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US 6,602,334 B1Granted
Method and ink for producing waterproof markings on plastic surfaces
OwnerRainer Kaufmanninventor
Life of this patent
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Abstract
An ink and a method are disclosed for producing waterproof- and smudge-proof markings and printing on plastic surfaces with an ink formulated to contain a low-volatile solvent with a vapor pressure of less than 20 mbar at 20° C. and a dye dissolved in the solvent which when applied to a plastic material surface absorbs the low-volatile solvent and embeds the dye into the plastic material.
Claims5
An ink solution for producing waterproof markings on a surface of plastic material, comprising:
- a volatile base liquid;
- a low-volatile solvent having a vapor pressure of less than 20 mbar at 20° C. and capable of being absorbed by the plastic material, and
- a solvent dye soluble in the low-volatile solvent, wherein the content of the low-volatile solvent is less than 50 percent by weight and the content of the volatile base liquid is more than 40% by weight.
A method of printing using ink solution comprising a volatile base liquid;
- a low-volatile solvent having a vapor pressure of less than 20 mbar at 20° C. and capable of being absorbed by the plastic material, and a solvent dye soluble in the low-volatile solvent, wherein the content of the low-volatile solvent is less than 50 percent by weight and the content of the volatile base liquid is more than 40% by weight, comprising the step of marking the surface of a plastic selected from the group consisting of cellulose acetate, polyvinyl chloride, polystyrene, polyacrylate, polyamide, polycarbonate, polysulfone, and their derivatives and copolymers.
Dependencies are inferred from the claim text.