METHOD OF PRODUCTION OF COATING SYSTEM WITH WATER BASE COAT Russian patent published in 2021 - IPC C09D167/00 C08G63/688 C08G63/672 C09D167/02 C09D175/04 C09D7/40 C08G65/332 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of production of coating based on a system, said method comprising obtaining a base coat based on a hardened film by applying a pigmented water base coat material to the base and subsequent curing of the base coat material, wherein the base coat material comprises a polyether-based reaction product produced by a reaction of (a) at least one cyclic tetracarboxylic acid dianhydride with an aliphatic, aromatic or araliphatic radical X connecting two anhydride groups, with (b) at least one polyether of a general structural formula (II)

wherein R is a C₃ - C₆ alkylene radical, and n is selected so that the polyether (b) has an average molecular weight between 500 and 5000 g/mol, wherein the components (a) and (b) are used in the reaction in a molar ratio of 0.7/2.3 to 1.6/1.7, and the resulting reaction product has the acid number between 5 and 80 mg KOH/g, and wherein the cured base coat film is at least partially the topmost coat of the resulting coating system. Also described is a coated base produced by said method, use of a pigmented water base coat material as a top coat for improved mechanical stability, particularly adhesion, coating systems obtained using such base coat material and cured at a temperature between 70 and 120°C.

EFFECT: significantly better adhesion properties, resistance to cracking even at low curing temperatures, resistance to steam jet testing.

15 cl, 8 tbl, 8 ex