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Double-axle oriented polyester film and making method thereof

A polyester film, biaxially oriented technology, which is rarely used, and even excellent in productivity, has the potential to develop various applications, and can solve problems such as unindustrialization and ignorance

Inactive Publication Date: 2000-03-29
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] As mentioned above, a high-quality biaxially oriented polyester film composed of a compatible blend of PET and PEI with a single glass transition temperature has not been recognized in the past and has not been industrialized.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0226] PET (PET) chips (50 wt%) with an intrinsic viscosity of 0.85 and "Ultem" 1010 (50 wt%) with an intrinsic viscosity of 0.68 manufactured by General Electric were supplied to a co-rotating exhaust type heated to 290°C. A screw mixing extruder is used to make blended chips containing "Ultem" (50wt%). The slice obtained here was slightly cloudy, and the average dispersion diameter of the dispersion domain was 0.5 μm.

[0227] Then, 40 parts by weight of the blended chips and 60 parts by weight of PET chips with an intrinsic viscosity of 0.65 obtained by the above-mentioned granulation operation were vacuum-dried at 180° C. for 3 hours, and then put into a unit with a screw diameter of 150 mm heated to 290° C. Screw extruder, melt extrusion according to the conditions in Table 1, at a shear rate of 10 seconds -1 Make it pass through a fiber sintered stainless steel metal filter (5 μm cut pattern (カツト)), and then extrude it into a thin sheet from a T-shaped die. A speed of ...

Embodiment 2～4

[0230] Except for melt extrusion under the conditions shown in Table 1, all the others were made into a film in the same manner as in Example 1 to obtain a polyester film composed of PET and "Uultem". The properties of the film are shown in Tables 2 and 3. Thickness unevenness and thermal dimensional stability are good, but the transparency is slightly inferior compared with Example 1 due to deviation from the optimum extrusion conditions. Furthermore, the number of coarse protrusions on the surface increased. Example 5, 6

Embodiment 5、6

[0231] Films were formed in the same manner as in Example 1, except that the content of "Uultem" and film forming conditions were changed as shown in Table 1. The properties of the film are shown in Tables 2 and 3. Even if the content of "Uultem" is changed, a high-quality polyester film with a single glass transition temperature, less coarse protrusions on the surface, good transparency and excellent thermal dimensional stability can be obtained. Example 7

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PUM

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Abstract

A biaxially oriented polyester film, comprising a polyester (A) at least mainly composed of ethylene terephthalate and a polyether imide (B), having a single glass transition temperature, and having a refractive index of 1.60 to 1.80 at least in either the machine direction or the transverse direction, has excellent thermal dimensional stability, clarity and is easy to produce. It can be prepared by melt-extruding a polyester (A) at least mainly composed of ethylene terephthalate and polyether imide (B), to mold a resin sheet with a single glass transition temperature, and stretching the resin sheet at a ratio of 3.0 to 10 times in the machine direction and at a ratio of 3.0 to 10 times in the transverse direction.

Description

Background of the invention [0001] The present invention relates to a polyester film whose quality can be greatly improved and its manufacturing method. In more detail, it relates to a film with excellent thermal dimensional stability and transparency, good productivity, and suitable as a film for magnetic recording, a film for packaging, a film for heat-sensitive stencil printing base paper, a film for capacitors, and a heat-sensitive transfer tape. Polyester film for various industrial materials such as films, photographic and plate-making films, and electrical insulation films, and a method for producing the same. [0002] Plastic film enables the continuous production of large-area films that cannot be obtained from other materials, and exerts its strength, durability, transparency, softness, surface properties and other characteristics. It is used in magnetic recording, agriculture, and packaging. It is adopted in many necessary fields such as use, building materials use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L67/02C08L79/08
CPCC08J5/18C08J2379/08Y10S428/91C08L79/08C08J2367/02C08L67/02G11B5/7305Y10T428/2495Y10T428/24355Y10T428/24967Y10T428/31786Y10T428/31721G11B5/73935G11B5/73931
Inventor 恒川哲也细川博文东大路卓司
Owner TORAY IND INC
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