US 10,889,734 B2
Stretchable polymer thick film compositions for thermoplastic substrates and wearables electronics
Michael Zanoni Burrows, Raleigh, NC (US); Mark Steven Critzer, Morrisville, NC (US); and Jay Robert Dorfman, Durham, NC (US)
Assigned to DUPONT ELECTRONICS, INC., Wilmington, DE (US)
Filed by E I DU PONT DE NEMOURS AND COMPANY, Wilmington, DE (US)
Filed on Aug. 8, 2018, as Appl. No. 16/58,394.
Application 16/058,394 is a division of application No. 14/929,498, filed on Nov. 2, 2015, granted, now 10,072,177.
Claims priority of provisional application 62/170,912, filed on Jun. 4, 2015.
Claims priority of provisional application 62/076,006, filed on Nov. 6, 2014.
Prior Publication US 2018/0346758 A1, Dec. 6, 2018
Int. Cl. C09D 175/08 (2006.01); H01B 1/22 (2006.01); H05K 1/09 (2006.01); C09D 5/24 (2006.01); H05K 1/03 (2006.01); C08K 3/08 (2006.01); C08K 3/36 (2006.01); H05K 1/02 (2006.01)
CPC C09D 175/08 (2013.01) [C09D 5/24 (2013.01); H01B 1/22 (2013.01); H05K 1/0326 (2013.01); H05K 1/0346 (2013.01); H05K 1/09 (2013.01); H05K 1/095 (2013.01); C08K 3/08 (2013.01); C08K 3/36 (2013.01); C08K 2003/0806 (2013.01); H05K 1/0283 (2013.01); H05K 2201/0129 (2013.01)] 7 Claims
 
1. An article containing an electrical circuit comprising an element formed from a polymer thick film composition, said polymer thick film composition comprising a functional component and an organic medium, wherein said element is a conductor and wherein said functional component is silver powder in combination with silver chloride powder and said polymer thick film composition is a polymer thick film conductor composition comprising:
(a) silver powder in combination with silver chloride powder; and
(b) the 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; wherein
said composition is dried to remove said solvent and form said conductor.