Transparent copolyamides, processes for producing them, and...

Details Transparent copolyamides, processes for producing them, and... Transparent copolyamides, processes for producing them, and...

C - Chemistry, Metallurgy

08

G

402/239

C08G 69/26 (2006.01)

Patent

CA 1129589

- 1 - Case 3-12078/ZFO/+ Transparent copolyamides, processes for producing them, and moulded articles thereof Abstract of the Disclosure There are described transparent copolyamides which consist of recurring structural elements of the formula I Image (I) and II Image (II) wherein R1 to R4 independently of one another are each hydrogen or alkyl having 1-4 C atoms, R5 ard R6 indepen- dently of one another are each ethyl, n-propyl, isobutyl, -CH(R7)(R8) or- CH2CH(R9)(R10), R7 is alkyl having 1-8 C atoms, R8 is alkyl having 1-4 C atoms, R9 is hydrogen or alkyl having 1-4 C atoms, and R10 is alkyl having 2-8 C atoms, and wherein the proportion of structural elements (I) where R5/R6 ? -CH2CH(R9)(R10) is 10-40 per cent by weight, and where R5/R6 = -CH2CH(R9)(R10) it is 35-55 per - 2 - cent by weight, relative to the total weight of the polymer. The novel copolyamides are characterised by good thermoplastic processing characteristics, low water absorption, good stability to hydrolysis, and negligible dependence of the mechanical and electrical properties on the surrounding humidity, and are suitable for producing transparent moulded articles.

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