acid, azelaic acid, sebacic acid, dodecanedioic acid and 1,2-cyclohexyldicarboxylic acid are also used as curing agents.
- the curing catalyst examples include an organic tin compound, an organic acidic phosphate ester, an organic titanate compound, a reaction product of an acidic phosphate ester and an amine, a saturated or unsaturated polycarboxylic acid or an acid anhydride thereof, an organic sulfonic acid, Examples thereof include amine compounds, aluminum chelate compounds, titanium chelate compounds, and zirconium chelate compounds.
- organic tin compound examples include dibutyltin dilaurate, dibutyltin maleate, dioctyltin maleate, dibutyltin diacetate and the like.
- organic acid phosphate ester examples include the following formula:
- organic titanate compound examples include titanic acid esters such as tetrabutyl titanate, tetraisopropyl titanate, and triethanolamine titanate.
- amine compound examples include, for example, butylamine, octylamine, dibutylamine, monoethanolamine, diethanolamine, triethanolamine, diethylenetriamine, triethylenetetramine, oleylamine, cyclohexylamine, benzylamine, diethylaminopropylamine, xylylene diene.
- amine compounds carboxylic acid salts, low polyamide resins obtained from excess polyamines and polybasic acids, excess polyamines and epoxy compounds Such as response products, and the like.
- the chelate compound examples include aluminum tris (ethyl acetoacetate), aluminum tris (acetylacetonate), zirconium tetrakis (acetylacetonate), diisopropoxy bis (ethylacetoacetate) titanate and the like.
- fluororesins having no functional group examples include homopolymers or copolymers of vinylidene fluoride described in JP-B 43-10363, JP-A-3-28206, JP-A-4-189879, etc. A coalescence etc. can be used and it can also blend with resin which has said functional group. Moreover, when using resin which does not have a functional group, it is not necessarily necessary to use a hardening
- Curable resin composition (VIII) comprises (A) a hydroxyl-containing fluorine-containing copolymer (A-1) containing a fluoroolefin unit and a hydroxyl-containing radically polymerizable unsaturated monomer unit, one isocyanate group, A reaction product of an isocyanate group-containing unsaturated compound (A-2) having at least one radically polymerizable unsaturated group and (B) an acrylic monomer.
- Fluoroolefin units in the hydroxyl group-containing fluorine-containing copolymer (A-1) include tetrafluoroethylene (TFE) units, chlorotrifluoroethylene (CTFE) units, vinyl fluoride (VF) units, and vinylidene fluoride (VdF).
- TFE tetrafluoroethylene
- CTFE chlorotrifluoroethylene
- VF vinyl fluoride
- VdF vinylidene fluoride
- One or more units such as a unit, hexafluoropropylene (HFP) unit, trifluoroethylene (TrFE) unit, perfluoro (alkyl vinyl ether) (PAVE) unit, and the PAVE unit is a perfluoromethyl vinyl ether unit.
- perfluoropropyl vinyl ether units include tetrafluoroethylene (TFE) units, chlorotrifluoroethylene (CTFE) units, vinyl fluoride (VF) units, and vinylidene flu
- TFE units examples include TFE / HFP units, TFE / PAVE units, TFE / ethylene units, TFE / vinyl ether units, TFE / vinyl ester units, TFE / vinyl ester / vinyl ether units, TFE / And vinyl ether / allyl ether units.
- TFE / HFP units TFE / PAVE units
- TFE / ethylene units TFE / vinyl ether units
- TFE / vinyl ester units TFE / vinyl ester / vinyl ether units
- TFE / And vinyl ether / allyl ether units examples of combinations of two or more units including TFE units include TFE / HFP units, TFE / PAVE units, TFE / ethylene units, TFE / vinyl ether units, TFE / vinyl ester units, TFE / vinyl ester / vinyl ether units, TFE / And vinyl ether / allyl ether units.
- TFE / ethylene unit TFE / vinyl ether
- CTFE units examples include CTFE / HFP units, CTFE / PAVE units, CTFE / ethylene units, CTFE / vinyl ether units, CTFE / vinyl ester units, CTFE / vinyl ester / vinyl ether units, CTFE / And vinyl ether / allyl ether units.
- CTFE / HFP units CTFE / PAVE units
- CTFE / ethylene units CTFE / vinyl ether units
- CTFE / vinyl ester units CTFE / vinyl ester / vinyl ether units
- CTFE / And vinyl ether / allyl ether units examples of combinations of two or more units including CTFE units.
- combinations of two or more units containing HFP units include CTFE / HFP units, TFE / HFP units, HFP / vinyl ether units, HFP / vinyl ester units, HFP / vinyl ester / vinyl ether units, HFP / vinyl ether / allyl. Ether unit and the like.
- HFP / vinyl ether unit, HFP / vinyl ester unit, HFP / vinyl ester / vinyl ether unit, HFP / vinyl ether / allyl ether unit, etc. are used because of good mixing with the ethylenically unsaturated group-containing monomer. preferable.
- VdF units examples include VdF / TFE units, VdF / HFP units, VdF / TFE / HFP units, VdF / CTFE units, VdF / TFE / PAVE units, VdF / CTFE / TFE units, Examples include VdF / CTFE / HFP units.
- hydroxyl group-containing radically polymerizable unsaturated monomer unit in the hydroxyl group-containing fluorine-containing copolymer (A-1) include, for example, the following formula:
- R 1 is —OR 2 or —CH 2 OR 2 (where R 2 is an alkyl group having a hydroxyl group)) and hydroxyalkyl vinyl ethers and hydroxyalkyl allyl ethers.
- R 2 is, for example, one having 1 to 3, preferably 1 hydroxyl group bonded to a linear or branched alkyl group having 1 to 8 carbon atoms.
- Examples of these are, for example, 2-hydroxyethyl vinyl ether unit, 3-hydroxypropyl vinyl ether unit, 2-hydroxypropyl vinyl ether unit, 2-hydroxy-2-methylpropyl vinyl ether unit, 4-hydroxybutyl vinyl ether unit, 4-hydroxy- 2-methylbutyl vinyl ether unit, 5-hydroxypentyl vinyl ether unit, 6-hydroxyhexyl vinyl ether unit, 2-hydroxyethyl allyl ether unit, 4-hydroxybutyl allyl ether unit, ethylene glycol monoallyl ether unit, diethylene glycol monoallyl ether unit, Examples include triethylene glycol monoallyl ether unit and glycerin monoallyl ether unit. Hydroxyalkyl vinyl ether of 3 to 8, these, 4-hydroxybutyl vinyl ether unit and 2-hydroxyethyl vinyl ether unit are preferred from the viewpoint of polymerization is easy.
- the hydroxyl group-containing fluorine-containing copolymer (A-1) preferably further contains a non-fluorine vinyl ether unit and / or a non-fluorine vinyl ester unit that does not contain a hydroxyl group, from the viewpoint of enhancing the solubility with an acrylic monomer.
- non-fluorine vinyl ether unit and / or non-fluorine vinyl ester unit not containing a hydroxyl group in the hydroxyl group-containing fluorine-containing copolymer (A-1) include, for example, the following formula:
- R 4 is, for example, a linear, branched or cyclic alkyl group having 1 to 8 carbon atoms. Examples of these are, for example, cyclohexyl vinyl ether units, methyl vinyl ether units, ethyl vinyl ether units, propyl vinyl ether units, n-butyl vinyl ether units, isobutyl vinyl ether units, vinyl acetate units, vinyl propionate units, vinyl butyrate units, vinyl isobutyrate units.
- Vinyl pivalate units, vinyl caproate units, vinyl versatate units, vinyl laurate units, vinyl stearate units and vinyl cyclohexylcarboxylate units are preferred.
- vinyl versatate, vinyl laurate, vinyl stearate, vinyl cyclohexylcarboxylate, and vinyl acetate are preferable from the viewpoint of excellent weather resistance, solubility, and low cost.
- non-aromatic carboxylic acid vinyl esters particularly carboxylic acid vinyl esters having a carboxylic acid having 6 or more carbon atoms, more preferably carboxylic acids having 9 or more carbon atoms. Esters are preferred.
- the upper limit of the carbon number of the carboxylic acid in the carboxylic acid vinyl ester is preferably 20 or less, and more preferably 15 or less.
- vinyl versatate is most preferable.
- the hydroxyl group-containing fluorine-containing copolymer (A-1) may contain a carboxyl group-containing monomer unit.
- the carboxyl group-containing monomer unit contains a carboxyl group and does not contain a hydroxyl group and an aromatic group, and is different from other units in this respect.
- the carboxyl group-containing monomer unit When the carboxyl group-containing monomer unit is prepared into a curable resin composition, it improves the dispersibility and curing reactivity of the hydroxyl group-containing fluorine-containing copolymer (A-1), and the gloss, hardness, Has the effect of improving the adhesion to the material.
- carboxyl group-containing monomer unit for example, the following formula:
- R 3 , R 4 and R 5 are the same or different and all are a hydrogen atom, an alkyl group, a carboxyl group or an ester group, n is 0 or 1), or the following formula:
- R 6 and R 7 are the same or different, and each is a saturated or unsaturated linear or cyclic alkyl group, n is 0 or 1, and m is 0 or 1. And group-containing vinyl monomers.
- the lower limit of the proportion of the carboxyl group-containing monomer unit is 0.1 mol%, preferably 0.4 mol%, and the upper limit is 2.0 mol%, preferably 1.5 mol%. If it exceeds 2.0 mol%, it is not preferable in terms of the curing rate of the coating film.
