| abstract |
FIELD: polymers, covering compositions. n SUBSTANCE: invention relates to photoactivating aqueous-base covering composition. The proposed composition comprises the following components: a)(meth)acryloyl-functional polyurethane dispersion wherein this (meth)acryloyl-functional polyurethane comprises from 5 to 18 weight % of alkylene-oxide groups and (meth)acryloyl functionality represents a value in the range from 2 to 40, and b) UV-initiating agent. The presence of reactive diluting agent in the covering composition is preferable. (Meth)acryloyl-functional polyurethane can be prepared by carrying out the following interactions: a) at least one organic polyisocyanate; b) optionally, at least one organic compound comprising at least two isocyanate-reactive groups and having an average molecular mass in the range from 400 to 6000 Da; c) at least one isocyanate-reactive and/or isocyanate-functional compound comprising non-ionogenic dispersing groups; d) at least one isocyanate-reactive (meth)acryloyl-functional compound; e) optionally, at least one chain elongating agent comprising active hydrogen, and f) optionally, at least one compound comprising active hydrogen and ionic groups. Aqueous-base covering composition is useful especially for applying as a clear cover. Covers based on the proposed composition show resistance to water, solvents and scratches and flexibility and high adhesion also. n EFFECT: improved and valuable properties of composition. n 15 cl, 12 tbl, 17 ex |