Polymeric photoinitiators
View Patent ↗UV curable compositions, polymeric photoinitiators and precursors therefor are described.
1. A siloxane-linked photoinitiator having the following structure:
wherein
Q is a 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 H,
R 1 is independently a linear or branched alkyl group, cycloalkyl, alkylenoxy, alkenyl or aryl group, or 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 group 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 ,
n=0–2, and
m=0 or 1, and
y=1–100.
2. The photoinitiator of claim 1 wherein Q is selected from the group 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.
3. A photocurable composition comprising the photoinitiator of claim 1 .
4. The 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 of claim 1 .
6. A siloxane-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 H,
R 1 is independently a linear or branched alkyl group, cycloalkyl, alkylenoxy, alkenyl or aryl group, or 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 group 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 ,
n=0–2,
m=1, and
y=1–100.
7. The photoinitiator of claim 6 wherein Q is selected from the group 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.
8. A photocurable composition comprising the photoinitiator of claim 6 .
9. The composition of claim 8 , which is a pressure sensitive adhesive.
10. A thiol-ene photocurable composition comprising a multifunctional thiol, a multifunctional olefin, and a photoinitiator of claim 6 .
11. A photoinitiator having the following structure:
12. A siloxane-linked photoinitiator derived from the reaction of the SiH-functional arylketone with an unsaturated compound, said SiH-functional arylketone having the following structure:
wherein
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 H,
R 1 is independently a linear or branched alkyl group, cycloalkyl, alkylenoxy, alkenyl or aryl group, or 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 group 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 ,
n=0–2, and
m=1.
13. A photocurable composition comprising the photoinitiator of claim 12 .
14. The composition of claim 13 which is a pressure sensitive adhesive.
15. A thiol-ene photocurable composition comprising a multifunctional thiol, a multifunctional olefin, and a photoinitiator of claim 12 .
16. A siloxane-linked photoinitiator derived from the reaction of the SiH-functional arylketone with a polymer, said SiH-functional arylketone having the following structure:
wherein
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 H,
R 1 is independently a linear or branched alkyl group, cycloalkyl, alkylenoxy, alkenyl or aryl group, or 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 group 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 ,
n=0–2, and
m=0 or 1.
17. A thiol-ene photocurable composition comprising a multifunctional thiol, a multifunctional olefin, and a photoinitiator of claim 16 .