| 摘要 |
A normally solid, transparent, amorphous polyamide having: first diamine-derived primary structural units of the formula <IMAGE> wherein each A is individually selected from the group consisting of 5-methylnonamethylene, 2,4-dimethyloctamethylene, 2,4,6-trimethylheptamethylene and 4-isopropylheptamethylene; second diamine-derived primary structural units of the formula <IMAGE> wherein each R is individually selected from the group consisting of hydrogen and methyl; first diacid-derived primary structural units of the formula <IMAGE> and second diacid-derived primary structural units of the formula <IMAGE> and process of preparation thereof. Other diamine-derived structural units and/or diacid-derived structural units can be present in small amounts.
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