- hydroxyl group-containing fluorine-containing copolymer (A-1) examples include, for example,
- i-Bu Means an isobutyl group
- Tetrafluoroethylene / vinyl versatic acid / hydroxybutyl vinyl ether Tetrafluoroethylene / vinyl versatic acid / hydroxybutyl vinyl ether
- tetrafluoroethylene / vinyl versatic acid / hydroxyethyl vinyl ether / vinyl tert-butylbenzoate Tetrafluoroethylene / vinyl versatic acid / hydroxybutyl vinyl ether / crotonic acid
- Examples of the radically polymerizable unsaturated group in the isocyanate group-containing unsaturated compound (A-2) include a methacryl group, an acryl group, a 2-fluoroacryl group, and a 2-chloroacryl group.
- a methacryl group and an acrylic group are the most preferable from the viewpoint of ease of handling, and an acrylic group is most preferable.
- isocyanate group-containing unsaturated compound (A-2) for example, the following formula:
- R 5 may be different even in the same hydrogen atom, a fluorine atom, a chlorine atom, an alkyl group having 1 to 4 carbon atoms
- R 8 is , —COO—R 9 —, —OCO—R 9 — or —O—R 9 — (wherein R 9 is an alkyl group having 1 to 20 carbon atoms)) can give.
- isocyanate group-containing unsaturated compound (A-2) for example, the following formula:
- polyvalent isocyanate examples include 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, mixed isocyanate of 2,4-tolylene diisocyanate and 2,6-tolylene diisocyanate, and P, P′-diphenylmethane.
- examples thereof include diisocyanate, 1,5-naphthylene diisocyanate, paraphenylene diisocyanate, 1,6-hexamethylene diisocyanate, isophorone diisocyanate, and hydrogenated xylylene diisocyanate.
- Unsaturated monoalcohols include 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, 4-hydroxybutyl acrylate, 4-hydroxybutyl methacrylate and other acryloyl groups or methacryloyl.
- monoalcohols having an allyl group such as monoalcohols having a group, allyl alcohol, allyl cellosolve, and trimethylpropane diallyl ether.
- 2-isocyanate ethyl acrylate or 2-isocyanate ethyl methacrylate is preferable because of easy synthesis and high reactivity.
- the reaction product (A) is a product in which a hydroxyl group in the hydroxyl group-containing fluorine-containing copolymer (A-1) and an isocyanate group in the isocyanate group-containing unsaturated compound (A-2) are urethane-bonded.
- the fluorine content of the reaction product (A) is preferably 2% by mass or more, more preferably 5% by mass or more, more preferably 10% by mass or more from the viewpoint of good weather resistance, water / oil repellency and antifouling properties. Is more preferable.
- the fluorine content of the reaction product (A) is preferably 50% by mass or less, more preferably 30% by mass or less, and further preferably 25% by mass or less from the viewpoint of good solubility in acrylic. preferable.
- the molecular weight of the reaction product (A) is a number average molecular weight, and is preferably 1000 or more, more preferably 2000 or more, more preferably 3000 or more from the viewpoint of the strength and surface hardness of a cured product prepared and cured into a curable composition. Further preferred.
- the molecular weight of the reaction product (A) is a number average molecular weight, preferably 100000 or less from the viewpoint of increased viscosity and difficult to handle, and more preferably 50000 or less from the viewpoint of good solubility in acrylic. From the viewpoint of low viscosity of the composition and good handling, 30000 or less is more preferable.
- the acrylic monomer (B) in the curable resin composition (VIII) refers to a monomer having one or more acryloyl group, methacryloyl group, 2-fluoroacryloyl group, and 2-chloroacryloyl group. This is different from the isocyanate group-containing unsaturated compound (A-2) having a saturated group.
- the radical polymerizable unsaturated group in the acrylic monomer (B) is preferably one from the viewpoint of high solubility and low viscosity of the hydroxyl group-containing fluorine-containing copolymer (A-1), and a curable composition. Two or more are preferable from the viewpoint that the strength of the cured product prepared and cured is good, and more preferably three or more from the viewpoint that the curing rate of the curable composition is good.
- acrylic monomer (B) examples include methyl methacrylate (MMA), methacrylic acid (MA), ethyl methacrylate (EMA), n-butyl methacrylate (nBMA), isobutyl methacrylate (iBMA), 2-ethylhexyl methacrylate, Phenyl methacrylate, cyclohexyl methacrylate, 3- (trimethoxysilyl) propyl methacrylate (MSPM), 2- (phenylphosphoryl) ethyl methacrylate (phenyl-P), 2,2-bis (4-methacryloxyphenyl) propane (BPDMA), 2,2-bis (4-methacryloxyethoxyphenyl) propane (Bis-MEPP), 2,2-bis (4-methacryloxypolyethoxyphenyl) propane (Bis-MPEPP), di (methacrylate) Roxyethyl) trimethylhexamethylenediurethane (UDMA), trimethylolpropane
- an acrylic monomer having a curable functional group because a cured product having excellent adhesion, chemical resistance, curability and the like can be obtained.
- the acrylic monomer having a curable functional group include an acrylic monomer having a hydroxyl group, a carboxyl group, an epoxy group, an amino group, and the like.
- hydroxyethyl (meth) acrylate 2-hydroxypropyl (meth) acrylate, 2-hydroxyethyl vinyl ether, (meth) acrylic acid, glycidyl (meth) acrylate
- curable functional group-containing acrylic monomers such as 2-aminoethyl (meth) acrylate and 2-aminopropyl (meth) acrylate.
- acrylic monomer as described above examples include good solubility of the hydroxyl group-containing fluorine-containing copolymer (A-1), the isocyanate group-containing unsaturated compound (A-2), and the reaction product (A) thereof. From the viewpoint, methyl methacrylate, ethyl methacrylate, methyl acrylate, and ethyl acrylate are preferable.
- the mass ratio of the reaction product (A) and the acrylic monomer (B) is preferably 95: 5 to 5:95, more preferably 80:20 to 20:80, and still more preferably 70:30 to 30:70.
- the mass ratio of the reaction product (A) and the acrylic monomer (B) is off from 95: 5 and the mass of the reaction product (A) is increased, the viscosity tends to be high and difficult to handle.
- the fluorine content decreases when the mass ratio of the reaction product (A) and the acrylic monomer (B) deviates from 5:95 and the mass of the reaction product (A) decreases, the curable composition is There is a tendency that the weather resistance, water / oil repellency and antifouling property of the cured product are lowered.
- the ratio of the reaction product (A) and the acrylic monomer (B) is preferably 10 parts by mass or more, and 40 parts by mass with respect to 100 parts by mass of the reaction product (A). Part or more is more preferable, and 60 parts by mass or more is more preferable.
- the amount of the acrylic monomer (B) decreases, the viscosity tends to be high and difficult to handle. Moreover, 1500 mass parts or less are preferable with respect to 100 mass parts of reaction products (A), 1200 mass parts or less are more preferable, and 1000 mass parts or less are more preferable.
- the amount of the acrylic monomer (B) increases, the fluorine content decreases, so that the weather resistance, water / oil repellency and antifouling properties of the cured product obtained by curing the curable composition tend to decrease. .
- the viscosity of the curable resin composition at 25 ° C. is preferably 5 mPa ⁇ s or more because the dripping is excessive when the viscosity is too low, and the handleability is lowered. From the viewpoint that the thin film formability is good, 10 mPa ⁇ s or more is more preferable, and 50 mPa ⁇ s or more is more preferable from the viewpoint that curing shrinkage during curing is small. Further, the viscosity at 25 ° C. of the curable resin composition is preferably 100000 mPa ⁇ s or less from the viewpoint of good handleability, and 5000 mPa ⁇ s from the viewpoint that the curable composition spreads throughout the details during the molding process. s or less is more preferable, and 3000 mPa ⁇ s or less is more preferable from the viewpoint of good leveling (surface smoothness) when a thin film is formed.
- the curable resin composition may further contain a curing agent.
- the curing agent is a compound that crosslinks by reacting with the curing reactive group of the hydroxyl group-containing fluorine-containing copolymer (A-1).
- A-1 hydroxyl group-containing fluorine-containing copolymer
- isocyanates, amino resins, acid anhydrides having no unsaturated bond In general, polyepoxy compounds, isocyanate group-containing silane compounds, and the like are used.
- isocyanates having no unsaturated bond include 2,4-tolylene diisocyanate, diphenylmethane-4,4′-diisocyanate, xylylene diisocyanate, isophorone diisocyanate, lysine methyl ester diisocyanate, and methylcyclohexyl diisocyanate.
- amino resins include urea resins, melamine resins, benzoguanamine resins, glycoluril resins, methylolated melamine resins obtained by methylolating melamine, and methylolated melamines with alcohols such as methanol, ethanol, and butanol.
- examples include etherified alkyl etherified melamine resins, but are not limited thereto.
- acid anhydrides include, but are not limited to, phthalic anhydride, pyromellitic anhydride, meritic anhydride, and the like.
- polyepoxy compound and the isocyanate group-containing silane compound for example, those described in JP-A-2-232250, JP-A-2-232251 and the like can be used.
- JP-A-2-232250, JP-A-2-232251 and the like can be used as the polyepoxy compound and the isocyanate group-containing silane compound.
- a suitable example for example, for example,
- the compounding amount of the curing agent is 0.1 to 5 equivalents, preferably 0.5 to 1.5 equivalents with respect to 1 equivalent of the chemical curing reactive group in the hydroxyl group-containing fluorine-containing copolymer (A-1). It is.
- the composition of the present invention can be cured usually at 0 to 200 ° C. for several minutes to about 10 days.
- the reaction product (A) and the acrylic monomer (B) are cured by UV irradiation when polymerized, and therefore a photopolymerization initiator is included in the curable resin composition. You may go out.
