Stabilizing hydrophilic gelatin holograms having improved resistance to swelling
US4808500A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 20, 1987 |
| Grant date | Feb 28, 1989 |
| Priority date | — |
| Expiry date | Nov 20, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C5/26
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method for treating photosensitive, hydrophilic gelatin holograms to reduce swelling when the gelatin is exposed to moisture. Two reactants which are capable of forming solid reaction products are migrated into the interstitial voids within the gelatin to form a filled gelatin which is resistant to both swelling and shrinkage due to moisture variations. Embodiments are disclosed in which the reactants are migrated simultaneously and sequentially into the gelatin. Examples of a first reactant are silane, chloronated silanes (trichlorosilane and tetrachlorosilane, fluorosilane) and a second reactant oxygen, ammonia, water vapor and suitable gaseous sources of oxygen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.