STRETCHABLE POLYMER THICK FILM SILVER CONDUCTOR FOR HIGHLY PERMEABLE SUBSTRATES
First Claim
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1. An electrical circuit comprising a conductor formed from a polymer thick film conductor composition comprising:
- (a) 30 to 70 wt % silver flakes;
(b) 20 to 50 wt % first organic medium comprising 10 to 50 wt % thermoplastic urethane resin dissolved in a first organic solvent, wherein the weight percent (wt %) of the thermoplastic urethane resin is based on the total weight of the organic medium; and
(c) 5 to 20 wt % second organic medium comprising 10 to 50 wt % thermoplastic polyhydroxyether resin dissolved in a second organic solvent wherein the weight percent of the thermoplastic polyhydroxyether resin is based on the total weight of the organic medium;
wherein the ratio of the weight of the first organic medium to the weight of the second organic medium is about 3;
1, wherein the weight percent of the silver flakes, the first organic medium and the second organic medium are based on the total weight of the polymer thick film conductor composition and wherein the composition is dried to form the conductor on the permeable substrate.
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Abstract
This invention is directed to a polymer thick film conductor composition. The polymer thick film (PTF) conductor composition may be used in applications where significant stretching is required, particularly on highly permeable substrates. A particular type of substrate which is suitable is a woven polyester coated with polyamide. An electrical circuit containing a conductor formed from the composition and a process to make such a circuit are provided.
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Citations
18 Claims
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1. An electrical circuit comprising a conductor formed from a polymer thick film conductor composition comprising:
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(a) 30 to 70 wt % silver flakes; (b) 20 to 50 wt % first organic medium comprising 10 to 50 wt % thermoplastic urethane resin dissolved in a first organic solvent, wherein the weight percent (wt %) of the thermoplastic urethane resin is based on the total weight of the organic medium; and (c) 5 to 20 wt % second organic medium comprising 10 to 50 wt % thermoplastic polyhydroxyether resin dissolved in a second organic solvent wherein the weight percent of the thermoplastic polyhydroxyether resin is based on the total weight of the organic medium; wherein the ratio of the weight of the first organic medium to the weight of the second organic medium is about 3;
1, wherein the weight percent of the silver flakes, the first organic medium and the second organic medium are based on the total weight of the polymer thick film conductor composition and wherein the composition is dried to form the conductor on the permeable substrate.- View Dependent Claims (2, 3, 4, 5, 6)
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7. A process for making an electrical circuit comprising a conductor formed from a thick film conductor composition, comprising the steps of:
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(a) providing a permeable substrate; (b) providing a polymer thick film conductor composition comprising; (iii) 30 to 70 wt % silver flakes; (ii) 20 to 50 wt % first organic medium comprising 10 to 50 wt % thermoplastic urethane resin dissolved in a first organic solvent, wherein the weight percent (wt %) of the thermoplastic;
urethane resin is based on the total weight of the organic medium; and(iii) 5 to 20 wt % second organic medium comprising 10 to 50 wt % thermoplastic polyhydroxyether resin dissolved in a second organic solvent wherein the weight percent of the thermoplastic polyhydroxyether resin is based on the total weight of the organic medium; wherein the ratio of the weight of the first organic medium to the weight of the second organic medium is about 3;
1 and wherein the weight percent of the silver flakes, the first organic medium and the second organic medium are based on the total weight of the polymer thick film conductor composition;(c) depositing said polymer thick film conductor composition onto said permeable substrate; and (d) drying the polymer thick film conductor composition that was deposited in step (c) to form the conductor on the permeable substrate. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A polymer thick film conductor composition comprising:
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(a) 30 to 70 wt % silver flakes (b) 20 to 50 wt % first organic medium comprising 10-50 wt % thermoplastic urethane resin dissolved in a first organic solvent, wherein the weight percent (wt %) of the thermoplastic urethane resin is based on the total weight of the organic medium; and (c) 5 to 20 wt % second organic medium comprising 10-50 wt % thermoplastic polyhydroxyether resin dissolved in a second organic solvent wherein the weight percent of the thermoplastic polyhydroxyether resin is based on the total weight of the organic medium; wherein the ratio of the weight of the first organic medium to the weight of the second organic medium is about 3;
1 and wherein the weight percent of the silver flakes, the first organic medium and the second organic medium are based on the total weight of the polymer thick film conductive composition.- View Dependent Claims (14, 15, 16, 17, 18)
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Specification