- photopolymerization initiators include acetophenone compounds such as acetophenone, chloroacetophenone, diethoxyacetophenone, hydroxyacetophenone, ⁇ -aminoacetophenone; benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl Benzoin compounds such as ether and benzyldimethyl ketal; Benzophenone compounds such as benzophenone, benzoylbenzoic acid, methyl benzoylbenzoate, 4-phenylbenzophenone, hydroxybenzophenone, hydroxy-propylbenzophenone, acrylated benzophenone, Michlerketone; thioxanthone, chlorothio Xanthone, methylthioxanthone, diethylthioxanthone, dimethyl Thioxanthones such as thioxanthone; Other compounds, benzox
- photoinitiator adjuvants such as amines, sulfones, and sulfines, as needed.
- the curable resin composition does not contain an organic solvent having no radical-reactive group and a fluorine-based solvent, and there is no need for a step of removing the solvent after the curable resin composition is cured. It is preferable in that it does not have an adverse effect such as a decrease in heat resistance, a decrease in strength, and white turbidity.
- One curing catalyst may be used, or two or more curing catalysts may be used in combination.
- Preferable curing catalysts include organotin compounds and aluminum chelate compounds. Further, acidic phosphate esters, reaction products of acidic phosphate esters and amines, saturated or unsaturated polyvalent carboxylic acids or acid anhydrides thereof, organic titanate compounds, amine compounds, lead octylates and the like can be mentioned.
- organic tin compound examples include dibutyltin dilaurate, dibutyltin maleate, dioctyltin maleate, dibutyltin diacetate, dibutyltin phthalate, tin octylate, tin naphthenate, and dibutyltin methoxide.
- the acidic phosphate ester is N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N
- organic titanate compound examples include titanic acid esters such as tetrabutyl titanate, tetraisopropyl titanate, and triethanolamine titanate.
- amine compound examples include, for example, butylamine, octylamine, dibutylamine, monoethanolamine, diethanolamine, triethanolamine, diethylenetriamine, triethylenetetramine, oleylamine, cyclohexylamine, benzylamine, diethylaminopropylamine, xylylene diene.
- Low molecular weight polyamide resins obtained from excess polyamines and polybasic acids, excess polyamines and epoxy compounds Such as the reaction product, and the like.
- the blending ratio of the curing accelerator is preferably 1.0 ⁇ 10 ⁇ 6 to 1.0 ⁇ 10 ⁇ 2 parts by mass with respect to 100 parts by mass of the copolymer, and 5.0 ⁇ 10 ⁇ 5 to 1.0 ⁇ 10 ⁇ 3 parts by mass is more preferred.
- the blending ratio of the weatherable organic material and the organometallic compound varies depending on the purpose and application, but is usually 0.1 to 50 parts by weight of the organometallic compound with respect to 100 parts by weight of the weatherable organic material.
- the amount is preferably 1 to 30 parts by weight. If the amount is less than 0.1 parts by weight, the hydrophilizing action tends to be insufficient. If the amount exceeds 50 parts by weight, the appearance of the coating film is poor and the compatibility with the resin tends to be reduced.
- Curable resin composition (IX) comprises (A) a hydroxyl group-containing fluoropolymer (A-1) containing a radical polymerizable unsaturated monomer unit containing a fluorine atom and a hydroxyl group, one isocyanate group, A reaction product of an isocyanate group-containing unsaturated compound (A-2) having at least one radically polymerizable unsaturated group and (B) an acrylic monomer.
- hydroxyl group-containing radical polymerizable unsaturated monomer unit in the hydroxyl group-containing fluorine-containing copolymer (A-1) include, for example, formula (I):
- X 1 and X 2 may be the same or different and are a fluorine atom or a hydrogen atom;
- X 3 is a fluorine atom, a hydrogen atom, a chlorine atom, a methyl group, or a trifluoromethyl group.
- R 1 is a C 1-30 linear or branched alkyl group, a fluoroalkyl group, or a perfluoroalkyl group containing at least one hydroxyl group, and an ether bond, an ester bond, It may contain a urethane bond, provided that it contains at least one fluorine atom in any of X 1 to X 3 and R 1 ) It is a hydroxyl-containing fluorine-containing ethylenic monomer shown by these. Among these, a hydroxyl group-containing fluorine-containing ethylenic monomer represented by the formula (II) is more preferable.
- X 1 and X 2 may be the same or different and are a fluorine atom or a hydrogen atom;
- X 3 is a fluorine atom, a hydrogen atom, a chlorine atom, a methyl group, or a trifluoromethyl group.
- X 4 and X 5 may be the same or different and are a hydrogen atom, a fluorine atom, a methyl group or a trifluoromethyl group; a is an integer of 0 to 3; b is 0 or 1; R 2 is a hydroxyl group; A linear or branched alkyl group having 1 to 29 carbon atoms, a fluoroalkyl group or a perfluoroalkyl group containing at least one or more of an ether bond, an ester bond, or a urethane bond. Provided that at least one fluorine atom is contained in any of X 1 to X 5 and R 2 )
- a more preferred hydroxyl group-containing fluorine-containing ethylenic monomer is represented by the formula (III).
- R 3 is a C1-C29 linear or branched alkyl group, a fluoroalkyl group, or a perfluoroalkyl group containing at least one hydroxyl group, and an ether in the chain. Bond, ester bond, urethane bond may be included)
- the carbon atom to which the hydroxyl group is directly bonded can be classified into three types, primary carbon, secondary carbon and tertiary carbon, depending on the number of carbon bonded to the carbon to which the hydroxyl group is bonded.
- the number of carbons bonded to the carbon to which the hydroxyl group is bonded is 2 (where R and R ′ are 1 or more carbon atoms). Organic group).
- the number of carbons bonded to the carbon to which the hydroxyl group is bonded such as R—CR′R ′′ —OH (where R, R ′, R ′ 'Is an organic group having 1 or more carbon atoms.
- R—CR′R ′′ —OH where R, R ′, R ′ 'Is an organic group having 1 or more carbon atoms.
- the hydroxyl group bonded to the primary and secondary carbons is preferably a hydroxyl group bonded to the primary carbon from the viewpoint of reactivity.
- Y 1 a monovalent hydroxyl group-containing organic group having 1 to 10 carbon atoms and having a hydroxyl group bonded to primary to tertiary carbon as described above is Y 1 , and a specific structure of R 1 to R 3 is shown. A description will be given using Y.
- Y represents Y 1 or simply a hydroxyl group.
- the hydroxyl group-containing fluoropolymer may further contain a monomer unit not containing a hydroxyl group in the structural unit as long as the solubility in acrylic is not impaired.
- a monomer unit not containing a hydroxyl group in the structural unit as long as the solubility in acrylic is not impaired.
- all of the structural units A and M described in WO 02/18457 can be used without any hydroxyl group.
- Examples of the radically polymerizable unsaturated group in the isocyanate group-containing unsaturated compound (A-2) include a methacryl group, an acryl group, a 2-fluoroacryl group, and a 2-chloroacryl group.
- a methacryl group and an acryl group are particularly preferred from the viewpoint of easy handling.
- Examples of the isocyanate group-containing unsaturated compound (A-2) include those represented by the formula (IV):
- R 4 may be different even in the same hydrogen atom, a fluorine atom, a chlorine atom, an alkyl group having 1 to 4 carbon atoms
- R 7 is , —COO—R 8 —, —OCO—R 8 — or —O—R 8 — (wherein R 8 is an alkyl group having 1 to 20 carbon atoms), can give.
- polyvalent isocyanate examples include 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, mixed isocyanate of 2,4-tolylene diisocyanate and 2,6-tolylene diisocyanate, and P, P′-diphenylmethane.
- examples thereof include diisocyanate, 1,5-naphthylene diisocyanate, paraphenylene diisocyanate, 1,6-hexamethylene diisocyanate, isophorone diisocyanate, and hydrogenated xylylene diisocyanate.
- Unsaturated monoalcohols include 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, 4-hydroxybutyl acrylate, 4-hydroxybutyl methacrylate and other acryloyl groups or methacryloyl.
- monoalcohols having an allyl group such as monoalcohols having a group, allyl alcohol, allyl cellosolve, and trimethylpropane diallyl ether.
- 2-isocyanate ethyl acrylate or 2-isocyanate ethyl methacrylate is preferable because of easy synthesis and high reactivity.
- the reaction product (A) is a product in which a hydroxyl group in the hydroxyl group-containing fluoropolymer (A-1) and an isocyanate group in the isocyanate group-containing unsaturated compound (A-2) are urethane-bonded.
- the fluorine content of the reaction product (A) is preferably 20% by mass or more from the viewpoint of good weather resistance, water / oil repellency and antifouling properties, and is transparent in a wide wavelength range from the visible to the near infrared region. From the point that property is favorable, 40 mass% or more is more preferable, and 50 mass% or more is further more preferable.
- the fluorine content of the reaction product (A) is preferably 75% by mass or less, more preferably 70% by mass or less, and further preferably 65% by mass or less from the viewpoint of good solubility in acrylic.
- the molecular weight of the reaction product (A) is a number average molecular weight, preferably 1000 or more, more preferably 2000 or more, from the viewpoint that the strength and surface hardness of the cured product prepared and cured into a curable composition are good. 3000 or more is more preferable. Further, the molecular weight of the reaction product (A) is a number average molecular weight, the viscosity is not increased, and from the viewpoint of good handling, it is preferably 500,000 or less, and from the viewpoint of good solubility in acrylic, 100000. The following is more preferable, and from the viewpoint that the viscosity of the composition is low and the handling is good, 50000 or less is more preferable.
