US4299952A
Expired / Lapsed
US
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Method for recovering synthetic resinous latex solids
Assignee: DIAMOND TECHNOLOGY PARTNERSHIP Co
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Filing: 1980-03-24
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Granted: 1981-11-10
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Expires: 2000-03-24
Abstract
Abstract Latex is shear coagulated to form a paste, the paste heated and sheared to form a desired crumb; the crumb is mechanically dewatered and ground to a desired particle size. Relatively low energy consumption is a feature of the process.
Inventors
- 👤 Ronald J. Pingel
- 👤 Geofrey P. Onifer
- 👤 Thomas L. Spencer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:16
CPC Classifications
B; B29; B29B; B29B17/00; B29B13/00; B29B13/06; B29B15/00; B29B15/02; B29B15/04; B29B7/00; B29B7/002; B29B7/007; C; C08; C08C; C08C1/00; C08C1/14; C08F; C08F6/00; C08F6/14; C08F6/22; B29K; B29K2021/00; B29K2105/00; B29K2105/0058; B29K2105/0064; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/62; Y10; Y10S; Y10S528/00; Y10S528/931; Y10S528/934; Y10S528/936
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
143 words
A process for the recovery of synthetic resinous thermoplastic latex solids from a latex, the steps of the method comprising providing a latex of a synthetic resinous thermoplastic polymer, the latex containing from about 10 to about 50 weight percent solids, subjecting the latex to mechanical shear sufficient to transform the latex into a paste-like mass, admixing the paste-like mass with steam under a pressure of from about 25 to 400 pounds per square inch with mechanical shear provided by the admixture of steam with said mass to thereby heat the paste-like mass above the softening point of the polymer and form a plurality of macro particles of which at least 90 weight percent are retained on an 80 mesh U.S. Sieve size screen and subsequently subjecting said macro particles to mechanical working to expel at least a majority of water associated therewith.
Claim 2
Dependent Claim
143 words
A process for the recovery of synthetic resinous thermoplastic latex solids from a latex, the steps of the method comprising providing a latex of a synthetic resinous thermoplastic polymer, the latex containing from about 10 to about 50 weight percent solids, subjecting the latex to mechanical shear sufficient to transform the latex into a paste-like mass, admixing the paste-like mass with steam under a pressure of from about 25 to 400 pounds per square inch with mechanical shear provided by the admixture of steam with said mass to thereby heat the paste-like mass above the softening point of the polymer and form a plurality of macro particles of which at least 90 weight percent are retained on an 80 mesh U.S. Sieve size screen and subsequently subjecting said macro particles to mechanical working to expel at least a majority of water associated therewith.
Claim 3
Dependent Claim
15 words
The method of claim 1 wherein the latex has polymerized therein styrene, acrylonitrile and rubber.
Claim 4
Dependent Claim
23 words
The method of claim 1 wherein the plurality of macro particles are passed through a fluid operated pinch valve prior to mechanical working.
Claim 5
Dependent Claim
153 words
A process for the recovery of synthetic resinous thermoplastic latex solids from a latex, the steps of the method comprising providing a latex of a synthetic resinous thermoplastic polymer, the latex containing from about 10 to about 50 weight percent solids, subjecting the latex at a temperature of from about 40° to 90° C. to mechanical shear sufficient to transform the latex into a paste-like mass, admixing the paste-like mass with steam under a pressure of from about 25 to 400 pounds per square inch with mechanical shear provided by the admixture of steam with said mass to thereby heat the paste-like mass above the softening point of the polymer and form a plurality of macro particles of which at least 90 weight percent are retained on an 80 mesh U.S. Sieve size screen and subsequently subjecting said macro particles to mechanical working to expel at least a majority of water associated therewith.
Claim 6
Dependent Claim
153 words
A process for the recovery of synthetic resinous thermoplastic latex solids from a latex, the steps of the method comprising providing a latex of a synthetic resinous thermoplastic polymer, the latex containing from about 10 to about 50 weight percent solids, subjecting the latex at a temperature of from about 40° to 90° C. to mechanical shear sufficient to transform the latex into a paste-like mass, admixing the paste-like mass with steam under a pressure of from about 25 to 400 pounds per square inch with mechanical shear provided by the admixture of steam with said mass to thereby heat the paste-like mass above the softening point of the polymer and form a plurality of macro particles of which at least 90 weight percent are retained on an 80 mesh U.S. Sieve size screen and subsequently subjecting said macro particles to mechanical working to expel at least a majority of water associated therewith.
Claim 7
Dependent Claim
15 words
The method of claim 4 wherein the latex has polymerized therein styrene, acrylonitrile and rubber.
Claim 8
Dependent Claim
23 words
The method of claim 4 wherein the plurality of macro particles are passed through a fluid operated pinch valve prior to mechanical working.
Claim 9
Dependent Claim
188 words
A process for the recovery of synthetic resinous thermoplastic latex solids from a latex which is a result of the polymerization of styrene and acrylonitrile in the presence of rubber, the steps of the method comprising providing a latex containing from about 10 to about 50 weight percent solids, subjecting the latex to mechanical shear at a temperature of from about 40° to 90° C., the mechanical shear being provided by a butter churn, the mechanical shear being sufficient to transform the latex into a paste-like mass, admixing the paste-like mass with steam under a pressure of from about 25 to 400 pounds per square inch with additional mechanical shear provided by the admixture of steam with said mass to thereby heat the paste-like mass above the softening point of the styrene acrylonitrile rubber polymer and form a plurality of macro particles of which at least 90 weight percent are retained on an 80 mesh U.S. Sieve size screen, passing the macro particles through a fluid operated pinch valve and subsequently subjecting said macro particles to mechanical working to expel at least a majority of water associated therewith.
Claim 10
Dependent Claim
188 words
A process for the recovery of synthetic resinous thermoplastic latex solids from a latex which is a result of the polymerization of styrene and acrylonitrile in the presence of rubber, the steps of the method comprising providing a latex containing from about 10 to about 50 weight percent solids, subjecting the latex to mechanical shear at a temperature of from about 40° to 90° C., the mechanical shear being provided by a butter churn, the mechanical shear being sufficient to transform the latex into a paste-like mass, admixing the paste-like mass with steam under a pressure of from about 25 to 400 pounds per square inch with additional mechanical shear provided by the admixture of steam with said mass to thereby heat the paste-like mass above the softening point of the styrene acrylonitrile rubber polymer and form a plurality of macro particles of which at least 90 weight percent are retained on an 80 mesh U.S. Sieve size screen, passing the macro particles through a fluid operated pinch valve and subsequently subjecting said macro particles to mechanical working to expel at least a majority of water associated therewith.
Claim 11
Dependent Claim
158 words
A process for the recovery of synthetic resinous thermoplastic latex solids from a latex, the steps of the method comprising providing a latex of a synthetic resinous thermoplastic polymer, the latex containing from about 10 to about 50 weight percent solids, subjecting the latex at a temperature of from about 40° to 90° C. to mechanical shear in a butter churn sufficient to transform the latex into a paste-like mass, admixing the paste-like mass with a steam under a pressure of from about 25 to 400 pounds per square inch with mechanical shear provided by the admixture of steam with said mass to thereby heat the paste-like mass above the softening point of the polymer and form a plurality of macro particles of which at least 90 weight percent are retained on an 80 mesh U.S. Sieve size screen and subsequently subjecting said macro particles to mechanical working to expel at least a majority of water associated therewith.
Claim 12
Dependent Claim
158 words
A process for the recovery of synthetic resinous thermoplastic latex solids from a latex, the steps of the method comprising providing a latex of a synthetic resinous thermoplastic polymer, the latex containing from about 10 to about 50 weight percent solids, subjecting the latex at a temperature of from about 40° to 90° C. to mechanical shear in a butter churn sufficient to transform the latex into a paste-like mass, admixing the paste-like mass with a steam under a pressure of from about 25 to 400 pounds per square inch with mechanical shear provided by the admixture of steam with said mass to thereby heat the paste-like mass above the softening point of the polymer and form a plurality of macro particles of which at least 90 weight percent are retained on an 80 mesh U.S. Sieve size screen and subsequently subjecting said macro particles to mechanical working to expel at least a majority of water associated therewith.
Claim 13
Dependent Claim
15 words
The method of claim 8 wherein the latex has polymerized therein styrene, acrylonitrile and rubber.
Claim 14
Dependent Claim
23 words
The method of claim 8 wherein the plurality of macro particles are passed through a fluid operated pinch valve prior to mechanical working.
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) | 1984-11-09 | 1985-05-11 | 1985-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-09 | 1989-05-11 | 1989-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-09 | 1993-05-11 | 1993-11-10 | $7700.00 | Window Closed / Lapsed |