High-speed printable carbon ink
OwnerRudolf OLDENZIJL, Inge van der Meuleninventors
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Abstract
The present invention relates to an electrically conductive composition comprising a) a resin selected from nitrocellulose, chlorinated polyester, chlorinated polyether, chlorinated polyvinyl, chlorinated polyacetate and mixtures thereof; b) electrically conductive particles comprising graphite and carbon black, wherein ratio of said graphite and said carbon black is from 1:1 to 5:1; and c) a solvent, where in ratio of said electrically conductive particles and said resin is from 0.20:1 to 4:1. The compositions according to the present invention can be used in high-speed printing techniques such as flexography and rotogravure printing.
Claims22
An electrically conductive composition comprising:
- (a) a resin selected from the group consisting of nitrocellulose, chlorinated polyester, chlorinated polyether, chlorinated polyvinyl, chlorinated polyacetate and mixtures thereof;
- (b) electrically conductive particles comprising graphite and carbon black, wherein ratio of said graphite and said carbon black is from 1:1 to 5:1;
- and
- (c) a solvent,
- wherein the ratio of said electrically conductive particles and said resin is from 0.20:1 to 4:1.
The electrically conductive composition according to claim 1, wherein said carbon black has (a) an oil absorption number from 70 ml/100g to 500 ml/100g, and/or
- (b) specific surface area from 30 m2/g to 1400 m2/g,
- wherein said oil absorption number is measured according to ASTM D2414, and wherein said specific surface area is measured according by BET.
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A method of forming an electrically conductive film comprising:
- (a) preparing an electrically conductive ink comprising (i) a resin selected from the group consisting of nitrocellulose, chlorinated polyester, chlorinated polyether, chlorinated polyvinyl, chlorinated polyacetate and mixtures thereof;
- (ii) electrically conductive particles comprising graphite and carbon black, wherein ratio of said graphite and said carbon black is from 1:1 to 5:1;
- and (iii) a solvent;
- wherein the ratio of said electrically conductive particles and said resin is from 0.20:1 to 4:1;
- wherein the electrically conductive ink has viscosity from 600 to 5000 mPas, measured by Brookfield (Dy-I prime), spindle #2 at 20, at room temperature;
- (b) preparing a substrate;
- (c) further diluting the prepared electrically conductive ink with an additional solvent, wherein the diluted electrically conductive ink has a solvent content in the range of 20 to 70 wt %;
- (d) printing the diluted electrically conductive ink onto the substrate;
- and
- (e) drying the electrically conductive ink;
- whereby forming the electrically conductive film.
Dependencies are inferred from the claim text.