Ionic halomethyl-1,3,5-triazine photoinitiators
AssigneeMinnesota Mining and Manufacturing Company
InventorJames Alan Bonham
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Abstract
Novel water-soluble triazine photoinitiators and bifunctional ionic photoinitiators having an anion containing a photo-labile halomethyl-1,3,5-triazine and a photoinitiator cation are described. The ionic compounds are good photointiators for initiating free radical and acid sensitive reactions. The ionic photoinitiators are easily synthesized and eliminate the need for a combination of photoinitiators in a photocurable, photopolymerizable, or photoacid sensitive composition. Additionally, the radiation-sensitive compounds are resistant to migration in photosensitive compositions. The ionic photoinitiators are particularly useful in compositions for use in printing, duplication, copying, and other imaging systems.
Claims11
An ionic bifunctional photoinitiator having the structure:
- P.sup.+ T.sup.-
- wherein P.sup.+ is a radiation-sensitive onium organic cation and T.sup.- is a halomethyl-1,3,5-triazine anion, said anion having a 1,3,5-triazine nucleus with at least one trihalomethyl group covalently attached to a carbon atom of said 1,3,5-triazine nucleus and a linking group covalently attached to both a second carbon atom of said 1,3,5-triazine nucleus and an anionic group.
A process for preparing an ionic bifunctional photoinitiator of comprising the steps of:
- (a) providing a salt P.sup.+ X.sup.- in a solvent, wherein P.sup.+ is a radiation-sensitive onium organic cation and X.sup.- is an inorganic anion;
- (b) providing a salt M.sup.+ T.sup.- in a second solvent, wherein
- M.sup.+ is selected from the group consisting of a hydrogen proton, an organic cation, or an alkali metal cation, and
- T.sup.- is a halomethyl 1,3,5-triazine anion, said anion having a 1,3,5-triazine nucleus with at least one trihalomethyl group covalently attached to a carbon atom of said 1,3,5-triazine nucleus and a linking group covalently attached to both a second carbon atom of said 1,3,5-triazine nucleus and an anionic group;
- (c) mixing said salt P.sup.+ X.sup.- with said salt M+T.sup.- to provide said ionic bifunctional photoinitiator represented by the general formula P.sup.+ T.sup.-.
Dependencies are inferred from the claim text.