TW201540758A - Composition and method of forming a composition configured to transmit light equally across a light spectrum - Google Patents

Abstract

A composition configured to transmit light equally across a light spectrum, the composition comprising an optical polymer and an additive that differentially absorbs light within a wavelength range in the light spectrum.

Description

Composition of light configured to uniformly transmit the entire spectrum and method of forming the same

The subject matter described herein pertains to compositions and methods of forming compositions and cured products thereof that are configured to equally transmit light throughout the spectrum. The compositions include optical polymers and additives that differentially absorb light in the wavelength range of the visible light spectrum.

【Detailed description】

The compositions described herein are configured to equally transmit light throughout the visible spectrum. In one embodiment, the composition includes an optical polymer and an additive that differentially absorbs light in the wavelength range of the visible light spectrum such that the composition uniformly transmits light throughout the visible spectrum. By "in such a way" means that the additive is a material that absorbs relatively more light at some wavelengths in the visible light spectrum and absorbs relatively less light at other wavelengths in the visible light spectrum, such that entering the composition or curing the a cured product of the composition (ie, a cured product formed by curing the composition) and transmitted through the white light of the composition or the cured product, leaving the composition or the cured product and still being white light (eg, not yellow light) Or Blu-ray). That is, the The additive has counterbalanced light absorption properties. The light absorbing properties of the additive counterbalance or correct for differential light absorption/transmission characteristics of the composition or cured product.

In the absence of this additive, the optical polymer is a material that exhibits a natural color shift when measuring the light absorptivity of the entire visible spectrum. For example, the optical polymer can be a material that will differentially absorb light throughout the visible spectrum. For example, the optical polymer can absorb relatively more light at the shortest wavelength of the visible light spectrum and gradually absorb relatively less light as the wavelength increases throughout the visible spectrum. Alternatively, the optical polymer can be a material that transmits relatively less light at the shortest wavelength of the visible light spectrum and gradually transmits relatively more light as the wavelength increases throughout the visible spectrum. Such optical polymers can undesirably cause a color shift toward the yellow region of the visible light spectrum such that white light that is transmitted through the optical polymer and that is white when entering the optical polymer appears yellow when exiting the optical polymer. This color shift can be observed as a positive oblique transmission line from a shorter wavelength (e.g., 360 nm) to a longer wavelength (e.g., 700 nm) in a transmittance versus wavelength graph.

In the compositions of the present invention, the additive is selected such that the additive differentially absorbs light throughout the visible spectrum in a manner that compensates or counteracts the visible light absorption of the optical polymer. For example, the additive can absorb light of certain wavelengths greater than other wavelengths in the visible light spectrum such that the natural color shift of the optical polymer is counterbalanced or neutralized. That is, an additive that absorbs more yellow light than blue light can be selected such that white light transmitted through the composition of the present invention is white when entering the inventive composition and remains white when leaving the composition of the present invention. Due to the counterbalance effect of the additive, the composition of the present invention exhibits uniform light transmission throughout the visible light spectrum such that the natural color shift of the optical polymer is no longer perceived by the human eye.

The composition contains a suitable concentration and is differentially absorbed based on the total weight of the composition. An additive of light at a desired wavelength in the visible light spectrum or in a desired wavelength range. In a particular embodiment, the optical polymer of the composition is curable and exhibits high transmission throughout the visible spectrum (>90% at a sample thickness of 3 mm). In certain embodiments, the composition includes more than one suitable additive.

In one embodiment, the composition comprises an optical polymer such as poly(methyl methacrylate) (PMMA), polycarbonate (PC), cyclic olefin copolymer (COC), cyclic olefin polymer (COP). , polyfluorene, polyoxyl polymer or optical polyester. In an alternate embodiment, the composition includes any suitable optical polymer or combination of optical polymers. In a particular embodiment, the optical polymer is derived from an organooxane composition comprising a polymer or polymer combination having component (A) (an organomethoxyalkyl compound) . The component (A) may include a diorganopolyoxyalkylene oxide, an organic polyoxyalkylene oxide, an organooxyalkylene copolymer, an organic polyoxyalkylene resin, an organic oligomeric alkane, or any two or more of the above. combination.

