Compositions – Electrically conductive or emissive compositions – Metal compound containing
Reexamination Certificate
2007-10-16
2007-10-16
Kopec, Mark (Department: 1751)
Compositions
Electrically conductive or emissive compositions
Metal compound containing
C338S0220SD
Reexamination Certificate
active
10535890
ABSTRACT:
A resistor paste comprised of a first glass composition substantially not including lead, a second glass composition substantially not including lead of a composition different from the first glass composition, and a conductive material substantially not including lead mixed with an organic vehicle, further including CuO as an additive in addition to the first glass composition and second glass composition. The first glass composition includes ZnO in an amount of at least 10 mol % and at least one component selected from CaO, SrO, and BaO in an amount of less than 10 mol % (including 0), the second glass composition includes MnO in an amount of at least 5 mol % and at least one component selected from CaO, SrO, and BaO in an amount of at least 10 mol %, and the total percent by volume of the first glass composition and second glass composition is 65 to 89 vol % when the volume of the powder of the total of the conductive material, first glass composition, second glass composition, and additives is 100 and the percent by volume of the conductive material is 8 to 33 vol %. According to the present invention, it is possible to provide a lead-free resistor paste suitable for obtaining a resistor having a predetermined low resistance value while being excellent in the temperature coefficient of resistance (TCR) of resistance value and reliability characteristic (flux resistance) when for example formed on a dielectric substrate having barium titanate as a main ingredient.
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Igarashi Katsuhiko
Tanaka Hirobumi
Kopec Mark
Oliff & Berridg,e PLC
TDK Corporation
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