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Compositions for hydrolytic stabilization of polyesters

A compound and stabilization technology, applied in the direction of organic chemistry, can solve the problems of polyester film with long reaction time, unstable extrusion process, difficult to control, etc.

Active Publication Date: 2021-05-14
CLARIANT PLASTICS & COATINGS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these compounds are based on the generation of oxirane rings by means of epichlorohydrin, but show a tendency to cleave low molecular weight toxic compounds, creating similar problems associated with the use of carbodiimides
Furthermore, their incorporation into polyester matrices was insufficient, resulting in long reaction times and oriented polyester films with high haze
[0006] Furthermore, known hydrolysis stabilizers, such as carbodiimides and other substances, such as those described in EP-A-0 292 251, have the disadvantage that they sometimes lead to molecular weight in the polymer during extrusion A sharp increase in (viscosity rise), thus making the extrusion process unstable and difficult to control

Method used

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  • Compositions for hydrolytic stabilization of polyesters
  • Compositions for hydrolytic stabilization of polyesters
  • Compositions for hydrolytic stabilization of polyesters

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] A three-layer film with an ABA structure is produced. The composition of core layer B consisted of 53% PET1, 15% PET2, 2% MBHS, 30% MBUV. Outer layer A consists of 67% PET1, 3% MBHS, 30% MBUV. The PET used was pre-dried at 100-170°C. The main extruder was equipped with ~10 mbar vacuum. The coextruder was equipped with ~20mbar vacuum.

[0068] Extrusion temperatures for different regions are shown in Table 1.

[0069] Table 1: Extrusion temperature in °C:

[0070] area 1 area 2 area 3 area 4 area 5 area 6 area 7 area 8 Area 9 100 102 104 / 105 106 120 / 130 210 210 / 215 220 200 / 190

[0071] Molten polymer is discharged from the nozzles of the pulling rolls. The film was stretched 3.0 times in the machine direction and 3.4 times in the transverse direction of stretching. Then, it was thermally cured at 225°C and relaxed by 3% at a temperature of 220-180°C in the transverse direction. The final film thickness was 50 microns.

Embodiment 2

[0072] Embodiment 2 (comparison)

[0073] A three-layer film with an ABA structure is produced. The composition of core layer B consisted of 45% PET1, 25% PET2, 30% MBUV. Outer layer A consists of 70% PET1, 30% MBUV. The PET used was pre-dried at 100-170°C. The main extruder was equipped with ~10 mbar vacuum. The coextruder was equipped with ~20mbar vacuum.

[0074] Extrusion temperatures for different regions are shown in Table 2.

[0075] Table 2: Extrusion temperature in °C:

[0076] area 1 area 2 area 3 area 4 area 5 area 6 area 7 area 8 Area 9 100 102 104 / 105 106 120 / 130 210 210 / 215 220 200 / 190

[0077] Molten polymer is discharged from the nozzles of the pulling rolls. The film was stretched 3.0 times in the machine direction and 3.4 times in the transverse direction of stretching. Then, it was thermally cured at 225°C and relaxed by 3% at a temperature of 220-180°C in the transverse direction. The final film thickness wa...

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Abstract

The present invention relates to the use of at least one compound of formula (1) as a hydrolysis stabilizer in polyester materials, wherein R 1 and R 2 same or different and means C 1 -C 10 -alkyl.

Description

technical field [0001] The present invention relates to hydrolysis-resistant polyester films. Background technique [0002] Polyester films are well known. However, a disadvantage of unstabilized polyester films is their susceptibility to hydrolysis, especially at temperatures above the glass transition temperature of the particular polyester. Susceptibility to hydrolysis is the property of polyesters to hydrolytically degrade under humid conditions, which can be seen, for example, in a decrease in IV value. This is a limiting factor for the use of polyester films, especially in applications with high temperature stress, such as in film capacitors, cable jackets, flat cables, motor protection films, battery films, floor films, window films, photovoltaic backsheets , and in long-term applications such as in glazing and outdoor applications. [0003] A particularly pronounced susceptibility to hydrolysis is observed in aliphatic polyesters, but also with aromatic polyesters...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K5/12C08J3/22C08J5/18C08L67/02C08L67/04
CPCC08J3/226C08J5/18C08J2367/00C08K5/12C08L67/02C08L67/04C08J3/22C07C69/82C08J2367/02C08J2467/02C08J2469/00C08K5/3492C08K2201/014C08L2201/08C08L2203/16C08L2205/025C08L2205/035C08L2310/00
Inventor K-A·沃蒂格
Owner CLARIANT PLASTICS & COATINGS LTD