US4026713A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water based magnetic inks and the manufacture thereof
Assignee: International Business Machines Corp
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Filing: 1975-06-12
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Granted: 1977-05-31
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Expires: 1995-06-12
Abstract
Abstract Improvements in water based magnetic inks of the type containing non-ionic, cationic and/or anionic surfactants by the inclusion of glycerol, non-volatile solvent such as mono-lower alkyl ethers of ethylene glycol and low molecular weight polyethylene diols.
Inventors
- 👤 Carlos Juan Sambucetti
- 👤 Joseph William Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:10
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/44; H01F1/442; H01F41/00; H01F41/14; H01F41/16
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
67 words
In an aqueous ferrofluid wherein finely-divided magnetic material is dispersed by surface active agents, the improvement comprising including in said ferrofluid (1) 3 to 12 percent by volume glycerol, (2) 1 to 7 percent by volume of a lower alkyl monoether of ethylene glycol and (3) 2 to 10 percent by volume of polyethylene diol having a molecular weight below about 200 or the monomethyl ether thereof.
Claim 2
Dependent Claim
67 words
In an aqueous ferrofluid wherein finely-divided magnetic material is dispersed by surface active agents, the improvement comprising including in said ferrofluid (1) 3 to 12 percent by volume glycerol, (2) 1 to 7 percent by volume of a lower alkyl monoether of ethylene glycol and (3) 2 to 10 percent by volume of polyethylene diol having a molecular weight below about 200 or the monomethyl ether thereof.
Claim 3
Dependent Claim
25 words
The aqueous ferrofluid of claim 1 wherein said finely-divided magnetic material is coated with an agent to prevent agglomeration thereof prior to dispersion in water.
Claim 4
Dependent Claim
18 words
The aqueous ferrofluid of claim 1 wherein said surface active agents are cationic, nonionic, anionic or mixtures thereof.
Claim 5
Dependent Claim
20 words
The aqueous ferrofluid of claim 3 wherein said surface active agents consist essentially of non-ionic and cationic surface active agents.
Claim 6
Dependent Claim
39 words
The aqueous ferrofluid of claim 1 comprising 8 to 10 percent by volume glycerol, 1 to 5 percent by volume lower alkyl monoether of ethylene glycol and 2 to 8 percent by volume polyethylene diol or monomethyl ether thereof.
Claim 7
Dependent Claim
37 words
The aqueous ferrofluid of claim 1 comprising about 8 percent by volume glycerol, about 4 percent by volume lower alkyl monoether of ethylene glycol and about 5 percent by volume of polyethylene diol or monomethyl ether thereof.
Claim 8
Dependent Claim
23 words
The aqueous ferrofluid of claim 1 wherein the polyethylene diol or monomethyl ether thereof has a molecular weight of about 100 to 200.
Claim 9
Dependent Claim
33 words
The aqueous ferrofluid of claim 1 wherein the lower alkyl monoether of ethylene glycol is selected from the group consisting of ethylene glycol mono-n-butyl ether, ethylene glycol monomethylether and ethylene glycol monoethyl ether.
Claim 10
Dependent Claim
19 words
The aqueous ferrofluid of claim 8 wherein the lower alkyl monoether of ethylene glycol is ethylene glycol mono-n-butyl ether.
Claim 11
Dependent Claim
76 words
In a process for preparing aqueous ferrofluids wherein finely divided magnetic material is dispersed by surface active agents, the improvements comprising adding to said fluid (1) 3 to 12 percent by volume glycerol, (2) 1 to 7 percent by volume lower alkyl monoether of ethylene glycol and (3) 2 to 10 percent by volume polyethylene diol having a molecular weight below about 200 or the monomethyl ether thereof and hot digesting said fluid while containing glycerol.
Claim 12
Dependent Claim
76 words
In a process for preparing aqueous ferrofluids wherein finely divided magnetic material is dispersed by surface active agents, the improvements comprising adding to said fluid (1) 3 to 12 percent by volume glycerol, (2) 1 to 7 percent by volume lower alkyl monoether of ethylene glycol and (3) 2 to 10 percent by volume polyethylene diol having a molecular weight below about 200 or the monomethyl ether thereof and hot digesting said fluid while containing glycerol.
Claim 13
Dependent Claim
24 words
The process of claim 10 wherein said hot digestion is carried out for about 1 to 4 hours at about 60° to 90° C.
Claim 14
Dependent Claim
18 words
The process of claim 10 wherein said hot digestion is carried out for about 1.5 to 2.0 hours.
Claim 15
Dependent Claim
16 words
The process of claim 10 wherein said hot digestion is carried out at about 70° C.
Claim 16
Dependent Claim
24 words
The process of claim 10 wherein said finely-divided magnetic material is coated with an agent to prevent agglomeration thereof prior to dispersion in water.
Claim 17
Dependent Claim
17 words
The process of claim 10 wherein said surface active agents are cationic, nonionic, anionic or mixtures thereof.
Claim 18
Dependent Claim
19 words
The process of claim 10 wherein said surface active agents consist essentially of non-ionic and cationic surface active agents.
Claim 19
Dependent Claim
40 words
The process of claim 10 wherein 8 to 10 percent by volume glycerol, 1 to 5 percent by volume lower alkyl monoether of ethylene glycol and 2 to 8 percent by volume polyethylene diol or monomethyl ether thereof are added.
Claim 20
Dependent Claim
38 words
The process of claim 10 wherein about 8 percent by volume glycerol, about 4 percent by volume lower alkyl monoether of ethylene glycol and about 5 percent by volume of polyethylene diol or monomethyl ether thereof are added.
Claim 21
Dependent Claim
22 words
The process of claim 10 wherein the polyethylene diol or monomethyl ether thereof has a molecular weight of about 100 to 200.
Claim 22
Dependent Claim
32 words
The process of claim 10 wherein the lower alkyl monoether of ethylene glycol is selected from the group consisting of ethylene glycol mono-n-butyl ether, ethylene glycol monomethylether and ethylene glycol monoethyl ether.
Claim 23
Dependent Claim
18 words
The process of claim 10 wherein the lower alkyl monoether of ethylene glycol is ethylene glycol mono-n-butyl ether.
Claim 24
Dependent Claim
13 words
A magnetic ink jet printing composition of the aqueous ferrofluid of claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |