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US5151155A
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Process for deinking wastepaper with organically modified smectite clay
Assignee: Elementis Specialties Inc
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Filing: 1991-05-09
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Granted: 1992-09-29
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Expires: 2011-05-09
Abstract
Abstract A process for deinking wastepaper with an aqueous system, which includes: (a) contacting wastepaper with an aqueous system which contains an agent of one or more organically modified smectite-type clays; and (b) recovering deinked paper pulp from the aqueous system.
Inventors
- 👤 Charles A. Cody
- 👤 Edward D. Magauran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:54
CPC Classifications
D; D21; D21C; D21C5/00; D21C5/02; D21C5/025; D21C5/027; C; C01; C01B; C01B39/00; C01B39/02; C01B39/44; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/64
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
47 words
A process for deinking wastepaper, which comprises: (a) contacting wastepaper with an aqueous system which contains an agent in an amount effective to deink the wastepaper, wherein the agent comprises: one or more organically modified smectite-type clays; and (b) recovering deinked paper pulp from the aqueous system.
Claim 2
Dependent Claim
47 words
A process for deinking wastepaper, which comprises: (a) contacting wastepaper with an aqueous system which contains an agent in an amount effective to deink the wastepaper, wherein the agent comprises: one or more organically modified smectite-type clays; and (b) recovering deinked paper pulp from the aqueous system.
Claim 3
Dependent Claim
30 words
The process of claim 1, wherein said agent is present in an amount of from about 0.05% to about 50% by weight, based on the dry weight of said wastepaper.
Claim 4
Dependent Claim
24 words
The process of claim 1, wherein said wastepaper is selected from the group consisting of newspaper, magazines, computer paper, legal documents and book stock.
Claim 5
Dependent Claim
15 words
The process of claim 1, wherein said wastepaper contains a water-based or an oil-based ink.
Claim 6
Dependent Claim
28 words
The process of claim 1, wherein the recovering step includes air sparging in order to float ink removed from the wastepaper to the surface of the aqueous system.
Claim 7
Dependent Claim
62 words
The process of claim 1, wherein said organically modified smectite-type clay comprises the reaction product of: (a) a smectite-type clay having a cation exchange capacity of at least 50 milliequivalents per 100 grams of clay; and (b) one or more quaternary ammonium salts in an amount of from about 40% to about 200% of the cation exchange capacity of the smectite-type clay.
Claim 8
Dependent Claim
19 words
The process of claim 6, wherein said smectite-type clay is sheared prior to reaction with said quaternary ammonium salt.
Claim 9
Dependent Claim
23 words
The process of claim 1, wherein said organically modified smectite-type clay is in aqueous slurry form prior to addition to the aqueous system.
Claim 10
Dependent Claim
23 words
The process of claim 1, wherein said organically modified smectite-type clay is in dry powdered form prior to addition to the aqueous system.
Claim 11
Dependent Claim
11 words
The process of claim 1, wherein said wastepaper contains tacky contaminants.
Claim 12
Dependent Claim
27 words
The process of claim 1, wherein said agent comprises a mixture of at least one hydrophobic organically modified clay with at least one hydrophilic organically modified clay.
Claim 13
Dependent Claim
25 words
The process of claim 1, wherein said agent comprises an organically modified clay formed with a quaternary ammonium salt having both hydrophobic and hydrophilic groups.
Claim 14
Dependent Claim
24 words
The process of claim 1, wherein the recovery step includes floatation of ink removed from the wastepaper to the surface of the aqueous system.
Claim 15
Dependent Claim
22 words
The process of claim 13, wherein said agent comprises a reaction product of crude hectorite clay and methyl trihydrogenated tallow ammonium chloride.
Claim 16
Dependent Claim
16 words
The process of claim 1, wherein the recovery step includes water washing the deinked paper pulp.
Claim 17
Dependent Claim
19 words
The process of claim 15, wherein said agent comprises a reaction product of crude hectorite clay and octadecyl-methyl-ammonium chloride.
Claim 18
Dependent Claim
48 words
The process of claim 1, wherein said organically modified smectite-type clay is the reaction product of (a) a smectite-type clay selected from the group consisting of crude hectorite, crude bentonite, beneficiated hectorite, beneficiated bentonite, spray dried hectorite and mixtures thereof; and (b) one or more quaternary ammonium salts.
Claim 19
Dependent Claim
32 words
The process of claim 1, wherein the recovery step includes floatation of ink removed from the wastepaper to the surface of the aqueous system, and water washing of the deinked paper pulp.
References Cited (Backward Citations)
US1421195A
Cited
US1659401A
Cited
US3501373A
Cited
US3801433A
Cited
GB1375161A
Cited
US4013505A
Cited
US3932206A
Cited
SU926129A1
Cited
US4264412A
Cited
JPS59150191A
Cited
US4710267A
Cited
US4618400A
Cited
US4608123A
Cited
US4680088A
Cited
US4666558A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-09-29 | 1996-03-30 | 1996-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-29 | 2000-03-30 | 2000-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-29 | 2004-03-30 | 2004-09-29 | $7700.00 | Window Closed / Lapsed |