Stretchable polymer thick film compositions for thermoplastic substrates and wearables electronics
First Claim
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1. A polymer thick film metal conductor paste composition comprising:
- (a) an electrically conductive metal powder, wherein said metal is selected from the group consisting of Ag, Cu, Au, Pd, Pt, Sn, Al, Ni, an alloy of Ag, Cu, Au, Pd, Pt, Sn, Al, Ni and mixtures thereof; and
(b) an organic medium comprising 5-50 wt % thermoplastic polyurethane resin dissolved in an organic solvent, said thermoplastic polyurethane resin having a percent elongation of at least 200% and a tensile stress necessary to achieve 100% elongation of less than 1000 psi, wherein the weight percent is based on the total weight of said organic medium.
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Abstract
This invention is directed to stretchable polymer thick film compositions useful for wearable garments. More specifically, the polymer thick film may be used in applications where significant stretching is required, particularly on substrates that can be highly elongated. A particular type of substrate is a thermoplastic polyurethane substrate.
15 Citations
9 Claims
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1. A polymer thick film metal conductor paste composition comprising:
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(a) an electrically conductive metal powder, wherein said metal is selected from the group consisting of Ag, Cu, Au, Pd, Pt, Sn, Al, Ni, an alloy of Ag, Cu, Au, Pd, Pt, Sn, Al, Ni and mixtures thereof; and (b) an organic medium comprising 5-50 wt % thermoplastic polyurethane resin dissolved in an organic solvent, said thermoplastic polyurethane resin having a percent elongation of at least 200% and a tensile stress necessary to achieve 100% elongation of less than 1000 psi, wherein the weight percent is based on the total weight of said organic medium. - View Dependent Claims (2, 3, 4)
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5. A polymer thick film silver/silver chloride conductor paste composition comprising:
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(a) silver powder in combination with silver chloride powder; and (b) an organic medium comprising 5-50 wt % thermoplastic polyurethane resin dissolved in an organic solvent, said thermoplastic polyurethane resin having a percent elongation of at least 200% and a tensile stress necessary to achieve 100% elongation of less than 1000 psi, wherein the weight percent is based on the total weight of said organic medium. - View Dependent Claims (6, 7)
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8. A polymer thick film carbon paste composition comprising:
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(a) graphite, conductive carbon or a mixture thereof; and (b) an organic medium comprising 5-50wt % thermoplastic polyurethane resin dissolved in an organic solvent, said thermoplastic polyurethane resin having a percent elongation of at least 200% and a tensile stress necessary to achieve 100% elongation of less than 1000 psi, wherein the weight percent is based on the total weight of said organic medium. - View Dependent Claims (9)
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Specification