Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1979-10-09
1981-10-27
Anderson, Harold D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528338, 528339, 528340, 528347, 528349, C08G 6926
Patent
active
042974801
ABSTRACT:
There are described transparent polyamides, and processes for producing them, which polyamides consist of recurring structural elements of the formula I ##STR1## or of recurring structural elements of the formula II ##STR2## [carbonyl groups in the structural elements (II) bound in the 1,3- and/or 1,4-position to the benzene nucleus, R.sub.1 =C.sub.1-12 -alkyl, R.sub.2 =H, C.sub.1-12 -alkyl, R.sub.3 =C.sub.1-12 -alkyl, C.sub.4-12 -cycloalkyl, C.sub.7-8 -aralkyl, unsubstituted or substituted aryl, R.sub.4 =H, C.sub.1-12 -alkyl, C.sub.4-12 -cycloalkyl, C.sub.7-8 -aralkyl, or unsubstituted or substituted aryl, or R.sub.3 /R.sub.4 together=C.sub.3-11 -alkylene, R.sub.5 /R.sub.6 independently of one another=hydrogen or methyl, and R.sub.7 /R.sub.8 together=C.sub.3-11 -alkylene]. The polyamides according to the invention are suitable for producing transparent moulded articles of the widest variety, and are distinguished in particular by low water absorption, high stability to hydrolysis, and/or good dimensional stability under the action of moisture or humidity.
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Pfeifer Josef
Reinehr Dieter
Anderson Harold D.
Giba-Geigy Corporation
Hall Luther A. R.
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