POLYURETHANE COATING COMPOSITION Russian patent published in 2020 - IPC C08L75/04 C09D175/04 C08G18/10 

FIELD: polymer industry.

SUBSTANCE: invention relates to polymer industry and can be used as protective coating for wood, concrete, glass and metal. Polyurethane composition contains the following components, pts.wt.: polytetramethylene ether glycol (770), 4,4'-diphenylmethane diisocyanate (200), diaminopropane (29), metal methylphosphite (29–97), dimethylformamide (460–625). Molecular weight of polytetramethylene ether glycol is 1950. Molar ratio of OH:NCO-groups in 4,4'-diphenylmethane diisocyanate is equal to 1:2. As a modifying additive, composition contains 28–32 wt% of a metal methylphosphite dispersion selected from aluminum, calcium, magnesium, nickel in dimethylformamide.

EFFECT: higher hardness of the coating from the polyurethane composition, its water and oil resistance while maintaining thermal and fire resistance.

1 cl, 2 tbl, 16 ex