The organooxane composition may further comprise component (B), a crosslinking agent. In one embodiment, component (B) is a combination comprising, but not limited to, an organohydrogen oligosiloxane, an organohydrogenpolyoxyalkylene, a polyorganohydrohalosiloxane, or a combination of any two or more of the foregoing. Crosslinker.

The organooxane composition may further comprise component (C), a catalyst for promoting the reaction of component (A) with component (B). In one embodiment, component (C) is a catalyst added in an amount sufficient to promote solidification of the composition. Component (C) may comprise a hydrosilylation catalyst which is well known in the art and is commercially available. Suitable rhodium hydrogenation catalysts include, but are not limited to, a platinum group metal, an organometallic compound of the platinum group metal, and any combination of any two or more of the foregoing. The platinum group metal includes, and the organometallic compound of the platinum group metal contains any one or more of platinum, rhodium, ruthenium, palladium, iridium, and iridium.

In one embodiment, the composition includes suitable additives, such as pigments, dyes, or optically active agents that differentially absorb light in the desired wavelength range in the visible light spectrum. In a particular embodiment, the additive absorbs light having a wavelength of from 480 nanometers (mm) to 700 nm, or more specifically from 500 nm to 600 nm, or even more specifically from 500 nm to 560 nm, while absorbing relative at other wavelengths in the visible light spectrum. Less light. Suitable pigments, dyes or optically active agents include, but are not limited to, blue pigments and blue dyes capable of absorbing light having a wavelength of from 500 nm to 600 nm. In a particular embodiment, the additive is sodium aluminosilicate. In an alternative embodiment, the additive is a material having the following experimental formula: C ₄₅ H ₄₄ N ₃ NaO ₇ S ₂ .

Additionally, in one embodiment, the additive has a concentration of from 0.2 part (ppm) to 2000 ppm, or more specifically from 1.2 ppm to 80 ppm, or even more specifically from 1.2 ppm to 20 ppm per million parts, based on the total weight of the composition. .

The composition may further comprise one or more additional ingredients. The additional ingredient or combination of ingredients may include, for example, an inhibitor (eg, inhibiting curing of the composition), a release agent, a filler, an adhesion promoter, a heat stabilizer, a flame retardant, a reactive diluent, an oxidation inhibitor, Or a combination of two or more of the above.

In one embodiment, the method of the invention for forming the composition comprises mixing a solution comprising the optical polymer with an additive that will differentially absorb light in the wavelength range of the visible light spectrum to form the composition. In one embodiment, the mixing step comprises adding an additive sufficient to ultimately give an amount of the composition of the invention having an additive concentration of from 0.2 parts per million to 2,000 parts by weight based on the total weight of the composition. The solution is mixed. In a particular embodiment, the mixing step includes mixing the solution with an additive that will differentially absorb light having a wavelength of from 500 nanometers to 600 nanometers.

The composition can then be cured using a suitable curing technique or method known to those of ordinary skill in the art to form a cured composition. In one embodiment, the composition is heated to cure the composition to form a cured product. The heating step can further include, for example, injection molding, transfer molding, casting, extrusion, overmolding, compression molding, or cavity molding to produce a molded, cast, or extruded article.

The optical device assembly can be produced using a composition as described herein by including a method of forming the composition and curing the composition to form a cured product, for example, for an optical device. The composition can be formed by injection molding, transfer molding, casting, extrusion, overmolding, compression molding, or cavity molding to produce molded, cast, or extruded articles. The method of forming the composition will depend on various factors including the size and/or shape of the optical device produced and the composition selected.

In one embodiment, the cured composition can be used in optical device applications to equally transmit light throughout the spectrum. The optical device can be, for example, a charge coupled device, a light emitting diode, a light guide, an optical camera, an optical coupler, or a waveguide. In another embodiment, the cured composition can be used in an optical device to promote uniform illumination of the surface from which the optical device draws light.

For example, FIG. 1 shows an optical device 100 that includes a light engine 102 and a stem portion 104 having a plurality of pick-up elements (not shown) formed on and/or within the stem portion 104. As shown in FIG. 1, light generally propagates through the stem 104 in the direction of travel indicated by directional arrow 106, and as the light propagates through the stem 104, a portion of the light is extracted from the stem 104 and exits through the picking member. Rod 104. A portion of the light is internally reflected as it travels through the stem 104 and exits the stem 104 at the end 108.

