CURABLE FILM-FORMING COMPOSITIONS WITH LONGER OVERLAPPING TIME Russian patent published in 2019 - IPC C09D175/04 C08G18/08 C08G18/18 C08G18/16 

FIELD: chemistry.

SUBSTANCE: invention relates to a curable film-forming composition, methods of controlling rate of hardening and increasing time of overlapping of curable film-forming compositions. Curable film-forming composition includes: (a) a curing agent containing reactive isocyanate functional groups, (b) a film-forming compound containing functional groups reactive with reactive isocyanate functional groups in (a), (c) a photolatent catalyst, (d) beta-diketone with a flash point higher than 60 °C (140 °F) and (e) beta-diketone with a flash point less than or equal to 60 °C (140 °F). Method of controlling rate of hardening and longer time for overlapping curable film-forming composition is achieved by adding to curable composition catalytic component, which includes: (i) a photolatent catalyst, (ii) beta-diketone with a flash point higher than 60 °C (140 °F), and (iii) beta-diketone with a flash point less than or equal to 60 °C (140 °F).

EFFECT: invention enables to obtain a curable film-forming composition which has good controlled viability, fast curing with considerable drying time, as well as high gloss and low haze in the overspray region.

21 cl, 14 tbl, 26 ex