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Polyester resin aqueous dispersion, coating film obtained from same, and packaging bag using such coating film

A technology of water-based dispersion and polyester resin, which is applied in transportation, packaging, thin material processing, etc. It can solve the problems of poor low-temperature heat-sealing performance, poor film-forming performance, and low adhesion, and achieve excellent low-temperature heat-sealing performance and utilization The effect of high value and excellent blocking resistance

Inactive Publication Date: 2008-09-03
UNITIKA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Specifically, for example, when the laminated film formation is placed in a high-temperature atmosphere of about 38°C, clogging occurs and it is difficult to peel off.
In this way, it is difficult to balance low-temperature film formation and blocking resistance
In addition, when overlapping and heat-sealing the film-forming surfaces of the substrates in contact, it is necessary to heat-melt them depending on the substrate. When selecting an aqueous polyester resin dispersion to obtain a film with blocking resistance, Not only the above-mentioned low-temperature film-forming property is poor, but also the low-temperature heat-sealing property is also poor
When the low-temperature heat-sealability is poor, the heat-melting temperature is, for example, about 130°C. At a low temperature, the adhesive force is low due to insufficient melting, and the desired adhesiveness cannot be obtained.

Method used

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  • Polyester resin aqueous dispersion, coating film obtained from same, and packaging bag using such coating film
  • Polyester resin aqueous dispersion, coating film obtained from same, and packaging bag using such coating film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0076] The present invention will be specifically described by way of examples below.

[0077] (1) Composition of polyester resin

[0078] It was obtained by 1H-NMR analysis (manufactured by Barian Corporation, 300 MHz). In addition, for resins containing constituent monomers for which no assignable and quantifiable peaks were seen in the 1H-NMR spectrum, methanolysis was carried out at 230° C. for 3 hours in a sealed tube, and then subjected to gas chromatographic analysis for quantitative analysis.

[0079] (2) Number average molecular weight of polyester resin

[0080] The number average molecular weight was determined by GPC analysis (Shimadzu liquid delivery unit LV-10ADvp and ultraviolet-visible spectrophotometer SPD-6AV, detection wavelength: 254 nm, solvent: tetrahydrofuran, polystyrene conversion).

[0081] (3) Glass transition temperature of polyester resin

[0082] Using 10 mg of polyester resin as a sample, it was measured using a DSC (differential scanning calo...

manufacture example

[0114] A mixture containing 1,911 g of terephthalic acid, 1,911 g of isophthalic acid, 292 g of adipic acid, 1,210 g of ethylene glycol, and 1,484 g of neopentyl glycol was heated in an autoclave at 240° C. for 4 hours to perform an esterification reaction. Next, 3.3 g of zinc acetate dihydrate was added as a catalyst, the temperature of the system was raised to 265° C., and the pressure of the system was gradually reduced to 13 Pa after 1.5 hours. The polycondensation reaction was continued under this condition, and after 4 hours, the system was brought to normal pressure with nitrogen gas, and the temperature of the system was lowered. After reaching 260° C., 38 g of trimellitic anhydride was added, stirred at 260° C. for 2 hours, and the depolymerization reaction was carried out. Thereafter, the pressure of the system was gradually reduced to reach 13 Pa after 30 minutes, and then degassing was performed for 1 hour. Then, the system was pressurized with nitrogen and extrude...

Embodiment 1

[0132] (Manufacture of polyester resin aqueous dispersion E-1)

[0133] 300 g of polyester resin P-1, 180 g of isopropanol, and 10 g of triethylamine were mixed using a stirrer with a jacketed 2-liter glass container that could be sealed (manufactured by Tokukikika Kogyo Co., Ltd., T.K. Robomix). . 510 g of distilled water was put into a glass container, and the stirring blade (homogenizer) was stirred at a rotational speed of 7000 rpm. Next, pass hot water into the jacket to heat, keep the temperature of the system at 73-75° C., and stir for 60 minutes. Thereafter, cold water was passed through the jacket, and the rotation speed was reduced to 5000 rpm to stir while cooling to room temperature (about 25° C.), and filtered with a 300-mesh stainless steel filter to obtain a polyester having an organic solvent content of more than 3% by mass. Aqueous resin dispersion. The dispersion is milky white and homogeneous.

[0134] Next, put 500 g of the polyester resin aqueous disper...

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Abstract

The invention provides a polyester resin aqueous dispersion, a coating film made by removing the polyester resin aqueous medium and a packing bag made by thermal melting of the coating film. The polyester resin aqueous dispersion is characterized by containing a polyester resin (A) having a number average molecular weight of not less than 5000 and a glass transition temperature of not less than 50 DEG C and a polyester resin (B) having a number average molecular weight of not less than 9000 and a glass transition temperature of not more than 30 DEG C at a mass ratio (A):(B) of 80 / 20-20 / 80. This polyester resin aqueous dispersion is capable of forming a resin coating film having excellent blocking resistance and adhesion without suffering from cracking even when the film is formed at low temperatures. In addition, the polyester resin aqueous dispersion is capable of forming a resin coating film having excellent adhesion even when it is heat-sealed at low temperatures. Also disclosed are a coating film obtained by removing a polyester resin aqueous medium, and a packaging bag obtained by thermally fusion-bonding such a coating film.

Description

technical field [0001] The present invention relates to an aqueous polyester resin dispersion containing two types of polyester resins in a specific ratio, a coating obtained therefrom, and a packaging bag using the coating. Background technique [0002] Polyester resins are used as resins for coatings and inks because of their excellent coating processability, resistance to organic solvents (solvent resistance), weather resistance, and adhesion to various substrates. Adhesive components in fields such as adhesives, adhesives, and coating agents are widely used. [0003] In particular, in recent years, the use of organic solvents tends to be limited from the standpoint of environmental protection, resource conservation, restrictions on hazardous substances stipulated by the Fire Protection Act, and improvement of the working environment. As polyester resins that can be used in the above applications As an adhesive, the development of an aqueous polyester resin dispersion in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/00
CPCC08J5/18C08J2367/00C08L67/00C08L2201/50Y10T428/1334C08L2666/18
Inventor 武居雅美子
Owner UNITIKA LTD
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