US4446309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for continuously coagulating a rubbery polymer latex
Assignee: JSR Corp
•
Filing: 1982-02-23
•
Granted: 1984-05-01
•
Expires: 2002-02-23
Abstract
Abstract A method for continuously coagulating a rubbery polymer latex to obtain a polymer solid, characterized in that into a coagulator composed of (a) a cylindrical body having at one end a nozzle for feeding rubbery polymer latex and a nozzle for feeding coagulant solution, and having at the other end a discharging nozzle, (b) a stirrer mounted rotatably along the central axis of the cylindrical body, said stirrer having several stages of agitating blades, and (c) stationary blades fixed to the wall of the cylindrical body at the spaces between the stages of agitating blades, are continuously fed the rubbery polymer latex and a coagulant solution through the above-mentioned respective nozzles so as to collide against each other, and stirred during their movement from the one end of the coagulator to the other end to coagulate the latex. By this method, there can be obtained molded porous polymer crumbs having an intended size.
Inventors
- 👤 Takashi Jiroumaru
- 👤 Mamoru Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:02
CPC Classifications
C; C08; C08C; C08C1/00; C08C1/14; B; B01; B01F; B01F27/00; B01F27/60; B01F27/70; B01F27/707; B29; B29B; B29B7/00; B29B7/30; B29B7/34; B29B7/38; B29B7/40; B29B7/402; B29B7/74; B29B7/7476; B29B7/7495
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
179 words
A method for continuously coagulating a rubbery polymer latex to obtain a polymer solid, characterized in that into a coagulator consisting essentially of (a) a cylindrical body having at one end a nozzle for feeding rubbery polymer latex and a nozzle for feeding coagulant solution and having at the other end a discharging nozzle, (b) a stirrer mounted rotatably along the central axis of the cylindrical body, said stirrer having several stages of agitating blades, and (c) stationary blades fixed to the wall of the cylindrical body at the spaces between the stages of the agitating blades, are continuously fed the rubbery polymer latex and a coagulant solution through the above-mentioned respective nozzles in such proportions that the polymer solids content in the coagulator becomes 5-50% by weight based on the total weight of the latex and the coagulant solution so as to collide against each other, and subjected during their movement from the one end of the coagulator to the other end to highly fluidized state caused by a stirring power of at least 20 KW/m 3 .
Claim 2
Independent Claim
179 words
A method for continuously coagulating a rubbery polymer latex to obtain a polymer solid, characterized in that into a coagulator consisting essentially of (a) a cylindrical body having at one end a nozzle for feeding rubbery polymer latex and a nozzle for feeding coagulant solution and having at the other end a discharging nozzle, (b) a stirrer mounted rotatably along the central axis of the cylindrical body, said stirrer having several stages of agitating blades, and (c) stationary blades fixed to the wall of the cylindrical body at the spaces between the stages of the agitating blades, are continuously fed the rubbery polymer latex and a coagulant solution through the above-mentioned respective nozzles in such proportions that the polymer solids content in the coagulator becomes 5-50% by weight based on the total weight of the latex and the coagulant solution so as to collide against each other, and subjected during their movement from the one end of the coagulator to the other end to highly fluidized state caused by a stirring power of at least 20 KW/m 3 .
Claim 3
Dependent Claim
38 words
A method according to claim 1, wherein the rubbery polymer latex is a latex of styrene-butadiene rubber, acrylonitrile-butadiene rubber, polybutadiene rubber, acrylic rubber, vinyl acetate copolymer rubber, chloroprene rubber or a mixture of two or more of them.
Claim 4
Dependent Claim
17 words
A method according to claim 1, wherein the rubbery polymer latex is a latex of styrene-butadiene rubber.
Claim 5
Dependent Claim
51 words
A method according to claim 3, wherein the latex of styrene-butadiene rubber is a creamy latex formed by adding an aqueous sodium chloride solution to the latex so that the sodium chloride solid content in the solution becomes 5 to 60% by weight based on the weight of the polymer solid.
Claim 6
Dependent Claim
20 words
A method according to claim 1, wherein the coagulant solution is an aqueous solution of an acid or a salt.
Claim 7
Dependent Claim
25 words
A method according to claim 5, wherein the aqueous acid solution is an aqueous solution of sulfuric acid, hydrochloric acid, phosphoric acid or acetic acid.
Claim 8
Dependent Claim
29 words
A method according to claim 5, wherein the aqueous salt solution is an aqueous solution of Ca(NO 3 ) 2 , Al 2 (SO 4 ) 3 or NaCl.
Claim 9
Dependent Claim
14 words
A method according to claim 1, wherein the coagulant solution is an organic solvent.
Claim 10
Dependent Claim
20 words
A method according to claim 8, wherein the organic solvent is a ketone or an alcohol or a mixture thereof.
Claim 11
Dependent Claim
20 words
A method according to claim 9, wherein the ketone is acetone, and the alcohol is methyl alcohol or ethyl alcohol.
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) | 1987-05-01 | 1987-10-31 | 1988-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-01 | 1991-10-31 | 1992-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-01 | 1995-10-31 | 1996-05-01 | $7700.00 | Window Closed / Lapsed |