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Method and gaskets for casting acrylic films

An acrylic resin and acrylate technology, applied in other household appliances, flat products, household appliances, etc., can solve problems such as difficulty in achieving uniform thickness, wrinkles, and film deformation

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

[0003] There is no problem when using the above method to prepare a film with a thickness of more than 1 mm. However, when a thin film with a thickness of not more than 1 mm is prepared, there is a problem in that wrinkles are formed on the film when the film is cured or due to changes in the flatness of the film surface. membrane deformation
In particular, as a material for forming an acrylic resin film, when only monomers are directly injected into a mold for casting, the film is polymerized and cured to shrink compared to the case of using a polymer slurry dissolved in a small amount of monomers more, therefore, it is difficult to achieve uniform thickness

Method used

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  • Method and gaskets for casting acrylic films
  • Method and gaskets for casting acrylic films
  • Method and gaskets for casting acrylic films

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Embodiment approach

[0036] Hereinafter, the present invention will be described in detail with reference to examples. However, the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to fully convey the concept of the present invention to those skilled in the art.

Embodiment 1

[0042] Acrylic resin films were cast using gaskets made of foamed PVC (polyvinyl chloride) which when cured had a shrinkage of 20% under vacuum compression and showed a thickness change from 500 μm to 400 μm. Use this gasket for cast acrylic films. Specifically, a gasket made of foamed PVC was placed between two glass substrates with a size of 20CM×30CM, a composition containing the materials in Table 1 was injected, and then cured. At this time, the shrinkage ratio of the acrylic resin film material prepared by using the composition including the material of Table 1 was 11%. Curing was performed under the following conditions. Curing was initiated at 25°C under atmospheric conditions and the temperature was gradually increased to 100°C over 4 hours. After keeping it at 100°C for 2 hours, the temperature was lowered to 25°C over 4 hours. After the curing step, the acrylic resin film is separated from the substrate and the spacer, the thickness deviation of the film is not m...

Embodiment 2

[0044] An acrylic resin film was prepared in the same manner as in Example 1 except for using foamed PE (polyethylene), which had a shrinkage rate of 25% under vacuum compression and showed a shrinkage rate of from 400 μm to 300 μm in curing, as the gasket. Thickness changes. After the curing step, the acrylic resin film is separated from the substrate and the spacer, the thickness deviation of the film is not more than 8%, and the thickness is in the range of 305-330 μm.

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Abstract

The present invention relates to a method for casting an acryl film, which includes the steps of injecting a material of the acryl film into a space that is formed from a pair of substrates and a gasket positioned between a pair of substrates, and curing the material of the acryl film. The shrinkage ratio of the gasket is not less than 10% after the acryl film is subjected to the curing step, or the shrinkage ratio of the gasket after the acryl film is subjected to the curing step is the same as or larger than the shrinkage ratio of the material of the acryl film.

Description

technical field [0001] The present invention relates to a method and gasket for casting an acrylic resin film. More specifically, the present invention relates to a method and gasket for casting acrylic resin films with a thickness not exceeding 1 mm. This application claims priority from Korean Patent Application No. 10-2007-0084994 filed in KIPO on Aug. 23, 2007, the disclosure of which is incorporated herein by reference in its entirety. Background technique [0002] Such as figure 1 and 2 As shown, the conventional casting method of acrylic resin film is carried out as follows: add a soft or hard gasket for controlling the thickness of the acrylic resin film between two unit casting plates made of glass or the like, seal it, fill the polymer raw material, solidify it in a constant temperature water bath or oven, and then separate the film. [0003] There is no problem when using the above method to prepare a film with a thickness of more than 1 mm. However, when a th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29D7/01
CPCB29C39/006B29C39/26B29C39/42B29K2033/04B29C39/02B29C39/22B29D7/01
Inventor 金宇星金源国洪瑛晙姜杨求崔贤权冻铸金智善
Owner LG CHEM LTD
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