- the acrylic monomer (B) in the curable resin composition (IX) refers to a monomer having one or more acryloyl group, methacryloyl group, 2-fluoroacryloyl group, 2-chloroacryloyl group, and a radical reactive group. This is different from the isocyanate group-containing unsaturated compound (A-2).
- the radical polymerizable unsaturated group in the acrylic monomer (B) is preferably one from the viewpoint that the hydroxyl group-containing fluoropolymer (A-1) has high solubility and low viscosity, and the curable composition contains Two or more are preferable from the viewpoint that the strength of the cured product prepared and cured is good, and more preferably three or more from the viewpoint that the curing rate of the curable composition is good.
- acrylic monomer (B) examples include methyl methacrylate (MMA), methacrylic acid (MA), ethyl methacrylate (EMA), n-butyl methacrylate (nBMA), isobutyl methacrylate (iBMA), 2-ethylhexyl methacrylate, 2-hydroxyethyl methacrylate (HEMA), phenyl methacrylate, cyclohexyl methacrylate, 3- (trimethoxysilyl) propyl methacrylate (MSPM), 2- (phenylphosphoryl) ethyl methacrylate (phenyl-P), 2-hydroxy-3- ( ⁇ -Naphthoxy) propyl methacrylate (HNPM), N-phenyl-N- (2-hydroxy-3-methacryloxy) propylglycine (NPG-GMA), ethylene glycol dimethacrylate (EDMA or 1G), diethylene glycol dimethacrylate (DiEDMA), triethylene glycol
- the acrylic monomers as mentioned above can be mentioned, but the solubility of the hydroxyl group-containing fluoropolymer (A-1), the isocyanate group-containing unsaturated compound (A-2) and the reaction product (A) is good. From the viewpoint, methyl methacrylate, ethyl methacrylate, methyl acrylate, and ethyl acrylate are preferable.
- the mass ratio of the reaction product (A) and the acrylic monomer (B) is preferably 95: 5 to 5:95, more preferably 80:20 to 20:80, and still more preferably 70:30 to 30:70.
- the mass ratio of the reaction product (A) and the acrylic monomer (B) is off from 95: 5 and the mass of the reaction product (A) is increased, the viscosity tends to be high and difficult to handle.
- the fluorine content decreases when the mass ratio of the reaction product (A) and the acrylic monomer (B) deviates from 5:95 and the mass of the reaction product (A) decreases, the curable composition is There is a tendency that the weather resistance, water / oil repellency and antifouling property of the cured product are lowered.
- the viscosity at 30 ° C. of the curable resin composition is preferably 5 mPa ⁇ s or more because the dripping is excessive when the viscosity is too low, and the handleability is lowered. From the viewpoint that the thin film formability is good, 10 mPa ⁇ s or more is more preferable, and 50 mPa ⁇ s or more is more preferable from the viewpoint that curing shrinkage during curing is small. Further, the viscosity at 30 ° C. of the curable resin composition is preferably 100000 mPa ⁇ s or less from the viewpoint of good handleability, and from the viewpoint that the curable composition spreads over the details during the molding process. s or less is more preferable, and 20000 mPa ⁇ s or less is more preferable from the viewpoint that the leveling (surface smoothness) is good when a thin film is formed.
- the curable resin composition (IX) may further contain a curing agent.
- the curing agent is a compound that crosslinks by reacting with the curing reactive group of the hydroxyl group-containing fluoropolymer (A-1).
- A-1 hydroxyl group-containing fluoropolymer
- isocyanates, amino resins, acid anhydrides having no unsaturated bond Polyepoxy compounds, isocyanate group-containing silane compounds and the like are usually used.
- isocyanates having no unsaturated bond include 2,4-tolylene diisocyanate, diphenylmethane-4,4′-diisocyanate, xylylene diisocyanate, isophorone diisocyanate, lysine methyl ester diisocyanate, and methylcyclohexyl diisocyanate.
- amino resins include, for example, urea resins, melamine resins, benzoguanamine resins, glycoluril resins, methylolated melamine resins obtained by methylolating melamine, and methylolated melamines by alcohols such as methanol, ethanol, and butanol.
- examples include etherified alkyl etherified melamine resins, but are not limited thereto.
- acid anhydrides include, but are not limited to, phthalic anhydride, pyromellitic anhydride, meritic anhydride, and the like.
- polyepoxy compound and the isocyanate group-containing silane compound those described in, for example, JP-A-2-232250 and JP-A-2-232251 can be used.
- JP-A-2-232250 and JP-A-2-232251 can be used as the polyepoxy compound and the isocyanate group-containing silane compound.
- the compounding amount of the curing agent is 0.1 to 5 equivalents, preferably 0.5 to 1.5 equivalents with respect to 1 equivalent of the chemical curing reactive group in the hydroxyl group-containing fluoropolymer (A-1). is there.
- the composition of the present invention can be cured usually at 0 to 200 ° C. for several minutes to about 10 days.
- the reaction product (A) and the acrylic monomer (B) are cured by UV irradiation when polymerized, and therefore a photopolymerization initiator is included in the curable resin composition. You may go out.
- photopolymerization initiators include acetophenone compounds such as acetophenone, chloroacetophenone, diethoxyacetophenone, hydroxyacetophenone, ⁇ -aminoacetophenone; benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl Benzoin compounds such as ether and benzyldimethyl ketal; benzophenone, benzoylbenzoic acid, methyl benzoylbenzoate, 4-phenylbenzophenone, hydroxybenzophenone, hydroxy-propylbenzophenone, acrylated benzophenone, Michler's ketone, 2-hydroxy-2-methylpropio Benzophenone compounds such as phenone; thioxanthone, chlorothioxanthone, methylthio Thioxanthones such as Sanson, Diethylthioxanthone, Dimethylthi
- photoinitiator adjuvants such as amines, sulfones, and sulfines, as needed.
- the curable resin composition (IX) does not include an organic solvent having no radical reactive group and a fluorine-based solvent does not require a step of removing the solvent after curing the curable resin composition.
- the curable resin composition (IX) can use the curing catalyst illustrated previously similarly to the curable resin composition (VIII).
- an organic solvent can also be mix
- organic solvent examples include hydrocarbon solvents such as xylene, toluene, Solvesso 100, Solvesso 150, and hexane, methyl acetate, ethyl acetate, butyl acetate, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether acetate, and ethylene glycol monoacetate.
- hydrocarbon solvents such as xylene, toluene, Solvesso 100, Solvesso 150, and hexane, methyl acetate, ethyl acetate, butyl acetate, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether acetate, and ethylene glycol monoacetate.
- Ester solvents such as butyl ether, acetic acid diethylene glycol monomethyl ether, acetic acid diethylene glycol monoethyl ether, acetic acid diethylene glycol monobutyl ether, acetic acid ethylene glycol, acetic acid diethylene glycol, dimethyl ether, diethyl ether, dibutyl ether, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene Glycol monobutyl ether, ethylene glycol dimethyl Ether ether, ethylene glycol diethyl ether, ethylene glycol dibutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol dibutyl ether, tetrahydrofuran and other ether solvents, methyl ethyl ketone, methyl isobuty
- the blending ratio of the weather resistant organic material and the alcohol solvent is 1 to 50 parts by weight of alcohol with respect to 100 parts by weight of the weather resistant organic material, and 1 to 25 parts by weight from the viewpoint of curability and coating film appearance. More preferably.
- the curing agent when the curing agent is highly reactive with an alcohol such as a room-temperature curable isocyanate, the content is preferably 1 to 15 parts by weight, and the type of alcohol is preferably a secondary or tertiary alcohol.
- the hydrophilic paint can further contain an ultraviolet absorber, a silane coupling agent and / or a hydrophilization accelerator.
- the coating film has an effect of improving the base protection and weather resistance.
- Specific examples include benzophenone-based and benzotriazole-based UV absorbers and cyanoacrylate-based UV absorbers.
- benzophenone-based UV absorbers are suitable for 2,2'-dihydroxy-4,4'-dimethoxy.
- Benzophenone, 2,2'-dihydroxy-4-methoxybenzophenone and 2,2 ', 4,4'-tetrahydroxybenzophenone are 2- (2'-hydroxy-5'-methylphenyl) benzotriazole in the benzotriazole series 2- (2'-hydroxy-5'-methylphenyl) -5,6-dichlorobenzotriazole), 2- (2'-hydroxy-5'-tert-butylphenyl) benzotriazole, 2- (2 ' -Hydroxy-3 ', 5'-di-tert-butylphenyl) -5-chloro -Benzotriazole, 2- (2'-hydroxy-5'-phenylphenyl) -5-chlorobenzotriazole, 2- (2'-hydroxy-3'-tertbutylphenyl) -5-chlorobenzotriazole, 2- ( 2'-hydroxy-3'-tertbutylphenyl) -5-chlorobenzotriazole, 2- ( 2'
- cyanoacrylate ultraviolet absorber for example, 2-ethylhexyl 2-cyano-3,3-diphenyl acrylate, ethyl 2-cyano-3,3-diphenyl acrylate, or the like can be used effectively.
- a particularly suitable UV absorber is represented by the following formula:
- R 10 and R 11 are the same or different and each represents a hydrogen atom, a lower alkyl group, particularly a branched lower alkyl group, or an aryl group, particularly a phenyl group, and X is a hydrogen atom. Atoms or halogen atoms, especially chlorine atoms). Further, cyanoacrylate ultraviolet absorbers are particularly preferred because they are less susceptible to hydrolysis.
- the silane coupling agent gives overcoat adhesion to the coating film.
