Prepasted wallcoverings
US4639395A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 14, 1985 |
| Grant date | Jan 27, 1987 |
| Priority date | — |
| Expiry date | Mar 14, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31993
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
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 aqueous 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.