Printing on substrates such as glass using epoxy resin ink compositions

Claim 2

A process according to claim 1 wherein said ink is applied to the substrate surface through a heated metal screen stencil.

Claim 3

A process according to claim 1 wherein the ink comprises cetyl alcohol as the alkanol, phenyl salicylate as the viscosity modifier, and dicyandiamide as the hardener.

Claim 4

A process according to claim 1 wherein, prior to said heat curing step, a second ink of contrasting color which melts at a temperature at least 20* F. lower than said first ink and is cocurable therewith is applied as a liquid over said first ink film at a temperature below the melting point of the latter to form a multicolored label.

Claim 5

A process for providing a glass container with an infusible resinous surface label which comprises a. printing a coating of a normally solid, fusible, cold color ink composition in a predetermined pattern on a cool surface of said container at a temperature above the melting point of said ink and below about 190* F., said composition being composed essentially of (1) 100 parts of a normally solid fusible epoxy resin which melts at a temperature between about 125* and 200* F. and has an epoxide equivalent of between about 140 and 4, 000, (2) 10 to 70 parts of an alkanol which has a melting point between about 100* and 140* F., (3) about 5 to 12 parts of dicyandiamide, (4) 10 to 25 parts of a viscosity modifier selected from the group consisting of benzophenone and phenyl salicylate, and (5) about 0.5 to 60 percent based on the weight of the composition of a nonreactive pigment; and b. heating the imprinted container at a temperature between about 375* and about 500* F. for a period of about 3 to 30 minutes until said coating is cured to form a cross-linked adherent solid infusible film.

Claim 6

A process for forming an infusible resin coating on a predetermined cool, portion of a glass substrate, which process comprises a. applying a film of a first, normally solid, fusible ink composition to said predetermined substrate portion at a temperature above the melting point of said composition and below about 200* F., said composition consisting essentially of (1) 100 parts of a normally solid, fusible epoxy resin which melts at a temperature between about 150* and 165* F. and has an epoxide equivalent of between about 475 and about 525, (2) 20 to 35 parts of cetyl alcohol, (3) 10 to 25 parts of phenyl salicylate, (4) 5 parts dicyandiamide, and (5) 0.5 to 60 percent based on total weight of ink composition of a nonreactive pigment; b. overprinting said coating at a printing temperature below its melting point with a second cold color ink composition which is liquid at said printing temperature and is cocurable with said first ink composition; and c. heating the coated substrate in a curing zone at a temperature between about 375* and 450* F. for a period of from about 3 to 10 minutes.