BE553841A - - Google Patents

Description

       

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high melting and high thermal stability.

  
The present invention therefore provides novel poly- <EMI ID = 2.1> pars by distillation.

  
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tion of the dibasic acid chloride of the aromatic carboxylic acid with hydroquinone, either alone or diluted with an inert solvent, and in an inert atmosphere.

  
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; '- anointed.

  
When the reaction is carried out in a solvent the pro-

  
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low point 0; ' boiling, followed by filtration, or by distillation of the solvent under reduced pressure, if necessary.

  
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highly crystalline material with a softening point

  
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viscous), and are useful for applications which require high melting point plastics. They can

  
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ordinary polymeric materials, e.g. for the manufacture

  
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examples follow-ivsnts in which the parts are by weight. The indicated melting points are determined by the block method

  
 <EMI ID = 10.1> again at 259 [deg.] C cens of nitrogen until reaching a period

  
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below 400 [deg.] C.

  
EXAMPLE 2.- '

  
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grind it, then heat it again in nitrogen for 5 hours

  
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for 20 hours, and we have it. dried.' The product is a solid crystalline polymer melting at about 360 [deg.] C.

  
EXAMPLE 3.-

  
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part of zinc acetate at 259 [deg.] C in a stream of pure nitrogen for 4 hours. Phenyl acetate distilled off and the initial clear melt solidified. This solid material is then ground

  
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mercury for 5 hours. The solid material is then crushed,

  
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the dry. The product is a highly crystalline, light buff colored polymer melting at about 385 [deg.] C.

  
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Theoretical hydrochloric acid. Heating is continued at

  
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rea during which 6.3 parts of hydroquinone separate from the reaction restart by sublimation; we then bring the temperature

  
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for 1 hour. The product, which softens at 360 - 365 [deg.] C, can be stretched into fibers.

  
EXAMPLE 5.-

  
A mixture of 5.86 parts of chloride is heated.

  
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for 1 hour at 320 - 325 [deg.] C, and then for 2 hours at 370 - 400 [deg.] C

  
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at. the other.

  
__2.- New polyesters in particular as described above with special reference to the examples cited.

  
3.- Manufacturing process of the new polyesters following

  
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Claims (1)

<EMI ID = 27.1> 4.- Manufacturing process for new, sui- <EMI ID = 28.1> Hydroquinone. <EMI ID = 29.1> examples cited.