HIGHLY CONCENTRATED WATER NANO-SIZE PU-DISPERSION, WHICH DOES NOT CONTAIN SOLVENT, METHOD OF ITS OBTAINING AND APPLICATION Russian patent published in 2015 - IPC C08G18/00 B82B3/00 C08G18/12 C08G18/48 C08G18/67 C08J3/03 C08L75/00 

FIELD: chemistry.

SUBSTANCE: described is method of obtaining highly concentrated water nano-size polyurethane dispersion, which does not contain organic solvent, with concentration of basic substance 30-60%, which represents product of interaction of: A) at least, one polyisocyanate, which contains, at least, two isocyanate groups; B) one or several polyols with molecular weight (MW) from 1000 to 18000, which have, at least, two hydroxyl groups; C) one or several compounds, at least, with two OH-functional groups, which contain, at least, one carboxyl group, which can be transformed fully or partially into carboxyl group in presence of bases; D) possibly one or several polyols and/or glycidyl ethers of polyols with average molecular weight less than 500, which contain 2 or more hydroxyl and/or epoxy groups; E) one or several tertiary amines; F) one or several polyamines, which contain at least one NH₂-group. Components (A), (B) and (C) are subjected to simultaneous interaction to degree of conversion of isocyanate groups 70-98%, if necessary component (D) is introduced into reaction mass, with the following complete or partial neutralisation of carboxyl groups of component (C) with component (E), dispersion in water, introduction of component (F); dispersion is heated and exposed at temperature from 20 to 90°C for from one to four hours. Also described are highly concentrated water nano-size polyurethane dispersion, obtained by claimed method, and its application for obtaining coatings for different substrates, especially flexible substrates, hermetics and glues.

EFFECT: obtaining coatings with high physical-mechanical properties, such as elasticity, durability, high water resistance.

18 cl, 14 ex, 15 tbl