US4026932A
Expired / Lapsed
US
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Method for converting alkenoic acid copolymer latexes into water solutions
Assignee: Dow Chemical Co
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Filing: 1975-12-11
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Granted: 1977-05-31
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Expires: 1995-12-11
Abstract
Abstract A method for the preparation of aqueous solutions of anionic polyelectrolytes by combining a stream of a high solid content alkenoic acid-alkyl acrylate latex with a stream of aqueous alkali metal hydroxide, mixing the combined streams under low shear conditions and heating the mixture to produce a polyelectrolyte solution.
Inventors
- 👤 James Richard Gross
- 👤 James Larry Potter
- 👤 Frederick Bernhard Kassell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:22
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/03; C08F; C08F8/00; C08F8/44; C08J2333/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
147 words
A method for converting an alkyl acrylate-alkenoic acid copolymer latex into a water soluble solution of the alkali metal salts of said copolymer which comprises the steps of A. combining a stream of said latex containing 10 to 55% by weight of said copolymer with an aqueous stream containing an alkali metal hydroxide in an amount in molar excess of that required for neutralization of the alkenoic acid functionality; B. mixing said combined streams under low shear conditions and a temperature range from 40°-90° C to achieve a substantially homogeneous mixture wherein the shearing of the copolymer and the viscosity of the mixture are minimized; and heating said mixture to a temperature range from about 40° to about 90° C for a time sufficient to allow the excess alkali metal hydroxide to saponify the alkyl acrylate moieties in the copolymer equivalent to said excess alkali metal hydroxide.
Claim 2
Independent Claim
147 words
A method for converting an alkyl acrylate-alkenoic acid copolymer latex into a water soluble solution of the alkali metal salts of said copolymer which comprises the steps of A. combining a stream of said latex containing 10 to 55% by weight of said copolymer with an aqueous stream containing an alkali metal hydroxide in an amount in molar excess of that required for neutralization of the alkenoic acid functionality; B. mixing said combined streams under low shear conditions and a temperature range from 40°-90° C to achieve a substantially homogeneous mixture wherein the shearing of the copolymer and the viscosity of the mixture are minimized; and heating said mixture to a temperature range from about 40° to about 90° C for a time sufficient to allow the excess alkali metal hydroxide to saponify the alkyl acrylate moieties in the copolymer equivalent to said excess alkali metal hydroxide.
Claim 3
Dependent Claim
20 words
The process as set forth in claim 1 wherein the alkyl acrylate-alkenoic acid copolymer is an alkyl acrylate-methacrylic acid copolymer.
Claim 4
Dependent Claim
25 words
The process as set forth in claim 2 wherein the alkyl acrylate-methacrylic acid copolymer contains about 8 to about 50% by weight of methacrylic acid.
Claim 5
Independent Claim
156 words
A method for converting an alkyl acrylate-alkenoic acid copolymer latex into a water soluble solution of the alkali metal salts of said copolymer which comprises the steps of A. combining a stream of said latex containing 10 to 55% by weight of said copolymer with an aqueous stream containing an alkali metal hydroxide in an amount in molar excess of that required for neutralization of the alkenoic acid functionality in a low shear positive displacement pump zone; B. mixing said combined streams under low shear conditions and a temperature range from 40°-90° C to achieve a substantially homogeneous mixture wherein the shearing of the copolymer and the viscosity of the mixture are minimized; and C. heating said mixture to a temperature range from about 40° to about 90° C for a time sufficient to allow the excess alkali metal hydroxide to saponify the alkyl acrylate moieties in the copolymer equivalent to said excess alkali metal hydroxide.
Claim 6
Independent Claim
156 words
A method for converting an alkyl acrylate-alkenoic acid copolymer latex into a water soluble solution of the alkali metal salts of said copolymer which comprises the steps of A. combining a stream of said latex containing 10 to 55% by weight of said copolymer with an aqueous stream containing an alkali metal hydroxide in an amount in molar excess of that required for neutralization of the alkenoic acid functionality in a low shear positive displacement pump zone; B. mixing said combined streams under low shear conditions and a temperature range from 40°-90° C to achieve a substantially homogeneous mixture wherein the shearing of the copolymer and the viscosity of the mixture are minimized; and C. heating said mixture to a temperature range from about 40° to about 90° C for a time sufficient to allow the excess alkali metal hydroxide to saponify the alkyl acrylate moieties in the copolymer equivalent to said excess alkali metal hydroxide.
