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Photochromic films and method for manufacturing the same

一种光致变色膜、光致变色的技术，应用在化学仪器和方法、光学、光学元件等方向，能够解决形成皱纹表面、差透明性、很难达到均匀的厚度等问题，达到优异透明度和耐久性、膜表面缺陷小、厚度偏差小的效果

Active Publication Date: 2010-07-21
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with these methods, since a constant portion of visible rays is always blocked regardless of the amount of light, there is a disadvantage that human vision is obstructed at night or in cloudy weather
Since most of these films have poor transparency, they are used in fields such as agricultural films that do not require predetermined transparency properties, and cannot be used as photochromic films for vehicles that require an excellent view
[0004] In Korean Unexamined Patent Application Publication No. 2003-0089544, results are disclosed in which a polyester (PET) film is used as a base film on which a photochromic acryl-based adhesive to prepare a photochromic film and use the photochromic film as a film for a tanning film for vehicles, but in this case, there is a problem in that due to the poor durability of the photochromic film, The membrane is easily damaged
[0006] There is no problem when using the above-mentioned casting method to produce a film with a thickness of more than 1 mm, but when producing a film with a thickness of not more than 1 mm, there is a problem that the film is deformed, such as wrinkles formed on the film during curing or in the film. Defects form on the surface
In particular, in the case where the monomer is directly injected into a mold and cast, compared to the case where a polymer as a material for forming a film is dissolved in a solvent and used, since the polymerization and curing are simultaneously The film shrinks, making it difficult to achieve a uniform thickness

Method used

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  • Photochromic films and method for manufacturing the same

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preparation example Construction

[0048] In the method of manufacturing a photochromic film according to the present invention, the material of the spacer is not particularly limited as long as it does not dissolve in the photochromic composition and has shrinkage according to curing as described above. For example, foamed polyethylene, foamed polyvinyl chloride, foamed PDMS (polydimethylsiloxane), foamed polystyrene, foamed polyurethane, and the like can be used. The spacers may be hollow in shape, or may be filled. Furthermore, its section may be circular, rectangular or trapezoidal, and it may be conical. Depending on the desired thickness of the membrane, one skilled in the art can determine the thickness of the spacer, and according to the desired size of the membrane, the size of the spacer can be determined.

[0049] In the present invention, the material of the substrate may be used without any limitation as long as it is known in the art. For example, glass, metal, plastic substrates can be used, bu...

Embodiment 1

[0058] A spacer formed of foamed PVC (polyvinyl chloride), which has a shrinkage of 20% when cured under vacuum compression, shows a thickness between 500- Variation between 400µm. Then, fill the photochromic composition (shrinkage rate: 17%) formed by the composition of the following table 1 between the glass plates, start curing at 25 ° C under normal pressure conditions, and gradually increase the temperature within 4 hours to 100°C, hold at 100°C for 2 hours, then lower the temperature to 25°C over 4 hours. After the curing step, the thickness deviation of the film separated from the glass substrate and spacer was within 5%, and the thickness was 395-410 μm. In addition, when the film is discolored, the optical density is lower than 20% and the oxygen transmission rate is 100 cc / m 2 day atm. The samples were exposed to an ATLASUV 2000 (an accelerated weather resistance tester) using a light intensity of 0.77W / m at 340nm 2 Under the condition of UVA fluorescent lamp at ...

Embodiment 2

[0062] A film was prepared in the same manner as in Example 1 except that foamed PE (polyethylene) having a shrinkage rate of 25% (showing a thickness varying between 400 to 300 μm) was used as a spacer when curing was performed under vacuum compression. After the curing step, the thickness deviation of the film separated from the glass substrate and spacer was within 8%, and the thickness was 305-330 μm. In addition, when the film is discolored, the optical density is lower than 20% and the oxygen transmission rate is 100 cc / m 2 day atm. The sample was exposed to ATLAS UV 2000 (an accelerated weather resistance tester) using a light intensity of 0.77W / m at 340nm 2 Under the condition of UVA lamp at 60°C for 8 hours, and repeated 4 hours of condensation at 50°C as a cycle to measure the optical density and measure the λ min The time required for the transmittance at that point to increase to half of the transmittance at the earlier discoloration step. As a result, the time ...

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Abstract

The present invention provides a photochromic film which is formed by curing a photochromic composition and includes a multifunctional (metha)acrylate-based monomer that has two or more functional groups, and a photochromic dye, a product including the same, and a method for producing the photochromic film.

Description

technical field [0001] The invention relates to a photochromic film and a method for preparing the photochromic film. More specifically, the present invention relates to a photochromic film having excellent transparency and durability, small thickness deviation, few film surface defects, and relatively high density, and a method for producing the photochromic film. This application claims priority from Korean Patent Application No. 10-2007-0085336 filed with KIPO on Aug. 24, 2007, the disclosure of which is incorporated herein by reference in its entirety. Background technique [0002] Generally, a method of coating a color film on a light-transmitting article that receives direct rays of light directly for a long period of time (for example, glass for vehicles or buildings), or using a glass on which a metal component is vacuum-deposited way to block part of the light. However, with these methods, since a constant portion of visible rays is always blocked regardless of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18
CPCB32B17/10036B32B17/10706G02B5/23B32B17/10917B32B17/10486C08J5/18C08F2/50C08F2/44C08J2333/08C08J2333/10C08L2203/16
Inventor 金宇星崔贤金智善权冻铸洪瑛晙
Owner LG CHEM LTD
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