Foam plastics sheet materials
US4241125A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 10, 1979 |
| Grant date | Dec 23, 1980 |
| Priority date | — |
| Expiry date | Jul 10, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/249981
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Foam plastics sheet material, such as a wallcovering, has a pronounced decorative relief finish and comprises a substrate web with a foam coating some at least of which is blistered. The blistering is achieved by having two foamable coatings on the web, the lower of which is sacrificed to produce the blistering in the upper. In one method the lower coating is foamed, the upper coating is then applied in its pre-foamed state, and then heated so that the lower coating is sacrificed and the upper coating is foamed and blistered. In another method both coatings are applied in their unfoamed state with the lower coating having a lower foaming temperature than that of the upper coating. Both coatings are then heated together. The lower coating foams and is then sacrificed. The upper coating foams and blisters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.