US4623678A
Expired / Lapsed
US
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Method for shear coagulation of latex resins
Assignee: Dow Chemical Co
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Filing: 1985-04-26
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Granted: 1986-11-18
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Expires: 2005-04-26
Abstract
Abstract In accordance with the present invention, solids are recovered from a latex stabilized with a pH sensitive emulsifier by passing carbon dioxide through the latex to lower the pH and thereby destabilize the latex and then subjecting the latex to high shear.
Inventors
- 👤 Eugene R. Moore
- 👤 Norman A. Lefevre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 22:50
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/14; C08F6/22; C08C; C08C1/00; C08C1/14; C08C1/16; Y; Y10; Y10S; Y10S260/00; Y10S260/22; Y10S528/00; Y10S528/931; Y10S528/934; Y10S528/936
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
62 words
A process for shear coagulating a latex resin to form a paste-like product, comprising the steps of: (A) providing a latex stabilized with a pH sensitive emulsifier mixture and having a pH above 7.5; (B) destabilizing said latex by contacting said latex with gaseous carbon dioxide; and (C) subjecting said latex to high shear in an amount sufficient to coagulate said latex.
Claim 2
Dependent Claim
62 words
A process for shear coagulating a latex resin to form a paste-like product, comprising the steps of: (A) providing a latex stabilized with a pH sensitive emulsifier mixture and having a pH above 7.5; (B) destabilizing said latex by contacting said latex with gaseous carbon dioxide; and (C) subjecting said latex to high shear in an amount sufficient to coagulate said latex.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein step (C) is performed sequentially after step (B).
Claim 4
Dependent Claim
14 words
The process of claim 1 wherein step (C) is performed simultaneously with step (B).
Claim 5
Dependent Claim
52 words
The process of claim 1 wherein the pH sensitive emulsifier is selected from the group consisting of alkali metal salts of saturated and unsaturated fatty acids having from about 8 to about 18 carbon atoms, and mixtures thereof; and such pH sensitive emulsifiers are at least 25% of the total emulsifier package.
Claim 6
Dependent Claim
33 words
The process of claim 1 wherein said emulsifier is selected from the group consisting of the sodium and potassium salts of oleic, palmitic, stearic, myristic, linoleic, linolinic, and lauric acids, and mixtures thereof.
Claim 7
Dependent Claim
12 words
The process of claim 1 wherein said emulsifier is a rosin soap.
Claim 8
Dependent Claim
19 words
The process of claim 1 wherein the latex comprises the polymerized reaction product of styrene, acrylonitrile, and a butadiene.
Claim 9
Dependent Claim
25 words
The process of claim 1 wherein 90%, by weight, of the resin particles are in the range of about 800 Å to about 20,000 Å.
Claim 10
Dependent Claim
16 words
The process of claim 1 wherein the latex is saturated with carbon dioxide in step (B).
Claim 11
Dependent Claim
19 words
The process of claim 1 where any carbon dioxide remaining after step (C) is removed from said coagulated latex.
Claim 12
Dependent Claim
17 words
The process of claim 1 wherein said stabilized latex comprises from about 25% to about 60% solids.
Claim 13
Dependent Claim
35 words
The process of claim 1 wherein said resin is a grafted emulsion polymerization product of acrylonitrile, butadiene and styrene and said latex is stabilized by an emulsifier comprising an alkali metal salt of oleic acid.
Claim 14
Dependent Claim
17 words
The process of claim 12 wherein said latex has a pH of about 7.0 after step (B).
Claim 15
Dependent Claim
89 words
A process for coagulating a stabilized aqueous latex resin emulsion stabilized by an effective amount of a pH sensitive emulsifier and having a pH of from at least 7.5 to about 12.0 comprising the steps of: (A) contacting said emulsion with gaseous carbon dioxide in an amount effective to lower the pH of said emulsion to a pH of from about 6.0 up to 7.5 at which said pH sensitive emulsifier is not effective to stabilize said emulsion; and (B) shear coagulating said latex to form a paste-like product.
Claim 16
Dependent Claim
89 words
A process for coagulating a stabilized aqueous latex resin emulsion stabilized by an effective amount of a pH sensitive emulsifier and having a pH of from at least 7.5 to about 12.0 comprising the steps of: (A) contacting said emulsion with gaseous carbon dioxide in an amount effective to lower the pH of said emulsion to a pH of from about 6.0 up to 7.5 at which said pH sensitive emulsifier is not effective to stabilize said emulsion; and (B) shear coagulating said latex to form a paste-like product.
Claim 17
Dependent Claim
44 words
The process of claim 14 wherein said stabilized emulsion has a pH of from about 9.0 to about 11.0 and said stabilized emulsion is contacted with gaseous carbon dioxide effective to lower the pH of said emulsion to from about 6.8 to about 7.2.
Claim 18
Dependent Claim
14 words
The process of claim 15 wherein step (B) is performed sequentially after step (A).
Claim 19
Dependent Claim
14 words
The process of claim 15 wherein step (B) is performed simultaneously with step (A).
Claim 20
Dependent Claim
19 words
The process of claim 15 wherein said emulsion comprises the polymerized reaction product of styrene, acrylonitrile and a butadiene.
Claim 21
Dependent Claim
33 words
The process of claim 15 wherein said emulsifier is selected from the group consisting of the sodium and potassium salts of oleic, palmitic, stearic, myristic, linoleic, linolinic, and lauric acids and mixtures thereof.
Claim 22
Dependent Claim
12 words
The process of claim 15 wherein said emulsifier is a rosin soap.
Claim 23
Dependent Claim
13 words
A latex resin product coagulated in accordance with the process of claim 1.
Claim 24
Dependent Claim
13 words
A latex resin product coagulated in accordance with the process of claim 15.
Claim 25
Dependent Claim
13 words
A latex resin product coagulated in accordance with the process of claim 19.
Claim 26
Dependent Claim
13 words
A latex resin product coagulated in accordance with the process of claim 20.
References Cited (Backward Citations)
US1989241A
Cited
US2467054A
Cited
US2576318A
Cited
US2786879A
Cited
US2984631A
Cited
US2993020A
Cited
US3032524A
Cited
US3245970A
Cited
US3459693A
Cited
US3663462A
Cited
US4287312A
Cited
US4302377A
Cited
US4299952A
Cited
US4419496A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-11-17 | 1990-05-19 | 1990-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-17 | 1994-05-19 | 1994-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-17 | 1998-05-19 | 1998-11-18 | $7700.00 | Window Closed / Lapsed |