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Heat-shrinkable polyester film and heat-shrinkable polyester film roll

A heat shrinkable, polyester technology, applied in the field of film rolls, can solve the problems of large changes in heat shrinkage characteristics, pattern deformation, increase in defect rate, etc., and achieve the effect of excellent heat shrinkage characteristics

Inactive Publication Date: 2006-11-29
TOYOBO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the appearance will be poor due to insufficient shrinkage, uneven shrinkage, wrinkles, pattern deformation, longitudinal shrinkage, etc., and it will become a defective product and cannot be shipped.
Since labels, bags, etc. for the same final product are usually processed from the same film roll, if the thermal shrinkage characteristics of the film on the same film roll fluctuate greatly, there is a problem that the defect rate in the heat shrinking process increases.

Method used

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  • Heat-shrinkable polyester film and heat-shrinkable polyester film roll
  • Heat-shrinkable polyester film and heat-shrinkable polyester film roll
  • Heat-shrinkable polyester film and heat-shrinkable polyester film roll

Examples

Experimental program
Comparison scheme
Effect test

Synthetic example 1

[0256] 100 mol% of dimethyl terephthalate is used as polycarboxylic acids, and 100 mol% of ethylene glycol, which is 2.2 times (molar ratio) relative to polycarboxylic acids, is used as polyhydric alcohols, and is added to the esterification reaction tank, while adding As a catalyst, 0.04 mol% of antimony trioxide with respect to the polycarboxylic acid and 81 ppm of magnesium acetate tetrahydrate with respect to the formed polyester in terms of magnesium atoms were heated to 230°C while stirring, and the ester was carried out under normal pressure. The exchange reaction lasted for 120 minutes, and the end point of the transesterification reaction was defined as the point at which a predetermined amount of methanol was distilled off. After the transesterification reaction was completed, 58 ppm of trimethyl phosphate was added in terms of P atom conversion relative to the formed polyester, and the temperature was raised to 280° C. while depressurizing for 85 minutes, and the pol...

Synthetic example 2～7

[0258] Polyesters B to G shown in Table 1 were synthesized in the same manner as in Synthesis Example 1. In Synthesis Example 2 and Synthesis Example 3, polyesters B and C were obtained using antimony trioxide in which the amount of Sb atoms relative to the polyester was 160 ppm as a polymerization catalyst. On the other hand, in Synthesis Example 4, polyester D was obtained by using tetrabutoxytitanium having 90 ppm of Ti atoms relative to the polyester as a polymerization catalyst. In Synthesis Example 6, polyester F was obtained by using cobalt acetate tetrahydrate having 20 ppm of Mg atoms relative to the polyester and tetrabutoxytitanium having 15 ppm of Ti atoms relative to the polyester as a polymerization catalyst. In Synthesis Example 7, polyester G was obtained using the same polymerization catalyst as in Synthesis Example 1.

[0259] As for the lubricant, 0.7% by mass of silica with an average particle diameter of 1.8 μm (“Sysilia 350” manufactured by Fuji Silysia ...

Synthetic example 8～14

[0278] Polyesters A to G were synthesized in the same manner as in Synthesis Example 1 except that polyester A and polyester E were not blended with silica. The compositions of these polyesters are the same as polyesters A to G in Table 1.

[0279] Experiment 12

[0280] A 3-layer laminated polyester-based film No. 12 consisting of two outer layers and a center layer was produced. In the center layer, each tablet of polyester A, polyester B and polyester D which were pre-dried respectively was mixed in the ratio shown in Table 6, and an ultraviolet ray blocking agent (Ciba Specialty Chemicals Inc. "チヌビン (registered trademark) 326" manufactured by the U.S. Co., Ltd. Co., Ltd. Co., Ltd. Co., Ltd. Co., Ltd. Co., Ltd. Co., Ltd. Co., Ltd.) Co., Ltd.) made the ultraviolet blocking agent account for 1% by mass in the total of 100% by mass of the mixed polyester and the ultraviolet blocking agent. In addition, the two outer layers also use a mixture of mixed polyester and UV blockin...

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Abstract

A heat-shrinkable polyester-based film, characterized in that it exhibits a heat-shrinking percentages in (A) a warm water of 70 DEG C and (B) warm water of 85 DEG C of (A) 10 to 50 % in the maximum shrinkage direction and (B) 75 % or more in the maximum shrinkage direction and 10 % or less in the direction orthogonal to the maximum shrinkage direction, (C) the difference in heat-shrinking percentages DeltaX (%) representing X0 - X10 is 10 to 20 %, wherein X0 (%) represents the heat-shrinking percentage in the maximum shrinkage direction in a warm water of 95 DEG C and X10 (%) represents the heat-shrinking percentage of a film having been heat-shrunk by 10 % in the maximum shrinkage direction in a warm water of 95 DEG C, (D) the three-dimensional surface roughness SDeltaa of 0.008 to 0.04 and (E) the three-dimensional surface roughness SRz of 0.6 to 1.5 mum. The heat-shrinkable polyester-based film exhibits good accomplishment of shrinkage, the reinforcement function for the resulting shrink-coated container and good resistance to blocking and is also excellent in workability in film making and processability, even when it is used for full labeling. Further, the present invention provides a heat-shrinkable polyester-based film capable of absorbing ultraviolet rays and a heat-shrinkable polyester-based film roll which exhibits uniform heat-shrinking characteristics over the whole of a long film.

Description

technical field [0001] The present invention relates to a heat-shrinkable polyester film suitable for label use and a film roll obtained by winding a long heat-shrinkable polyester film. The heat-shrinkable polyester film of the present invention has excellent heat shrinkage characteristics. In addition, the heat-shrinkable polyester film wound into a film roll in the present invention rarely causes defects in the production process of labels and bags, and rarely causes insufficient shrinkage, uneven shrinkage, and whitening in the shrinking process. , Wrinkles, deformation, longitudinal shrinkage (タテヒケ) and other undesirable phenomena. Background technique [0002] In the past, heat-shrinkable polyester films (hereinafter sometimes simply referred to as "films") have been used to shrink by heat, such as polyethylene terephthalate (PET) containers, polyethylene containers, glass containers, etc. Targeting various containers, this film is widely used in shrink (stack) packa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L67/00
Inventor 伊藤秀树多保田规小田尚伸
Owner TOYOBO CO LTD
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