KR20200145635A - Color changeable window structure - Google Patents

Abstract

The present invention relates to a window structure which includes: first glass; second glass including light sensitive substances; a light source module radiating light of a wavelength reacting with the light sensitive substances; and a diffraction optical element dispersing the light radiated from the light source module toward the second glass, wherein the light sensitive substances correspond to photochemical reversible reaction materials. The window structure can change a color of the glass without using liquid crystals.

Description

Window structure that can change color{COLOR CHANGEABLE WINDOW STRUCTURE}

The present disclosure relates to a window structure, and more particularly, to a window structure capable of adjusting visible light transmittance.

The color changeable window structure may adjust the visible light transmittance by adjusting the transparency and/or color of the glass. Such a window structure is also called smart glass or smart window, and conventionally, a polymer dispersed liquid crystal (PDLC) that modifies the orientation of polarization molecules, and electrochromic (EC) technology that transfers electric charges has been used. . However, in the case of using conventional polymer dispersed liquid crystals or electrochromic, electrodes and liquid crystals are required for light scattering or light absorption, thereby greatly increasing the manufacturing cost of color-changing glass, and furthermore, the degree of discoloration is different for each product, resulting in poor reproducibility. There is a problem.

On the other hand, window structures using thermochromic (TC, thermochromic) glass and heat-reflecting (Low-E) glass do not use an electrical or electronic system, so manufacturing cost can be reduced, but visible light transmittance is reduced or Another problem is that it is a passive form that cannot be adjusted.

An object of the present disclosure is to provide a window structure using a diffractive optical element without using a liquid crystal.

An object of the present disclosure is to provide a window structure that does not use a physical structure such as a blackout curtain or a barrier.

According to an embodiment of the present disclosure, the window structure includes a first glass, a second glass including a photosensitive material, a light source module emitting light having a wavelength to react with the photosensitive material, and the light emitted from the light source module. It may include a diffractive optical element dispersing toward the glass, and the photosensitive material may correspond to a photochemically reversible reaction material.

According to an embodiment of the present disclosure, the first glass may include a UV blocking film.

According to an embodiment of the present disclosure, the photosensitive material may include AgCl.

According to an embodiment of the present disclosure, the photosensitive material is 60 to 95 weight of a water-soluble or water-dispersible vinyl-based copolymer having a carboxyl group at the end of the main chain obtained by polymerization using the following components 1 to 3, based on 100% by weight of the photosensitive material. %;

Component 1: 2 to 15% by weight of a copolymerizable vinyl-based monomer having a carboxyl group as a substituent

Component 2: 50 to 85% by weight of a copolymerizable vinyl monomer other than component 1

Component 3: 0.01 to 5% by weight of a chain transfer agent having a carboxyl group

(b) 3 to 20% by weight of a low-molecular photosensitive agent having an average of 1 to 2 photosensitive groups per molecule; And (c) 0.1 to 0.5 moles of a tertiary amine as a neutralizing agent per 1 mole of the carboxyl group of the component (a).

According to an exemplary embodiment of the present disclosure, the height of the diffraction pattern of the diffractive optical element may change from the center of one surface of the diffractive optical element to the edge.

According to an embodiment of the present disclosure, the diffraction efficiency of visible light incident on the diffractive optical element may be 0.4 or more.

According to an exemplary embodiment of the present disclosure, a difference in first-order diffraction efficiency of blue light, green light, and red light among visible rays incident on the diffractive optical element may be 0.5 or less.

According to an exemplary embodiment of the present disclosure, when the incident angle of visible light incident on the diffractive optical element is 0 to 50 degrees, the diffraction efficiency of the first order light may be 0.4 or more.

When the window structure according to the embodiments of the present disclosure is used, the glass can be discolored without using a liquid crystal.

When the window structure according to the embodiments of the present disclosure is used, a physical structure such as a blackout curtain or a blocking film is used in a window structure in which ultraviolet rays (UV) included in sunlight are blocked and visible light transmits 90% or more. Without doing so, the transmittance of the visible wavelength can be adjusted.

When the window structure according to the embodiments of the present disclosure is used, the degree of discoloration between individual products is uniformed by using a photochemically reversible photosensitive material, thereby increasing the reproducibility of the window structure.