Figure 2 shows the lighting test of the optical device 200 of the present invention (in short, optical The optical device includes a light emitting diode (LED) engine 202 and a stem 204. During the test, the LED engine 202 sends a cool white light of 5145K CCT (Kjeldahl correlated color temperature) through the stem 204. As shown in FIG. 2, light extracted from the stem 204 at or near the first end 206 of the stem 204 near the LED engine 202 appears to be cool white, and at the opposite end 208 of the stem 204. The light exiting the stem 204 or nearby is yellow and warmer, thus having a significantly increased color shift.

In contrast, FIG. 3 shows a lighting test of the optical device 300 of the present invention having a stem portion 304 formed of a cured composition, the cured composition comprising an optical polymer and an additive having a composition based thereon The appropriate concentration of total weight will differentially absorb light in the wavelength or range of wavelengths in the visible light spectrum, as described herein. The LED engine 302 provides a cool white light of 5145K CCT that propagates through the stem 304 formed by the cured composition of the present example. As shown in FIG. 3, the light extracted from the stem portion 304 at or near the first end 306 of the stem portion 304 near the LED engine 302 appears to be cool white. The light exiting the stem 304 at or near the opposite end 308 of the stem 304 is still cool white, indicating little or no color shift change in color shift.

To quantify the color separation as shown in FIG. 2 and the relative lack of color separation as shown in FIG. 3, a photometric test is performed in the integrating sphere apparatus 400, as shown in FIG. The LED engine 402 at the first end of the stem 404 sends light through the stem 404 such that the light exits the stem 404 at the opposite end 406 and propagates into the integrating sphere 408.

Some embodiments include one or more of the following numbered aspects.

Aspect 1. A composition configured to equally transmit light throughout the spectrum, the composition comprising: an optical polymer; and an additive that differentially absorbs light in the wavelength range of the visible light spectrum such that the composition Light that uniformly transmits the entire visible spectrum.

Aspect 2. The composition of Aspect 1, wherein the polymer is selected from the group consisting of poly(methyl methacrylate) (PMMA), polycarbonate (PC), cyclic olefin copolymer (COC), cyclic olefin polymerization. (COP), polyfluorene, polyoxyl polymer and optical polyester.

Aspect 3. The composition of Aspect 1, wherein the additive is selected from the group consisting of pigments, dyes, and optically active agents.

Aspect 4. The composition of Aspect 1, wherein the additive is sodium aluminosilicate.

Aspect 5. The composition of Aspect 1, wherein the additive is sodium aluminosilicate having the following experimental formula: C ₄₅ H ₄₄ N ₃ NaO ₇ S ₂ .

Aspect 6. The composition of Aspect 1, wherein the additive (eg, the pigment, dye, or optically active agent of Aspect 3) absorbs light having a wavelength of from 500 nm to 600 nm while absorbing relatively little Light at other wavelengths in the visible light spectrum.

Aspect 7. The composition of Aspect 1, wherein the additive has a concentration of from 0.2 parts per million to 2,000 parts per million based on the total weight of the composition.

Aspect 8. The composition of Aspect 1, wherein the additive has a concentration of from 1.2 parts per million to 80 parts per million based on the total weight of the composition.

Aspect 9. The composition of aspect 1, further comprising selected from the group consisting of Additional ingredients of the group consisting of: inhibitors, mold release agents, fillers, adhesion promoters, heat stabilizers, flame retardants, reactive diluents, oxidation inhibitors, and combinations of any two or more of the foregoing.

Aspect 10. A composition configured to equally transmit light throughout the spectrum, the composition comprising: an optical polymer; and an additive that differentially absorbs light in the wavelength range of the visible light spectrum such that the composition The light is uniformly transmitted through the entire visible light spectrum, and the additive has a concentration of from 0.2 parts per million to 2,000 parts per million based on the total weight of the composition.

Aspect 11. A cured product formed by curing a composition of any one of Aspects 1 to 10.

Aspect 12. A use of a cured product such as Aspect 11 in optical device applications for equally transmitting light throughout the spectrum.