- Specific examples include, for example, methyltrimethoxysilane, ethyltriethoxysilane, dimethyldimethoxysilane, trimethylmethoxysilane, vinyltrimethoxysilane, 3- (glycidyloxy) propyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-trimethoxysilylpropyl isocyanate, 3-tripropyl Examples thereof include ethoxysilylpropyl isocyanate and methyltris (ethylmethylketoxime) silane, and those containing an alkylketoxime group or an isocyanate group are preferred.
- hydrolysis of the organometallic compound having high hydrophilization ability is helped, and hydrophilization of the coating film surface is promoted.
- the resin for coating materials in an organic material is a curable type, it contributes to acceleration
- Specific examples include those listed above for the curing catalyst. From the viewpoint of hydrophilization, an organotin compound and an aluminum chelate compound are preferable.
- weather-resistant organic materials include thickeners, leveling agents, antifoaming agents, film-forming aids, HALS, matting agents, fillers, colloidal silica, fungicides, anti-skinning agents, antioxidants, Additives such as flame retardants, sagging inhibitors, antistatic agents, rust inhibitors, and water-soluble resins (polyvinyl alcohol, polyethylene oxide, etc.) can also be blended.
- a known method suitable for the application can be employed. For example, when it is necessary to control the film thickness, roll coating, gravure coating, micro gravure coating, flow coating, bar coating, spray coating, die coating, spin coating, dip coating, etc. are used. it can.
- an optimum one for the material is selected, but usually either a thermal imprint method or a photoimprint method is used.
- a thermal imprint method a thermoplastic material is used, and after being brought into close contact with the mold at a high temperature, the mold is released at a lower temperature.
- photoimprinting a photocurable resin or a sol / gel material is used, and after pouring the material into a mold, the material is mainly cured by irradiating ultraviolet rays, and then the mold release is performed.
- a known release agent such as OPTOOL DSX (trade name, manufactured by Daikin Industries, Ltd.), Durasurf HD-1100, 2100 series (trade name, manufactured by Harves) is applied and used as a release agent. May be.
- the light collecting film preferably collects light incident at an angle of 0 to 89 ° with respect to the normal direction of the light collecting film on an average of 80% or more.
- a conventional flat film using a computer generated hologram only a light-collecting film with a pattern having a binary gradation can be produced, so that light incident at a shallow angle with respect to the in-plane direction of the light-collecting film is sufficient.
- the light-collecting film of the present invention has a multi-value gradation pattern, even if it is light incident at an angle of 0 to 89 °, the light-collecting rate can be 80% or more on average.
- the light incident at an angle of 0 to 89 ° with respect to the normal direction of the light-collecting film is also light incident on a region having a multi-value gradation pattern.
- the said light condensing rate can be measured by the method using a light receiving element, you may calculate by the simulation using optical design software ZEMAX (made by TEM Co., Ltd.).
- the thickness of the light collecting film may be appropriately set depending on the intended use, but is preferably 0.03 to 20 mm, for example. More preferably, it is 0.1 to 5 mm. If it is the thickness of the said range, it can use suitably as a condensing film for solar cells.
- the said film thickness measures the maximum thickness of a condensing film using the film thickness meter.
- the condensing film preferably has a yellowing degree ⁇ YI value of 20 or less. More preferably, it is 10 or less, More preferably, it is 5 or less.
- the yellowing degree ⁇ YI value is a value obtained by measuring a light-collecting film obtained by conducting a saturated vapor pressure test in an atmosphere of 105 ° C. and 100% RH for 200 hours using a color difference meter.
- the manufacturing method of a condensing film includes the process of calculating a multi-value gradation pattern by discrete Fourier transform, and the process of forming the condensing film which has this multi-value gradation pattern.
- the manufacturing method of a condensing film includes the process of calculating a multi-value gradation pattern by discrete Fourier transform, and the process of forming the condensing film which has this multi-value gradation pattern.
- the manufacturing method of a condensing film includes the process of calculating a multi-value gradation pattern by discrete Fourier transform, and the process of forming the condensing film which has this multi-value gradation pattern.
- a method of manufacturing a light-collecting film includes a step of forming a template having a reversal pattern of a multi-value gradation pattern calculated by discrete Fourier transform, and contacting the template with a film made of an organic material, thereby producing a multi-value gradation pattern. It is one of the preferred embodiments that includes a step of forming a light-condensing film having a multi-value gradation pattern by injection molding using the mold as a mold.
- the mold is a light source such as an electron beam (EB), an argon laser (363 nm light source wavelength), a blue semiconductor laser (405 nm light source wavelength), a krypton laser (413 nm light source wavelength), or a helium-cadmium laser (442 nm light source wavelength). It can be manufactured using a photolithography method in which exposure is performed by irradiating while changing the intensity depending on the location. In the case of producing a mold, when the resist is developed after exposure, an uneven resist having a multi-value gradation is formed according to the intensity of a light source such as an irradiated electron beam.
- EB electron beam
- argon laser 363 nm light source wavelength
- a blue semiconductor laser (405 nm light source wavelength
- a krypton laser (413 nm light source wavelength
- a helium-cadmium laser 442 nm light source wavelength
- a metal mold is obtained by performing ashing with plasma, or depositing a metal film and performing electroforming, and then releasing the substrate and the resist.
- the material of the mold is not particularly limited, but for example, a metal material such as nickel or silicon, quartz, glass or the like is preferable.
- the “inverted pattern of the multi-value gradation pattern” is a pattern in which the concavo-convex shape is opposite to that of the multi-value gradation pattern, and the multi-value gradation pattern is obtained when the inversion pattern is brought into contact with the target organic material.
- a tone pattern can be formed.
- FIG. 2 is a schematic cross-sectional view showing an example of a mold.
- the mold 2 has a reversal pattern corresponding to the multi-value gradation pattern of the light collecting film shown in FIG. 1. For example, by bringing the mold 2 having the reversal pattern 21 into contact with an organic material film, A condensing film having a value gradation pattern can be formed.
- a method of bringing the mold into contact with an organic material a method of transferring a multi-value gradation pattern by bringing a surface of the mold on which a reverse pattern is formed into contact with a film made of an organic material, and injecting the mold as a mold
- the method include molding.
- the manufacturing method of the said condensing film includes the process of irradiating a film which consists of organic materials with a laser, and forming the condensing film which has a multi-value gradation pattern.
- a multi-value gradation pattern calculated by the above-described discrete Fourier transform is directly drawn on the film made of an organic material with a laser to form a light-collecting film having the multi-value gradation pattern. It is distinguished from a hologram created by laser imprinting.
- a laser used when irradiating a film made of an organic material with a laser a laser used in the photolithography method can be used.
- the condensing film of the present invention can be used in various optical fields.
- the light condensed by the light collecting film can be used for solar cells, buildings, commercial facilities, general household lighting, and the like.
- illumination for example, it is also effective as a substitute for illumination in a plant factory (LED or the like) or TV backlight.
- the light-collecting film of the present invention can also diffuse incident light, and is effective as an alternative to a diffusion plate that diffuses light emitted from an LED light source used in, for example, an LED television.
- This invention is also a condensing element provided with the said condensing film. Since the condensing element of this invention enables condensing in a wide angle range with the said condensing film, in-plane condensing efficiency can be improved significantly.
- the condensing element of this invention should just be provided with the said condensing film at least, and a shape may be planar shape, dome shape (hemispherical shape), etc.
- the condensing element preferably includes a condensing film and a lens. Examples of the lens include, but are not limited to, a prism lens, a fly-eye lens, a lens array, a linear Fresnel lens, a Fresnel lens described later, a lenticular lens, and the like.
- the lens is preferably made of a fluororesin.
- a fluororesin used for a lens the fluororesin illustrated about the condensing film mentioned above is illustrated preferably.
- a preferable fluororesin is at least one fluororesin selected from the group consisting of ETFE, PCTFE, EFEP, FEP, and PVdF.
- the condensing element preferably includes at least one lens selected from the group consisting of a Fresnel lens and a lenticular lens.
- the Fresnel lens and the lenticular lens are not particularly limited as long as they are generally called Fresnel lenses or lenticular lenses.
- the light condensed in the plane in all directions by the light collecting film can be further condensed at one point by the Fresnel lens or the lenticular lens. Even if it is only a light collecting film, it is possible to collect light in all directions, but by using a light collecting film and a Fresnel lens or lenticular lens in combination, control of the light collecting distance and light density are increased, It becomes easy to dramatically improve the power generation efficiency.
- the condensing film of the present invention controls the result of the computer generated hologram to collect sunlight rays in-plane, and is more uniform and non-aberration than conventional Fresnel lenses and lenticular lenses. It is also possible to develop a fine single point condensing function.
- This invention is also a solar cell provided with the said condensing element.
- the solar cell is preferably a tracking or non-tracking solar cell, and more preferably a non-tracking solar cell.
- the solar cell of this invention contains the said condensing element and a photovoltaic cell.
- the solar battery cell only needs to be capable of generating power by receiving light, and examples thereof include a pn junction of an n-type semiconductor and a p-type semiconductor.
- the n-type semiconductor and the p-type semiconductor that can be used are not particularly limited, and materials usually used for solar cells can be used.
- group IV semiconductors such as Si and Ge
- group III-V compound semiconductors such as GaAs, InP, and AlGaAs
- group II-VI compound semiconductors such as CdS, CdTe, and Cu 2 S, CuInSe 2 , CuInS 2, Cu (In , Ga) Se 2 and the like
- I-III-VI group compound semiconductors organic semiconductors such as phthalocyanine and polyacetylene, and laminates of three junctions such as InGaP / (In) GaAs / Ge.
