申请人:Ciba-Geigy Corporation
公开号:US04210742A1
公开(公告)日:1980-07-01
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.degree. C.) and consist either of (a) recurring structural units of the formula (I) ##STR1## wherein the carbonyl groups are in the 1,3- or 1,4-position to one another (the proportion of carbonyl groups in the 1,3-position being 30 to 100%) and each of R.sub.1 and R.sub.2 is methyl or R.sub.1 and R.sub.2 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) ##STR2## wherein the carbonyl groups are in the 1,3- or 1,4-position to one another (the proportion of carbonyl groups in the 1,3-position being 30 to 50%) and R.sub.3 and R.sub.4 are alkyl, or of (c) recurring structural units of the formula (V) ##STR3## 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 R.sub.5 and R.sub.6 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.
本发明的透明聚酰胺具有至少0.4 dl/g的降低比粘度(在25℃下,将聚酰胺以0.5%的浓度在甲基苯中溶解),并且由以下结构单元之一组成:(a)式(I)的重复结构单元
其中,羰基基团在彼此的1,3-或1,4-位置上(1,3-位置的羰基基团的比例为30%至100%),且R1和R2中的每一个均为甲基,或者R1和R2与它们附着的碳原子一起是含有4至6个碳原子的环烷基;(b)式(II)的重复结构单元
其中,羰基基团在彼此的1,3-或1,4-位置上(1,3-位置的羰基基团的比例为30%至50%),且R3和R4是烷基;(c)式(V)的重复结构单元
其中,羰基基团要么仅在彼此的1,3-位置上,要么仅在彼此的1,4-位置上,或在部分为1,3-位置和部分为1,4-位置,且R5和R6与它们附着的碳原子一起是含有7至12个碳原子的环烷基。这些聚酰胺适用于生产透明的模制品。