Analogy process for preparing 26,26,26,27,27,27hexafluoro- 1alpha, 25-dihydroxycholecalciferols and 26,26,26,27,27,27-hexafluoro-1alpha, 3beta, 25-trihydroxycholest-5,7-diene for use as starting material in the process

摘要

The invention relates to composite packing films shrinkable by deep drawing and consisting of at least one copolyamide layer containing at least 50% by weight of epsilon -caprolactam units and at least one heat-sealable layer, and optionally, an adhesion-promoting layer.