Conductive ink
AssigneeDsm IP Assets B.V.
InventorsGerardus Cornelis Overbreek, Michael Arnoldus Jacobus Schellekens, Alfred Jean Paul Buckmann
Life of this patent
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Abstract
A conductive ink comprising 10 to 75 wt % of at least one solvent comprising ≦20 wt % water; 0 to 50 wt % of at least one radiation curable material having a Mn in the range of from 50 to 10,000 g/mol; 5 to 70 wt % of at least one polyurethane having a Mw in the range of from 4,000 to 70,000 g/mol, 0 to 5 wt % of isocyanate-reactive component(s) bearing ionic or potentially ionic water-dispersing groups and a free isocyanate group content <0.5 wt % and 20 to 85 wt % of a conductive material.
Claims20
A conductive ink comprising:
- (a) 10 to 75 wt % of at least one solvent comprising ≦20 wt % water;
- (b) 0 to 50 wt % of at least one radiation curable material having a Mn in the range of from 50 to 10,000 g/mol;
- (c) 5 to 70 wt % of at least one polyurethane:
- (i) having a Mw in the range of from 4,000 to 70,000 g/mol;
- (ii) having 0 to 5 wt % or isocyanate-reactive component(s) bearing ionic or potentially ionic water-dispersing groups;
- (iii) having a free isocyanate group content <0.5 wt %;
- (d) 20 to 85 wt % of a conductive material and
- wherein (a), (b), (c) and (d) add up to 100%, and
- the conductive ink having a resolubility within 30 seconds.
A conductive ink comprising:
- (a) 10 to 75 wt % of at least one solvent comprising <1 wt % of water;
- (b) 0 to 50 wt % of at least one radiation curable material:
- (i) having a Mn in the range of from 550 to 3500 g/mol;
- (ii) having an average acrylate function in the range of from 2 to 5;
- (c) 5 to 70 wt % of at least one polyurethane:
- (i) having a Mw in the range of from 6,000 to 55,000 g/mol;
- (ii) having 0 to 5 wt % of isocyanate-reactive component(s) bearing ionic or potentially ionic water-dispersing groups;
- (iii) having a non-detectable free isocyanate group content;
- (iv) having 0 to 0.1 mol of C═C bonds per 100 g;
- and
- (d) 20 to 85 wt % of a conductive material selected from silver particulate materials, silver flake materials, copper particulate materials, copper flake materials, silver coated particulate materials, silver coated flake like materials, silver coated fibres, silver coated nanotubes and mixtures thereof;
- and wherein (a), (b), (c) and (d) add up to 100%.
A conductive layer with a thickness in the range of from 2 to 20 microns and a surface resistivity <1.5 Ohm per square obtained from a conductive ink composition applied to a substrate which is dried with a drying profile comprising the steps:
- (i) pre-drying (flash-off) at 70 to 200° C. from 5 seconds for up to 5 minutes;
- and
- (ii) drying at 80 to 200° C. for 5 to 60 minutes, more preferably 10 to 30 minutes the ink composition comprising:
- (a) 10 to 75 wt % of at least one solvent comprising <1 wt % of water;
- (b) 0 to 50 wt % of at least one radiation curable material:
- (i) having a Mn in the range of from 550 to 3500 g/mol;
- (ii) having an average acrylate function in the range of from 2 to 5;
- (c) 5 to 70 wt % of at least one polyurethane:
- (i) having a Mw in the range of from 6,000 to 55,000 g/mol;
- (ii) having 0 to 5 wt % of isocyanate-reactive component(s) bearing ionic or potentially ionic water-dispersing groups;
- (iii) having a non-detectable free isocyanate group content;
- (iv) having 0 to 0.1 mol of 0=0 bonds per 100 g;
- and
- (d) 20 to 85 wt % of a conductive material selected from silver particulate materials, silver flake materials, copper particulate materials, copper flake materials, silver coated particulate materials, silver coated flake like materials, silver coated fibres, silver coated nanotubes and mixtures thereof;
- and
- wherein (a), (b), (c) and (d) add up to 100%, and the conductive ink having a resolubility within 30 seconds.
(canceled)
Dependencies are inferred from the claim text.