Thermal transfer dyesheets
US5106817A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 5, 1989 |
| Grant date | Apr 21, 1992 |
| Priority date | — |
| Expiry date | Dec 5, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S428/914
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A cleaner thermal transfer dyesheet comprises a supportive base material coated with a composition of a thermally transferable dye dispersed throughout a polymer matrix, the dye being composed of organic molecules alignable to form crystals having a major axis, and a molecular structure having at least one carbon atom bonded to a single moiety and positioned in the molecule such that the size of said moiety effects the rate of crystal growth along the major axis; the coating having in addition to the dye molecules, a minor amount of a crystallization modifier consisting of molecules essentially the same as the dye molecules except that said moiety is replaced by a more bulky substituent. Likewise, where the dye is recognized as having a molecular structure with one or more carbon atoms each bonded to a single moiety positioned to extend from the prime face, a crystallization modifier consists of molecules essentially the same as the dye molecules except that said moiety is replaced by a more bulky substituent. The effect of adding a minor amount of such crystallization modifie is to provide a cleaner, more stable dyesheet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.