FIELD: chemistry.
SUBSTANCE: invention pertains to use of polyvinyl alcohols with functional silane groups in primary coating for separate paper and film layers, containing at least, one silane containing polyvinyl alcohol based on fully or partially saponified copolymers of complex vinyl esters with degree of hydrolysis from 75 to 100 mol.%, which are obtained through radical polymerisation of monomers (a) and (b), as well as comonomers (c) when necessary. The invention also relates to the method of depositing adhesive coating for separate paper and film layers, including primary coating of a substrate using a primary coat containing the above mentioned silane containing polyvinyl alcohol, and subsequent depositing of silicon layer.
EFFECT: early depositing on paper and film layers of the given silane containing polyvinyl alcohols, as primary coating, allows preventing penetration of the silicon layer into the substrate during the depositing process, and also allows increasing resistance to abrasion of the silicon coated surface; besides that, viscosity of the polyvinyl alcohols does not increase during storage, and this leads to increased storage time of separate paper and film layers.
7 cl, 3 ex, 2 tbl
