HYDROXYL-CONTAINING POLYMER IMPREGNATION METHOD Russian patent published in 2008 - IPC C08J7/12 C08J9/18 C08J7/04 B05D1/40 B05D7/04 B05D3/04 

FIELD: polymer materials.

SUBSTANCE: invention relates to a method for impregnating hydroxyl-containing polymers with functional agents by way of swelling in overcritical fluid, which process is intended for use in medicine, biotechnology, agriculture, food and chemical industries as therapeutic agents, adsorbents, depots for biologically active substances, catalysts, etc. Thus, object of invention was to develop efficient method for impregnating densely packed hydroxyl-containing polymers while preserving high hydrophilicity thereof. The problem was solved by pretreating polymer with a hydrogen bond acceptor selected from group consisting of urea, dichloroacetic acid, trifluoroacetic acid, and guanidinium chloride, and performing swelling in overcritical carbon dioxide at 32 to 100°C and pressure 7.5-25.0 MPa, after which treated polymer undergoes desorption to carbon dioxide level 2-10% and subjected to heat treatment at 80-200°C and atmospheric pressure to form cellular plastic, which is impregnated with functional agents in overcritical carbon dioxide medium at 32 to 100°C and pressure 7.5-35.0 MPa with periodicity 1-5 times.

EFFECT: increased efficiency of impregnation of densely packed hydroxyl-containing polymers due to preliminary splitting of hydrogen bonds and increasing porosity of polymers so enabling assortment of impregnated polymers to be enlarged.

3 cl, 1 tbl, 3 ex