Printing inks
AssigneeFlint Ink Corporation
InventorDennis R. Gelarden
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Abstract
The present invention provides compositions of and methods employing printing inks employing novel vinyl resins that are prepared using polyfunctional monomers, wherein the vinyl resins have low number average molecular weights and broad polydispersities. The printing inks of the invention have unexpectedly reduced misting and slinging in high speed press operations.
Claims25
A printing ink composition comprising a solution of a branched vinyl resin having a polydispersity of at least about 15.
A printing ink composition comprising a solution of a branched vinyl resin having a polydispersity of at least about 15 prepared by polymerizing a mixture of monomers that includes at least about 0.008 equivalents, per 100 grams of monomer polymerized, of at least one polyfunctional monomer, said polyfunctional monomer having at least two ethylenically unsaturated polymerizable bonds.
A method of making a printing ink, comprising the steps of:
- (a) preparing a branched vinyl resin by polymerizing a monomer mixture that includes at least one monomer having at least about two ethylenically unsaturated polymerizable bonds per molecule in the presence of a free radical initiator at a temperature at which said free radical initiator has a half-life of less than about two minutes, wherein said polymerization results in less than about 0.5% residual monomer based on the total weight of the monomers being polymerized, and
- (b) combining said branched vinyl resin with at least one other material to form a printing ink, wherein the branched vinyl resin is in solution in the printing ink.
A printing varnish comprising a branched vinyl resin having a polydispersity of at least about 15.
Dependencies are inferred from the claim text.