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Copolyester, process for producing the same, and polyester film

A technology of copolyester and manufacturing method, which is applied in the field of copolyester, can solve the problems of unindustrialization, high price of resin products, and failure to find promising applications, etc., and achieves the effect of excellent cost performance

Active Publication Date: 2011-07-06
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, in these prior arts, due to the use of 1,4-butanediol, the high purity obtained through multiple distillation and purification (for example, the high purity of 95% by weight or more or 99% by weight or more) The long-chain aliphatic dicarboxylic acid, so the cost is high, forming expensive resin products, so can not find a promising use, can not be industrialized

Method used

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  • Copolyester, process for producing the same, and polyester film
  • Copolyester, process for producing the same, and polyester film
  • Copolyester, process for producing the same, and polyester film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0144] The above-mentioned copolyester 1 was supplied to a vent type (vent type) counter-rotating twin-screw extruder (3 vents, L / D = 42), and was passed through a vacuum while heating at 260°C. Exhaust port 2 places and short pipe. Then, it is extruded into a sheet from a slit-shaped die, and is brought into close contact with the casting drum by applying static electricity, cooled and solidified to form an unstretched film. Unstretched film can be stably obtained, and the physical properties of the obtained film are shown in Table 3, which shows good transparency. Furthermore, by adding bisoxazoline in copolyester 1, the flexibility and time-resistant The variability is also excellent.

Embodiment 2～5

[0146] An unstretched film was produced in the same manner as in Example 1, except that the above-mentioned copolyesters 2, 3, 8, and 9 were used, respectively. The physical properties of the obtained unstretched film are shown in Table 3.

Embodiment 2

[0147] The film of Example 2 was excellent in transparency.

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Abstract

The cost of producing a polyester resin or film excellent in transparency, flexibility, etc. is reduced, and a flexible polyester film producible at a low cost and a flexible polyester resin suitable for the production are provided. The resin is a copolyester synthesized from an acid ingredient comprising either an oligomerized fatty acid comprising 15-95 wt.% fatty acid dimer and 5-85 wt.% fattyacid trimer or a derivative thereof and a glycol ingredient, and has a melt viscosity as measured at 250 DEG C of 1,000-3,000 P. The flexible polyester film is obtained from this copolyester by melt formation.

Description

technical field [0001] The present invention relates to a copolyester and a soft polyester film capable of forming a soft molded article, and more specifically, to a copolyester suitable for applications such as industrial materials and packaging materials that must have transparency, easy moldability, and heat resistance. Polyester film and copolyester as its raw material. Background technique [0002] Polyvinyl chloride-based films are representative of conventional flexible films. This polyvinyl chloride film is excellent in weather resistance, and is suitable for various processing such as embossing, and furthermore, it has the advantage of being available at low cost, so it has been preferably used as a flexible film. [0003] However, the polyvinyl chloride film has the problem of generating toxic gas when the film is burned by fire or the like, and the problem that the plasticizer is easy to bleed. The new soft film formed by the resin. [0004] For the use of flex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/00C08J5/18C08L67/00
CPCC08J2367/02C08G63/16C08J5/18C08G63/00C08G63/88C08G63/91
Inventor 神泽岳史松本太成木村将弘
Owner TORAY IND INC