When the window structure according to the embodiments of the present disclosure is used, the total thickness of the window structure may be reduced by using a diffractive optical element.

When the window structure according to the embodiments of the present disclosure is used, since the multilayer glass technology is used while discoloring the glass, there is an effect of increasing heat insulation properties or energy saving effect.

When the photosensitive material according to the embodiments of the present disclosure is used, there is no difference between individual products in controlling visible light because it has high durability, and has heat resistance, so when used for fireproof glass, heat shielding or heat insulating function can be performed.

The effects of the present disclosure are not limited to the effects mentioned above, and other effects that are not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a view showing a window structure according to an embodiment of the present disclosure.
2 is a diagram illustrating a phenomenon in which light emitted from a light source module is diffracted while passing through a diffractive optical element according to an embodiment of the present disclosure.

Hereinafter, with reference to the accompanying drawings, specific details for implementing the present disclosure will be described in detail. However, in the following description, if there is a possibility that the subject matter of the present disclosure may be unnecessarily obscure, detailed descriptions of widely known functions or configurations will be omitted.

In this specification, expressions in the singular include plural expressions, unless the context clearly specifies that they are singular. In addition, plural expressions include expressions in the singular unless explicitly specified as plural in context.

Throughout the specification of the present application, when a certain part "includes" a certain component, it means that other components may be further included rather than excluding other components unless specifically stated to the contrary.

Throughout this specification, the description of “A and/or B” means “A, or B, or A and B”.

Materials described throughout this specification should be construed as including monomers and/or (co)polymers of the material.

In the accompanying drawings, the same or corresponding components may be given the same reference numerals. In addition, in the description of the following embodiments, overlapping descriptions of the same or corresponding components may be omitted. Even if description of a component is omitted, it should not be construed as not being included in a specific embodiment.

Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art may easily implement the present application. However, the present application may be implemented in various different forms and is not limited to the embodiments described herein. In addition, in the drawings, parts not related to the description are omitted in order to clearly describe the present application, and similar reference numerals are attached to similar parts throughout the specification.

1 is a view showing a window structure 100 according to an embodiment of the present disclosure.

According to an embodiment of the present disclosure, the window structure 100 includes a first glass 112, a second glass 114 coated with a photosensitive material 130, a first glass 112 and a second glass 114 A light source module 140 disposed between and emitting light having a wavelength that reacts with the photosensitive material 130, and a diffractive optical element 150 dispersing light emitted from the light source module 140 toward the second glass 114 ) Can be included. In FIG. 1, only two glasses 110 are illustrated as the first glass 112 and the second glass 114, but the present invention is not limited thereto, and additionally, glass may be further included.

According to an embodiment of the present disclosure, the first glass 112 may include an ultraviolet (UV) blocking film 120 on an inner surface thereof. The first glass 112 may block ultraviolet rays included in external sunlight passing through the first glass 112 by using the ultraviolet blocking film 120. In addition, the degree of discoloration of the glass by the photosensitive material 130 is arbitrarily changed according to the external environment by preventing light (e.g., ultraviolet rays) emitted from outside other than the light source module 140 from activating the photosensitive material 130. Can be prevented.

According to an embodiment of the present disclosure, the photosensitive material 130 may be applied to the inner surface of the second glass 114. The photosensitive material 130 may correspond to a photochemically reversible reaction material. The photosensitive material 130 undergoes a reaction that is activated by the light emitted from the light source module 140 and has a color. If there is no light emitted from the light source module 140, the reaction is deactivated again, and there is no color. I can lose. Alternatively, the photosensitive material 130 undergoes a reaction that is deactivated by the light emitted from the light source module 140 and has a color, and is activated when there is no light emitted from the light source module 140. Can disappear. Alternatively, the photosensitive material 130 undergoes a reaction of being activated or deactivated by light included in the first wavelength region radiated from the light source module 140 to have a first color, and then radiated from the light source module 140. A reaction that is deactivated or activated by light included in the 2-wavelength region may proceed to have a second color. Here, the first wavelength region and the second wavelength region may correspond to different regions, and the first color and the second color may have at least one of different colors, brightness, and saturation.

In FIG. 1, it is shown that the UV blocking film 120 is formed on the inner surface of the first glass 112 and the photosensitive material 130 is formed on the inner surface of the second glass 114, but the present disclosure It is not limited, and may be formed on the outer surface of each glass.

