Method and devices for high temperature thick film pastes

Patent metadata

Field	Value
Publication number	US-2016183328-A1
Application number	US-201514972840-A
Country	US
Kind code	A1
Filing date	Dec 17, 2015
Priority date	Dec 17, 2014
Publication date	Jun 23, 2016
Grant date	—

Abstract

The present invention relates to the design, construction and manufacture of a novel electrical high temperature heater having a polymer thick film conductor paste with which to form an electrode on resistive film.

First claim

What is claimed is:

1 . A process to prepare a high temperature heater comprising:
a. preparing an electrically conductive paste, capable of high in use operating temperature; b. applying the electrically conductive paste to form an electrode on an electrically resistive polyimide film, and c. attaching a power source to the electrically conductive electrode,
wherein the electrically conductive high in use operating temperature paste comprises a polyimide resin represented by formula I:

wherein X is C(CH3)2, O, S(O)2 or C(CF3)2, O-Ph-C(CH 3 ) 2 -Ph-O, O-Ph-O— or a mixture of two, or more of C(CH3)2, O, S(O)2, and C(CF3)2, O-Ph-C(CH 3 ) 2 -Ph-O, O-Ph-O—;
wherein Y is diamine component or mixture of diamine components selected from the group consisting of:
m-phenylenediamine (MPD),
3,4′-diaminodiphenyl ether (3,4′-ODA),
4,4′-diamino-2,2′-bis(trifluoromethyl)biphenyl (TFMB),
3,3′-diaminodiphenyl sulfone (3,3′-DDS),
4,4′-(Hexafluoroisopropylidene)bis(2-aminophenol) (6F-AP)
bis-(4-(4-aminophenoxy)phenyl)sulfone (BAPS) and
9,9-bis(4-aminophenyl)fluorene (FDA);

2,3,5,6-tetramethyl-1,4-phenylenediamine (DAM), 2,2-bis[4-(4-aminophenoxyphenyl)]propane (BAPP), 2,2-bis[4-(4-aminophenoxyphenyl)] hexafluoropropane (HFBAPP), 1,3-bis(3-aminophenoxy) benzene (APB-133), 2,2-bis(3-aminophenyl)hexafluoropropane, 2,2-bis(4-aminophenyl)hexafluoropropane (Bis-A-AF), 4,4′-bis(4-amino-2-trifluoromethylphenoxy) biphenyl, 4,4′-[1,3-phenylenebis(1-methyl-ethylidene)] bisaniline (Bisaniline-M)
with the proviso that:
i. if X is O, then Y is not m-phenylenediamine (MPD), bis-(4-(4-aminophenoxy)phenyl)sulfone (BAPS) and 3,4′-diaminodiphenyl ether (3,4′-ODA); BAPP, APB-133, Bisaniline-M
ii. if X is S(O) 2 , then Y is not 3,3′-diaminodiphenyl sulfone (3,3′-DDS);
iii. if X is C(CF 3 ) 2 , then Y is not m-phenylenediamine (MPD), bis-(4-(4-aminophenoxy)phenyl)sulfone (BAPS), 9,9-bis(4-aminophenyl)fluorene (FDA), and 3,3′-diaminodiphenyl sulfone (3,3′-DDS);
iv. if X is O-Ph-C(CH 3 ) 2 -Ph-O or O-Ph-O—, then Y is not m-phenylene diamine (MPD), FDA, 3,4′-ODA, DAM, BAPP, APB-133, bisaniline-M dissolved in a solvent suited to screen printing, with an electrically conductive metal powder dispersed to from a screen printable tick film paste.

2 . A high operating temperature heater made using the process of claim 1 .

3 . The high operating temperature heater of claim 2 , wherein the temperature of the high operating temperature heater operates in the range of room temperature to 210° C.

4 . The high operating temperature heater of claim 2 , wherein the electrically conductive electrode further comprises inorganic fillers selected from the group consisting of Au, Ag, Cu, Pd, Pt, Ni, Al, Ag coated Cu and mixture thereof.

