Cover film for hard copy printing paper
US4977136A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 4, 1989 |
| Grant date | Dec 11, 1990 |
| Priority date | — |
| Expiry date | Oct 4, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31855
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The present invention relates to a cover film for hard copy printing paper which can easily form a colorless and transparent protecting layer on the surface of, for example, a printing paper on which a color picture image is printed. The cover film for hard copy printing paper is such one that the cover film for hard copy printing paper is formed on the surface of a hard copy printing paper on which the printing is carried out by the sublimation transfer method and the cover film is designed to include at least one layer the glass transition temperature of which is selected to be higher than 40.degree. C. and whose water absorbing ratio (ASTM D570) is selected to be lower than 2%, whereby even under high temperature and high humidity, the bad influence exerted by the movement of a dye can be removed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.