In the case of a window structure using a conventional PDLC method, there is a problem that the transmittance of visible light is deteriorated when the electrode is not used. The window structure 100 according to an embodiment of the present disclosure includes a light source module 140 between the first glass 112 including the UV blocking film 120 and the second glass 114 to which the photosensitive material 130 is applied. Since the structure in which is arranged is used, discoloration due to the external environment is minimized, so that when the photosensitive material 130 does not discolor, visible light can be transmitted by 80% or more, and even 90% or more. Furthermore, since the multilayer glass technology is used, there is an effect that can increase heat insulation or energy saving effect.

According to an embodiment of the present disclosure, a light source module 140 and a diffractive optical element 150 may be disposed under the window structure 100. The light source module 140 may emit light of a specific wavelength band in order to discolor the photosensitive material 130 applied to the inner surface of the second glass 114. At this time, discoloring the photosensitive material 130 includes both a coloring reaction of darkening the photosensitive material 130 and a color fading reaction of transparently discoloring the photosensitive material 130. The light emitted from the light source module 140 may pass through the diffractive optical element 150 and reach the inner side of the second glass 114 to which the photosensitive material 130 is applied.

The diffractive optical element 150 may be positioned above the light source module 140 and may disperse light emitted from the light source module 140 toward the inner side of the second glass 114. The wavefront of the light is modulated by the diffractive optical element 150, and the light with the modulated wavefront may uniformly reach the entire area of the inner surface of the second glass 114.

As long as the light emitted from the light source module 140 can be diffracted by the diffractive optical element 150 to reach the photosensitive material 130, the positions of the light source module 140 and the diffractive optical element 150 are variously changed. Can be.

Photosensitive material

The photosensitive material 130 according to the present disclosure is a photochemically reversible reaction material, and may correspond to a photosensitive paint or a color change paint.

According to one embodiment of the disclosure, the photosensitive material 130 can include a determination of the cation and anion combination, and specifically is a cation (Ag ⁺⁾ and a halogen anion (for example, F ^-, Cl ^-, Br ^- , I ^- etc.) may be a combined salt. As a representative example, the photosensitive material 130 may include a silver halide compound such as AgCl.

According to another embodiment of the present disclosure, the photosensitive material 130 is based on 100% by weight of the photosensitive material 130, (a) 60 to 95% by weight of a water-soluble or water-dispersible vinyl-based copolymer having a carboxyl group at the end of the main chain, (b ) 3 to 20% by weight of a low-molecular photosensitizer having an average of 1 to 2 photosensitive groups per molecule, and (c) 0.1 to 0.5 moles of a tertiary amine as a neutralizing agent per 1 mole of the carboxyl group of the component (a) .

(a) The substance can be obtained by polymerization using the following components 1 to 3, based on 100% by weight of the (a) substance.

Component 1: 2 to 15% by weight of a copolymerizable vinyl-based monomer having a carboxyl group as a substituent

Component 2: 50 to 85% by weight of a copolymerizable vinyl monomer other than component 1

Component 3: 0.01 to 5% by weight of a chain transfer agent having a carboxyl group

According to the exemplary embodiments of the present disclosure, the photosensitive material 130 is a photochemically reversible reaction material, and a coloring reaction, which is a positive reaction in response to light, proceeds to discolor to darken, further removing exposure to light or having a relatively long wavelength. When exposed to light, the color fading reaction proceeds as the reverse reaction of the color reaction. In this way, the photosensitive material 130 applied to the glass responds to the presence or absence of light or the wavelength, and decreases the visible light transmittance of the glass by a coloring reaction (positive reaction), or the visible light transmittance of the glass through a fading reaction (reverse reaction). The light transmittance can be increased.

According to an embodiment of the present disclosure, the photosensitive material 130 may be applied to glass in the form of a powder or a film.

Since the photosensitive material 130 according to an embodiment of the present disclosure has high durability, there is no difference between individual products in controlling visible light, and has heat resistance, so when used for fireproof glass, it may perform heat shielding or heat insulation function.

Light source module

According to an embodiment of the present disclosure, the light source module 140 may emit light of a specific wavelength band that reacts, for example, changes color or activates (or deactivates) the photosensitive material 130 applied to the glass. The light source module 140 according to an embodiment may correspond to an LED module. Here, the LED module may include at least one of an ultraviolet ray (UV) LED, an infrared ray (IR) LED, and a visible light LED. According to an embodiment, the LED module may change the wavelength of emitted light.

Specifically, during the coloring reaction or the activation reaction, the UV LED darkens the glass to which the photosensitive material 130 is applied, and during the fade reaction or inactivation reaction, the colored glass may be faded again using the IR LED. As an example, when the photosensitive material 130 including AgCl applied to the first glass 112 is exposed to UV emitted from the light source module 140, a coloring reaction proceeds to proceed to AgCl included in the photosensitive material 130 Silver can be decomposed into Ag ions and Cl ions. When UV is removed, a fading reaction proceeds, and Ag and Cl ions can form AgCl again.

Since AgCl absorbs light with short wavelength light, that is, silver colloids generated by irradiation of ultraviolet rays emitted from UV LEDs, a coloring reaction proceeds and glass may be colored. Furthermore, in a dark place where exposure to ultraviolet rays has been removed, or by irradiation of infrared rays emitted from the IR LED, the coloration reaction, which is the reverse reaction of the coloring reaction, proceeds, and the silver colloid absorbing light is converted into transparent AgCl particles again, and the colored glass is also It can fade again.

Similar to AgCl, the photosensitive material 130 including silver halide (eg, AgF, AgBr, AgI, etc.) is subjected to a coloring reaction by ultraviolet rays emitted from the UV LED to reduce the transmittance of visible rays, and The exposure may be removed or a fading reaction proceeds by infrared rays emitted from the IR LED, thereby increasing the transmittance of visible light.

According to an embodiment of the present disclosure, light for the color reaction or activation reaction of the photosensitive material 130 may correspond to an electromagnetic wave having a wavelength of 280 nm to 350 nm and/or 350 to 450 nm. Light for the fading reaction of the photosensitive material 130 may correspond to an electromagnetic wave of 650 to 900 nm.

Similar to the UV LED and IR LED, the visible light LED can emit blue light, green light, and red light to discolor the photosensitive material 130 applied to the glass. In this case, the wavelength of blue light among visible light is 350 to 450 nm, the wavelength of green light is 450 to 600 nm, and the wavelength of red light may correspond to 600 to 750 nm, but the present disclosure is not limited thereto.

Diffraction optical element

According to an embodiment of the present disclosure, the diffractive optical element 150 (DOE, diffractive optical element) may correspond to an optical element in which a plurality of diffraction patterns are periodically formed on at least one surface. The diffraction pattern of the diffraction optical element 150 is a surface uneven structure, and specifically, may be at least one of a streamlined sawtooth, multiple steps, steps, and sawtooth, but is not limited thereto, and all diffraction patterns capable of diffracting incident light Includes the shape of. Furthermore, the diffractive optical element 150 may include a plurality of diffraction patterns having different pattern shapes rather than a single pattern shape. In addition, the period in which the diffraction pattern is formed may be changed.

The uneven structure of the surface of the diffractive optical element 150 may be generated by various methods such as a hot stamping method and a laser processing method. The diffraction pattern formed on the diffraction optical element 150 modulates the phase and amplitude of light incident on the surface structure to convert the wavefront of the incident light wave or diffract the light emitted from the light source module 140 (eg, LED module). I can. At this time, the incident light passing through the diffraction pattern of the diffraction optical element 150 is divided into 0-order light (D0), first-order light (D1), -1 order light, etc., and the second glass 114 to which the photosensitive material 130 is applied It can reach the entire surface of

The height and diffraction efficiency of the diffraction pattern of the diffractive optical element 150 according to the present disclosure will be described in more detail in FIG. 2.

Compared with the window structure using the conventional PDLC method, according to an embodiment of the present disclosure, since the transmittance of visible light is adjusted using the diffractive optical element 150, the LED module, and the photosensitive material 130, compared with the PDLC method. There is an advantage in that the manufacturing cost can be remarkably lowered because expensive liquid crystal glass is not required.