- the solar battery cell can be used regardless of crystal type or amorphous type (amorphous).
- the solar battery includes a wiring connected to the solar battery cell.
- the structure of the solar cell is not particularly limited, and another member having translucency may be interposed between the condensing element and the solar cell, and the condensing film (collector) is disposed on the solar cell.
- the structure may be such that the optical element) is directly bonded.
- the form provided with the condensing element 35 which has the structure where the Fresnel lens 32 and the condensing film 31 were adhere
- the light collected in-plane by the light collecting film 31 is further condensed at one point by the Fresnel lens 32, and the light condensed by the solar battery cell 34 is received.
- a photovoltaic cell can be made small and cost reduction can be aimed at.
- the present invention is a light condensing method using the light condensing film, wherein the light is incident on the surface of the light condensing film having the multi-value gradation pattern, and opposite to the light incident surface of the light condensing film. And a step of emitting incident light from the surface.
- FIG. 6 is a schematic view showing a light collecting method using the light collecting film.
- the light 63 incident on the surface 62 having the multi-value gradation pattern of the condensing film 61 is converted into the surface 63 opposite to the surface having the multi-value gradation pattern. It can be emitted from.
- the condensing method includes a step of making an angle of the light emitted from the condensing film with respect to the normal direction of the condensing film smaller than an angle of the light incident on the condensing film with respect to the normal direction of the condensing film, It is preferable.
- the incident light preferably has an angle of 89 ° or less with respect to the normal direction of the light collecting film. Further, it is preferable that the condensing method collects light incident at an angle of 0 to 89 ° with respect to the normal direction of the condensing film on an average of 80% or more.
- the light incident at an angle of 0 to 89 ° with respect to the normal direction of the light-collecting film is preferably light incident on a region having a multi-value gradation pattern.
- Examples of the light-collecting film of the present invention include solar cells, light-collecting applications for lighting in buildings, commercial facilities, general homes, microfluidic devices, optical devices, recording media, and LED diffusers. It is done.
- Examples of the microfluidic device include a microreactor chip and a micro TAS.
- Examples of the optical device include a microlens and an optical element.
- Examples of the article of the present invention further include a biochip, an antireflection filter, and a catalyst carrier.
- the condensing film of the present invention has the above-described configuration, thereby allowing condensing in a wide angle range (for example, omnidirectional condensing). Moreover, it can be set as the condensing film which has long-term stability by using a fluororesin. When used as an optical member of a solar cell, it is possible to improve power generation efficiency and reduce costs by improving the light collection efficiency.
- (C) is a plane schematic diagram of the condensing film whose concave part is a triangle when viewed in cross section
- (d) is a schematic plan view of the condensing film whose concave part is a semicircle when viewed in plan. is there.
- (E) is a plane schematic diagram of the condensing film which is the ellipse with which the recessed part continued when planarly viewed.
- an ETFE film (trade name: NEOFLON ETFE, manufactured by Daikin Industries, Ltd.) was used. The production of the light collecting film will be described.
- a mold having a reversal pattern of a multi-value gradation pattern calculated by a discrete Fourier transform was produced using a photolithography method.
- the resist applied on the silicon substrate was exposed and irradiated using an electron beam (EB) while changing the intensity depending on the location. Thereafter, the resist was developed to form a concavo-convex resist film having a multi-value gradation in accordance with the intensity of a light source such as an irradiated electron beam.
- EB electron beam
- the metal template is formed on a film of an alternating copolymer of tetrafluoroethylene-ethylene, which is an organic material (manufactured by Daikin Industries, Ltd., NEOFLON film ETFE, thermal deformation temperature 104 ° C., film thickness 100 ⁇ m) and nanoimprint apparatus NANOIMPRINTER NM.
- ⁇ 0401 manufactured by Myeongchang Kiko Co., Ltd.
- the metal rectangular mold having 4 gradations was pressed at room temperature for 5 minutes at a pressure of 30 MPa to form a condensing film having a multi-value gradation pattern.
- the obtained light-condensing film has a processed rectangular maximum thickness (maximum thickness of a region having a multi-value gradation pattern) in a region having a multi-value gradation pattern, which is 1000 nm, and a minimum thickness (multi-value gradation).
- the minimum thickness of the region having the tone pattern) was 250 nm.
- the film was peeled off with tweezers, and the pattern shape formed on the film surface was observed with a scanning electron microscope [SEM] and an atomic force microscope [AFM]. As a result, it was confirmed that the shape of the mold (mold) was accurately transferred to the obtained light-collecting film.
- the film thickness of the transferred film was measured from a sectional view of SEM (manufactured by Hitachi High-Technologies Corporation).
- An imprint apparatus 53 is used while continuously extruding a fluororesin film 50 made of ETFE film or PCTFE (trade name: NEOFLON ETFE or PCTFE, manufactured by Daikin Industries, Ltd.) from a film roll 51 as shown in FIG. Then, the mold 52 having the reversal pattern of the multi-value gradation pattern is brought into contact with the fluororesin film 50, the multi-value gradation pattern is transferred to the fluororesin film 50, and then laminated by a plurality of rolls 54. It is also possible to form a light collecting film capable of collecting light in all directions by cutting into a desired size using a cutting machine 55.
