Production of radiation curable microcapsular coating compositions, pressure-sensitive transfer paper and its production
US4228216A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 5, 1978 |
| Grant date | Oct 14, 1980 |
| Priority date | — |
| Expiry date | Jun 5, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2985
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The invention relates to a process for producing a radiation curable coating composition containing microcapsules having a hydrophobic liquid core as follows: An emulsion containing droplets of hydrophobic emulsion component dispersed in a hydrophilic liquid component is prepared. The hydrophobic emulsion component comprises a hydrophobic liquid and a first wall-forming material soluble therein and capable of reacting by condensation polymerization with a second wall-forming material to form a polymeric capsule wall which is substantially insoluble in, and impermeable to, the hydrophilic and hydrophobic emulsion components. The hydrophilic emulsion component comprises an emulsifier and a radiation curable hydrophilic liquid which comprises water and at least one radiation curable polar compound. The emulsion also contains the second wall-forming material. The emulsion is subjected, with stirring, to temperature conditions for a period of time sufficient to react the first and second wall-forming materials to form a dispersion of microcapsules in the hydrophilic emulsion component. The radiation curable dispersion containing a photoinitiator can be coated on a paper substrate and se…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.