Copolymer polyester resin and molded product using same

A polyester resin and copolymer technology, applied in the field of copolymer polyester resin, can solve the problems of reducing shrinkage stress, poor low-temperature shrinkage, etc., and achieve the effects of reducing shrinkage stress, high shrinkage rate, and reducing molding defects

Active Publication Date: 2011-10-26
SK CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Therefore, the present invention is intended to solve the problems encountered in the related art, and is used to provide a copolymer polyester resin that can compensate for poor low-temperature shrinkage and can reduce shrinkage stress while maintaining a high shrinkage rate. The present invention also provides Provided is a heat shrinkable film comprising the copolymer polyester resin

Method used

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  • Copolymer polyester resin and molded product using same
  • Copolymer polyester resin and molded product using same
  • Copolymer polyester resin and molded product using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0048] The present invention can be better understood through the following illustrative examples and comparative examples, which are illustrative and not limiting to the present invention.

[0049] Property measurements were performed in Examples and Comparative Examples according to the following methods.

[0050] ◎Glass transition temperature (Tg): Tg was measured using a differential scanning calorimeter purchased from TA Instruments.

[0051] ◎Heat shrinkage rate: cut a sample into a square with a size of 10 cm × 10 cm, and soak it in warm water for 10 seconds at the temperature shown in Table 1 below under no-load conditions to make it heat shrink, and then Soak in water at 25°C for 10 seconds, then measure the longitudinal and transverse lengths of the sample, and then substitute them into the following formula.

[0052] Thermal shrinkage rate (%) = 100 x (length before shrinkage - length after shrinkage) / (length before shrinkage)

[0053] ◎Solution resistivity (Ωcm...

Embodiment 1

[0060] To prepare the copolymer polyester resin, based on 6 moles of terephthalic acid, 183 g of 1,4-cyclohexanedimethanol, 511 g of ethylene glycol and 183 g of 2-methyl-1,3-propanediol were added to a stirring In a 3-liter reactor with a discharge condenser and a discharge condenser, mixing was carried out, and the reaction was carried out while gradually raising the temperature therein to 255°C.

[0061] Thereby, the generated water is discharged to the outside, thereby performing esterification. After the completion of water generation and discharge, the obtained esterified product was transferred to a polycondensation reactor equipped with a stirrer, a condenser and a vacuum system.

[0062] 0.5 g of tetrabutyl titanate, 0.4 g of triethyl phosphate and 0.5 g of cobalt acetate were added to the esterified product. While the internal temperature of the reactor was raised from 240°C to 275°C, ethylene glycol was removed in a low vacuum atmosphere of 50 mmHg, which was reduc...

Embodiment 2

[0065] A copolymer polyester resin was prepared in the same manner as in Example 1 except that 250 g of 2-methyl-1,3-propanediol was added. Then a heat-shrinkable film was prepared using the resin, and the glass transition temperature, shrinkage initiation temperature, heat shrinkage rate, melt resistivity, and shrinkage stress of the heat-shrinkable film were measured. The results are shown in Table 1 below.

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Abstract

The present invention relates to a copolymer polyester resin and a molded product using the same and more specifically to a copolymer polyester resin that contains 10-80 mol% of 1,4-cyclohexane dimethanol, 0.1-50 mol% of a diol compound expressed as HO-R6CR7-R4R1R5-COHR2R3 (where R1 is an alkyl group with a carbon number of 0-10,and R2-R7 are hydrogens or alkyl groups with a carbon number of 1-10), and ethylene glycol as the remainder so that the sum of the entire diol composition is 100 mol% relative to aromatic dicarboxylic acid. The copolymer polyester resin of the present invention enables reduction of cycle time and improvement of product moldability and prevention of PET bottle deformation during mold processing with a heat-shrinking label by complementing low temperature shrinkage, maintaining a high shrinkage rate, and reducing shrinkage stress.

Description

technical field [0001] The present invention relates to a copolymer polyester resin and molded products using the copolymer polyester resin. Cycle time and improved molding properties of products, thus being very suitable for labels, the present invention also relates to molded products using said copolymer polyester resin. Background technique [0002] Heat-shrinkable plastic products have the property of shrinking by heat, and are very widely used in films such as shrink wraps, shrink labels, and the like. Specifically, plastic films based on polyvinyl chloride (PVC), polystyrene and polyester are used for labeling or capping various containers, or directly for packaging. [0003] However, a film made of PVC may generate hydrogen chloride gas and dioxin-generating materials when incinerated, and thus is restricted in terms of environmental protection. If this product is used as a shrink label for PET containers, the container can only be recycled after the label has been...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/16C08G63/18C08G63/42C08J5/00B29C48/305
CPCC08G63/199C08G63/16C08G63/18C08G63/42C08J5/00
Inventor 李明烈金钟亮
Owner SK CHEM CO LTD
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