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US 4,173,476 AGranted
Complex salt photoinitiator
AssigneeMinnesota Mining and Manufacturing Company
InventorsGeorge H. Smith, Peter M. Olofson
Life of this patent
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Abstract
A triarylsulfonium complex salt is described which has particular utility as a photoinitiator for the polymerization of epoxide monomers in thick films or coatings. Photopolymerizable compositions are also described.
Claims12
A triarylsulfonium complex salt of the formula:
- ##STR10## where X is F or OH;
- R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are each selected from H, lower alkyl, alkoxy, or halogen.
A photopolymerizable composition comprising (a) organic material having epoxide functionality, and (b) an effective amount of a complex salt of the formula:
- ##STR11## where X is F or OH;
- R.sub.1 ;
- R.sub.2, R.sub.3 and R.sub.4 are each selected from H, lower alkyl, alkoxy, or halogen.
A method for hardening polymerizable compositions comprising the steps of:
- (a) providing a photopolymerizable composition comprising (i) organic material having epoxide functionality;
- and (ii) an effective amount of a complex salt of the formula ##STR13## where X is F or OH;
- R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are each selected from H, lower alkyl, alkoxy, or halogen;
- (b) disposing said composition on a substrate;
- (c) exposing said composition to actinic radiation at an intensity and for a time sufficient to harden said composition.
2 more elements
Dependencies are inferred from the claim text.