US3941688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for separation of mixture of polyester and cellulose derivative
Assignee: Mitsui Kinzoku Co Ltd
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Filing: 1974-05-14
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Granted: 1976-03-02
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Expires: 1994-05-14
Abstract
Abstract A method for the separation of a mixture of a polyester and a cellulose derivative comprising introducing gas bubbles into an aqueous liquid medium containing the mixture of the polyester and the cellulose derivative, optionally in the presence of at least one wetting agent and at least one flotation agent thereby separating the mixture by flotation into the polyester and the cellulose derivative.
Inventors
- 👤 Kozo Saitoh
- 👤 Sumio Izumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:58
CPC Classifications
C; C08; C08J; C08J11/00; C08J11/04; C08J11/06; B; B03; B03D; B03D1/00; B03D1/02; B29; B29B; B29B17/00; B29B17/02; B03D1/06; B29B2017/0203; B29B2017/0213; B29B2017/0217; B29B2017/0248; B29K; B29K2001/00; B29K2067/00; B29L; B29L2031/00; B29L2031/764; B29L2031/7644; C08J2301/00; C08J2301/08; C08J2301/10; C08J2301/12; C08J2367/00; C08J2367/02; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/62
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
116 words
A method for the separation of a mixture of a polyester and a cellulose derivative selected from the group consisting of cellulose diacetate, cellulose triacetate and nitrocellulose comprising introducing gas bubbles into a dispersion of a mixture of said polyester and said cellulose derivative, said polyester and said cellulose derivative being solid pieces having a size of 1 to 50 mm, in an aqueous liquid medium in the presence of at least one wetting agent to render the surfaces of the polyester pieces more hydrophilic than the surfaces of the cellulose derivative pieces and at least one flotation agent, whereby said cellulose derivative is floated thereby separating said mixture into said polyester and said cellulose derivative.
Claim 2
Independent Claim
116 words
A method for the separation of a mixture of a polyester and a cellulose derivative selected from the group consisting of cellulose diacetate, cellulose triacetate and nitrocellulose comprising introducing gas bubbles into a dispersion of a mixture of said polyester and said cellulose derivative, said polyester and said cellulose derivative being solid pieces having a size of 1 to 50 mm, in an aqueous liquid medium in the presence of at least one wetting agent to render the surfaces of the polyester pieces more hydrophilic than the surfaces of the cellulose derivative pieces and at least one flotation agent, whereby said cellulose derivative is floated thereby separating said mixture into said polyester and said cellulose derivative.
Claim 3
Dependent Claim
25 words
The method as claimed in claim 1, wherein said polyester is polyethylene terephthalate, an alkyd resin, an unsaturated polyester resin or a maleic acid resin.
Claim 4
Dependent Claim
30 words
The method as claimed in claim 1, wherein said wetting agent is an alkali metal lignin sulfonate, an alkaline earth metal lignin sulfonate, an organic colloid, or a mixture thereof.
Claim 5
Dependent Claim
30 words
The method as claimed in claim 3, wherein said wetting agent is sodium lignin sulfonate, calcium lignin sulfonate, tannic acid, a quebracho extract, gelatin, glue, saponin or a mixture thereof.
Claim 6
Dependent Claim
25 words
The method as claimed in claim 3, wherein the amount of said wetting agent is up to about 1,000 g per ton of said mixture.
Claim 7
Dependent Claim
33 words
The method as claimed in claim 1, wherein said flotation agent is pine oil, kerosene, cresylic acid, eucalyptus oil, camphor oil, a higher alcohol, methyl isobutyl carbinol, pyridine, o-toluidine, or a mixture thereof.
Claim 8
Dependent Claim
25 words
The method as claimed in claim 6, wherein the amount of said flotation agent is up to about 1,000 g per ton of said mixture.
Claim 9
Dependent Claim
32 words
The method as claimed in claim 1, wherein the amount of said mixture is about 0.1 to about 10 parts by weight per 100 parts by weight of said aqueous liquid medium,
Claim 10
Dependent Claim
17 words
The method as claimed in claim 1, wherein said aqueous liquid medium is water or salt water.
References Cited (Backward Citations)
CA699582A
Cited
DE502730C
Cited
GB940250A
Cited
US3154255A
Cited
US3248277A
Cited
US3574050A
Cited
US3408255A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |