RMA-CROSS-LINKABLE COMPOSITIONS AND RMA-CROSS-LINKED RESINS TO OBTAIN EASY-TO-CLEAN COATINGS Russian patent published in 2020 - IPC C09D167/08 C08J3/24 C08F8/00 C08L67/08 

FIELD: chemistry; technological processes.

SUBSTANCE: present invention relates to RMA-cross-linkable coating composition. Described is an RMA-crosslinkable coating composition having cleaning properties comprising at least one cross-linkable component containing reactive components A and B, each of which contains at least two reactive groups, wherein at least two reactive groups of component A are acidic protons (CH) in activated methylene or methine groups (RMA-donor group), and at least two reactive groups of component B are activated unsaturated groups (C=C) (RMA-acceptor group), which are capable of reacting to form cross bonds by a Michael addition reaction (RMA) between said at least one cross-linkable components in the presence of a basic catalyst (C), wherein said cross-linkable composition is characterized in that a) the composition contains fatty components selected from a group consisting of fatty acids, fatty alcohols, fatty amines, fatty thiols and a dimeric fatty acid, b) in an amount expressed as oil (OC) content of 4 to 40 wt %, preferably at least 10 or more preferably at least 14 wt %, defined as total weight of fatty components relative to total weight of solid substances in cross-linkable composition, wherein c) said components in the cross-linkable composition are selected so that after curing, a coating with density (XLD) of cross-links of the polymer network is formed, which, taking into account pigment effects, at least 1.4, preferably at least 1.6, more preferably at least 1.9, even more preferably at least 2.5, most preferably at least 3.5 mmol/g, as determined by DMTA (dynamic mechanical thermal analysis) measurement when examining the cured coating film, wherein d) said components in the cross-linkable composition are selected so, that after curing a coating is obtained, having, without taking into account the effects of pigments, a glass transition temperature Tg determined by DMTA measurement of at least 290 K (about 17 °C), preferably at least 300 K (about 27 °C), more preferably at least 305 (about 32 °C), at least 310 K (about 37 °C) and 320 (about 47 °C), more preferably at least at least 330 K (about 57 °C), e) and wherein OC, XLD and Tg are jointly selected such that the purification index ΔE is less than 20, preferably less than 15 or more preferably less than 10 and most preferably less than 5, as determined by measuring color difference before and after pigment application and removal, as described herein. Also described is a method of coating a substrate surface, RMA-cross-linkable fatty resin for producing a coating (versions), use of an RMA-cross-linkable coating composition (versions), a cured top coat.

EFFECT: high resistance to water and chemical attack, adhesion, resistance to impact and abrasion.

20 cl, 16 tbl