The invention discloses novel polyamide moulding materials which are characterized by a significantly improved processability, in particular in injection-moulding, an acceptable deformation in climatic testing, a very high transparency, low haze and even an increased biobased content. The polyamide moulding materials on the basis of transparent copolyamides for producing transparent moulding parts having a high tenacity, low water absorption and low distorsion in climatic testing contain: (A) 40 to 100 percent by weight of at least one transparent copolyamide with a glass transition temperature (Tg) of at least 80 ° C. and not more than 150 ° C., composed of at least two diamines that are different from each other, selected from a mixture of (a) 50 to 90 mol % bis-(4-amino-3-methylcyclohexyl)methane (MACM) and/or bis-(4-amino-3-ethylcyclohexyl)methane (EACM) and/or bis-(4-amino-3,5-dimethylcyclohexyl)methane (TMACM) and b) 10 to 50 mol% aliphatic diamine having 9 to 14 carbon atoms, in particular decandiamine, particularly preferably at least 20 mol % decandiamine, each relative to the total amount of diamines, and of one or more aliphatic dicarboxylic acids, having in particular 6 to 36 carbon atoms, (B) 0 to 60 percent by weight of at least one further polymer, (C) 0 to 10 percent by weight of usual additives, the sum of the components (A), (B) and (C) totaling 100 percent by weight.