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Plasticizer for protective films

A technology of protective film and plasticizer, used in instruments, layered products, synthetic resin layered products, etc., can solve the problem of difficult compliance of protective films, and achieve the effect of increasing glass transition temperature and increasing hardness

Inactive Publication Date: 2009-09-09
LOFO HIGH TECH FILM BESCHRANKTERHAFTUNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has proven to be problematic here that there are a large number of parameters which, with often opposite effects, often develop oppositely in the case of changes in the composition of the protective film and thus lead to suitably thinner protective films (for example with thickness in the range of 10 to 60 μm) is very difficult to meet the required demand characteristics

Method used

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  • Plasticizer for protective films
  • Plasticizer for protective films
  • Plasticizer for protective films

Examples

Experimental program
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Effect test

Embodiment

[0052] The following examples are used to illustrate the present invention without limiting the scope of the invention:

[0053] In the experiments listed hereinafter, the example number is always given with emphasis in curly brackets {}, {REF} designating a reference example.

[0054] Experiment 1: TAC-films with different plasticizers

[0055] TAC-films with a thickness of 40 μm were prepared with various plasticizers selected from the following table:

[0056] Table 1: Plasticizers

[0057]

[0058] * ) is also used below as the name

[0059]The preparation was carried out without any increase in temperature using a lacquer vehicle consisting of 16% by weight of cellulose triacetate (60.8% bound acetyl content) in dichloromethane / methanol (90 / 10 v / v). In the case of plasticizers, the paint was filtered through Calmuc (cotton fabric). It is then stored overnight in a rolling cabinet (where dye can be added if necessary). As long as the anti-blocking agent (silica) i...

Embodiment 23

[0103] Example 23: Production of cellulose triacetate with a thickness of 40 μm on an industrial scale cast film

[0104] By 2000kg cellulose triacetate (acetylation degree 2.96), 11330kg methylene chloride: methanol mixture (9: 1v / v), 136kg TPP, 136kg Hexamoll 30 kg of UV-absorber (benzophenone-6), a homogeneous solution is produced under a stirring, cooling and heating cycle and the solution is heated to about 40° C. for degassing. The solution is filtered through a plurality of metal non-woven filters (pore size 5-7 μm) via an intermediate tank at elevated pressure and temperature and then mixed directly (in-line) with the likewise filtered metered-in solution, the resulting The metering solution comprises, in addition to the substances mentioned above, a further dichloromethane:methanol mixture (9:1 v / v) and an antiblocking additive.

[0105] After tempering to 31° C., the solution is cast in the desired thickness (casting gap approx. 235 μm) under a methylene chlori...

Embodiment 24

[0108] Example 24: Glass transition temperature

[0109] Compared with those films using only triphenyl phosphate as plasticizer, in similar example Films prepared under the production conditions of 23 have an increased glass transition temperature:

[0110] Table 8: Glass Transition Temperatures

[0111]

[0112] The water vapor transmission rate of the film is higher than that of other films using TPP alone as a plasticizer. Corresponding films on the other hand have a water vapor transmission rate which is at least 10% lower.

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Abstract

The present invention discloses rotective films for plasma displays, spectacles or especially polarizers (for example based on cellulose triacetate) comprising particular plasticizers as a constituent of imaging devices of liquid-crystal type or of spectacles, their production and use, and liquid-crystal display devices and film polarizers producible with them, and also further subject matter of the invention specified in the description, are particularly suitable for thin films and have advantageous properties, for example low water vapor permeability. The plasticizers used are one or more of the formula (I) in which the radicals are each as defined in the rest of the disclosure and are branched-chain alkyl radicals having 9 or 10 carbon atoms, and advantageously one or more further plasticizers.

Description

technical field [0001] The present invention relates to novel (cellulose ester-based, especially triacetylcellulose (=TAC)-based) protective films for screens (displays), especially for polarizers, which have the potential as liquid-crystal-type imaging devices Specific plasticizers for components or eyeglasses, the preparation and use of said protective films and the liquid crystal display devices and film polarizers produced therewith, and other subject-matters of the invention mentioned below. Background technique [0002] Polarizers, such as those which can be used especially for liquid crystal display devices, but also for the manufacture of (for example) sunglasses, protect films on one or more sides, which are usually laminated to (for example) with the use of an adhesive material Stretched, fixed and cleaned) polarizer. The protective film, the actual polarizer (polarizing film) and the adhesive layer together form a (thus multilayer) film polarizer in the glossary ...

Claims

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Application Information

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IPC IPC(8): B32B27/22G02B1/10C08J5/18G02B5/30
CPCG02B1/105C08J2301/12C08K5/12G02B5/3025C08J5/18G02B1/16G02B1/14C08L1/12B32B27/22G02B1/10G02B5/30
Inventor S·屈布勒S·埃伯哈特P·阿伦茨U·西曼
Owner LOFO HIGH TECH FILM BESCHRANKTERHAFTUNG
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