Aspect 13. An optical device comprising a cured product as in Aspect 11.

Aspect 14. An optical device according to aspect 13, which is selected from the group consisting of a charge coupled device, a light emitting diode, a light guide, an optical camera, an optical coupler, and a waveguide.

Aspect 15. A use of a cured product of Aspect 11 in an optical device for promoting uniform illumination of the surface of the optical device for capturing light.

Aspect 16. A method for forming a composition configured to uniformly transmit light throughout a spectrum, the method comprising: dissolving a solution comprising an optical polymer with light that is differentially absorbed in a wavelength range of the spectrum The additives are mixed to form the composition, wherein the additive differentially absorbs light in such a manner that the composition uniformly transmits light throughout the visible spectrum.

Aspect 17. The method of aspect 16, wherein the mixing step comprises mixing the additive with the solution, the additive having a concentration of from 0.2 parts per million to 2,000 parts per million based on the total weight of the composition.

Aspect 18. The method of Aspect 16, wherein the additive absorbs light having a wavelength of from 500 nm to 600 nm while absorbing relatively less light at other wavelengths in the visible light spectrum.

Aspect 19. The method of aspect 16, further comprising heating the composition to form the cured product.

The method of claim 19, wherein the heating step further comprises one of injection molding, transfer molding, casting, extrusion, overmolding, compression molding, and cavity molding, and the cured product is Molded, cast, or extruded objects.

The following examples are intended to illustrate certain embodiments of the invention, and are not to be construed as limiting the scope of the disclosure.

The photometric test was performed using the rod portion 204 not according to the present invention. Table 1 below provides a summary of the photometric test results.

As shown in Table 1, the light extracted from the stem 204 has a much lower CCT (3419K) and appears yellower than the correlated color temperature (CCT) (5145K) of the initial light from the LED engine 204.

Figure 5 provides a comparison of the spectral power distribution of an optical device other than the present invention, which is not The optical device of the invention comprises a light emitting diode (LED) light source and a non-inventive polyoxynitride rod portion made of an additive-free polyoxyxene material 1002. Looking at the spectral power distribution results of FIG. 5, when compared to the initial light from the LED engine 202 (FIG. 2) at or near the first end 206 (FIG. 2) (the line labeled "LED" in FIG. 5), The light exiting or extracting from the non-inventive stem 204 (Fig. 2) at the opposite second end 208 (Fig. 2) has a significant decrease in the blue spectrum, which is labeled "1002" in Fig. 5. The line is highlighted by arrow 502, thus enhancing the yellow-green spectrum, which is highlighted in Figure 5 by arrow 504. According to the color (HUE) theory, if the blue wavelength light is reduced in the shank, the shank will look yellower.

Comparative example

A sample of the additive-free polyoxonium material having a length of 50 mm (mm), a width of 50 mm, and a thickness of 3.85 mm was prepared to measure the transmittance values of all wavelengths in the spectrum as shown in FIG. The sample has a transmittance value of 0.9916 at a wavelength of 450 nanometers (nm) and a sample transmittance of 0.9958 at a wavelength of 550 nm. Therefore, the difference between the transmittance value at a wavelength of 450 nm and the transmittance value at a wavelength of 550 nm is 0.4%. In one embodiment, the additive-free polyoxyxene material sample is Example 1 of the present invention listed later in Table 3 along with Comparative Examples 1 and 2. Comparative Example 3 is shown in Table 2 below. Comparative Example 3 shows a cured product having a combination of properties prepared using a combination of a vinyl content in a polyoxyxene resin and a polymer having two different viscosities (a lower viscosity polymer and a higher viscosity polymer).

Other polyoxyxide material samples may include the following non-limiting examples shown in Table 3 below.

Figure 7 shows the transmission values for all wavelengths of the additive-free polyfluorinated material of length 300 mm in the spectrum. The equivalent is based on the test data and extinction coefficient of a sample of length 50 mm and is calculated using the following equation: T _d = e ^{- kd} , Eq. (1) where T _d is the transmittance value of the sample of length d , k is extinction Coefficient, and e is the natural logarithm.

