C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/239
C08G 69/26 (2006.01) C08J 5/00 (2006.01)
Patent
CA 1120194
Case 3-11 405/ZFO/+ CANADA TRANSPARENT POLYAMIDES Abstract of the Disclosure The transparent polyamides of the invention have a reduced specific viscosity of at least 0.4 dl/g (0.5 % solution of the polyamide in m-cresol at 25° C) and consist either of a) recurring structural units of the formula (I) Image (I), wherein the carbonyl groups are in the 1,3- or 1,4-position to one another (1.3 to 30 to 100 %) and each of R1 and R2 is methyl or R1 and R2 together with the carbon atom to which they are attached are cycloalkyl of 4 to 6 carbon atoms, or of b) recurring structural units of the formula (II) Image (II), wherein the carbonyl groups are in the 1,3- or 1,4-position to one an- other (1.3 to 30 to 50 %) and R3 and R4 are alkyl, or of c) recurring structural units of the formula (V) Image (V), wherein the carbonyl groups are either exclusively in the 1,3-position or exclusively in the 1,4-position to one another or partly in the 1,3- position and partly in the 1,4-position, and wherein R5 and R6 together with the carbon atom to which they are attached are cycloalkyl of 7 to 12 carbon atoms. The polyamides are suitable for the production of transparent moulded articles.
314683
Peter Heinz
Pfeifer Josef
Ciba Specialty Chemicals Holding Inc.
Fetherstonhaugh & Co.
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