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Catalysts for polyester production, process for producing polyester, and polyester

A technology of catalyst and polyester, which is applied in the field of polyester, specifically in the field of polyester, can solve the problems of poor activity, yellow color of product polyester, and unrealized practical application.

Inactive Publication Date: 2003-01-01
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, conventional titanium compound catalysts are less active than antimony or germanium compounds when used as polycondensation catalysts
The product polyester has a problem of conspicuous yellowing in color, so its practical application is still not realized

Method used

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  • Catalysts for polyester production, process for producing polyester, and polyester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0218] Preparation of Solid Titanium Compounds

[0219] 500 ml of deionized water was weighed into a 1,000 ml glass beaker and cooled in an ice bath, then 5 g of titanium tetrachloride was added dropwise while stirring. When the generation of hydrogen chloride stopped, the beaker was taken out from the ice bath, and 25% ammonia water was added dropwise while stirring at room temperature to adjust the pH value of the liquid to 9. A 15% aqueous acetic acid solution was added dropwise to the liquid with stirring at room temperature to adjust the pH of the liquid to 5. The precipitate formed was isolated by filtration. The precipitate was washed 5 times with deionized water. After washing, the precipitate was immersed in 10% by weight of ethylene glycol-containing water for 30 minutes, and then solid-liquid separation was performed by filtration similar to washing. After washing, the resulting titanium compound was vacuum-dried at 40° C. and 1.3 kPa (10 Torr) for 20 hours to ...

Embodiment 2

[0223] Preparation of Solid Titanium Compounds

[0224] 500 ml of deionized water was weighed into a 1,000 ml glass beaker and cooled in an ice bath, then 5 g of titanium tetrachloride was added dropwise while stirring. When the generation of hydrogen chloride stopped, the beaker was taken out from the ice bath, and 25% ammonia water was added dropwise while stirring at room temperature to adjust the pH value of the liquid to 9. A 15% aqueous acetic acid solution was added dropwise to the liquid with stirring at room temperature to adjust the pH of the liquid to 5. The precipitate formed was isolated by filtration. The precipitate was washed 5 times with deionized water. After washing, the precipitate was immersed in 30% by weight of ethylene glycol-containing water for 30 minutes, and then solid-liquid separation was performed by filtration similar to washing. After washing, the resulting titanium compound was vacuum-dried at 40° C. and 1.3 kPa (10 Torr) for 40 hours to ...

Embodiment 3

[0228] Preparation of Solid Titanium Compounds

[0229] 500 ml of deionized water was weighed into a 1,000 ml glass beaker and cooled in an ice bath, then 5 g of titanium tetrachloride was added dropwise while stirring. When the generation of hydrogen chloride stopped, the beaker was taken out from the ice bath, and 25% ammonia water was added dropwise while stirring at room temperature to adjust the pH value of the liquid to 9. A 15% aqueous acetic acid solution was added dropwise to the liquid with stirring at room temperature to adjust the pH of the liquid to 5. The precipitate formed was isolated by filtration. The precipitate was washed 5 times with deionized water. After washing, the precipitate was immersed in 50% by weight of water containing ethylene glycol for 30 minutes, and then solid-liquid separation was performed by filtration similar to washing. After washing, the resulting titanium compound was vacuum-dried at 40° C. and 1.3 kPa (10 Torr) for 150 hours to...

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Abstract

A catalyst for polyester production which comprises a solid titanium compound comprising titanium, oxygen, carbon, and hydrogen and having a Ti-O bond and which, when dissolved in ethylene glycol with heating at 150 DEG C, has a solubility in the ethylene glycol of at least 3,000 ppm in terms of titanium atom amount; a catalyst for polyester production which comprises a titanium-containing solution obtained by dissolving a product obtained by contacting a polyhydric alcohol with a hydrolyzate of a titanium halide or titanium alkoxide, in ethylene glycol in an amount of 3,000 to 100,000 ppm in terms of titanium atom amount; a process for producing a polyester with any of these catalysts; and a polyester produced by this process. According to the present invention, a polyester can be prepared with a higher catalytic activity as compared with a case of using a conventional catalyst, and a polyester having better transparency, better hue and lower acetaldehyde content can be obtained as compared with a process using an antimony compound as a polycondensation catalyst.

Description

technical field [0001] The present invention relates to catalysts for preparing polyesters, methods for preparing polyesters using the catalysts, and polyesters made using the catalysts. More specifically, the present invention relates to a catalyst capable of polycondensing a dicarboxylic acid and a dihydric alcohol to produce a polyester with excellent catalytic activity, a method for producing a polyester using the catalyst, and a specific polyester produced using the catalyst . Background technique [0002] Polyesters such as polyethylene terephthalate have good mechanical strength, heat resistance, transparency, and gas barrier properties, and they are suitable as beverage container materials such as fruit juices, soft drinks, and carbonated drinks, as well as films, sheets, fibers and other materials. [0003] Such polyesters are generally produced from dicarboxylic acids such as terephthalic acid and glycols such as ethylene glycol. More specifically, oligomers (es...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/183C08G63/82C08G63/85
CPCC08G63/85C08G63/183C08G63/82
Inventor 堀秀史江原不二人清水昭义向展正平冈章二
Owner MITSUI CHEM INC
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