Claim 7
Independent Claim
153 words
A method for converting an alkyl acrylate-alkenoic acid copolymer latex into a water soluble solution of the alkali metal salts of said copolymer which comprises the steps of A. combining a stream of said latex containing 10 to 55% by weight of said copolymer with an aqueous stream containing an alkali metal hydroxide in an amount in molar excess of that required for neutralization of the alkenoic acid functionality; B. mixing said combined streams in a static mixer zone under low shear conditions and a temperature range from 40°-90° C to achieve a substantially homogeneous mixture wherein the shearing of the copolymer and the viscosity of the mixture are minimized; and C. heating said mixture to a temperature range from about 40° to about 90° C for a time sufficient to allow the excess alkali metal hydroxide to saponify the alkyl acrylate moieties in the copolymer equivalent to said excess alkali metal hydroxide.
Claim 8
Independent Claim
153 words
A method for converting an alkyl acrylate-alkenoic acid copolymer latex into a water soluble solution of the alkali metal salts of said copolymer which comprises the steps of A. combining a stream of said latex containing 10 to 55% by weight of said copolymer with an aqueous stream containing an alkali metal hydroxide in an amount in molar excess of that required for neutralization of the alkenoic acid functionality; B. mixing said combined streams in a static mixer zone under low shear conditions and a temperature range from 40°-90° C to achieve a substantially homogeneous mixture wherein the shearing of the copolymer and the viscosity of the mixture are minimized; and C. heating said mixture to a temperature range from about 40° to about 90° C for a time sufficient to allow the excess alkali metal hydroxide to saponify the alkyl acrylate moieties in the copolymer equivalent to said excess alkali metal hydroxide.
Claim 9
Dependent Claim
20 words
The process as set forth in claim 4 wherein the alkyl acrylate-alkenoic acid copolymer is an alkyl acrylate-methacrylic acid copolymer.
Claim 10
Dependent Claim
25 words
The process as set forth in claim 6 wherein the alkyl acrylate-methacrylic acid copolymer contains about 8 to about 50% by weight of methacrylic acid.
Claim 11
Dependent Claim
20 words
The process as set forth in claim 5 wherein the alkyl acrylate-alkenoic acid copolymer is an alkyl acrylate-methacrylic acid copolymer.
Claim 12
Dependent Claim
25 words
The process as set forth in claim 8 wherein the alkyl acrylate-methacrylic acid copolymer contains about 8 to about 50% by weight of methacrylic acid.
Claim 13
Dependent Claim
176 words
In a method for converting an alkyl acrylate-alkenoic acid copolymer latex into a water soluble solution of the alkali metal salts of said copolymer which comprises the steps of combining said latex containing 10 to 55% by weight of said copolymer with an aqueous solution containing an alkali metal hydroxide in an amount in molar excess of that required for neutralization of the alkenoic acid functionality; mixing said combined streams under low shear conditions and a temperature range from 40°-90° C to achieve a substantially homogeneous mixture wherein the shearing of the copolymer and the viscosity of the mixture are minimized; and heating said mixture to a temperature range from about 40° to about 90° C for a time sufficient to allow the excess alkali metal hydroxide to saponify the alkyl acrylate moieties in the copolymer equivalent to said excess alkali metal hydroxide, the improvement which comprises combining a stream of said latex with a stream of said solution in a low shear positive displacement pump zone and mixing said streams in a static mixer zone.
Claim 14
Dependent Claim
176 words
In a method for converting an alkyl acrylate-alkenoic acid copolymer latex into a water soluble solution of the alkali metal salts of said copolymer which comprises the steps of combining said latex containing 10 to 55% by weight of said copolymer with an aqueous solution containing an alkali metal hydroxide in an amount in molar excess of that required for neutralization of the alkenoic acid functionality; mixing said combined streams under low shear conditions and a temperature range from 40°-90° C to achieve a substantially homogeneous mixture wherein the shearing of the copolymer and the viscosity of the mixture are minimized; and heating said mixture to a temperature range from about 40° to about 90° C for a time sufficient to allow the excess alkali metal hydroxide to saponify the alkyl acrylate moieties in the copolymer equivalent to said excess alkali metal hydroxide, the improvement which comprises combining a stream of said latex with a stream of said solution in a low shear positive displacement pump zone and mixing said streams in a static mixer zone.
References Cited (Backward Citations)
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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) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |