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US5021802A
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Thermally reversible sol-gel phase change ink or bubble jet ink
Assignee: Ricoh Printing Systems America Inc
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Filing: 1989-04-28
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Granted: 1991-06-04
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Expires: 2009-04-28
Abstract
Abstract Novel impulse ink or bubble jet inks are disclosed which comprise 90-99.9% by weight of aqueous sol-gel medium and 0.1-10% by weight colorant. The inks are thermally reversible sol-gels which are gels at ambient temperatures and sols at temperatures between about 40 DEG -100 DEG C.
Inventors
- 👤 Donald R. Allred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:35
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30; C09D11/34
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
94 words
A method of ink jet printing comprising: (a) providing a thermally reversible aqueous sol-gel ink which is a gel at ambient temperature and a sol at temperatures between about 40° C.-100° C., said ink comprising: (i) 90-99.9% by weight aqueous sol-gel medium which medium is substantially free of syneresis; and (ii) 0.1-10% by weight colorant; (b) elevating the temperature of said ink to between about 40°-100° C. to cause said ink to form a sol; and (c) jetting said ink onto a substrate; whereby said ink forms a gel upon cooling on said substrate.
Claim 2
Independent Claim
94 words
A method of ink jet printing comprising: (a) providing a thermally reversible aqueous sol-gel ink which is a gel at ambient temperature and a sol at temperatures between about 40° C.-100° C., said ink comprising: (i) 90-99.9% by weight aqueous sol-gel medium which medium is substantially free of syneresis; and (ii) 0.1-10% by weight colorant; (b) elevating the temperature of said ink to between about 40°-100° C. to cause said ink to form a sol; and (c) jetting said ink onto a substrate; whereby said ink forms a gel upon cooling on said substrate.
Claim 3
Dependent Claim
13 words
A method according to claim 1 wherein said aqueous sol-gel medium comprises iota-carrageenan.
Claim 4
Dependent Claim
18 words
A method according to claim 2 wherein said aqueous sol-gel medium comprises about 0.25-0.5% by weight of iota-carrageenan.
Claim 5
Dependent Claim
22 words
A method according to claim 1 wherein said ink has a viscosity in the range of about 3-15 cps at 70° C.
Claim 6
Dependent Claim
22 words
A method according to claim 4 wherein said ink has a viscosity in the range of about 4-7 cps at 70° C.
Claim 7
Dependent Claim
22 words
A method according to claim 3 wherein said ink has a viscosity in the range of about 4-7 cps at 70° C.
Claim 8
Dependent Claim
19 words
A method according to claim 1 wherein said ink is jetted using a transducer driven impulse ink jet printer.
Claim 9
Dependent Claim
16 words
A method according to claim 1 wherein said ink is jetted using a bubble style printer.
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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) | 1994-06-03 | 1994-12-03 | 1995-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-03 | 1998-12-03 | 1999-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-03 | 2002-12-03 | 2003-06-04 | $7700.00 | Window Closed / Lapsed |