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Process for the preparation of semiaromatic copolyamides using a high excess of diamine

A technology for semi-aromatic polyamide and diamine, which is applied in the field of preparing semi-aromatic copolyamide and can solve the problems of inferring favorable effects and the like

Active Publication Date: 2018-08-07
BASF SE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The beneficial effect of this diamine excess compared to a dibasic acid excess cannot be deduced from the known prior art

Method used

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  • Process for the preparation of semiaromatic copolyamides using a high excess of diamine

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Experimental program
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Effect test

Embodiment

[0172] Polyamides are produced by condensation in the molten state in stirred autoclaves. For this purpose, suitable amounts of terephthalic acid, isophthalic acid and hexamethylenediamine (HMD, 70% in water) were weighed in. The amount of water supplied together with the HMD was 15% by weight, and about 0.03% by weight of sodium hypophosphite was added as a catalyst. For stoichiometric mixtures (excess of hexamethylenediamine: 0 meq / kg), the following amounts are used accordingly:

[0173] 164.753g of terephthalic acid

[0174] 70.608g of isophthalic acid

[0175] 235.198g of hexamethylenediamine (70% aqueous solution)

[0176] 0.13g sodium hypophosphite

[0177] In the experiments in the table below, the amount of hexamethylenediamine was adjusted accordingly according to the specified excess or deficiency (negative values).

[0178] The materials were introduced into a stirred autoclave at room temperature, and the autoclave was purged several times with nitrogen and t...

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Abstract

The present invention relates to a process for the preparation of semiaromatic copolyamides using a high excess of diamine in the reaction mixture.

Description

technical field [0001] The present invention relates to a process for the preparation of semiaromatic copolyamides using a high excess of diamine in the reaction mixture. Background technique [0002] Polyamides are one of the polymers produced on a large scale worldwide and - besides the main fields of use in films, fibers and materials - are also used in many other end uses. An important class of polyamides are the semicrystalline or amorphous thermoplastic semiaromatic polyamides, which are widely used as important industrial plastics. Their particularly notable feature is their high thermal stability and they are also known as high temperature polyamides (HTPA). An important field of application of HTPA is the production of electrical and electronic components, and suitable polymers for soldering operations under lead-free conditions (lead-free soldering) are especially polymers based on polyphthalamide (PPA) . HTPA is used in particular for the production of plug con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/28
CPCC08G69/28
Inventor A·维尔姆斯C·施密特F·里奇特J·克劳斯G·科里S·施威格A·施耐德
Owner BASF SE