Plasticized UV/EB cured coatings
View Patent ↗A plasticized ultraviolet electron beam (UV/EB) canonically cured coating, such as a release layer or print from UV/EB cured inks, comprises polymers with a reactive plasticizer incorporated therein. The cured coating contains the plasticizing additives permanently attached to the polymer matrix, locking them in place, and permanently flexibilizing the cured coating. The cured coating finds use on varied substrates including printable substrates used in conventional printers and those with release layers for adhesive labels. Coating formulations which form these canonically cured coatings comprise canonically polymerizable monomers and/or oligomers, a reactive plasticizer which is food grade, cosmetic grade, medical grade or biologically benign when incorporated in the polymer backbone, and a catalyst.
1. A plasticized ultraviolet or electron beam (UV/EB) cationically cured coating formulation comprised of polymers formed from:
component A: a cationically polymerized monomers and/or oligomers, which are epoxy monomers, epoxy oligomers, oxetane monomers, oxetane oligomers, vinyl ether monomers, vinyl ether oligomers, or combinations thereof, the epoxy monomers or epoxy oligomers having a viscosity of 25.000 cps or less at 25° C. in the absence of a solvent, and
component B: at least one plasticizer which is permanently integrated within the cured coating formulation, wherein the at least one plasticizer is completely incorporated into the polymer backbone and wherein the at least one plasticizer is chosen from:
polypropanediol dimer dilinoleate,
dimer dilinoleyl dimer dilinoleate,
polyglyceryl-6 behenate,
polyglyceryl-6 polyricinoleate,
diisopropyl dimer dilinoleate or combinations of two or more thereof.
2. The cured coating formulation of claim 1 , further comprising at least one coupling agent having the formula R 1 n —Si—OR 2 (4-n) , where n is 2 and R 1 contains a cycloaliphatic epoxy, vinyl ether, or oxetane moiety, and R 2 is an optionally substituted C 1-6 hydrocarbon.
3. The cured coating formulation of claim 1 , further comprising at least one or more coupling agents selected from the group consisting of:
2-(3,4-epoxycyclohexyl)ethyl methyl diethoxy silane,
2-(3,4-epoxycyclohexyl)ethyl triethoxy silane,
2-(3,4-epoxycyclohexyl)ethyl trimethoxy silane,
5,6-epoxyhexyl triethoxy silane, and
combinations thereof.
4. The cured coating formulation of claim 1 , the composition further comprising at least one of colorants, pigment dispersants, defoamers, and fillers.
5. The cured coating formulation of claim 1 , wherein the cured coating formulation is a release layer for an adhesive label.
6. The cured coating formulation of claim 1 , wherein the oxetane monomers or oxetane oligomers are of the formula:
wherein R, R 1 , R 2 , and R 3 are each, independently, H or C 1-8 alkyl with the proviso that at least one of R 1 and R 2 are non-hydrogen substituents.
7. The cured coating formulation of claim 6 , wherein at least one of R 1 and R 2 is —CH 2 OH or —CH 2 (OH)(CH 3 ).
8. The cured coating formulation of claim 6 , wherein the oxetane monomers or oxetane oligomers have a viscosity of 25,000 cps or less at 25° C., in the absence of a solvent.
9. The cured coating formulation of claim 1 , wherein vinyl ether monomers or vinyl ether oligomers are of the formula:
wherein R and R′ are each, independently, H or C 1-8 alkyl.
10. The cured coating formulation of claim 9 , wherein R and R′ are each H.
11. The cured coating formulation of claim 9 , wherein at least one of R and R′ is CH 3 .
12. The cured coating formulation of claim 9 , wherein the vinyl ether monomers or vinyl ether oligomers have a viscosity of 25,000 cps or less at 25° C., in the absence of a solvent.
13. A plasticized ultraviolet or electron beam (UV/EB) cationically cured coating formulation comprised of polymers formed from:
component A: a cationically polymerized monomers and/or oligomers, which are epoxy monomers, epoxy oligomers, oxetane monomers, oxetane oligomers, vinyl ether monomers, vinyl ether oligomers, or combinations thereof, and
component B: at least one reactive plasticizer which is permanently integrated within said composition,
wherein:
the at least one reactive plasticizer possesses one or more functional groups that react as chain transfer groups or chain terminating groups with cationically polymerized monomers and/or oligomers,
the at least one reactive plasticizer is completely incorporated into the polymer backbone and is biologically benign in that state,
further comprising at least one coupling agent having the formula R 1 n —Si—OR 2 (4-n) , where n is 2 and R 1 contains a cationic-reactive group which is a cycloaliphatic epoxy, vinyl ether, or oxetane moiety, and R 2 is an optionally substituted C 1-6 hydrocarbon, and
said composition forms a printed ink image.
14. The cured coating formulation of claim 13 , wherein the at least one reactive plasticizer is:
polypropanediol dimer dilinoleate,
dimer dilinoleyl dimer dilinoleate,
polyglyceryl-6 behenate,
polyglyceryl-6 polyricinoleate,
diisopropyl dimer dilinoleate or combinations of two or more thereof.
15. A plasticized ultraviolet or electron beam (UV/EB) cationically cured coating formulation comprised of polymers formed from:
component A: a cationically polymerizable monomers and/or oligomers selected from epoxy monomers, epoxy oligomers, oxetane monomers, oxetane oligomers, vinyl ether monomers, vinyl ether oligomers, or combinations thereof, and
component B: at least one reactive plasticizer, wherein the at least one reactive plasticizer possesses two or more functional groups that react as chain transfer groups or chain terminating groups with the cationically polymerized monomers and/or oligomers, wherein the at least one reactive plasticizer is completely incorporated into the polymer backbone and is biologically benign in that state, and
component C: a cationic photoinitiator wherein:
the at least one reactive plasticizer is a polydimethyl silicone polymer with diol end groups which completely incorporates in the polymer backbone and is biologically benign in that state, and further comprising at least one coupling agent having the formula R 1 n —Si—OR 2 (4-n) , where n is an integer of 1 or 2 R 1 contains a cationic-reactive group which is a cycloaliphatic epoxy, vinyl ether, or oxetane moiety, and R 2 is an optionally substituted C 1-6 hydrocarbon.
16. The cured coating formulation of claim 15 , wherein the at least one or more coupling agents is:
2-(3,4-epoxycyclohexyl)ethyl methyl diethoxy silane,
2-(3,4-epoxycyclohexyl)ethyl triethoxy silane,
2-(3,4-epoxycyclohexyl)ethyl trimethoxy silane, or
5,6-epoxyhexyl triethoxy silane.
17. The cured coating formulation of claim 15 , which is an ink.
18. The cured coating formulation of claim 15 , wherein the coating is a release layer for an adhesive label.