- a Fresnel lens composed of various fluorine films such as an ETFE film and a light-collecting film manufactured by the above-described method for example, an adhesive (trade name: UV-absorbing pressure-sensitive adhesive XN-507, manufactured by Otsuka Kogyo Co., Ltd.) ), And a highly transparent adhesive sheet (trade name: highly transparent adhesive transfer tape 8171J, manufactured by 3M), an acrylic adhesive, a thermoplastic resin, and a thermoplastic resin (EVA) containing a thermosetting agent.
- the condensing element is formed by using and adhering.
- a condensing element having an omnidirectional ability or a condensing element having an omnidirectional and one-point condensing function can be obtained. . Therefore, a highly efficient solar cell can be manufactured.
- the light transmittance of the organic material constituting the light collecting film is 90%
- the refractive index is 1.50
- the film thickness (maximum film thickness) of the light collecting film is 100 ⁇ m
- the area of the light collecting film is A binary gradation pattern was calculated using fast Fourier transform under the condition of 160 mm ⁇ .
- a PMMA base material thickness: 2 mm, manufactured by Nippon Special Optical Resin Co., Ltd.
- the graph of FIG. 4 shows the result of the solar condensing simulation when the gradation pattern obtained by the calculation is used.
- the condensing film having the multi-value gradation pattern obtained in Example 1 exhibits a high condensing rate of 95% or more on average with respect to a wide angle of light incident angle. It can be seen that in the light collecting film having the binary gradation pattern obtained in 1, the light collecting rate in all directions is remarkably lowered as the light incident angle increases. Furthermore, as a result of actual measurement, performance according to the simulation curve was developed.
- the condensing film of this invention has the said structure, it can be utilized in wide field
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Abstract
Description
以下に本発明を詳細に説明する。
本発明の集光フィルムは、多値階調パターンを有する。多値階調パターンを有することで、広い角度範囲での面内集光が可能となる。多値階調パターンは、計算機多値ホログラムグレーティングパターン等ともいわれるパターンである。
本明細書中で「多値階調パターン」は、計算機により算出された多値の階調を有するパターンである。「多値階調」とは、3以上の値を有する階調を意味し、2値の階調とは区別される。また、有機材料にレーザインプリントしたホログラム回折パターンのような、位相情報が記録された波形パターンとも区別されるものである。ここで、「階調」は、集光フィルムの膜厚変化の度合いを意味し、例えば、多値階調パターンを有する集光フィルムでは、3段階以上の膜厚の値を有するものとなる。
L/da≦2 (α)
を満たすことが好ましい。
例えば、図1に示される階調パターンの凹部11dにおいては、凹部11dの幅Lfと階調パターンの深さ方向(法線方向)への端面距離daがLf/da≦2を満たすとき、上記のように広い角度範囲の入射光を任意の一方向に集める面内集光フィルムとしての機能がより優れたものとなる。上記多値階調パターンを構成する凹部は、最小の幅を有する凹部が上記式(α)を満たせばよく、実質的に全ての凹部が上記式(α)を満たすことがより好ましい。実質的に全ての凹部が上記式(α)を満たす場合において、側面部を有していない凹部が存在するときには、当該凹部は上記式(α)を満たすものではない。なお、凹部の端面深さ(端面距離)daは、多値諧調パターンにおける各階段端面の長さを示し、凹部の側面部において、集光フィルムの法線方向に最も短い側面部(端面)の長さである。
離散フーリエ変換を用いることにより、演算速度を飛躍的に向上させ、高品質で大面積の計算機ホログラムを計算することが可能であり、計算機ホログラムを集光フィルムに適用することが可能となる。
また、集光フィルムは、該集光フィルムの法線方向に対して0°~89°の角度で入射した550nmの波長の光線透過率が実質的に全ての角度で80%以上であることが好ましい。より好ましくは、90%以上であり、更に好ましくは95%以上である。なお、法線方向に対して0°の角度とは、垂直軸の角度を示し、また法線方向に対して89°の角度とは、水平軸1°の角度を示す。なお、光線透過率は0~89°の範囲を2°毎に測定した値を、測定した値の数で平均化した値を採用することができる。集光フィルムの法線方向に対して0~89°の角度で入射した550nmの波長の光線透過率は、多値階調パターンを有する領域に入射した550nmの波長の光線透過率であることも好ましい。
また、これらの熱可塑性樹脂の他、これら樹脂上に対するコーティング層として後述する硬化性樹脂などの高分子材料や、ゾル・ゲル材料等として用いられる有機・無機のナノ複合材料等も利用することが可能である。
フッ素樹脂は、耐候性、耐熱性、耐水蒸気透過性、透明性等に優れるため、太陽光線等による素材の劣化を防ぎ、長期耐久性を有する集光フィルムとすることができる。また、光透過性にも優れている。
CH2=CZ7Rf 3、CF2=CFRf 3、CF2=CFORf 3、CH2=C(Rf 3)2
(式中、Z7は水素原子またはフッ素原子、Rf 3はエーテル結合性酸素原子を含んでいてもよいフルオロアルキル基を表す。)
で表される単量体が挙げられ、なかでも、CF2=CFRf 3、CF2=CFORf 3及びCH2=CZ7Rf 3で表される含フッ素ビニルモノマーが好ましく、HFP、CF2=CF-ORf 4(式中、Rf 4は炭素数1~5のパーフルオロアルキル基を表す。)で表されるパーフルオロ(アルキルビニルエーテル)〔PAVE〕及びRf 3が炭素数1~8のフルオロアルキル基であるCH2=CZ7Rf 3で表される含フッ素ビニルモノマーがより好ましい。
本明細書において、各樹脂の融点は、DSC装置(セイコー社製)を用い、10℃/分の速度で昇温したときの融解熱曲線における極大値に対応する温度として求めたものであり、MFRは、メルトインデクサー(東洋精機製作所社製)を用い、各温度、5kg荷重下で直径2mm、長さ8mmのノズルから単位時間(10分間)に流出するポリマーの重量(g)を測定したものである。
以下、本発明の集光フィルムに用いることができる有機材料について更に説明する。上記有機材料としては、上記した熱可塑性樹脂等の他、それら樹脂上などへのコーティング層として、硬化性樹脂などの高分子材料や、ゾル・ゲル材料等として利用する有機・無機のナノ複合材料等も用いることも可能である。
熱可塑性樹脂からなる樹脂上などへのコーティング層として用いられる硬化性樹脂は、基材上へのコーティング、または樹脂単体して塗膜を形成する塗料として用いられることが好ましい。すなわち、塗料として用いた場合、硬化性樹脂を基材に塗布し、硬化させた後、基材から剥がしてフィルムとしてもよいし、可能であれば、基材上に配置されたまま集光フィルムに加工してもよい。
以下に、これらの有機材料について説明する。
本発明の集光フィルムを構成する有機材料としては特に限定されないが、耐候性有機材料であることが好ましい。耐候性有機材料としては、上述した熱可塑性樹脂等の他、それら樹脂上などへのコーティング層として、硬化性樹脂などの高分子材料等が挙げられる。耐候性有機材料は、フッ素樹脂からなる有機材料であることが好ましい。フッ素樹脂からなる有機材料としては、上述したフッ素樹脂からなる有機材料等が挙げられるが、例えば、熱可塑性フッ素樹脂からなる有機材料、(I)水酸基および/またはカルボキシル基を有するフルオロオレフィン共重合体、(V)フッ素シリコーン樹脂、(VI)官能基を有していないフッ化ビニリデンの単独重合体もしくは共重合体、及び、(VII)官能基を有しないフッ素樹脂、からなる群より選択される少なくとも1種の化合物からなる有機材料、又は、下記硬化性樹脂組成物(VIII)及び下記硬化性樹脂組成物(IX)からなる群より選択される少なくとも1種の有機材料が好ましい。
上記熱可塑性フッ素樹脂は、耐加水分解の点で好ましい。上記(I)、(V)、(VI)、(VII)、(VIII)、(IX)で示される化合物からなる有機材料又は硬化性樹脂組成物は、耐光性の点で好ましい。上記耐候性有機材料は、溶剤可溶性であることが好ましい。
Z8 eM(OR22)dR23 f (1)
[式中、dは0または1~6の整数、eは0または1~5の整数、fは0または1~6の整数(ただし、d+e+f≧3であり、dとfとは同時に0にはならない)、Z8は同じかまたは異なりいずれも酸素原子、チッ素原子、フッ素原子および/または塩素原子を含んでいてもよい炭素数1~5000の1価の有機基または水素原子、Mは少なくとも3価の原子価を有する金属原子、R22は同じかまたは異なりいずれも酸素原子、チッ素原子、フッ素原子および/または塩素原子を含んでいてもよい炭素数1~1000の1価の有機基、シロキサン残基または水素原子、R23は同じかまたは異なりいずれも酸素原子、チッ素原子、フッ素原子および/または塩素原子を含んでいてもよいキレート化の能力を有する炭素数1~20の有機基を表す]で示される有機金属化合物、特にR22またはR23の少なくとも1つが含フッ素基である含フッ素有機金属化合物が好ましい。
テトラフルオロエチレン/バーサティック酸ビニル/ヒドロキシブチルビニルエーテル;テトラフルオロエチレン/バーサティック酸ビニル/ヒドロキシエチルビニルエーテル/tert-ブチル安息香酸ビニル;テトラフルオロエチレン/バーサティック酸ビニル/ヒドロキシブチルビニルエーテル/クロトン酸;テトラフルオロエチレン/バーサティック酸ビニル/ヒドロキシエチルビニルエーテル/安息香酸ビニル/クロトン酸があげられる。
上記メタクリレートモノマーまたは水酸基含有メタクリレートモノマーに対応する2-フルオロアクリレート、
CH2=C(CH3)COOCH2CF3(3FMA)、
CH2=C(CH3)COOCH2CF2CF2H(4FMA)、
CH2=C(CH3)COOCH2CF2CF3(5FMA)、
CH2=C(CH3)COOCH2CF2CFHCF3(6FMA)、
CH2=C(CH3)COOCH2(CF2)3CF2H(8FMA)、
CH2=C(CH3)COOCH2CH2(CF2)3CF3(9FMA)、
CH2=C(CH3)COOCH2(CF2)5CF2H(12FMA)、
CH2=C(CH3)COOCH2CH2(CF2)5CF3(13FMA)、
CH2=C(CH3)COOCH2CH2(CF2)7CF3(17FMA)、
CH2=C(CH3)COOCH(CF3)2(HFIP-MA)、
CH2=C(CH3)COOCH2CCH3(CF3)2(6FNP-MA)、
CH2=C(CH3)COOCH2CF(CF3)OCF2CF2CF3(6FOn1-MA)、
また、これらに対応する各アクリレート、各2-フルオロアクリレート、各2-クロロアクリレートを例示することができる。
CH2=CFCOOCH2CF2CF2H(4FFA)、
CH2=CFCOOCH2CF2CF3(5FFA)、
CH2=CFCOOCH2(CF2)3CF2H(8FFA)、
CH2=CFCOOCH2(CF2)5CF2H(12FFA)、
CH2=CFCOOCH(CF3)2(HFIP-FA)
