US4096061A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery and reuse of paint solids from waste water
Assignee: Ashland Inc
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Filing: 1977-01-05
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Granted: 1978-06-20
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Expires: 1997-01-05
Abstract
Abstract A latex base paint waste water containing dispersed paint solids is clarified by flocculating the paint solids with a cationic flocculant. The separated paint sludge is brought to an alkaline pH and treated with an anionic dispersing agent whereby the sludge can be used in the formulation of a latex base paint.
Inventors
- 👤 Thomas P. Brennan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:13
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/54; C02F1/56; C08; C08J; C08J11/00; C09; C09D; C09D7/00; C09D7/71; C02F2103/00; C02F2103/14; C02F2209/00; C02F2209/06; C02F2301/00; C02F2301/08; C02F2303/00; C02F2303/16
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
100 words
In the clarification of a latex base paint waste water, containing dispersed paint solids by flocculating the paint solids with a cationic flocculant to separate a clarified supernatant from a paint solid sludge, an improved process for recovering and reusing paint solids, comprising: adding an anionic dispersant to said paint solid sludge and maintaining said paint solid sludge at an alkaline pH, said anionic dispersant being added in an amount to neutralize the effect of said cationic flocculant; and dispersing said paint solid sludge in an effective amount of latex paint base for the production of a latex base paint.
Claim 2
Dependent Claim
100 words
In the clarification of a latex base paint waste water, containing dispersed paint solids by flocculating the paint solids with a cationic flocculant to separate a clarified supernatant from a paint solid sludge, an improved process for recovering and reusing paint solids, comprising: adding an anionic dispersant to said paint solid sludge and maintaining said paint solid sludge at an alkaline pH, said anionic dispersant being added in an amount to neutralize the effect of said cationic flocculant; and dispersing said paint solid sludge in an effective amount of latex paint base for the production of a latex base paint.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein the anionic dispersant is added in an amount of from 0.1% to 2.0%, by weight.
Claim 4
Dependent Claim
13 words
The process of claim 2 wherein the alkaline pH is at least 8.5.
Claim 5
Dependent Claim
35 words
The process of claim 3 wherein said anionic dispersant is at least one member selected from the group consisting of polymaleic anhydride, copolymers of maleic anhydride with an olefin, polyacrylic acid and alkyl naphthalene sulfonates.
Claim 6
Dependent Claim
21 words
The process of claim 4 wherein the cationic flocculant is employed in an amount of from 0.1% to 1.0%, by weight.
Claim 7
Dependent Claim
23 words
The process of claim 5 wherein said cationic flocculant is at least one member selected from the group consisting of polyamines and polyvinylimidazoline.
Claim 8
Dependent Claim
18 words
The process of claim 6 wherein the flocculating is effected at a pH of from 6.5 to 7.5.
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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) | 1981-06-19 | 1981-12-19 | 1982-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-19 | 1985-12-19 | 1986-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-19 | 1989-12-19 | 1990-06-20 | $7700.00 | Window Closed / Lapsed |