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CN117624689B - High-wear-resistance fingerprint-proof antiglare film and preparation method thereof - Google Patents

High-wear-resistance fingerprint-proof antiglare film and preparation method thereof Download PDF

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CN117624689B
CN117624689B CN202311630280.XA CN202311630280A CN117624689B CN 117624689 B CN117624689 B CN 117624689B CN 202311630280 A CN202311630280 A CN 202311630280A CN 117624689 B CN117624689 B CN 117624689B
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fingerprint
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wear
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CN117624689A (en
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向一民
刘新
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Jiangsu Yilicom New Material Co ltd
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    • C09D175/00Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
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Abstract

The invention belongs to the technical field of antiglare films, and in particular relates to a high-wear-resistance fingerprint-proof antiglare film and a preparation method thereof, wherein the high-wear-resistance fingerprint-proof antiglare film comprises the following components: a plastic substrate and a high wear-resistant fingerprint-proof antiglare coating disposed thereon; the coating of the high wear-resistant fingerprint-resistant anti-dazzle coating comprises the following components in parts by mass: 10-70 parts of fluorine modified polyurethane acrylic ester; 0-35 parts of polyurethane acrylic resin; 0-45 parts of acrylic acid monomer; 0.5 to 1 part of leveling agent; 3-5 parts of photoinitiator; 60-120 parts of solvent; the fluorine modified polyurethane acrylic ester is cured on the surface of the high wear-resistant fingerprint-resistant anti-dazzle coating through low-energy semi-curing and secondary baking migration, and the fluorine-containing chain segment is stretched; through setting up primary baking-low energy semi-curing-secondary baking, make fluorine modified polyurethane acrylic ester volatilize to the surface along with the solvent and realize fluorine-containing chain segment stretching on the coating surface, finally realize that the anti-dazzle membrane that the transfer printing method prepared possesses fingerprint resistance and dirt resistance's effect.

Description

High-wear-resistance fingerprint-proof antiglare film and preparation method thereof
Technical Field
The invention belongs to the technical field of antiglare films, and particularly relates to a high-wear-resistance fingerprint-proof antiglare film and a preparation method thereof.
Background
Display ghosts can occur when screen displays of consumer electronic products, chalking-free electronic blackboards, outdoor advertisement display screens and the like are reflected by external light, so that display is unclear, and one of the methods is to obtain an anti-dazzle film by designing a concave-convex structure on the surface of an optical film of the screen to generate diffuse reflection so as to reduce linear reflection of light. The method for obtaining the antiglare film in the prior art comprises the following steps:
1. And adding extinction powder into the coating system, wherein the extinction powder is partially exposed on the surface in the coating solvent volatilization process and is cured to maintain the structure. Chinese patent CN114686078A discloses an anti-dazzle composition, an anti-dazzle film, a preparation method and application thereof, and the invention introduces silicon oxide particles with average particle diameter of 1-5um through a system, and enables silicon oxide to be more uniformly dispersed in an anti-dazzle layer through introducing a cellulose compound, thereby having the advantages of excellent anti-dazzle performance, interference fringe prevention, white turbidity prevention, surface flickering and the like. Chinese patent CN114806351a discloses an antiglare composition, antiglare film, and preparation method and application thereof. The photocuring system obtains an anti-dazzle layer with proper reflection and the ratio of external haze and internal haze in a specific range by introducing two composite particles of small particles with average particle diameter of 1-2um and large particles with average particle diameter of 3-5 and controlling the mass ratio of the small particles to the large particles, and has the advantages of interference fringe prevention, white turbidity, surface halo prevention and the like. Chinese patent CN114672057a discloses an antiglare film, a method for preparing the same and a display device, wherein an inorganic filler and antiglare functional particles are introduced into a photocuring system, wherein the antiglare functional particles comprise monodisperse small particles and monodisperse large particles, and the antiglare film has better antiglare property, high wear resistance, low flash point and high hardness. Chinese patent CN114479152A discloses a high-hardness anti-dazzle film, which has high anti-dazzle performance, high hardness and high wear resistance by introducing 5-20 parts by weight of inorganic nano particles and 0.1-2.5 parts by weight of anti-fingerprint auxiliary agent into a system. The technology is characterized in that powder is introduced into a coating system to form a two-phase system, and the two-phase system is a solid-liquid two-phase system, so that the compatibility problem caused by the difference of interface performance exists, the uneven appearance and poor storage stability caused by powder aggregation can be finally generated, in addition, the binding force between the powder and resin is poor, and the powder is easy to fall off when an anti-dazzle coating rubs, so that the wear resistance is poor.
2. And copying and transferring the template structure to the coated plastic substrate by adopting a transfer printing method. In the prior art, a photo-curing coating is coated on a plastic base film, and a texture structure release transfer template is covered to obtain an anti-dazzle film. However, the antiglare film obtained by the process has no fingerprint resistance, which affects the application.
Therefore, there is a need to solve the problem that the antiglare film prepared by the transfer method does not have an antiglare effect.
Disclosure of Invention
The invention provides a high-wear-resistance anti-fingerprint anti-dazzle film and a preparation method thereof, which are used for solving the problem that the anti-dazzle film prepared by a transfer printing method does not have an anti-fingerprint effect.
In order to solve the technical problems, the invention provides a high wear-resistant fingerprint-proof anti-dazzle film, which comprises the following components: a plastic substrate and a high wear-resistant fingerprint-proof antiglare coating disposed thereon; the coating of the high wear-resistant fingerprint-resistant anti-dazzle coating comprises the following components in parts by mass: 10-70 parts of fluorine modified polyurethane acrylic ester; 0-35 parts of polyurethane acrylic resin; 0-45 parts of acrylic acid monomer; 0.5to 1 part of leveling agent; 3-5 parts of photoinitiator; 60-120 parts of solvent; the fluorine modified polyurethane acrylic ester is cured on the surface of the high wear-resistant fingerprint-resistant anti-dazzle coating through low-energy semi-curing and secondary baking migration curing, and the fluorine-containing chain segment is stretched.
In still another aspect, the present invention further provides a method for preparing the anti-fingerprint anti-dazzle film with high wear resistance, which comprises the following steps: step S1, mixing and stirring according to parts by weight to prepare the coating with the high wear-resistant fingerprint-resistant anti-dazzle coating; s2, coating the coating of the high wear-resistant fingerprint-resistant anti-dazzle coating on the plastic substrate by adopting a precise coating method, wherein the thickness of the coating is 4-15 mu m, and baking the plastic substrate for 1-3 min at 70-100 ℃ in an oven to dry the solvent; s3, coating the structure texture transfer template, and performing low-energy semi-curing surface drying by using 80-150 mJ/cm 2 of LED395nm/LED365nm energy; and S4, stripping, rolling and removing the structural texture transfer template, baking for 0.5-1 min at 80-120 ℃ for the second time through a baking oven, and completely curing by using a high-pressure mercury lamp with the energy of 300-800 mJ/cm 2 to obtain the high-wear-resistance fingerprint-proof anti-dazzle film.
The high-wear-resistance fingerprint-proof anti-dazzle film and the preparation method thereof have the beneficial effects that through the arrangement of primary baking, low-energy semi-curing and secondary baking, fluorine modified polyurethane acrylate volatilizes to the surface along with a solvent and realizes stretching of fluorine-containing chain segments on the surface of a coating, so that the high-wear-resistance fingerprint-proof anti-dazzle coating has low surface energy, and finally, the anti-dazzle film prepared by a transfer printing method has fingerprint-proof and anti-fouling effects.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a high wear-resistant fingerprint-proof antiglare film, which comprises: a plastic substrate and a high wear-resistant fingerprint-proof antiglare coating disposed thereon; the coating of the high wear-resistant fingerprint-resistant anti-dazzle coating comprises the following components in parts by mass: 10-70 parts of fluorine modified polyurethane acrylic ester; 0-35 parts of polyurethane acrylic resin; 0-45 parts of acrylic acid monomer; 0.5 to 1 part of leveling agent; 3-5 parts of photoinitiator; 60-120 parts of solvent; the fluorine modified polyurethane acrylic ester is cured on the surface of the high wear-resistant fingerprint-resistant anti-dazzle coating through low-energy semi-curing and secondary baking migration curing, and the fluorine-containing chain segment is stretched.
In this embodiment, the plastic substrate is specifically any one of polyethylene terephthalate (PET), polycarbonate (PC), polyacrylate (PMMA), thermoplastic Polyurethane (TPU), and cellulose Triacetate (TAC).
In this embodiment, specifically, the reactive functionality of the fluorine modified urethane acrylate is greater than or equal to 6.
In this embodiment, specifically, the reactive functionality of the urethane acrylic resin is equal to or greater than 3.
In this embodiment, in particular, the fluorine-modified urethane acrylate and urethane acrylic resin with high functionality can effectively improve the hardness and abrasion resistance of the antiglare film.
In this embodiment, the acrylic monomer is specifically any one or a combination of more than one of pentaerythritol triacrylate, pentaerythritol tetraacrylate, pentaerythritol trimethacrylate, pentaerythritol tetramethacrylate, dipentaerythritol hexaacrylate, and trimethylolpropane triacrylate.
In this embodiment, specifically, the leveling agent is any one of a fluorine modified leveling agent and a silicon modified leveling agent.
In this embodiment, the photoinitiator is specifically any one or a combination of a cleavage type photoinitiator and a hydrogen abstraction type photoinitiator.
In this embodiment, the solvent is specifically any one or a combination of more of isopropanol, isobutanol, methyl ethyl ketone, methyl isobutyl ketone, ethyl acetate, butyl acetate, propylene glycol methyl ether, and propylene glycol methyl ether acetate.
In still another aspect, the present invention further provides a method for preparing the anti-fingerprint anti-dazzle film with high wear resistance, which comprises the following steps: step S1, mixing and stirring according to parts by weight to prepare the coating with the high wear-resistant fingerprint-resistant anti-dazzle coating; s2, coating the coating of the high wear-resistant fingerprint-resistant anti-dazzle coating on the plastic substrate by adopting a precise coating method, wherein the thickness of the coating is 4-15 mu m, and baking the plastic substrate for 1-3 min at 70-100 ℃ in an oven to dry the solvent; s3, coating the structure texture transfer template, and performing low-energy semi-curing surface drying by using 80-150 mJ/cm 2 of LED395nm/LED365nm energy; and S4, stripping, rolling and removing the structural texture transfer template, baking for 0.5-1 min at 80-120 ℃ for the second time through a baking oven, and completely curing by using a high-pressure mercury lamp with the energy of 300-800 mJ/cm 2 to obtain the high-wear-resistance fingerprint-proof anti-dazzle film.
In this embodiment, specifically, the step S2 of baking includes: the fluorine modified polyurethane acrylic ester migrates to the surface of the coating along with the drying of the solvent.
In this embodiment, specifically, the secondary baking in step S4 includes: the fluorine modified polyurethane acrylate migrates to the surface of the coating and the fluorine-containing chain segment stretches.
In this embodiment, specifically, the anti-dazzle film is prepared by a transfer printing method, so that the problems of poor storage stability, uneven coating appearance, poor wear resistance and the like of the anti-dazzle film prepared by the existing powder technology can be effectively solved, and the anti-fingerprint defect of the anti-dazzle film prepared by the transfer printing method can be further solved by a primary baking-low-energy semi-curing-secondary baking process of fluorine modified polyurethane acrylate.
Example 1
The preparation of the coating with high wear resistance, fingerprint resistance and anti-dazzle coating comprises the following steps: 60 parts by mass of fluorine modified polyurethane acrylate UA-895 (Zhongshan Jieda), 0.5 part by mass of flatting agent BYK3505, 2.5 parts by mass of photoinitiator 184 and 0.5 part by mass of TPO, 42 parts by mass of ethyl acetate and 18 parts by mass of butyl acetate are mixed and stirred uniformly to prepare the coating with high wear resistance, fingerprint resistance and anti-dazzle coating.
Preparation of a high wear-resistant fingerprint-resistant antiglare film: the method comprises the steps of adopting a precise coating method to coat a high-wear-resistance anti-fingerprint anti-dazzle coating on a PET plastic substrate, enabling the thickness of a dry film of the coating to be about 6um, drying a solvent for 1min at 80 ℃ through an oven, covering a structural texture transfer template, enabling the structural texture transfer template to be subjected to low-energy surface drying at 80mJ/cm < 2 >. Energy of LED395nm, stripping, rolling and removing the structural texture transfer template, baking a plastic substrate film coated with the anti-dazzle coating surface drying at 120 ℃ for 0.5min through the oven, and finally enabling the plastic substrate film to be subjected to full solidification at 300J/cm < 2 >. Energy of a high-pressure mercury lamp, thus obtaining the high-wear-resistance anti-fingerprint anti-dazzle film.
Example 2
The preparation of the coating with high wear resistance, fingerprint resistance and anti-dazzle coating comprises the following steps: 50 parts by mass of fluorine modified polyurethane acrylate UA-1020 (Zhongshan Jieda), 20 parts by mass of dipentaerythritol hexaacrylate, 0.5 part by mass of leveling agent TEGO RAD2010, 3 parts by mass of photoinitiator KIP160 and 0.5 part by mass of TPO, 45 parts by mass of methyl ethyl ketone and 20 parts by mass of methyl isobutyl ketone are mixed and stirred uniformly to prepare the coating of the high wear-resistant fingerprint-resistant anti-dazzle coating.
Preparation of a high wear-resistant fingerprint-resistant antiglare film: the method comprises the steps of adopting a precise coating method to coat a high-wear-resistance anti-fingerprint anti-dazzle coating on a PET plastic substrate, drying a solvent through a drying oven at 100 ℃ for 1min, covering a structural texture transfer template, peeling and winding the structural texture transfer template to remove the structural texture transfer template, baking the plastic substrate film coated with the anti-dazzle coating at 100 ℃ for 0.5min, and finally completely curing the plastic substrate film with the anti-dazzle coating at 500J/cm < 2 > by a high-pressure mercury lamp energy, thereby obtaining the high-wear-resistance anti-fingerprint anti-dazzle film.
Example 3
The preparation of the coating with high wear resistance, fingerprint resistance and anti-dazzle coating comprises the following steps: 35 parts of fluorine modified polyurethane acrylate UA-895 (Zhongshan Jieda), 35 parts of polyurethane acrylic resin BW-8099 (Guangzhou eight standing grain) fat, 10 parts of pentaerythritol tetraacrylate, 1 part of flatting agent DuPont FS-3100, 2.5 parts of photoinitiator 1173, 1.5 parts of BP and 0.5 part of TPO, 80 parts of methyl ethyl ketone and 40 parts of butyl acetate are uniformly mixed and stirred to prepare the coating of the high wear-resistant fingerprint-resistant anti-dazzle coating.
Preparation of a high wear-resistant fingerprint-resistant antiglare film: the method comprises the steps of adopting a precise coating method to coat high-wear-resistance anti-fingerprint anti-dazzle coating on a PMMA plastic substrate, enabling the thickness of a dry film of the coating to be about 4um, drying a solvent for 1min at 80 ℃ through an oven, covering a structural texture transfer template, enabling the structural texture transfer template to be subjected to low-energy surface drying at 100mJ/cm < 2 > through an LED365nm energy, stripping, rolling and removing the structural texture transfer template, baking a plastic substrate film coated with the anti-dazzle coating surface drying at 120 ℃ for 0.5min through the oven, and finally enabling the plastic substrate film to be subjected to complete solidification at 600J/cm < 2 > through a high-pressure mercury lamp energy, thus obtaining the high-wear-resistance anti-fingerprint anti-dazzle film.
Example 4
The preparation of the coating with high wear resistance, fingerprint resistance and anti-dazzle coating comprises the following steps: 70 parts by mass of fluorine modified polyurethane acrylate UA-1020 (Zhongshan Jieda), 0.5 part by mass of flatting agent TEGO RAD2300, 1.5 parts by mass of photoinitiator 184, 1.5 parts by mass of BP and 0.5 part by mass of TPO are mixed and stirred uniformly, and the coating with high wear resistance, fingerprint resistance and anti-dazzle coating is prepared.
Preparation of a high wear-resistant fingerprint-resistant antiglare film: the method comprises the steps of adopting a precise coating method to coat high-wear-resistance anti-fingerprint anti-dazzle coating on a PC plastic substrate, enabling the thickness of a dry film of the coating to be about 15um, drying a solvent for 3min through a drying oven at 70 ℃, covering a structural texture transfer template, enabling the structural texture transfer template to be subjected to low-energy surface drying with the energy of 150mJ/cm < 2 > through an LED365nm, stripping, rolling and removing the structural texture transfer template, baking a plastic substrate film coated with the anti-dazzle coating surface drying for 1min through a drying oven at 80 ℃, and finally enabling the plastic substrate film to be subjected to full curing with the energy of 600J/cm < 2 > through a high-pressure mercury lamp, thus obtaining the high-wear-resistance anti-fingerprint anti-dazzle film.
Example 5
The preparation of the coating with high wear resistance, fingerprint resistance and anti-dazzle coating comprises the following steps: 10 parts of fluorine modified polyurethane acrylate UA-1020 (Zhongshan Jieda), 35 parts of polyurethane acrylic resin EB-225 (Zhan Xin resin), 45 parts of dipentaerythritol pentaacrylate, 0.5 part of leveling agent TEGO RAD2200, 2.5 parts of photoinitiator 2959, 1.5 parts of TZT and 0.5 part of TPO, 63 parts of ethyl acetate and 27 parts of butyl acetate are mixed and stirred uniformly to prepare the coating of the high wear-resistant fingerprint-proof anti-dazzle coating.
Preparation of a high wear-resistant fingerprint-resistant antiglare film: the method comprises the steps of adopting a precise coating method to coat high-wear-resistance anti-fingerprint anti-dazzle coating on a PET plastic substrate, enabling the thickness of a dry film of the coating to be about 8um, drying a solvent for 1.5min at 80 ℃ through a baking oven, covering a structural texture transfer template, enabling the energy of the structural texture transfer template to be 110mJ/cm <2 > to be low-energy surface dryness through an LED395nm, stripping, rolling and removing the structural texture transfer template, baking a plastic substrate film coated with the anti-dazzle coating surface dryness through the baking oven at 100 ℃ for 1min, and finally enabling the high-pressure mercury lamp energy to be 800J/cm <2 > to be completely solidified, thus obtaining the high-wear-resistance anti-fingerprint anti-dazzle film.
Comparative example 6
The preparation of the coating with high wear resistance, fingerprint resistance and anti-dazzle coating comprises the following steps: 60 parts by mass of fluorine modified polyurethane acrylate UA-895 (Zhongshan Jieda), 0.5 part by mass of flatting agent BYK3505, 2.5 parts by mass of photoinitiator 184 and 0.5 part by mass of TPO, 42 parts by mass of ethyl acetate and 18 parts by mass of butyl acetate are mixed and stirred uniformly to prepare the coating with high wear resistance, fingerprint resistance and anti-dazzle coating.
Preparation of a high wear-resistant anti-dazzle film: and (3) coating the high-wear-resistance fingerprint-proof anti-dazzle coating on the PET plastic substrate by adopting a precise coating method, wherein the thickness of a dry film of the coating is about 6um, drying the solvent for 1min at 80 ℃ through an oven, covering the structural texture transfer template, completely curing the structural texture transfer template by using a high-pressure mercury lamp with the energy of 400J/cm < 2 >, and stripping, rolling and removing the structural texture transfer template to obtain the high-wear-resistance anti-dazzle film.
The performance of the above examples is shown in Table 1.
TABLE 1
Transmittance and haze: tested according to ASTM D1003.
Adhesion force: tested according to ASTM D3359.
Hardness: 750g of the test piece was loaded according to GB/T6739-2006.
Abrasion resistance: japanese Bonstar # 0000 steel wool, 1000g loaded, friction head 1cm x 1cm, observed the maximum round trip number without scratch.
Water drop angle: tested according to ISO 15989-2004.
In this example, specifically, examples 1-5 all show 90 ° or more, as evidenced by the surface contact angle data for water, that the coating surface is hydrophobic, i.e., fingerprint and stain resistant.
In summary, according to the high-wear-resistance anti-fingerprint anti-dazzle film and the preparation method thereof, through setting the primary baking, the low-energy semi-curing and the secondary baking, fluorine modified polyurethane acrylate volatilizes to the surface along with a solvent and realizes stretching of fluorine-containing chain segments on the surface of the coating, so that the high-wear-resistance anti-fingerprint anti-dazzle coating has low surface energy, and finally, the anti-dazzle film prepared by a transfer printing method has the effects of fingerprint resistance and dirt resistance.
With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.

Claims (8)

1. A highly abrasion-resistant fingerprint-resistant antiglare film comprising:
a plastic substrate and a high wear-resistant fingerprint-proof antiglare coating disposed thereon; wherein the method comprises the steps of
The coating of the high wear-resistant fingerprint-resistant anti-dazzle coating comprises the following components in parts by mass:
10-70 parts of fluorine modified polyurethane acrylic ester;
0-35 parts of polyurethane acrylic resin;
0-45 parts of acrylic acid monomer;
0.5 to 1 part of leveling agent;
3-5 parts of photoinitiator;
60-120 parts of solvent; wherein the method comprises the steps of
The fluorine modified polyurethane acrylic ester is cured on the surface of the high wear-resistant fingerprint-resistant anti-dazzle coating through low-energy semi-curing and secondary baking migration curing, and the fluorine-containing chain segment is stretched;
the preparation method of the high-wear-resistance fingerprint-proof anti-dazzle film comprises the following steps:
step S1, mixing and stirring according to parts by weight to prepare the coating with the high wear-resistant fingerprint-resistant anti-dazzle coating;
S2, coating the coating of the high wear-resistant fingerprint-resistant anti-dazzle coating on the plastic substrate by adopting a precise coating method, wherein the thickness of the coating is 4-15 mu m, and baking the plastic substrate for 1-3 min at 70-100 ℃ in an oven to dry the solvent;
S3, coating the structure texture transfer template, and performing low-energy semi-curing surface drying by using 80-150 mJ/cm 2 of LED395nm or LED365nm energy;
S4, stripping, rolling and removing the structural texture transfer template, and then baking for 0.5-1 min at 80-120 ℃ in an oven for the second time, wherein the structural texture transfer template is completely solidified by a high-pressure mercury lamp with energy of 300-800 mJ/cm 2, so as to obtain the high-wear-resistance fingerprint-proof antiglare film;
the primary baking in the step S2 includes:
the fluorine modified polyurethane acrylic ester migrates to the surface of the coating along with the drying of the solvent;
The secondary baking in the step S4 includes:
the fluorine modified polyurethane acrylate migrates to the surface of the coating and the fluorine-containing segment stretches.
2. The high abrasion-resistant fingerprint-resistant antiglare film of claim 1,
The plastic substrate is any one of polyethylene terephthalate, polycarbonate, polyacrylate, thermoplastic polyurethane and cellulose triacetate.
3. The high abrasion-resistant fingerprint-resistant antiglare film of claim 1,
The reaction functionality of the fluorine modified polyurethane acrylic ester is more than or equal to 6.
4. The high abrasion-resistant fingerprint-resistant antiglare film of claim 1,
The reaction functionality of the polyurethane acrylic resin is more than or equal to 3.
5. The high abrasion-resistant fingerprint-resistant antiglare film of claim 1,
The acrylic acid monomer is any one or a combination of more than one of pentaerythritol triacrylate, pentaerythritol tetraacrylate, pentaerythritol trimethacrylate, pentaerythritol tetramethacrylate, dipentaerythritol hexaacrylate and trimethylolpropane triacrylate.
6. The high abrasion-resistant fingerprint-resistant antiglare film of claim 1,
The leveling agent is any one of fluorine modified leveling agent and silicon modified leveling agent.
7. The high abrasion-resistant fingerprint-resistant antiglare film of claim 1,
The photoinitiator is any one or a combination of a plurality of cleavage type photoinitiators and hydrogen abstraction type photoinitiators.
8. The high abrasion-resistant fingerprint-resistant antiglare film of claim 1,
The solvent is any one or a combination of a plurality of isopropanol, isobutanol, methyl ethyl ketone, methyl isobutyl ketone, ethyl acetate, butyl acetate, propylene glycol methyl ether and propylene glycol methyl ether acetate.
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