Polymeric photoinitiators
View Patent ↗UV curable compositions, polymeric photoinitiators and precursors therefor are described.
1. An amide-linked photoinitiator having the following structure:
wherein
Q is a small molecule or polymer,
Ar is selected from the group consisting of:
R is independently a linear or branched alkyl group, cycloalkyl, alkylenoxy, alkenyl or aryl group, an alkyl group containing a heteroatom or a carbonyl group,
R 1 is independently a linear or branched alkyl group, cycloalkyl, alkylenoxy, alkenyl or aryl group, an alkyl group containing a heteroatom, a carbonyl group or H,
R 2 is independently linear or branched alkyl group, cycloalkyl, alkylenoxy, alkenyl or aryl group, an alkyl groups containing a heteroatom, a carbonyl group, H, OR, NR 2 , SR, F, Cl, Br or I,
X is O, NR, S, PR, or SiR 2 ,
m=0 or 1,
n=1, and
y=1-100.
2. The amide-linked photoinitiator of claim 1 where Q is derived from maleinized poly(butadiene), maleinized poly(isoprene), maleinized poly(styrene-b-butadiene-b-styrene), or maleinized poly(styrene-b-isoprene-styrene), maleinized poly(styrene-b-ethylene/butylene-b-styrene), maleinized poly(styrene-b-ethylene/propylene-b-styrene) or an anhydride functional acrylic polymer.
3. A photocurable composition comprising the photoinitiator of claim 1 .
4. The photocurable composition of claim 3 which is a pressure sensitive adhesive.
5. A thiol-ene photocurable composition comprising a multifunctional thiol, a multifunctional olefin, and a photoinitiator claim 1 .
6. The amide-linked photoinitiator of claim 1 where m is 1.
7. The amide-linked photoinitiator of claim 1 where Q is derived from styrene-butadiene-styrene (SBS); styrene-isoprene-styrene (SIS); poly(butadiene); random styrene-butadiene-styrene rubber (SBR); acrylate polymers containing pendant or backbone unsaturation; maleinized poly(butadiene), maleinized poly(isoprene), maleinized poly(styrene-b-butadiene-b-styrene), or maleinized poly(styrene-b-isoprene-styrene), maleinized poly(styrene-b-ethylene/butylene-b-styrene), maleinized poly(styrene-b-ethylene/propylene-b-styrene) or an anhydride functional acrylic polymer.
8. The amide-linked photoinitiator of claim 1 where m is 0; R 1 is H and Q is derived from maleinized poly(butadiene), maleinized poly(isoprene), maleinized poly(styrene-b-ethylene/butylene-b-styrene), and maleinized poly(styrene-b-ethylene/propylene-b-styrene).
9. The amide-linked photoinitiator of claim 1 where m is 0; and R 1 is H.
10. The amide-linked photoinitiator of claim 1 where m is 0; R 1 is H and Q is derived from styrene-butadiene-styrene (SBS); styrene-isoprene-styrene (SIS); poly(butadiene); random styrene-butadiene-styrene rubber (SBR); acrylate polymers containing pendant or backbone unsaturation; maleinized poly(butadiene), maleinized poly(isoprene), maleinized poly(styrene-b-butadiene-b-styrene), or maleinized poly(styrene-b-isoprene-styrene), maleinized poly(styrene-b-ethylene/butylene-b-styrene), maleinized poly(styrene-b-ethylene/propylene-b-styrene) or an anhydride functional acrylic polymer.
11. The amide-linked photoinitiator of claim 1 where Ar is a benzophenone derivative.