UNDERCOATING WITH LONG OPEN TIME FOR POLYMER SUBSTRATES Russian patent published in 2010 - IPC C09D175/04 C08J7/04 C09J175/04 C09K3/10 

FIELD: chemistry.

SUBSTANCE: invention relates to undercoating compositions containing at least one polyurethane prepolymer A with isocyanate groups; at least one aliphatic polyisocyanate B; at least one aromatic polyisocyanate C; at least one reaction product D, obtained from at least one epoxysilane and at least one aminosilane with quantitative ratio of atoms of active hydrogen of the amine to the number of epoxy groups of the epoxysilane equal to 3:1-1:3, or at least one epoxysilane and at least one mercaptosilane with quantitative ratio of mercapto groups to epoxy groups equal to 1.5:1-1:1.5, with content of product D equal to 0.5-15 wt % of the total weight of A+B+C+D. The invention also relates to use of the undercoating composition as an undercoating for adhesives, sealants and floor coatings.

EFFECT: good adhesion to problematic substrates with long open time.

24 cl, 2 tbl