E.i. Dupont De Nemours and Company

Yuko Ogata

Kenneth Warren Hang

Marc Henry Labranche

Keiichiro Hayakawa

Jerome David Smith

Alfred T Walker

Constance Wenger, Legal Representative

A method of manufacturing a resistor paste comprising steps of: (a) preparing a basic resistor paste comprising, (i) a conductive powder, (ii) a first glass frit, and (iii) a first organic medium; and (b) preparing a glass paste as a TCR driver comprising, (iv) a second glass frit comprising manganese oxide, and (v) a second organic medium, (c) adding the glass paste to the basic resistor paste to obtain a resistor paste with a desired TCR.

Method of manufacturing a resistor paste

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

This invention relates to a composition using a ruthenium oxide and/or a polynary ruthenium oxide as conducting components and using a Cu containing glass frit.

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Tochigi, Japan

Yuko Ogata