Acrylamido functional disubstituted acetyl aryl ketone photoinitiators
AssigneeMinnesota Mining and Manufacturing Company
InventorsGaddam N. Babu, Greggory S. Bennett, Kejian Chen, Steven M. Heilmann, Howell K. Smith, II, Louis E. Winslow
Life of this patent
Estimating the term…
Abstract
The invention provides novel acrylamide functional disubstituted acetyl aryl ketones and a process for their preparation in high yields uncontaminated by difunctional material. The invention further provides photocrosslinkable compositions comprising one or more ethylenically-unsaturated monomers and as photoinitiator the acrylamide functional disubstituted acetyl aryl ketone of the invention. The compositions are useful for the preparation of films and coatings, particularly pressure-sensitive adhesive coatings.
Claims30
The acrylamide functional disubstituted acetyl aryl ketone compound having the formula:
- ##STR17## wherein R.sup.1 is hydrogen or methyl;
- R.sup.2 and R.sup.3 independently are an alkyl group of 1 to 14 carbon atoms, a cycioalkyl group of 3 to 14 carbon atoms, an aryl group of 5 to 12 ring atoms, an arenyl group having 6 to 16 carbon atoms, the aryl and arenyl groups up to 3 heteroatoms selected from S, N, and nonperoxidic O, or R.sup.2 and R.sup.3 taken together with the carbon atom to which they are joined form a carbocyclic ring of 4 to 12 ring atoms;
- W is -O-, -S-, or -NH- or a divalent connecting group joining the carbonyl group of the acrylamidoacetyl functional group to the photosensitive group, P;
- and
- P is a radiation sensitive aryl ketone group capable of Norrish Type I cleavage, said compound being a photoinitiator.
A polymeric photoinitiator comprising units having the formula ##STR25## in which R.sup.1, R.sup.2, R.sup.3, W, and P are the same as defined above;
- R.sup.9 is one or more groups as determined by the identity of the ethylenically-unsaturated monomers in the polymerizable composition;
- and a and b are each numbers having a value sufficient to provide to the linear polymer a number average molecular weight of from about 1000 to 5,000,000, the mole ratio, b/(a+b), having a value from about 0.0001 to 0.5.
Dependencies are inferred from the claim text.