HEAT-CURABLE COMPOSITION AND MULTILAYER COMPOSITE BASED ON SAID COMPOSITION, HAVING IMPROVED ADHESION

摘要

FIELD: chemistry. ^ SUBSTANCE: composition contains: (a) a film-forming polymer with reactive functional groups; (b) a curing a curing agent with functional groups which react with groups from (a) and (c) an adhesion promoter. The adhesion promoter is obtained from (i) boric acid or boron-containing compounds which are hydrolysed to boric acid, and (ii) an ester with two or more terminal hydroxyl groups. The adhesion promoter is present in an amount which is sufficient to obtain boron content of 0.001-5 wt %. The ester is obtained via condensation of polybasic carboxylic acids and polybasic alcohols, some of which are 1,3-polyol. The ratio of boric acid equivalents or equivalent thereof and hydroxyl is greater than 0.1:1, and the ratio of equivalents of 1,3-polyol and carboxylic acid is greater than 2:1. A multilayer composite is obtained from the heat-curable composition. The composite has a first polymer layer formed on a substrate and a second polymer layer formed on top of the first layer. ^ EFFECT: invention enables to obtain multilayer composite coatings with improved interlayer adhesion. ^ 31 cl, 6 tbl, 40 ex