Photopolymerizable compositions featuring novel co-initiators
US4289844A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 5, 1980 |
| Grant date | Sep 15, 1981 |
| Priority date | — |
| Expiry date | Sep 5, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/125
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A photopolymerizable composition, element and method of photopolymerizing the composition or element are disclosed wherein the composition comprises an addition polymerizable compound containing ethylenic unsaturation and a co-initiator including a photopolymerization activator and a photosensitizer. In one aspect of the invention, the photosensitizer is selected to be a coumarin having an absorption maximum between about 250 and about 550 nm, and a ##STR1## substituent in the 3-position wherein R.sup.1 is alkyl or alkenyl having 1-12 carbon atoms, or a carbocyclic or heterocyclic group having 5-20 nuclear carbon and hetero atoms, the coumarin and the activator being present in an amount sufficient to provide, when the composition is coated, dried and exposed to a medium-pressure mercury light source, a speed which is at least about one-fifth that of the same composition coated, dried and exposed identically except with a co-initiator consisting of Michler's ketone and benzophenone. In another aspect of the invention, the activator is selected to have the structure: ##STR2## wherein: J is -O-, -S- or a carbon-to-carbon bond; PA1 J.sup.1, J.sup.2, and J.sup.3 are each independently …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.