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Process for producing raw film for retardation film made of polypropylene resin

A technology of polypropylene-based resin and retardation film, which is applied in the field of coil film manufacturing for polypropylene-based resin retardation film, which can solve the problems of film transparency damage, etc., and achieve the effect of easy peeling and small retardation

Inactive Publication Date: 2013-04-03
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, especially in the case of using a polypropylene resin, there is a problem that the transparency of the produced film is impaired.

Method used

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  • Process for producing raw film for retardation film made of polypropylene resin
  • Process for producing raw film for retardation film made of polypropylene resin
  • Process for producing raw film for retardation film made of polypropylene resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Below, based on Examples 1-6 and Comparative Examples 1-3 and Figure 1 ~ Figure 3 , the present invention will be described more specifically, but the present invention is not limited to the following examples.

[0080] (Example 1)

[0081] Using a 90mm￠extruder 10 (screw: L / D=32) heated at 250°C, an ethylene-propylene copolymer (ethylene content=5% by weight), Tm (melting point)=134°C, MFR (melt flow rate) = 8g / 10 minutes) melt kneading, and feed from the extruder 10 to the adapter (adater) and T-die 12 (both set to 250°C) that are installed next to the extruder 10, A resin film (molten resin) of an ethylene-propylene copolymer in a molten state is ejected from an ejection port (die lip) 12a of the die 12 . The temperature of the molten resin in the discharge port 12a portion of the T-die 12 was 250°C. Also, use figure 1 The touch roll 14 and the cooling roll 16 shown pinch the molten resin with a nip length of 5 mm and a linear pressure of 6 N / mm, and cool and so...

Embodiment 2

[0084] Except having set the surface temperature T2 of the thin metal outer cylinder 14b of the touch roll 14 to 80 degreeC, it carried out similarly to Example 1, and obtained the roll film F for polypropylene resin retardation films of Example 2.

Embodiment 3

[0086] In addition to setting the surface temperature T2 of the thin-walled metal outer cylinder 14b of the touch roll 14 to 100°C, the speed of the touch roll 14 was set to 15.9m / min, and the speed of the cooling rolls 16 and 18 were both set to 17.4m Except for / min, it carried out similarly to Example 1, and obtained the roll film F (thickness: 80 micrometers) for polypropylene-type resin retardation films of Example 3.

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Abstract

There is provided a process for producing a precursor film for a polypropylene-based resin retardation film that can yield films with almost no orientation and with high transparency. The process for producing a precursor film for a polypropylene-based resin retardation film comprises a step of pressing a molten sheet formed by extruding a molten polypropylene-based resin from a T-shaped die 12 at 180° C. or higher and 300° C. or lower between a cooling roll 16 having a surface temperature regulated to −5° C. or higher and 30° C. or lower and a touch roll 14 having a surface temperature regulated to 80° C. or higher and 150° C. or lower, whereby the molten sheet is cooled and solidified.

Description

technical field [0001] The present invention relates to a method for producing a roll (raw) film for a polypropylene-based resin phase difference film. Background technique [0002] Optical films such as retardation films and polarizer protective films that are components of liquid crystal display devices (liquid crystal panels) require high optical uniformity in order to improve contrast and viewing angles. [0003] Here, the retardation film is produced by stretching a non-oriented retardation film web film so that molecules are oriented in the same direction and to the same degree. That is, by controlling the orientation axis and the degree of orientation, it is of course possible to form a retardation film in which a desired retardation is uniformly displayed. Therefore, for the roll film for retardation film before stretching, it is required that the film itself has no defects such as fish eyes, rashes (bu ツ), or streaks such as mold scratches, high transparency, and n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C47/88B29C47/14G02B5/30G02F1/13363B29K23/00B29L7/00B29L11/00B29C48/08B29C48/305
CPCB29C47/0021B29C47/886B29C47/8845B29C48/08B29C48/914B29C48/9155
Inventor 高畑弘明高桥义则日野享子石上佳照小崎修司藤冈修司
Owner SUMITOMO CHEM CO LTD
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