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US 8,940,804 B2Granted
Acrylate-based UV-curable ink, method and an ink base for producing same
AssigneePelikan Hardcopy Production AG
InventorMigjen Rrahimi
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AssigneePelikan Hardcopy Production AG
InventorMigjen Rrahimi
Estimating the term…
The invention relates to an acrylate-based UV-curable ink, in particular ink jet ink, having a content of pigments, radical photoinitiators, dispersing agent(s)and optionally additional additives, characterized in that said ink contains at least two radical photoinitiators of the Norrish type I and at least one radically curable monomer in the form of a polyfunctional alkoxylated and/or polyalkoxylated acrylate monomer, which comprises one or more diacrylates and/or triacrylates, wherein the mol ratio of all acrylates to all initiators is approximately 5:1 to 19:1. The invention further relates to a method for producing a UV-curable ink, in particular an ink jet ink of the aforementioned type, wherein 1) a ground product or an ink base is produced by grinding one or more radically curable monomers in the form of a polyfunctional alkoxylated and/or polyalkoxylated acryl monomer, which comprise one or more diacrylate(s) and/or triacrylate(s), with one or more pigments and dispersing agents, in particular optionally additionally with synergists, stabilizers and further additives, in a high-performance mill, in particular in a pearl mill, until a constant viscosity and/or constant particle size develops, and 2) the resulting ground product is mixed with further acrylate monomers and the radical photoinitiators in the form of the Norrish type I, and optionally other additives. Said ground product exhibits advantageous physical properties at elevated temperatures and in long-term storage.
An acrylate-based UV-curable ink having a content of pigment(s), radical photoinitiators, dispersing agent(s) and optionally further additives, characterised in that it contains at least two radical photoinitiators (A) and (B) of the Norrish Type I and at least one radically curable monomer in the form of a polyfunctional alkoxylated and/or polyalkoxylated acrylate monomer, which comprises one or more diacrylates and/or triacrylates, wherein the mol ratio of all the acrylates to all the initiators is from 7:1 to 15:1 , and the ink has a viscosity (measured using the Bohlin apparatus at 45 ° C.) of 5 to 15 mPa.s, and wherein at least one of the radical photoinitiators of the Norrish Type I is a bifunctional initiator comprising two potential cleaving sites or the at least one radically curable monomer comprises more than one di- and/or tri-acrylates.
An acrylate-based UV-curable ink having a content of pigment(s), radical photoinitiators, dispersing agent(s) and optionally further additives, characterised in that it contains at least two radical photoinitiators (A) and (B) of the Norrish Type I and at least one radically curable monomer in the form of a polyfunctional alkoxylated and/or polyalkoxylated acrylate monomer, which comprises one or more diacrylates and/or triacrylates, wherein the mol ratio of all the acrylates to all the initiators is from 7:1 to 15:1 , and the ink has a viscosity (measured using the Bohlin apparatus at 45 ° C.) of 5 to 15 mPa.s, and wherein at least one of the radical photoinitiators of the Norrish Type I is a bifunctional initiator comprising two potential cleaving sites.
Dependencies are inferred from the claim text.