2 is a diagram illustrating a phenomenon in which light emitted from the light source module 140 is diffracted while passing through the diffractive optical element 150 according to an exemplary embodiment of the present disclosure. The diffractive optical element 150 may diffract the incident light emitted from the light source module 140 to uniformly distribute the light over the entire inner surface of the second glass 114 on which the photosensitive material 130 is applied. Accordingly, the degree of coloring or fading of the second glass 114 can be made uniform over the entire surface. Alternatively, only a part of the entire inner surface of the second glass 114 may be colored or faded by adjusting the degree of light dispersion. For example, by adjusting the degree of light dispersion so as to form a pattern or figure on the inner surface of the second glass 114, only a part of the entire inner surface of the second glass 114 may be colored or faded.

The diffractive optical element 150 includes at least one diffraction pattern having a surface uneven structure, in which case the height of the diffraction pattern is defined as a distance between the minimum pattern point 240 and the maximum pattern point 250 of the surface uneven structure. . The height of the diffraction pattern may change from the center of one surface of the diffraction optical element 150 to the edge. In one embodiment, the height of the diffraction pattern may be designed to change continuously from the center of one surface of the diffraction optical element 150 to the edge, and more specifically, the height of the diffraction pattern is at the center of one surface of the diffraction optical element 150 The height of the diffraction pattern may be formed to decrease toward the edge, or conversely, the height of the diffraction pattern may be formed to increase continuously from the center of one surface of the diffractive optical element 150 toward the edge. In addition, the height of the diffraction pattern may change discontinuously.

Further, the diffraction pattern may be designed through programming of a target diffraction angle calculation, a phase function of the diffraction pattern, or a transmission function modeling. As a representative example, the diffraction pattern of the diffraction optical element 150 may be designed through modeling an optimization function to have a target diffraction angle and diffraction efficiency through an iterative fuorier transform algorithm (IFTA). The design method of the diffraction pattern is described in the document "Design of diffractive optical elements for multiple wavelengths", APPLIED OPTICS/Vol.37, Issue 26, pp.6174-6177, 1998), etc., and the contents of the document are described in this specification. It shall be included.

The diffraction efficiency of the diffractive optical element 150 was calculated by Equation 1 below.

[Equation 1]

Diffraction efficiency = (Intensity of diffracted and transmitted read light)/(Intensity of diffracted and transmitted read light + Intensity of read light transmitted without diffraction) × 100

The intensity of the diffracted and transmitted read light and the intensity of the non-diffracted read light were calculated from the measured values of the amount of diffracted and transmitted read light and the amount of non-diffracted read light, respectively.

The diffractive optical element 150 according to an embodiment of the present disclosure may be designed to adjust diffraction efficiency according to a diffraction pattern. In general, it is measured that the diffraction efficiency of light of a long wavelength is high at a high height of the diffraction pattern, and a high diffraction efficiency of light of a short wavelength is measured where the height of the diffraction pattern is low. That is, in FIG. 2, the diffraction efficiency of the long wavelength light L1 is high in the first diffraction pattern 210 having a high diffraction pattern height, and the short wavelength light L3 in the third diffraction pattern 230 having a low diffraction pattern height. ) Has a high diffraction efficiency, so that even if the wavelength of incident light is different, the overall diffraction efficiency can be similarly adjusted by the diffraction optical element 150 including a diffraction pattern having a different height of the diffraction pattern. Accordingly, in an exemplary embodiment, the diffraction efficiency of visible light incident on the diffractive optical element 150 may be designed to have a value of 0.4 or more.

In another embodiment, a difference in first-order diffraction efficiency of blue light, green light, and red light among visible rays incident on the diffractive optical element 150 may be designed to have a value of 0.5 or less. Blue light having a relatively long wavelength may have high diffraction efficiency in the first diffraction pattern 210 having a high diffraction pattern height. Red light having a relatively short wavelength may have high diffraction efficiency in the third diffraction pattern 230 having a low diffraction pattern height. In addition, green light having a wavelength longer than red light and shorter than blue light may have high diffraction efficiency in the second diffraction pattern 220. Accordingly, the first order light of the diffracted blue light, green light, and red light passing through the diffractive optical element 150 may all have high diffraction efficiency, and a difference between the values may be 0.5 or less.

