US5141777A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Highly conductive polymer thick film compositions
Assignee: Acheson Industries Inc
•
Filing: 1991-09-30
•
Granted: 1992-08-25
•
Expires: 2011-09-30
Abstract
Abstract A thermally curable conductive polymer thick film composition comprising, by weight: (a) about 3-15 parts of at least one thermoplastic vinyl acetate/vinyl chloride/dicarboxylic acid multipolymer resin; (b) a second thermoplastic resin selected from the group consisting of: (i) about 1-6 parts of at least one thermoplastic polyurethane resin; (ii) about 2-10 parts of at least one thermoplastic polyester resin; or (iii) about 1-10 parts of a mixture of at least one thermoplastic polyurethane and at least one thermoplastic polyester resin; (c) about 0.05-1 parts of a tertiary amine; (d) an effective amount of at least one organic solvent capable of substantially dissolving (a), (b), and (c) ingredients; and (e) about 50-80 parts of silver flake.
Inventors
- 👤 Richard L. Frentzel
- 👤 Andrew Chen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:22
CPC Classifications
H; H01; H01H; H01H13/00; H01H13/70; H01H13/78; H01H13/785; C; C09; C09D; C09D127/00; C09D127/02; C09D127/04; C09D127/06; C09D5/00; C09D5/24; H01B; H01B1/00; H01B1/20; H01B1/22; H05; H05K; H05K1/00; H05K1/02; H05K1/09; H05K1/092; H05K1/095; H01H13/702; H01H2201/00; H01H2201/022; H01H2201/032
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
150 words
A method of curing a polymer thick film on a substrate comprising the steps of: (1) providing a polymer thick film composition comprising, by weight: (a) about 3-15 pars of at least one thermoplastic vinyl acetate/vinyl chloride/dicarboxylic acid multipolymer resin; (b) a second thermoplastic resin selected from the group consisting of: (i) about 1-6 parts of at least one thermoplastic polyurethane resin; (ii) about 3-10 parts of at least one thermoplastic polyester resin; or (iii) about 1-10 parts of a mixture of at least one thermoplastic polyurethane and at least one polyester resin; (c) about 0.05-1 parts of a tertiary amine; (d) an effective amount of at least one organic solvent capable of substantially dissolving (a), (b), and (c) ingredients; and (e) about 50-80 parts silver flake; (2) applying said composition to a substrate; and (3) curing said composition onto said substrate by exposing the coated substrate to elevated temperatures.
Claim 2
Independent Claim
150 words
A method of curing a polymer thick film on a substrate comprising the steps of: (1) providing a polymer thick film composition comprising, by weight: (a) about 3-15 pars of at least one thermoplastic vinyl acetate/vinyl chloride/dicarboxylic acid multipolymer resin; (b) a second thermoplastic resin selected from the group consisting of: (i) about 1-6 parts of at least one thermoplastic polyurethane resin; (ii) about 3-10 parts of at least one thermoplastic polyester resin; or (iii) about 1-10 parts of a mixture of at least one thermoplastic polyurethane and at least one polyester resin; (c) about 0.05-1 parts of a tertiary amine; (d) an effective amount of at least one organic solvent capable of substantially dissolving (a), (b), and (c) ingredients; and (e) about 50-80 parts silver flake; (2) applying said composition to a substrate; and (3) curing said composition onto said substrate by exposing the coated substrate to elevated temperatures.
Claim 3
Dependent Claim
14 words
The method of claim 1, wherein said applying step (2) is a screen-printing operation.
Claim 4
Dependent Claim
40 words
The method of claim 1, wherein said curing step is carried out in a convention oven at a temperature from about 110° C. to about 150° C. for a period of time from about 5 minutes to about 30 minutes.
Claim 5
Dependent Claim
56 words
The process of claim 1 wherein said solvent is at least one nonhydrocarbon polar organic solvent capable of dissolving the resin system, the amount of said solvent being sufficient to dissolve the resin system and to adjust the viscosity of said polymer thick film composition in order to make it applicable to a membrane switch substrate.
Claim 6
Dependent Claim
28 words
The process of claim 1 wherein the amount of said solvent is from about 20 parts to about 40 parts by weight in said polymer thick film composition.
Claim 7
Dependent Claim
33 words
The process claim 5 wherein said solvent is selected from the group consisting of carbitol, carbitol acetate, butyl carbitol, butyl carbitol acetate, butyolactone, acetone, methyl ethyl ketone, cyclohexanone, dibasic ester solvent, and diglyme.
Claim 8
Dependent Claim
11 words
The process of claim 6 wherein said solvent is carbitol acetate.
Claim 9
Dependent Claim
25 words
The process claim 1 wherein said vinyl acetate/vinyl chloride/dicarboxylic acid multipolymer is a terpolymer of vinyl acetate, vinyl chloride, and an ethylenically unsaturated dicarboxylic acid.
Claim 10
Dependent Claim
26 words
The process of claim 8 wherein said terpolymer of vinyl acetate, vinyl chloride, and an ethylenically unsaturated carboxylic acid is a vinyl acetate/vinyl chloride/maleic acid terpolymer.
Claim 11
Dependent Claim
16 words
The process of claim 1 wherein said polyurethane resin is a linear aliphatic polyester polyurethane resin.
Claim 12
Dependent Claim
15 words
The process of claim 1 wherein said polyester resin is a linear aromatic polyester resin.
Claim 13
Dependent Claim
32 words
The process of claim 1 wherein said tertiary amine is selected from the group consisting of N,N-dimethyl benzylamine, N,N-dimethylaniline, N,N-dimethyltoluidine, N,N-dimethyl-p-anisidine, p-halogen-N,N-dimethylaniline, 2-N-ethylanilino ethanol, tri-n-butylamine, pyridine, quinoline, N-methylvorpholine, triethanolamine, triethylenediamine, N,N,N',N'-tetramethylbutanediamine, N-methylpiperidine.
Claim 14
Dependent Claim
11 words
The process of claim 12 wherein said tertiary amine is triethanolamine.
Claim 15
Dependent Claim
80 words
The process of claim 1 wherein said polymer thick film composition comprises, by weight: (a) about 4.5-10 parts of a thermoplastic vinyl acetate/vinyl chloride/maleic acid tripolymer; (b) a second thermoplastic resin selected from the group consisting of: (1) about 2.5-3.5 parts of a linear aliphatic polyester polyurethane resin; and (2) about 3.5-6 parts of a linear aromatic polyester resin; (c) about 0.1-0.5 parts of triethanolamine; (d) about 25-35 parts of carbitol acetate; and (e) about 55-70 parts of silver flake.
References Cited (Backward Citations)
US4425263A
Cited
US4371459A
Cited
US4552690A
Cited
US4518524A
Cited
US4535012A
Cited
US4595605A
Cited
US4595604A
Cited
US4595606A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-08-25 | 1996-02-24 | 1996-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-25 | 2000-02-24 | 2000-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-25 | 2004-02-24 | 2004-08-25 | $7700.00 | Window Closed / Lapsed |