5 . The electrically conductive electrode of claim 2 , wherein the electrically conductive electrode paste further comprises an inorganic filler of Ag in the amount of 40 to 80 wt % of the paste having a dried and cured thickness of 4 to 100 microns and an electrical resistivity 4 to 70 mohms/sq/mil.

6 . The high temperature heater capable of high in use operating temperature of claim 5 , wherein the resistance of the heater utilizing a film like Kapton® 200RS100 defined and constructed through the positioning, size, and spacing of the electrodes on the electrically resistive film to form an electrical resistance which is desired for the particular application.

7 . A heater or heating device for:
a. a base portion having chamber section; b. a high temperature heater contacting the chamber section; c. a power source for the high temperature heater; and d. a lid for the chamber section,
wherein the electrically resistive high temperature heater paste comprises a polyimide represented by formula I:

wherein X is C(CH3)2, O, S(O)2 or C(CF3)2, O-Ph-C(CH 3 ) 2 -Ph-O, O-Ph-O— or a mixture of two, or more of C(CH3)2, O, S(O)2, and C(CF3)2, O-Ph-C(CH 3 ) 2 -Ph-O, O-Ph-O—;
wherein Y is diamine component or mixture of diamine components selected from the group consisting of:
m-phenylenediamine (MPD),
3,4′-diaminodiphenyl ether (3,4′-ODA),
4,4′-diamino-2,2′-bis(trifluoromethyl)biphenyl (TFMB),
3,3′-diaminodiphenyl sulfone (3,3′-DDS),
4,4′-(Hexafluoroisopropylidene)bis(2-aminophenol) (6F-AP)
bis-(4-(4-aminophenoxy)phenyl)sulfone (BAPS) and
9,9-bis(4-aminophenyl)fluorene (FDA);

2,3,5,6-tetramethyl-1,4-phenylenediamine (DAM), 2,2-bis[4-(4-aminophenoxyphenyl)]propane (BAPP), 2,2-bis[4-(4-aminophenoxyphenyl)] hexafluoropropane (HFBAPP), 1,3-bis(3-aminophenoxy) benzene (APB-133), 2,2-bis(3-aminophenyl)hexafluoropropane, 2,2-bis(4-aminophenyl)hexafluoropropane (Bis-A-AF), 4,4′-bis(4-amino-2-trifluoromethylphenoxy) biphenyl, 4,4′-[1,3-phenylenebis(1-methyl-ethylidene)] bisaniline (Bisaniline-M)
with the proviso that:
i. if X is O, then Y is not m-phenylenediamine (MPD), bis-(4-(4-aminophenoxy)phenyl)sulfone (BAPS) and 3,4′-diaminodiphenyl ether (3,4′-ODA); BAPP, APB-133, Bisaniline-M
ii. if X is S(O) 2 , then Y is not 3,3′-diaminodiphenyl sulfone (3,3′-DDS);
iii. if X is C(CF 3 ) 2 , then Y is not m-phenylenediamine (MPD), bis-(4-(4-aminophenoxy)phenyl)sulfone (BAPS), 9,9-bis(4-aminophenyl)fluorene (FDA), and 3,3′-diaminodiphenyl sulfone (3,3′-DDS);
iv. if X is O-Ph-C(CH 3 ) 2 -Ph-O or O-Ph-O—, then Y is not m-phenylene diamine (MPD), FDA, 3,4′-ODA, DAM, BAPP, APB-133, bisaniline-M.

Assignees

• Du Pont

Inventors

• Pepin John Graeme
• Summers John Donald
• Suh Seigi
• Roberts Kurt Douglas
• Glenn Danny E

Classifications

• H01C17/06526 Primary

  composed of metals · CPC title

• H05B3/10

  Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor · CPC title

• H01C17/283

  Precursor compositions therefor, e.g. pastes, inks, glass frits · CPC title

• H05B3/34

  flexible, e.g. heating nets or webs · CPC title

• H05B3/03 Primary

  Electrodes · CPC title