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US 4,755,450 AGranted
Spectral sensitizing dyes in photopolymerizable systems
AssigneeMinnesota Mining and Manufacturing Company
InventorsJames F. Sanders, David B. Olson
Life of this patent
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Abstract
Spectral sensitizing dyes which sensitize photoinitiators and disperse in aqueous solutions are desirable in photosensitive systems where precise color rendition is important.
Claims10
A photopolymerizable system comprising
- 10-60% by weight of an ethylenically unsaturated polyfunctional monomer,
- 10-60% by weight of an ethylenically unsaturated polyfunctional polymer,
- 10-60% by weight of a polymeric binder, and
- 0.1-20% by weight of a photoinitiator system comprising a tertiary amino aryl ketone dye having at least one carboxylic acid group thereon and a free radical photoinitiator selected from the group consisting of photoacid generating free radical photoinitiator and a biimidazole and
- wherein said dye has the formula:
- ##STR11## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.6 are independently selected from the group consisting of hydrogen, alkyl, aryl, and 5- or 6-membered heterocyclic rings containing on C, N, S, Se, or O ring atoms,
- R.sup.5 represents the atoms necessary to complete a 5-, 6-, 7-membered heterocyclic ring having only C, N, S, Se, and O atoms therein, with no more than 2 ring atoms being other than C, and,
- at least one of R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6 and R.sup.7 has a carboxylic and group thereon and at least one of R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.6 is an aromatic group having a dialkylamino, diarylamino, or alkylaryl amino substituent.
5 more elements
A photopolymerizable system comprising
- 10-60% by weight of an ethylenically unsaturated polyfunctional monomer,
- 10-60% by weight of an ethylenically unsaturated polyfunctional polymer,
- 10-60% by weight of a polymeric binder, and
- 0.1-20% by weight of a photoinitiator system
- comprising a tertiary amino aryl ketone dye having at least one carboxylic acid group thereon and a free radical photoinitiator selected from the group consisting of photoacid generating free radical photoinitiator and a biimidazole, and
- wherein said ethylenically unsaturated monomer and polymer (1) comprise polyacryloyl and polymethacryloyl monomer and (2) polyacryloyl and polymethylacryloyl polymers and sufficient colorant to provide a transmission optical density of at least 0.3 at a dry coating weight of 25 mg/m.sup.2 and
- wherein said photoacid generating free radical photoinitiator is selected from the group consisting of photosensitive iodonium salts, photosensitive sulfonium salts, and s-triazines.
4 more elements
Dependencies are inferred from the claim text.