As shown in Fig. 7, the transmittance value of the sample at a wavelength of 450 nm was 0.5163, and the transmittance of the sample at a wavelength of 550 nm was 0.7215. Therefore, the difference between the transmittance value at a wavelength of 450 nm and the transmittance value at a wavelength of 550 nm is 28%.

Figure 8 shows the transmittance values for all wavelengths in the spectrum of the additive-free polyoxyn material of length 914 mm. As shown in FIG. 8, when the length of the sample was declared to be 914 mm (about 3 feet), the transmittance value at the wavelength 450 was 0.1334, and the transmittance value at the wavelength 550 nm was 0.3700. Therefore, the difference between the transmittance value at a wavelength of 450 nm and the transmittance value at a wavelength of 550 nm is increased to 64%.

This color shift is due to the change in transmittance of light through the polyfluorene-free material without additives, as shown in the graphs of the absorption or light transmission of materials of different thicknesses in Figures 6 to 8 relative to the wavelength of light of the entire visible spectrum. Shown. The example compositions of the present invention as described herein and the cured products made from the inventive compositions of the present invention provide uniform light transmission throughout the spectrum. With equal light transmission across the spectrum, the light transmission curve across the spectrum will show no slope. In one embodiment, the inventive composition of the invention includes at least one of the green-yellow spectra (500 nm) Up to 600 nm) additives that differentially absorb light while maintaining high light transmission in the blue spectrum (430 nm to 480 nm).

A sample of the inventive composition of length 50 mm, width 50 mm, and thickness 3.85 mm, including the above Example 3 and the additives described herein, was made to measure the transmittance values for all wavelengths in the spectrum. Figure 9 provides a polyfluorene-containing oxygen sample 902 containing no additives (902 is the reference number in Figure 9, and without reference to the drawings, the additive-free polyoxyxene material may be referred to herein as the composition number "1002". A transmittance value between the transmittance value and the transmittance value of the inventive example composition sample 904 of the present disclosure.

The photometric test was carried out using a rod portion formed by curing a rod portion formed of the example composition of the present invention and an additive-free polyanthracene material (Example 3 above). Table 4 below provides a summary of the comparison results of the photometric test.

Fig. 10 shows an LED lamp ("LED" in the legend of Fig. 10) indicated by line 1000, and a stem portion formed of a polyxonium-containing material containing no additive by line 1002 ("1002" in the legend of Fig. 10) And comparing the spectral power distribution between the rod portions ("Inventive Examples" in the legend of Fig. 10) formed by curing the inventive composition of the present invention by line 1004. In Figure 10, the Y-axis is the radiated power (P). For example, if the light is at a wavelength of 450 nm The radiant power divided by the radiant power of light at a wavelength of 550 nm is usually expressed in Aval or "α" (ie α = P450 / P550, where the radiant power of light at a wavelength of 450 nm / the radiant power of light at a wavelength of 550 nm), and if the light The radiant power at a wavelength of 450 nm divided by the radiant power of light at a wavelength of 650 nm is usually expressed in beta or "β" (ie, β = P450 / P650, where the radiant power of light at a wavelength of 450 nm / the radiant power of light at a wavelength of 650 nm) The desired range of a, b values defining the flatness of the transmittance of all wavelengths can be determined as described above. Therefore, the desired range is 85% < α - rod / α - LED < 115%, and 70% < β - rod / β - LED < 130%.

Figure 11 shows the transmittance values of the inventive compositions of the present invention comprising sodium aluminosilicate as an additive.

As indicated above, the inventive compositions of the present disclosure reduce or eliminate the problem of color shift and uneven transmission of light through the entire visible spectrum. Regardless of the length of the light path through the material, the light traveling through the material made from the example composition of the present invention has no color shift or only minimal color shift.

