Instructions: In this task, you are to Translate German text to English
Input: Copolymerisate, die K-Werte von 10 bis 80 haben (bestimmt nach Fikentscher in Dimethylformamid bei 25°C und einer Polymerkonzentration von 2 Gew.
Output:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Copolymerizates having K-values between 10 and 80 (determined by the Fikentscher method in dimethylformamide at 25°C and a polymer concentration of 2 wt.