Prepasted wallcoverings

Details Prepasted wallcoverings Prepasted wallcoverings

C - Chemistry, Metallurgy

09

J

117/28

C09J 7/04 (2006.01) C08J 3/14 (2006.01)

Patent

CA 1249489

ABSTRACT Prepasted Wallcoverings A wallcovering comprises a substrate carrying a water-moistenable coating formed of at least two layers. The layer adjacent to the substrate generally comprises unswollen particles of an anionic polymer that is substantially non-swellable in water and that is swellable in aqueous alkali and the upper layer contains an alkali which on contact with water forms an alkaline solution which swells the anionic polymer and a water soluble cationic polymer. The anionic polymer generally comprises beads of cross-linked copolymers of lower alkyl acrylates and methacrylic acid having a molecular weight of about 5 million. Processes for producing the wallcoverings comprise coating the substrate separately with an aqueuous dispersion of the anionic polymer and an aqueous solution containing both the cationic polymer and the alkaline material to give at least two separate layers.

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