Polymeric photoinitiators
View Patent ↗UV curable compositions, polymeric photoinitiators and precursors therefor are described.
1. A sulfide-linked photoinitiator having the following structure:
wherein
Q is selected from the groups consisting of poly(butadiene), styrene-b-isoprene-b-styrene (SIS), styrene-b-butadiene-b-styrene (SBS), EPDM rubber, styrene-butadiene copolymers (SBR), and acrylate polymers containing pendant or backbone unsaturation,
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 2 is independently a 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, and
y=1-100.
2. A sulfide-linked photoinitiator formed by reacting an unsaturated compound with a compound having the following structure:
3. A sulfide-linked photoinitiator having the following structure:
4. A photopolymerizable composition comprising the photoinitiator of claim 1 .
5. A pressure sensitive adhesive comprising the photoinitiator of claim 1 .
6. A thiol-ene photocurable composition comprising a multifunctional thiol, a multifunctional olefin, and a photoinitiator of claim 1 .