POLYMER FILM CONTAINING COPOLYAMIDE OF AT LEAST ONE DIAMINE, ONE DICARBOXYLIC ACID AND ONE DIMERIC ACID Russian patent published in 2022 - IPC C08G69/14 C08G69/34 C08G69/36 B32B27/34 

FIELD: chemistry.

SUBSTANCE: present invention relates to polymer film (P) containing at least one copolyamide, used as technical or packaging film. Copolyamide is obtained by polymerization of the first mixture of monomers (M1) and the second mixture of monomers (M2). The first mixture of monomers (M1) contains at least one dicarboxylic acid with 4-12 carbon atoms and at least one first diamine with 4-12 carbon atoms. The second mixture of monomers (M2) contains at least one dimeric acid with 32-40 carbon atoms and at least one second diamine with 4-12 carbon atoms. Characteristic viscosity of at least one copolyamide is from 120 to 300 ml/g. A method for the production of polymer film (P) includes provision of at least one copolyamide, extrusion of at least one copolyamide in a molten state to obtain film, cooling of the resulting film.

EFFECT: resulting polymer film (P) has high resistance to continued rupture, high transparency, and impact viscosity at a low temperature, has a reduced elasticity module and high resistance to piercing in a dry state, as well as is suitable for using at relatively high temperatures, for example in the range from 200 to 260°C.

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