Substrate for image-receiving sheet material
US5476708A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 6, 1993 |
| Grant date | Dec 19, 1995 |
| Priority date | — |
| Expiry date | Jul 6, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31913
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Photographic base paper (10) has a face side waterproof coating which is a co-extruded layer structure of at least a pigmented core layer (P) and top surface layer (E) of polyethylene. The thickness of layer (E) is no more than 12 .mu.m. The pigment content in the face side coating is at least 2 gm.sup.-2 and it is distributed such that the proportion by weight of pigment in the core layer is at least 1.75 times as great as the proportion by weight of pigment in the top surface layer. For optimum photodefinition (image sharpness) the top surface layer should be free of pigment, but as thin (1.5 to 3 .mu.m) as possible. The pigment is preferably TiO.sub.2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.