METHOD OF OBTAINING POLYURETDIONE RESINS Russian patent published in 2014 - IPC C08G18/79 C08G18/09 C08G18/32 C09D5/03 C09D167/02 C09D163/00 C09D175/04 

FIELD: chemistry.

SUBSTANCE: clamed invention relates to method of obtaining polyuretdione resin with carboxyl functional groups for application in powder covering compositions, which includes stages: (a) carrying out reaction of at least one isokyanite NCO functional uretdione with at least one alcohol in ratio of free NCO groups to hydroxyl groups in the range from 0.5:1 to 0.5:3, and (b) carrying out reaction of resulting hydroxyl-functional polyuretdione with di- and/or polyfunctional acid(acids) and/or their anhydride(anhydrides), resulting polyuretdine resin with carboxyl functional groups has carboxyl number in the range from 20 to 300 mg KOH/g, where carboxyl number is determined according to DIN EN ISO 2114. Also described are: obtained by claimed method polyuretdione resin with carboxyl functional groups, powder covering composition, which contains such resin, method of applying covering on substrate, as well as substrate covered with powder covering composition.

EFFECT: creation of method of obtaining polyuretdione resin, which ensures large density of transverse bonds in application as hardener in powder covering compositions, as well as desirable technological properties of powder coverings, such as low temperatures of hardening, thin films and high elasticity in combination with perfect stability of covering layers to atmospheric impact.

10 cl, 4 tbl, 3 ex