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Flame-retardant polyester and process for producing the same

A flame-retardant polyester technology, applied in the field of flame-retardant polyester, can solve the problems of increased yellow coloration of polymers, unusable high whiteness, and poor productivity, achieving good hue, high industrial value, and mechanical Excellent effect

Active Publication Date: 2007-10-31
TOYOBO CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, although the polymerization rate can be improved, the thermal stability of the polymer is deteriorated due to the use of a titanium catalyst, and the yellow coloration of the polymer after molding is increased in particular.
As a result, although the hue of the polymer can be improved to some extent, the improvement of whiteness itself cannot be achieved, and there is a problem that it cannot be used for applications requiring high whiteness.
In addition, there is a problem of poor hydrolysis resistance of polyester due to phosphorus atoms entering the polymer backbone
[0010] As a method to solve such problems, phosphorus atoms are incorporated into polymer side chains (for example, refer to Patent Document 7), but if the amount of phosphorus compounds is increased in order to impart a higher degree of flame retardancy, the polymerization time is greatly increased, and there are As a result, problems in which productivity significantly deteriorates

Method used

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  • Flame-retardant polyester and process for producing the same
  • Flame-retardant polyester and process for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0108] A stainless steel autoclave equipped with a stirrer, a distillation tower, and a pressure regulator (all the equipment used in the following experiments) was charged with 825 parts of terephthalic acid, 4 parts of trimellitic acid, and 1006 parts of phosphorus compound (i) (As a 50% ethylene glycol solution) and 297 parts of ethylene glycol, then add 0.324 parts of germanium dioxide and 2.1 parts of triethylamine, at 245℃, gauge pressure 2.5kg / cm 2 The esterification reaction was carried out for 2 hours while successively removing the water produced by the esterification. Next, the temperature of the system was increased to 280°C over 1 hour, and during this time, the pressure of the system was gradually reduced to reach 0.1 mmHg, and the polycondensation reaction was carried out for 105 minutes under these conditions. The phosphorus content of the obtained polymer was 30000 ppm, which showed good flame retardancy. In addition, even with high concentrations of phosphorus, t...

Embodiment 2

[0110] A stainless steel autoclave equipped with a stirrer, a distillation tower, and a pressure regulator (all the equipment used in the following experiments) was charged with 825 parts of terephthalic acid, 4 parts of trimellitic acid, and 1006 parts of phosphorus compound (i) (As a 50% ethylene glycol solution) and 297 parts of ethylene glycol, then add 0.324 parts of germanium dioxide and 2.1 parts of triethylamine, at 245℃, gauge pressure 2.5kg / cm 2The esterification reaction was carried out for 2 hours while successively removing the water produced by the esterification. Next, the temperature of the system was increased to 280°C over 1 hour, and during this time, the pressure of the system was gradually reduced to reach 0.1 mmHg, and the polycondensation reaction was carried out for 105 minutes under these conditions. The phosphorus content of the obtained polymer was 30000 ppm, which showed good flame retardancy. In addition, even with high concentrations of phosphorus, th...

Embodiment 3

[0112] 821 parts of terephthalic acid, 7 parts of trimellitic acid, 1005 parts of phosphorus compound (i) (as a 50% ethylene glycol solution), and 296 parts of ethylene glycol are charged, and 0.324 parts of germanium dioxide and three are added. 2.1 parts of ethylamine, at 245℃, gauge pressure 2.5kg / cm 2 The esterification reaction was carried out for 2 hours while successively removing the water produced by the esterification. Next, the temperature of the system was increased to 280°C over 1 hour, and during this time the pressure of the system was gradually reduced to 0.1 mmHg, and the polycondensation reaction was carried out for 105 minutes under these conditions. The phosphorus content of the obtained polymer was 30000 ppm, which showed good flame retardancy. In addition, even with high concentration of phosphorus, the intrinsic viscosity is as high as 0.89dl / g. That is, it means that the polymerization speed is fast. The melt viscosity of the polymer is 16780 dPa·s, and the...

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Abstract

The invention relates to easily obtain a polyester having excellent mechanical properties, a satisfactory hue, and a high degree of flame retardancy. The flame-retardant polyester is a polyester comprising ethylene terephthalate units as the main structural units and a phosphorus compound copolymerized or incorporated therein or is a resin composition comprising polyesters including that polyester. The flame-retardant polyester is characterized in that a polycarboxylic acid and / or polyol having three or more functional groups capable of forming an ester bond is contained in the polyester in a total amount of 0.05-2.00 mol (per 200 mol of the sum of the dicarboxylic acid ingredient and the diol ingredient), that a specific phosphorus compound having a functional group capable of forming an ester bond is contained in the polyester in an amount of 5,000-50,000 ppm of the polyester in terms of phosphorus amount, and that the polyester pellet obtained has a b value of -5 to 20, an L value of 35 or larger, and a melt viscosity at 280 DEG C of 1,000-20,000 dPas.

Description

Technical field [0001] The present invention relates to flame-retardant polyester and its manufacturing method. More specifically, it relates to a flame-retardant polyester containing 5,000 to 50,000 ppm of phosphorus-containing materials. Flame retardancy can be imparted to the polyester of the present invention, and extrusion molding, injection molding, etc. can be used for fibers for clothing, fibers for industrial materials, films, engineering plastics, adhesives, and the like. Background technique [0002] So far, polyester has been widely used in various molded products such as fibers, films, and bottles by taking advantage of its excellent chemical and physical properties. However, polyesters, especially polyethylene terephthalate, are insufficient in flame retardancy, and various studies have been conducted for improvement in this aspect, and the addition of phosphorus compounds has been proposed as a method of flame retardation. [0003] For example, a method of mixing a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/692C08K5/5313C08L67/02
CPCC08G63/863C08G63/6926C08K5/5313C08L67/02C08K5/53
Inventor 渊上正树纐缬将司厚地哲守佐藤万纪
Owner TOYOBO CO LTD
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