US5557308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ink jet print head photoresist layer having durable adhesion characteristics
Assignee: EIDP Inc
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Filing: 1994-07-08
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Granted: 1996-09-17
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Expires: 2014-07-08
Abstract
Abstract The ink jet print head has a sandwich structure of a top plate, a bottom plate, and a dry film photoresist intermediate layer that defines liquid pathways and discharge orifices. The photoresist layer contains a phosphorus compound having substituted or unsubstituted alkyl or aryl groups having 6 to 10 carbons. The ink jet print head photoresist layers containing these phosphorus compounds exhibit durable bonds to the top and bottom plates of the print head and excellent ink resistance.
Inventors
- 👤 Karuppiah Chandrasekaran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:27
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/135; B41J2/16; B41J2/1621; B41J2/1623; B41J2/1631; B41J2/164; B41J2/1646; B41J2202/00; B41J2202/01; B41J2202/03
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
89 words
An ink jet print head having a top plate, an intermediate photoresist layer defining ink passageways, and a bottom plate, the improvement wherein a phosphorus compound is present in the photoresist layer in an amount of approximately 0.01 to 2% by weight, based on total weight of the layer, said phosphorus compound having the formula: ##STR3## wherein R 1 , R 2 and R 3 are substituted or unsubstituted alkyl groups, or substituted or unsubstituted aryl groups having 6 to 10 carbon atoms, and X is oxygen or sulfur.
Claim 2
Dependent Claim
89 words
An ink jet print head having a top plate, an intermediate photoresist layer defining ink passageways, and a bottom plate, the improvement wherein a phosphorus compound is present in the photoresist layer in an amount of approximately 0.01 to 2% by weight, based on total weight of the layer, said phosphorus compound having the formula: ##STR3## wherein R 1 , R 2 and R 3 are substituted or unsubstituted alkyl groups, or substituted or unsubstituted aryl groups having 6 to 10 carbon atoms, and X is oxygen or sulfur.
Claim 3
Dependent Claim
30 words
The print head of claim 1 wherein at least one of said aryl groups is a substituted phenyl group containing a chloride, bromide, iodide, nitrile, hydroxy, alkyl or alkoxy group.
Claim 4
Dependent Claim
45 words
The print head of claim 1 wherein said phosphorus compound is selected from the group consisting of triphenyl phosphine, tricresyl phosphine, triphenyl phosphate, triphenyl phosphine sulfide, triethylphosphine oxide, trimethyl phosphine, tris(chloromethyl) phosphine, tris(trichloromethyl) phosphine, tripentyl phosphate, triethyl phosphate, trimethyl phosphite, triethyl phosphite, and triphenyl phosphite.
Claim 5
Dependent Claim
31 words
The print head of claim 3 wherein said phosphorus compound is present in the amount of approximately 0.05 to 0.5% by weight, based on the total weight of said photoresist layer.
Claim 6
Dependent Claim
26 words
The print head of claim 4 wherein said photoresist layer contains 15 to 50% binder, 5 to 50% monomer, and 0.5 to 10% photoinitiator, by weight.
Claim 7
Dependent Claim
20 words
The print head of claim 5 wherein said photoresist layer contains a half acryloyl ester of bis-phenol A epoxy monomer.
Claim 8
Dependent Claim
16 words
The print head of claim 5 wherein said photoresist layer contains a macromolecular elastomeric water-insoluble binder.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-09-17 | 2000-03-18 | 2000-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-09-17 | 2004-03-18 | 2004-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-09-17 | 2008-03-18 | 2008-09-17 | $7700.00 | Window Closed / Lapsed |