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Polyester film and its manufacturing method

A manufacturing method and film technology, applied in the field of polyester film, can solve the problems of low elongation, inability to become, and not exerting the characteristics of PBT film, and achieve the effect of suppressing fracture and improving balance.

Active Publication Date: 2018-07-06
TOYOBO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned prior art has the following problem as can be seen from the results of the Examples: the elongation rate is low because the deformation rate in the MD direction is only increased, and it cannot be a film with a balance between the MD direction and the TD direction.
However, in the prior art described above, layers made of PET and PEN resins other than PBT are laminated, so the stretching temperature is stretched at the stretching temperature of PET and PEN whose Tg is higher than that of PBT. From the perspective of the Tg of PBT, it is Stretching at high temperature
Therefore, the characteristics of the original PBT film are not exhibited, and there are two kinds of resin compositions in the film, so it is difficult to re-add the cutting waste and the like during film production to the raw materials for recycling, and there is an economic disadvantage.

Method used

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  • Polyester film and its manufacturing method
  • Polyester film and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105]Using a twin-screw vented extruder, add a masterbatch containing PBT resin (NOVADURAN5020 manufactured by Mitsubishi Engineering Plastics, melting point 220° C.) and calcium carbonate as a lubricant, and mix so that the lubricant concentration is 2000 ppm. The obtained material was heated at 270° C. It was melted at a temperature of 270° C., cast from a T-die at 270° C., and adhered to a cooling roll at 0° C. by an electrostatic bonding method to obtain an unstretched film. The surface temperature of the cooling roll was measured at intervals of 10 cm in the width direction (thermocouple), and as a result, the variation was 3° C. or less. Next, 3.2-fold roll stretching was performed in the longitudinal direction at 60°C, and then 3-fold stretching was performed in the transverse direction at 80°C using a tenter, followed by tension heat treatment at 200°C for 3 seconds and relaxation treatment for 1 second. , cut off and removed both ends to obtain a PBT film with a thic...

Embodiment 2

[0107] Using a twin-screw vented extruder, a masterbatch containing PBT resin (NOVADURAN 5020 manufactured by Mitsubishi Engineering Plastics) and calcium carbonate as a lubricant was added, blended so that the lubricant concentration was 2000ppm, and the resulting material was melted at 270°C, and then The melt line was directed to a 12 element static mixer (STMX). In this way, the division / stacking of the PBT melt was carried out, and a multilayer melt made of the same raw material was obtained. Thereafter, it was introduced into a T-die at 270° C., cast, and adhered to a cooling roll at 15° C. by an electrostatic bonding method to obtain an unstretched film. The surface temperature of the cooling roll was measured at intervals of 10 cm in the width direction (thermocouple), and as a result, the variation was 3° C. or less. Next, 3.8-fold roll stretching is performed in the longitudinal direction at 60°C, and then 3-fold stretching is performed in the transverse direction a...

Embodiment 3～4

[0109] Thin films were obtained under the conditions described in Table 1. Table 1 shows the film forming conditions, physical properties, and evaluation results of the obtained thin film. In addition, Ecoflex (registered trademark) used the poly(butylene adipate-co-butylene terephthalate) copolymer (PBAT) manufactured by BASF JAPAN LTD.

[0110] [Table 1]

[0111]

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Abstract

Provided is a polyester film that can be implemented industrially and is excellent in the balance of mechanical properties in the MD and TD directions, impact resistance, and the like. A polyester film formed of a polyester resin containing 60% by mass or more of polybutylene terephthalate, having an elongation at break of 80% or more in MD and a break elongation in TD of 80% or more, The plane orientation is 0.12 to 0.14, the impact strength is 0.05 J / μm or more, and the piercing strength is 0.5 N / μm or more.

Description

technical field [0001] The present invention relates to polyester film and its manufacturing method. More specifically, it relates to a polyester film which is suitable for applications where nylon films or other flexible films are currently used, and which is excellent in balance of impact resistance, flexibility, and mechanical strength, and a method for producing the same. Background technique [0002] Since polybutylene terephthalate (PBT) has excellent mechanical properties and impact resistance, it has been used as an engineering plastic until now, and it is also used as a useful material especially from the viewpoint of a fast crystallization rate and excellent productivity. However, PBT is difficult to biaxially stretch due to its fast crystallization rate. This is because the orientation during stretching causes crystallization, making stretching difficult. On the other hand, in order to make use of the original characteristics of PBT, researches have been carried...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18
CPCC08J5/18C08J2367/02B29D7/01C08L67/03
Inventor 清水敏之中谷伊志后藤孝道
Owner TOYOBO CO LTD
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