などを例示することができる。
さらに、酸性リン酸エステル、酸性リン酸エステルとアミンとの反応物、飽和または不飽和の多価カルボン酸またはその酸無水物、有機チタネート化合物、アミン系化合物、オクチル酸鉛などがあげられる。
で示される水酸基含有含フッ素エチレン性単量体である。中でも式(II)で示される水酸基含有含フッ素エチレン性単量体がより好ましい。
などがあげられる。
-CH2-CF2-、
-CH2-CF(CF3)-、
などがあげられる。
CH2=CHCOOCH2CH2NCO (V)
で表される2-イソシアネートエチルアクリレート、式(VI):
CH2=C(CH3)COOCH2CH2NCO (VI)
で表される2-イソシアネートエチルメタクリレート、式(VII):
CH2=C(CH3)COOCH2CF3(3FMA)、
CH2=C(CH3)COOCH2CF2CF2H(4FMA)、
CH2=C(CH3)COOCH2CF2CF3(5FMA)、
CH2=C(CH3)COOCH2CF2CFHCF3(6FMA)、
CH2=C(CH3)COOCH2(CF2)3CF2H(8FMA)、
CH2=C(CH3)COOCH2CH2(CF2)3CF3(9FMA)、
CH2=C(CH3)COOCH2(CF2)5CF2H(12FMA)、
CH2=C(CH3)COOCH2CH2(CF2)5CF3(13FMA)、
CH2=C(CH3)COOCH2CH2(CF2)7CF3(17FMA)、
CH2=C(CH3)COOCH(CF3)2(HFIP-MA)、
CH2=C(CH3)COOCH2CCH3(CF3)2(6FNP-MA)、
CH2=C(CH3)COOCH2CF(CF3)OCF2CF2CF3(6FOn1-MA)、
また、これらに対応する各アクリレート、各2-フルオロアクリレート、各2-クロロアクリレートを例示することができる。
CH2=CFCOOCH2CF2CF2H(4FFA)、
CH2=CFCOOCH2CF2CF3(5FFA)、
CH2=CFCOOCH2(CF2)3CF2H(8FFA)、
CH2=CFCOOCH2(CF2)5CF2H(12FFA)、
CH2=CFCOOCH(CF3)2(HFIP-FA)
などを例示することができる。
OCNC2H4Si(OCH3)3
などがあげられる。
また、硬化性樹脂組成物(IX)も硬化性樹脂組成物(VIII)と同様に、先に例示した硬化触媒を用いることが可能である。
上記膜厚は、膜厚計を用いて、集光フィルムの最大厚みを測定したものである。
黄変度ΔYI値は、飽和蒸気加圧試験を105℃、100%RHの雰囲気下で、200時間行った集光フィルムを、色差計によって測定して得られる値である。
なお、「多値階調パターンの反転パターン」とは、多値階調パターンとは凹凸形状が逆のパターンであり、該反転パターンを目的とする有機材料に接触させた場合に、多値階調パターンを形成することができるものである。図2は、鋳型の一例を示す断面模式図である。例えば、鋳型2は、図1に示す集光フィルムの多値階調パターンに対応する反転パターンを有するものであり、例えば、反転パターン21を有する鋳型2を有機材料フィルムと接触させることで、多値階調パターンを有する集光フィルムを形成することができる。
更に、本発明の集光フィルムは、入射した光を拡散させることもでき、例えば、LEDテレビなどに用いられるLED光源から出射された光を拡散させる拡散板の代替としても有効である。
なお、本発明の集光フィルムは、計算機ホログラムの結果を制御することにより、太陽光線を面内集光させる他、従来のフレネルレンズやレンチキュラレンズに比べてより均一で無収差であり、かつ高精細な一点集光の機能を発現させることも可能である。
また、上記集光方法は、集光フィルムの法線方向に対して0~89°の角度で入射した光を平均80%以上集光するものであることが好ましい。集光フィルムの法線方向に対して0~89°の角度で入射した光は、多値階調パターンを有する領域に入射した光であることも好ましい。
上記光学デバイスとしては、例えば、マイクロレンズ、光学素子が挙げられる。本発明の物品として、更に、バイオチップ、反射防止フィルター、触媒担持体等も挙げられる。
(実施例1)
フーリエ変換装置を用いて、集光フィルムを構成する有機材料の光線透過率が95%、屈折率が1.40、集光フィルムの膜厚(最大膜厚)を100um、集光フィルムを直径160mmφの円形とする条件で、離散フーリエ変換を用いて多値階調パターンを計算した。
多値階調パターンを形成する有機材料フィルムとしては、ETFEフィルム(商品名:ネオフロンETFE、ダイキン工業株式会社製)を用いた。
集光フィルムの製造に関して説明する。離散フーリエ変換により計算した多値階調パターンの反転パターンを有する鋳型は、フォトリソグラフィ法を用いて作製した。まず、シリコン基板上に塗布したレジストに対して、電子線(EB)を用いて、場所によって強度を変化させながら露光照射した。その後、レジストを現像して、照射した電子線等の光源強度に応じて多値階調を有する凹凸のあるレジスト膜を形成した。このレジスト膜にニッケルを金属蒸着した後、基板とレジスト膜とを離型した。これにより、4階調からなり、線幅(ピッチ)が500nm、1階調の高さが250nmである金属矩形状鋳型(モールドサイズ15cm×15cm)が得られた。この多値階調パターンの反転パターンを有する金属鋳型のSEM写真を図8(a)及び(b)に示す。
なお、上述のように多値階調パターンを形成した後、フィルムをピンセットで剥がし、フィルム表面に形成されたパターン形状を走査型電子顕微鏡〔SEM〕と原子間力顕微鏡〔AFM〕で観察した。その結果、得られた集光フィルムには、鋳型(モールド)の形状が正確に転写されていることが確認された。なお、転写されたフィルムの膜厚は、SEM(株式会社日立ハイテクノロジーズ製)の断面図より測定した。
ETFEフィルムまたはPCTFE(商品名:ネオフロン ETFEまたはPCTFE、ダイキン工業株式会社製)からなるフッ素樹脂フィルム50を、図5で示すように、フィルムロール51から連続して押し出しながら、インプリント装置53を用いて、多値階調パターンの反転パターンを有する鋳型52をフッ素樹脂フィルム50に接触させて、多値階調パターンをフッ素樹脂フィルム50に転写して、その後、複数のロール54によって、ラミネート加工を行い、切断機55を用いて所望の大きさに切断し、全方位集光が可能な集光フィルムを形成することも可能である。
ETFEフィルム等の各種フッ素フィルムから構成されるフレネルレンズと、上述の方法で製造した集光フィルムとを、例えば接着剤(商品名:紫外線吸収性付与型粘着剤 XN-507、一方社油脂工業製)や、アクリル系粘着剤を使用した高透明性接着シート(商品名:高透明性接着剤転写テープ 8171J 3M社製)、熱可塑性樹脂、さらに熱硬化剤を含んだ熱可塑性樹脂(EVA)を用いて接着することで集光素子を形成する。このような集光素子を、太陽電池セルに対して一定の間隔を置いて設置することにより、全方位能を有する集光素子または、全方位かつ一点集光機能を有する集光素子が得られる。そのため高効率な太陽電池を製造することができる。
フーリエ変換装置を用いて、集光フィルムを構成する有機材料の光線透過率が90%、屈折率が1.50、集光フィルムの膜厚(最大膜厚)を100um、集光フィルムの面積を160mmφ、とする条件で、高速フーリエ変換を用いて二値の階調パターンを計算した。二値の階調パターンを形成する有機材料としては、PMMA基材(厚さ:2mm、日本特殊光学樹脂社製)を用いた場合を想定している。
2、52:鋳型
11、11a、11b、11c、11d、11e、11f:凹部
12:底部
13:側面部
21:反転パターン
32:接着層
33:フレネルレンズ
34:太陽電池セル
35:集光素子
51:フィルムロール
53:インプリント装置
54:ロール
55:切断機
61:多値階調パターンを有する面
62:多値階調パターンを有する面の反対面
70:サンプリング回路
71:位相補正部
710~71m-1:位相補正器
72:フーリエ変換部
720~72m-1:FFT演算器
73:合成器
74:位相補正器
75:フーリエ変換装置
Claims (15)
- 有機材料からなる透過型の集光フィルムであって、
多値階調パターンを有することを特徴とする集光フィルム。 - 集光フィルムの法線方向に対して0°~89°の角度で入射した光を平均80%以上集光する請求項1記載の集光フィルム。
- 多値階調パターンを有する領域において、最大厚みに対する最小厚みが25%以下である請求項1又は2記載の集光フィルム。
- 多値階調パターンは、深さの異なる2以上の凹部を組み合わせて構成されるパターンであり、
少なくとも一つの凹部の深さが、該凹部の幅よりも大きい、請求項1、2又は3記載の集光フィルム。 - 有機材料は、1.30~1.65の屈折率を有する請求項1、2、3又は4記載の集光フィルム。
- 有機材料は、フッ素樹脂である請求項1、2、3、4又は5記載の集光フィルム。
- 多値階調パターンは、集光フィルムの法線方向に対して0°~89°の角度で入射した光を平均80%以上集光するように、離散フーリエ変換を用いて計算されたパターンである請求項1、2、3、4、5又は6記載の集光フィルム。
- 請求項1、2、3、4、5、6又は7記載の集光フィルムを備えることを特徴とする集光素子。
- 更に、フレネルレンズ及びレンチキュラレンズからなる群より選択される少なくとも1つのレンズを備える請求項8記載の集光素子。
- レンズはフッ素樹脂からなる請求項9記載の集光素子。
- 請求項8、9又は10記載の集光素子を備えることを特徴とする太陽電池。
- 請求項1、2、3、4、5、6又は7記載の集光フィルムを製造する方法であって、
離散フーリエ変換を用いて多値階調パターンを計算する工程、及び
該多値階調パターンを有する集光フィルムを形成する工程、
を含むことを特徴とする集光フィルムの製造方法。 - 集光フィルムを形成する工程は、離散フーリエ変換により計算した多値階調パターンの反転パターンを有する鋳型を形成する工程、及び、
該鋳型を有機材料からなるフィルムに接触させて、多値階調パターンを有する集光フィルムを形成する工程、
を含むことを特徴とする請求項12記載の集光フィルムの製造方法。 - 集光フィルムを形成する工程は、有機材料からなるフィルムにレーザを照射して、多値階調パターンを有する集光フィルムを形成する工程、
を含むことを特徴とする請求項12記載の集光フィルムの製造方法。 - 請求項1、2、3、4、5、6又は7記載の集光フィルムを用いる集光方法であって、
集光フィルムの多値階調パターンを有する面に光を入射する工程、及び、
集光フィルムの光が入射された面とは反対の面から、入射された光を出射する工程、
を含むことを特徴とする集光方法。
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US13/393,920 US9176474B2 (en) | 2009-09-11 | 2010-09-10 | Light-concentrating film, method for producing same, focusing element, solar cell, and focusing method |
EP10815452.7A EP2477051A4 (en) | 2009-09-11 | 2010-09-10 | FOCUSING FILM, METHOD FOR PRODUCING THE SAME, FOCUSING ELEMENT, AND FOCUSING METHOD |
CN201080040273.9A CN102483482B (zh) | 2009-09-11 | 2010-09-10 | 聚光膜及其制造方法、聚光元件、太阳能电池以及聚光方法 |
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CN103842899A (zh) * | 2012-03-03 | 2014-06-04 | 本田制锁有限公司 | 电致变色镜 |
WO2020066981A1 (ja) * | 2018-09-25 | 2020-04-02 | Scivax株式会社 | 回折光学素子およびこれを用いたドットプロジェクタ等の光学系装置 |
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WO2007081876A2 (en) * | 2006-01-04 | 2007-07-19 | Liquidia Technologies, Inc. | Nanostructured surfaces for biomedical/biomaterial applications and processes thereof |
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CN103842899A (zh) * | 2012-03-03 | 2014-06-04 | 本田制锁有限公司 | 电致变色镜 |
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CN103842899B (zh) * | 2012-03-03 | 2017-03-08 | 本田制锁有限公司 | 电致变色镜 |
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US20120156434A1 (en) | 2012-06-21 |
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CN102483482B (zh) | 2016-01-20 |
JP5287989B2 (ja) | 2013-09-11 |
EP2477051A4 (en) | 2014-03-12 |
JPWO2011030858A1 (ja) | 2013-02-07 |
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US9176474B2 (en) | 2015-11-03 |
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