As the height of the diffraction pattern of the diffractive optical element 150 changes continuously or discontinuously from the center of one surface of the diffractive optical element 150 to the edge, regardless of the incident angle of the light passing through the diffractive optical element 150 It can have a high diffraction efficiency. In an embodiment, when the incident angle of visible light incident on the diffractive optical element 150 is 0 to 50 degrees, the diffraction efficiency of the first order light may be designed to have a value of 0.4 or more. In FIG. 2, when light L1 having an incidence angle of 0 degrees and incident on the first diffraction pattern 210 is visible light, light L1 is divided into zero-order light (D0), first-order light (D1), and the like, of which the first-order light (D1) ) May have a value of 0.4 or more.

The window structure according to the present disclosure uses the diffractive optical element 150 to react to the visible light of the glass including the photosensitive material 130 through a color change reaction of coloring or fading the photosensitive material 130 without using a liquid crystal. The transmittance can be adjusted. In this way, the window structure according to the present disclosure can adjust the transmittance of the glass to the visible light due to the interaction between the light source module 140, the diffractive optical element 150, and the color change glass, Also applicable.

The previous description of the present disclosure is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications of the present disclosure will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to various modifications without departing from the spirit or scope of the present disclosure. Accordingly, this disclosure is not intended to be limited to the examples described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

In the present specification, the present disclosure has been described with reference to some embodiments, but it should be understood that various modifications and changes may be made without departing from the scope of the present disclosure as can be understood by those skilled in the art to which the present disclosure belongs. something to do. In addition, such modifications and changes should be considered to fall within the scope of the claims appended to this specification.

110: glass
112: first glass
114: second glass
120: UV blocking film
130: photosensitive material
140: light source module
150: diffractive optical element
210, 220, 230: diffraction pattern
240: pattern minimum point
250: pattern maximum point

Claims (10)

As a window structure,
First glass;
A second glass containing a photosensitive material;
A light source module emitting light of a wavelength that reacts the photosensitive material; And
Including a diffractive optical element for dispersing the light radiated from the light source module toward the second glass,
The photosensitive material corresponds to a photochemical reversible reaction material,
Window structure.
The method of claim 1,
The first glass comprises a UV blocking film, a window structure.
The method of claim 1,
The photosensitive material comprises AgCl, a window structure.
The method of claim 1,
The photosensitive material is compared to 100% by weight of the photosensitive material
(a) 60 to 95% by weight of a water-soluble or water-dispersible vinyl copolymer having a carboxyl group at the end of the main chain;
(b) 3 to 20% by weight of a low-molecular photosensitive agent having an average of 1 to 2 photosensitive groups per molecule; And
(c) A window structure containing 0.1 to 0.5 moles of a tertiary amine as a neutralizing agent with respect to 1 mole of the carboxyl group of the component (a).
The method of claim 1,
The height of the diffraction pattern of the diffractive optical element is changed from the center of one side of the diffractive optical element toward the edge.
The method of claim 1,
The window structure, wherein the diffraction efficiency of visible light incident on the diffractive optical element is 0.4 or more.
The method of claim 1,
A window structure in which a difference in first-order diffraction efficiency of blue light, green light, and red light among visible rays incident on the diffractive optical element is 0.5 or less.
The method of claim 1,
When the incident angle of visible light incident on the diffractive optical element is 0 to 50 degrees, the diffraction efficiency of the first order light is 0.4 or more, the window structure.
As a photosensitive material used in window structures capable of discoloration,
Compared to 100% by weight of the photosensitive material
(a) 60 to 95% by weight of a water-soluble or water-dispersible vinyl copolymer having a carboxyl group at the end of the main chain;
(b) 3 to 20% by weight of a low-molecular photosensitive agent having an average of 1 to 2 photosensitive groups per molecule; And
(c) A photosensitive material containing 0.1 to 0.5 moles of a tertiary amine as a neutralizing agent with respect to 1 mole of the carboxyl group of the component (a).
The method of claim 9,
The (a) material is obtained by polymerization using the following components 1 to 3, based on 100% by weight of the (a) material, a photosensitive material.
Component 1: 2 to 15% by weight of a copolymerizable vinyl-based monomer having a carboxyl group as a substituent
Component 2: 50 to 85% by weight of a copolymerizable vinyl monomer other than component 1
Component 3: 0.01 to 5% by weight of a chain transfer agent having a carboxyl group

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