Process for forming solderable polyimide-based polymer thick film conductor
A polyimide and polymer technology, applied in the field of polyimide-based polymer thick film conductors, can solve the problems of non-solder wetting, non-substrate adhesion, etc.
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example 1
[0076] Screen printable Ag compositions were prepared using silver flakes with an average particle size of 3-4 microns. The components of the PTF silver conductor composition are:
[0077]
[0078]
[0079] Where wt% is based on the total weight of the composition. The ratio of the weight of silver to the weight of polyimide is 24.7
[0080] The components were combined and mixed in a Thinky type mixer for 30-60 seconds and then roll milled. This composition is used in Screen printing on 500HPP-ST film figure 1 The 600 square serpentine pattern illustrated in . Using a 325-mesh stainless steel screen, several patterns were printed, and the silver paste was dried at 130° C. for 10 min. The measured line resistance from the sample was 7.7Ω. The average conductor thickness over a 600 square pattern was determined to be 12.7 μm using a profiler. Therefore, the resistivity was calculated to be 6.5 mΩ / □ / mil. Some of the samples cured at 130°C for 10 min were cured aga...
example 2
[0084] Screen printable Ag compositions were prepared using silver flakes with an average particle size of 3-4 microns. The components of the PTF silver conductor composition are:
[0085]
[0086] Where wt% is based on the total weight of the composition. The ratio of the weight of silver to the weight of polyimide was 19.9.
[0087] The components were combined and mixed in a Thinky type mixer for 30-60 seconds and then roll milled. This composition is used in Screen printing on 500HPP-ST film figure 1 The 600 square serpentine pattern illustrated in . Using a 325-mesh stainless steel screen, several patterns were printed, and the silver paste was dried at 130° C. for 10 min. The measured line resistance from the sample was 6.7Ω. The average conductor thickness over a 600 square pattern was determined to be 13.8 μm using a profiler. Therefore, the resistivity was calculated to be 6.3 mΩ / □ / mil. Some of the samples cured at 130°C for 10 min were cured again at 260°...
example 3
[0093] Screen printable Ag compositions were prepared using silver flakes with an average particle size of 3-4 microns. The components of the PTF silver conductor composition are:
[0094] 82.9wt% silver powder
[0095] 2.5wt% Polyimide #1
[0096] 14.6wt% triethyl phosphate
[0097] Where wt% is based on the total weight of the composition. The ratio of the weight of silver to the weight of polyimide was 33.2.
[0098] The components were combined and mixed in a Thinky type mixer for 30-60 seconds and then roll milled. This composition is used in 500HPP-ST, 200RS100 and screen printing on alumina substrates figure 1 The 600 square serpentine pattern illustrated in . Using a 325-mesh stainless steel screen, several patterns were printed, and the silver paste was dried at 130° C. for 10 min. measured from the The line resistances of samples on 500HPP-ST, Kapton 200RS100 and alumina substrates were 10.1, 5.1 and 9Ω, respectively. The average conductor thickness ove...
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