| abstract |
The material forming the subject of the invention, of the type based on synthetic biodegradable polymers, is characterized in that it comprises a copolymer of N-vinylpyrrolidone and of alkyl esters of acrylic and / or methacrylic acids comprising in the alkyl group 2 to 8 carbon atoms, the viscosity characteristic of said material varying from 0.3 to 0.8 dl / g and the proportions of its components being as follows (% by moles): N-vinylpyrrolidone 40 to 90 , alkyl esters of acids, acrylic and / or methacrylic 10 to 60. |