The compositions of the present disclosure can be used to fabricate optical devices such as light guides and LED packages. Products prepared by curing these compositions can provide one or more benefits including, but not limited to, uniform transmission of visible light throughout the visible spectrum by curing visible light (eg, by uniform absorption of white light by curing the composition) Or equal transmittance, such that white light entering the cured composition transmits white light away from the cured composition and away from the cured composition), enhances light transmission, and increases LED package life. The method can form the shape of the composition and the cured product to have a geometric shape, and the geometry of the composition and the cured product can include, but is not limited to, a cylindrical shape, a rectangular shape, a simple convex lens, a patterned lens, a textured surface, a dome. Shape and lid. In optical device applications, the composition can be pre-manufactured by molding (extrusion or transfer) or casting procedures. or It is also possible to use the compositions described herein to perform a molding process on an optical device assembly on a rigid or flexible substrate, referred to as "overmolding" or "embedded molding." The surface of the cured product is non-tacky and has elastic plastic properties. This combination of properties makes the composition suitable for overmolding and other applications. The light guide described above can be used to transmit light from the light source to the viewing surface by internal reflection. Such applications include backlight units for displays, vehicle lighting, and message board applications.

Figure 1 shows a light source coupled to a stem having a scooping element and showing the direction of travel of light through the stem.

Figure 2 (not according to the invention) shows a lighting test of a non-inventive optical device made of a polyfluorene-containing material containing no additives.

Fig. 3 shows a lighting test of the optical device of the present invention made of the polyoxygenated material of the present invention.

Figure 4 shows a photometric test device including an integrating sphere.

Figure 5 (not according to the invention) shows a comparison of spectral power distribution results of a non-inventive optical device comprising a light-emitting diode (LED) light source and a non-inventive polyoxynitride rod made of an additive-free polyoxyxene material .

Figure 6 (not according to the invention) shows a thickness of 3.85 mm (mm) with light transmission through The transmittance value of the additive-free polyoxonium material.

Figure 7 (not according to the invention) shows the transmittance values of the additive-free polyoxyxene material having a thickness (length) of 300 mm through which light is transmitted.

Figure 8 (not according to the invention) shows the transmittance values of the additive-free polyoxyxene material having a thickness (length) of 914 mm through which light is transmitted.

Figure 9 shows a comparison of transmittance values between a non-inventive polyoxon rod portion made of an additive-free polyoxyxylene material and an exemplary rod portion of the present invention made of the inventive polyoxyxene material.

Figure 10 shows the spectral power distribution between an LED lamp sample, a non-inventive polyoxon rod portion made of an additive-free polyoxonium material, and an exemplary rod portion of the present invention made of the inventive example polyoxynitride material. Comparison.

Figure 11 shows the transmittance of the rod portion of the present invention made of the inventive polyoxyxene material having a composition comprising a sodium alumino sulfosilicate additive. value.

100‧‧‧Optical device

102‧‧‧Light engine

104‧‧‧ Rod

106‧‧‧ arrow

108‧‧‧End

Claims (11)

A composition configured to equally transmit light throughout the spectrum, the composition comprising: an optical polymer; and an additive that differentially absorbs light in the wavelength range of the visible light spectrum such that the composition uniformly transmits the entire visible light Spectral light. The composition of claim 1, wherein the polymer is selected from the group consisting of poly(methyl methacrylate) (PMMA), polycarbonate (PC), cyclic olefin copolymer (COC), cyclic olefin polymer (COP). , polyfluorene, polyoxyl polymer and optical polyester. The composition of claim 1, wherein the additive is selected from the group consisting of pigments, dyes, and optically active agents. The composition of claim 1, wherein the additive is sodium aluminosilicate, or wherein the additive is sodium aluminosilicate having the following experimental formula: C ₄₅ H ₄₄ N ₃ NaO ₇ S ₂ . The composition of any one of claims 1 to 4, wherein the additive absorbs light having a wavelength of from 500 nm to 600 nm while absorbing relatively less light at other wavelengths in the visible light spectrum. The composition of claim 1, wherein the additive has a concentration of from 0.2 parts per million to 2,000 parts per million based on the total weight of the composition. A composition configured to equally transmit light throughout the spectrum, the composition comprising: an optical polymer; and an additive that differentially absorbs light in the wavelength range of the visible light spectrum such that the composition uniformly transmits the entire visible light Spectral light having a concentration of from 0.2 parts per million to 2,000 parts per million based on the total weight of the composition. A cured product formed by curing the composition of claim 1. An optical device comprising the cured product of claim 8. A cured product formed by curing the composition of claim 5. An optical device comprising the cured product of claim 10.