US4726845A
Expired / Lapsed
US
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Hybrid marking instrument and writing ink composition
Assignee: Parker Pen Benelux BV
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Filing: 1986-06-04
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Granted: 1988-02-23
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Expires: 2006-06-04
Abstract
Abstract A writing ink composition having a pseudoplasticity index value between about 0.02 and 0.18, a low-shear viscosity between about 25,000 and 120,000 cP, and a high-shear viscosity between about 6 and 26 cP can be used in a hybrid, ball-point marking instrument which combines advantageous features of both paste-ink and liquid-ink ballpens. The writing ink can be prepared using a colloid milling procedure.
Inventors
- 👤 John Thompson
- 👤 Philip Wallis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:29
CPC Classifications
B; B43; B43K; B43K7/00; B43K7/02; B43K1/00; B43K1/08; C; C09; C09D; C09D11/00; C09D11/16; C09D11/18
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
72 words
A writing ink composition comprising (i) an amount of at least one pseudoplastic resin and (ii) a carrier medium for said resin, said amount being such that said ink composition has: (a) a pseudoplasticity index value between about 0.02 and 0.18; (b) a viscosity at 0.1 sec -1 shear rate between about 25,000 and 120,000 cP; and (c) a viscosity at 10,000 sec - shear rate between about 6 and 26 cP.
Claim 2
Dependent Claim
72 words
A writing ink composition comprising (i) an amount of at least one pseudoplastic resin and (ii) a carrier medium for said resin, said amount being such that said ink composition has: (a) a pseudoplasticity index value between about 0.02 and 0.18; (b) a viscosity at 0.1 sec -1 shear rate between about 25,000 and 120,000 cP; and (c) a viscosity at 10,000 sec - shear rate between about 6 and 26 cP.
Claim 3
Dependent Claim
35 words
A writing ink composition according to claim 1, wherein said pseudoplastic resin comprises at least one compound from the group consisting of xanthan gum and a heteropolysaccharide consisting essentially of glucuronic acid, glucose and rhamose.
Claim 4
Dependent Claim
15 words
A writing ink composition according to claim 2 wherein said pseudoplastic resin comprises said heteropolysaccharide.
Claim 5
Dependent Claim
35 words
A writing ink composition according to claim 3, wherein said heteropolysaccharide is present in said ink composition in an amount of greater than 0.15 wt %, relative to the total weight of said ink composition.
Claim 6
Dependent Claim
36 words
A writing ink composition according to claim 4, wherein said heteropolysaccharide is present in said ink composition in an amount between about 0.3 and 0.5 wt %, relative to the total weight of said ink composition.
Claim 7
Dependent Claim
15 words
A writing ink composition according to claim 3, wherein said pseudoplastic resin comprises xanthan gum.
Claim 8
Dependent Claim
35 words
A writing ink composition according to claim 6, wherein said xanthan gum is present in said ink composition in an amount greater than 0.45 wt %, relative to the total weight of said ink composition.
Claim 9
Dependent Claim
26 words
A writing ink composition according to claim 1, wherein said ink has a yield stress value of between about 25 and 120 dyne cm -2 .
Claim 10
Dependent Claim
19 words
A writing ink composition according to claim 1, wherein said pseudoplasticity index value is between about 0.10 and 0.18.
Claim 11
Dependent Claim
24 words
A writing ink composition according to claim 1, wherein said viscosity at 0.1 sec -1 shear rate is between about 25,000 and 75,000 cP.
Claim 12
Dependent Claim
24 words
A writing ink composition according to claim 1, wherein said viscosity at 10,000 sec -1 shear rate is between about 10 and 20 cP.
Claim 13
Dependent Claim
14 words
A writing ink composition according to claim 1, said ink composition being substantially waterless.
Claim 14
Dependent Claim
20 words
A writing ink composition according to claim 1, where said carrier medium comprises water and at least one organic solvent.
Claim 15
Dependent Claim
33 words
A writing ink composition according to claim 4, wherein said organic solvent comprises at least one compound selected from the group consisting of ethylene glycol, glycerol, gamma-butyrolactone, N-methyl pyrrolidone and tetrahydrothiophene 1-1 dioxide.
Claim 16
Dependent Claim
18 words
A writing ink composition according to claim 1, wherein said pseudoplastic resin further comprises a second resin compound.
Claim 17
Dependent Claim
17 words
A writing ink composition according to claim 1, wherein said second resin compound is a cellulose derivative.
Claim 18
Dependent Claim
18 words
A writing ink composition according to claim 15, wherein said second resin compound is a film forming co-resin.
Claim 19
Dependent Claim
13 words
A writing ink composition according to claim 17, wherein said co-resin is polyvinylpyrrolidone.
Claim 20
Dependent Claim
12 words
A writing ink composition according to claim 1, further comprising a surfactant.
Claim 21
Dependent Claim
16 words
A writing ink composition according to claim 19, further comprising an aqueous dispersion of a pigment.
Claim 22
Dependent Claim
20 words
A writing ink composition according to claim 1, wherein said pseudoplastic resin forms a lyophilic sol in said carrier medium.
Claim 23
Independent Claim
184 words
A method for preparing a writing ink composition comprising (i) an amount of at least one pseudoplastic resin and (ii) a carrier medium for said resin, said method comprising the steps of (1) adding a predetermined amount of said pseudoplastic resin to an organic liquid to produce a slurry of said resin in said organic liquid; (2) mixing said slurry with a solvent comprising at least one from the group consisting of water and an organic solvent in which said resin is soluble, said mixing being carried out under sufficiently high shear conditions such that a partially solvated fine dispersion of the resin is produced; and then (3) adding a colorant to said partially solvated fine dispersion and subjecting said partially solvated fine dispersion to hydraulic shear such that a fully solvated lyophilic sol of said resin is produced, said lyophilic sol having (a) a pseudoplasticity index value between about 0.02 and 0.18, (b) a viscosity at 0.1 sec -1 shear rate between about 25,000 and 120,000 cP and (iii) a viscosity at 10,000 sec -1 shear rate between about 6 and 26 cP.
Claim 24
Independent Claim
184 words
A method for preparing a writing ink composition comprising (i) an amount of at least one pseudoplastic resin and (ii) a carrier medium for said resin, said method comprising the steps of (1) adding a predetermined amount of said pseudoplastic resin to an organic liquid to produce a slurry of said resin in said organic liquid; (2) mixing said slurry with a solvent comprising at least one from the group consisting of water and an organic solvent in which said resin is soluble, said mixing being carried out under sufficiently high shear conditions such that a partially solvated fine dispersion of the resin is produced; and then (3) adding a colorant to said partially solvated fine dispersion and subjecting said partially solvated fine dispersion to hydraulic shear such that a fully solvated lyophilic sol of said resin is produced, said lyophilic sol having (a) a pseudoplasticity index value between about 0.02 and 0.18, (b) a viscosity at 0.1 sec -1 shear rate between about 25,000 and 120,000 cP and (iii) a viscosity at 10,000 sec -1 shear rate between about 6 and 26 cP.
Claim 25
Dependent Claim
15 words
A method according to claim 22, where step (2) comprises mixing said dispersion with water.
Claim 26
Dependent Claim
33 words
A method according to claim 22, wherein said pseudoplastic resin comprises at least one compound from the group consisting of xanthan gum and a heteropolysaccharide consisting essentially of glucuronic acid, glucose and rhamose.
Claim 27
Dependent Claim
21 words
A method according to claim 24, wherein said pseudoplastic resin comprises a heteropolysaccharide consisting essentially of glucuronic acid, glucose and rhamose.
References Cited (Backward Citations)
US4483848A
Cited
US4506044A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1991-02-22 | 1991-08-24 | 1992-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-22 | 1995-08-24 | 1996-02-23 | $3760.00 | Window Closed / Lapsed |
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