COMPLEX POLYESTERS AND THEIR COATINGS Russian patent published in 2018 - IPC C08G63/12 C08G63/20 C08L67/02 C08L75/06 C08G18/42 C09D167/02 C09D175/04 

FIELD: chemistry.

SUBSTANCE: complex polyester obtained from a mixture of reagents is described, including: a) aromatic monoacid where aromatic monoacid is from 25 to 60 wt % when calculating the total mass of the reagents; b) poliacid where poliacid has less than 90 mol % of isophthalic acid; and c) polyol containing at least 3 hydroxyl groups. The mixture of reagents contains less than 1000 parts based on parts per million (ppm) of nonaromatic monoacid, and the above-mentioned polyester is characterized by a dynamic viscosity greater than 15,000 centipoises at 40°C under measurement when using the viscometer Physica MCR 301 rheometer with a parallel plate of 25 mm and a gap of 0.1 mm, depending on the increasing shear rate (from 0.1 to 10 s^-1), and an acid number smaller than 15 mg KOH/g. A composition of the coating is also described, containing: a) polyester obtained from a mixture of reagents comprising: 1) aromatic monoacid where aromatic monoacid is from 25 to 60 wt % when calculating the total mass of the reagents; 2) poliacid where poliacid has less than 90 mol % of isophthalic acid; and 3) polyol containing at least 3 hydroxyl groups, where the mixture of reagents contains less than 1000 ppm of nonaromatic monoacid, and the above-mentioned polyester is characterized by a dynamic viscosity greater than 15,000 centipoises at 40°C under measurement when using the viscometer Physica MCR 301 rheometer with a parallel plate of 25 mm and a gap of 0.1 mm, depending on the increasing shear rate (from 0.1 to 10 s^-1), and an acid number smaller than 15 mg KOH/g; and b) a stapler. A substrate is described, at least a part of the surface of which is coated with the above composition.

EFFECT: production of coatings characterized by good chemical resistance, scratch resistance and weather resistance, high solid content and low volatile organic compounds.

19 cl, 9 tbl, 7 ex