Manufacturing method of metal paste
First Claim
1. A manufacturing method of a metal paste having a viscosity of 60(Pa·
- s) or larger at a measured value by a rotational viscometer rotating at a shear rate of 2s−
1, or 30(Pa·
s) or larger at the measured value by the rotational viscometer rotating at a shear rate of 10s−
1, comprising;
feeding a paste-like material containing a metal filler into a gap between whetstones which are relatively rotated while facing with each other,kneading, mixing and dispersing the paste-like material containing a metal filler while keeping the temperature of 40°
C. to 80°
C. so that the viscosity of the paste-like material containing a metal filler is within a range of 10 to 40(Pa·
s) measured by the rotational viscometer rotating at a shear rate of 2s−
1, and within a range of 2 to 20(Pa·
s) measured by the rotational viscometer rotating at a shear rate of 10s−
1,and by adjusting a gap interval “
dg”
of the whetstones in a range of (⅕
) “
dm”
to 2 “
dm”
when the gap interval of the whetstones is represented by “
dg” and
a maximum particle size of the metal filler in the paste material is represented by “
dm.”
4 Assignments
0 Petitions
Accused Products
Abstract
A metal paste, in which a filler mainly composed of metal is mixed with good dispersibility, is manufactured with good productivity at a low cost without generating a foil of the metal. A paste-like material (referred to as a paste material hereafter) containing a metal filler is fed into a gap between a pair of rotating whetstones 11 and 12 which are relatively rotated while facing with each other having a specified gap therebetween, to pass and discharge therein. The paste material is thus kneaded and dispersed. In addition, the paste material is kneaded and dispersed by suppressing the generation of a metal foil, adjusting the gap to a specified interval dg and feeding the paste material into the interval while applying thereon a predetermined positive pressure and/or negative pressure.
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Citations
3 Claims
-
1. A manufacturing method of a metal paste having a viscosity of 60(Pa·
- s) or larger at a measured value by a rotational viscometer rotating at a shear rate of 2s−
1, or 30(Pa·
s) or larger at the measured value by the rotational viscometer rotating at a shear rate of 10s−
1, comprising;feeding a paste-like material containing a metal filler into a gap between whetstones which are relatively rotated while facing with each other, kneading, mixing and dispersing the paste-like material containing a metal filler while keeping the temperature of 40°
C. to 80°
C. so that the viscosity of the paste-like material containing a metal filler is within a range of 10 to 40(Pa·
s) measured by the rotational viscometer rotating at a shear rate of 2s−
1, and within a range of 2 to 20(Pa·
s) measured by the rotational viscometer rotating at a shear rate of 10s−
1,and by adjusting a gap interval “
dg”
of the whetstones in a range of (⅕
) “
dm”
to 2 “
dm”
when the gap interval of the whetstones is represented by “
dg” and
a maximum particle size of the metal filler in the paste material is represented by “
dm.” - View Dependent Claims (2, 3)
- s) or larger at a measured value by a rotational viscometer rotating at a shear rate of 2s−
Specification
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- Resources
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Current AssigneeDowa Electronics Materials Co. Ltd. (DOWA Holdings Company Limited)
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Original AssigneeDowa Electronics Materials Co. Ltd. (DOWA Holdings Company Limited)
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InventorsKohayashi, Shuichi, Amasaki, Kazuyoshi, Omoto, Yoshikazu
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Primary Examiner(s)Sorkin; David L
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Application NumberUS11/137,406Publication NumberTime in Patent Office1,237 DaysField of Search241/24.1, 241/257.1, 241/259, 241/296, 241/23, 366/145, 366/286US Class Current366/145CPC Class CodesC01P 2004/61 Micrometer sized, i.e. from...C01P 2006/22 Rheological behaviour as di...C09C 1/646 concomitant with mechanical...
