E.i. Dupont De Nemours and Company

Alfred T Walker

Kenneth Warren Hang

Paul Douglas Vernooy

Marc Henry Labranche

Yuko Ogata

Constance Wenger, Legal Representative

A substantially lead-free thick-film resistor paste composition is disclosed including a resistor composition dispersed in an organic vehicle. The resistor composition includes (a) RuOconductive material; (b) an &#x3b1;-oxide selected from CuO, NaO, KO, LiO and combinations thereof (c) a borosilicate glass composition having: (i) BO, (ii) SiO, (iii) a &#x3b4;-oxide selected from BaO, CaO, ZnO, SrO, MgO and combinations thereof, and optionally including any of (iv) PO, (v) ZrOand (vi) AlO. The CuO &#x3b1;-oxide and TiO, TaO, NbO&#x3b2;-oxide(s) and combinations thereof are present in the paste composition either separately, or in the borosilicate glass composition, or both. The NaO, KO, LiO &#x3b1;-oxide(s) and combinations thereof are present in the borosilicate glass composition. TCR values in the range of +/&#x2212;100 ppm/&#xb0; C. and R values of 100 ohms to 10 mega-ohms per square are obtained by resistors made from the paste composition.

Lead-free resistive composition

A non-lead composition for use as a thick-film resistor paste in electronic applications. The composition comprises particles of LiRuOof diameter between 0.5 and 5 microns and a lead-free frit. The particles have had the lithium at or near primarily the surface of the particle at least partially exchanged for atoms of other metals.

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Oxford, PA, United States of America

Alfred T Walker