BE581249A - - Google Patents

Description

       

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The present invention relates to high molecular weight polycarbonates and relates to more

  
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aromatic diols and aliphatic diols, mainly primary diols. It particularly concerns

  
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and aliphatic diols.

  
According to the invention, polycarbona-

  
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ae 5 to 35.

  
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the unfulfilled valences being satisfied by the

  
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particularly happy and the resulting products are particularly golden - ': heavens.

  
It only takes small amounts of phosg &#65533; ne

  
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having alternating residues of Bisphenol A and ethylene glycol is chain-extended with a small amount of phosgene in the presence of a base to give a polycarbo-

  
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taking in the liquid agent an inert organic solvent.

  
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moles of aromatic diol per mole of bishaloformate we arrive at products which polymerize more effectively on phosgenation. Any unreacted aromatic diol can if desired be removed prior to polymerization by taking advantage of its water solubility in aqueous alkaline solutions.

  
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So except for the economic and handling advantages, any temperature is suitable provided it

  
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advisable to avoid unwanted volatilization

  
of the solvent and / or closed reaction devices as well as the solidification of the reaction agent. Temperatures are chosen according to these considerations.

  
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res from 0 to 40 [deg.] C.

  
The reaction itself requires two equivalents

  
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For various reasons, 2.1 to 4.0 moles of sodium hyuroxide or the like are ordinarily used. because mole of

  
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of stirred polycarbonate and aqueous solution of inorganic alkali for example sodium hydroxide. It has also just added an insoluble organic solvent

  
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without which both the original polycarbonate and the polycarbonate constituting the product are soluble. Of

  
 <EMI ID = 29.1> glycol in quantity ae 1.1 sole at a m &#65533; lan'e sheltered from 1.0

  
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which result are produced with ': polycarbonates

  
no

  
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cyclohexane.

  
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It is possible to produce polycarbonates

  
extended chain as considered here by the simul-

  
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do while carefully controlling the conditions and rates of the reagents.

  
The K values in question here were obtained by weighing 0.2500 g of polycarbonate in a [pound] 'la- <EMI ID = 39.1>


    

Claims (1)

<EMI ID = 40.1> diphenol. <EMI ID = 41.1> primary aliphatic diol residues. 4. A process for the preparation of a high molecular weight linear polycarbonate having counter structure. <EMI ID = 42.1> and aliphatic iols linked together by carbonate groups, the regularity of the repeating structure <EMI ID = 43.1> solution in an organic solvent. 7. A method according to any of the claims <EMI ID = 44.1>