C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/239
C08G 69/26 (2006.01)
Patent
CA 1127797
-1- Case 3-12079/ZFO/+ Transparent copolyamides, processes for producing them, and the use thereof for the production of moulded articles Abstract of the Disclosure There are described transparent copolyamides which are obtained by reaction of a mixture A) consisting of essentially stoichiometric amounts of a diamine of the formula Image (I) and isophthalic acid, a mixture of isophthalic acid and terephthalic acid, or amide-forming derivatives thereof, in a molar ratio isophthalic acid(derivative) : terephthalic acid(derivative) of 5:5 to 10:0, with a mixture B) consisting of essentially stoichiometric amounts of a diamine of the formula Image ( II) and a dicarboxylic acid of the formula HOOC-Z-COOH (III), or an amide-forming derivative thereof [R1 to R4 independently of each other are each H or C1-4-alkyl, the proportion of mixture A) is 40-60 per cent by weight, and - 2 - R5 and R6 independently of one another are each cycloalkyl which has 5-12 ring C atoms and which is unsubstituted or is substituted by C1-4-alkyl, or they are each isopropyl, sec-butyl or isobutyl ; or the proportion of mixture A) is 50-70 per cent by weight, R5/R6 = -CH(R7)(R8), R7 is H or C2-8-alkyl, R8 is C2-8-alkyl, and Z is C4-14- alkylenel. The novel copolyamides are distinguished by good thermoplastic processing characteristics, low water absorption, and good stability to hydrolysis, and they are suitable for producing transparent moulded articles.
337698
Ciba Specialty Chemicals Holding Inc.
Fetherstonhaugh & Co.
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