EP0032041A2
Expired / Lapsed
EP
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Use of fumaric acid polymers as antiscalants, and processes for their preparation; polymeric intermediates of mono or dialkyl fumarate, and processes for their production
Assignee: Pfizer Inc
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Filing: 1980-12-22
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Granted: —
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Expires: 2000-12-22
Abstract
Abstract A method for controlling scale deposition from water containing scale forming impurities, which comprises: treating the water with at least about 0.5 part per million of a polymer of fumaric acid with from 0 to about 50 mole percent of at least one hydrophilic monomer selected from acrylamide, methacrylamide, acrylic acid, methacrylic acid or maleic anhydride and from 0 to about 15 mole percent of at least one ethylenically unsaturated, hydrophobic monomer, the average molecular weight of the polymer being from about 300 to about 10,000; processes for the production of said polymers; polymeric intermediates of mono or dialkyl fumarate, and processes for their production.
Inventors
- 👤 Stanley Walter Walinsky
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 12:41
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
86 words
A method for controlling scale deposition from water containing scale forming impurities, which comprises: treating the water with at least about 0.5 part per million of a polymer of fumaric acid with from 0 to about 50 mole percent of at least one hydrophilic monomer selected from acrylamide, methacrylamide, acrylic acid, methacrylic acid or maleic anhydride and from 0 to about 15 mole percent of at least one ethylenically unsaturated, hydrophobic monomer, the average molecular weight of the polymer being from about 300 to about 10,000.
Claim 2
Independent Claim
86 words
A method for controlling scale deposition from water containing scale forming impurities, which comprises: treating the water with at least about 0.5 part per million of a polymer of fumaric acid with from 0 to about 50 mole percent of at least one hydrophilic monomer selected from acrylamide, methacrylamide, acrylic acid, methacrylic acid or maleic anhydride and from 0 to about 15 mole percent of at least one ethylenically unsaturated, hydrophobic monomer, the average molecular weight of the polymer being from about 300 to about 10,000.
Claim 3
Dependent Claim
52 words
A method of claim 1 wherein the hydrophobic monomer of the polymer is styrene, alpha methyl styrene, monoalkyl fumarate having from 1 to 8 carbons in the alkyl group, dialkyl fumarate having 1 to 4 carbons in each of the alkyl groups, or 1-alkene of from 4 to 10 carbons in length.
Claim 4
Dependent Claim
76 words
An intermediate polymer of monoalkyl fumarate with from 0 to about 50 mole percent of at least one hydrophilic monomer selected from acrylamide, methacrylamide, acrylic acid, methacrylic acid or maleic anhydride and from 0 to about 15 mole percent of at least one ethylenically unsaturated, hydrophobic monomer; the average molecular weight of the polymer being from about 500 to about 15,000 and the alkyl group of the monoalkyl fumarate being 1 to 8 carbons in length.
Claim 5
Dependent Claim
76 words
An intermediate polymer of monoalkyl fumarate with from 0 to about 50 mole percent of at least one hydrophilic monomer selected from acrylamide, methacrylamide, acrylic acid, methacrylic acid or maleic anhydride and from 0 to about 15 mole percent of at least one ethylenically unsaturated, hydrophobic monomer; the average molecular weight of the polymer being from about 500 to about 15,000 and the alkyl group of the monoalkyl fumarate being 1 to 8 carbons in length.
Claim 6
Dependent Claim
84 words
An intermediate polymer of from 50 to about 85 mole percent dialkyl fumarate with from 15 to about 50 mole percent of at least one hydrophilic monomer selected from acrylamide, methacrylamide, acrylic acid, methacrylic acid or maleic anhydride and from 0 to about 15 mole percent of at least one ethylenically unsaturated, hydrophobic monomer; the average molecular weight of the polymer being from about 500 to about 15,000 and the alkyl groups of the dialkyl fumarate each being 1 to 4 carbons in length.
Claim 7
Dependent Claim
84 words
An intermediate polymer of from 50 to about 85 mole percent dialkyl fumarate with from 15 to about 50 mole percent of at least one hydrophilic monomer selected from acrylamide, methacrylamide, acrylic acid, methacrylic acid or maleic anhydride and from 0 to about 15 mole percent of at least one ethylenically unsaturated, hydrophobic monomer; the average molecular weight of the polymer being from about 500 to about 15,000 and the alkyl groups of the dialkyl fumarate each being 1 to 4 carbons in length.
Claim 8
Dependent Claim
27 words
An intermediate polymer of claim 3 or 4 wherein the hydrophobic monomer is styrene, alpha methyl styrene, or 1-alkene of from 4 to 10 carbons in length.
Claim 9
Dependent Claim
7 words
Poly (monoalkyl fumarate) according to claim 3.
Claim 10
Dependent Claim
15 words
An intermediate polymer of claim,3 containing about 50 to about 98 mole percent monoalkyl fumarate.
Claim 11
Dependent Claim
19 words
An intermediate polymer of claim 3 or 4 wherein the hydrophilic monomer is maleic anhydride, acrylamide or methacrylic acid.
Claim 12
Dependent Claim
43 words
An intermediate polymer of monoalkyl and dialkyl fumarate having an average molecular weight of from 500 to about 15,000, the monoalkyl group being 1 to 8 carbons in length and each alkyl of the dialkyl group being 1 to 4 carbons in length.
Claim 13
Dependent Claim
43 words
An intermediate polymer of monoalkyl and dialkyl fumarate having an average molecular weight of from 500 to about 15,000, the monoalkyl group being 1 to 8 carbons in length and each alkyl of the dialkyl group being 1 to 4 carbons in length.
Claim 14
Dependent Claim
78 words
A process for preparing poly (monoalkyl fumarate) of claim 3 or poly (monoalkyl and dialkyl fumarate) of claim 9, which comprises: heating at a temperature of about 80° to about 130 0 for about 2 to about 10 hours, a mixture of monoalkyl fumarate and about 5 to about 15 mole percent of a free radical initiator or a mixture of monoalkyl fumarate, dialkyl fumarate and about 5 to about 15 mole percent of a free radical initiator.
Claim 15
Dependent Claim
43 words
A process for preparing polyfumaric acid, which comprises: hydrolyzing the poly (monoalkyl fumarate) or poly (monoalkyl and dialkyl fumarate) of claim 10 with strong, aqueous mineral acid or base at a temperature of at least 60° for at least 8 to 16 hours.
Claim 16
Dependent Claim
12 words
A process of claim 11 wherein aqueous alkali metal hydroxide is used.
Claim 17
Dependent Claim
130 words
A process for preparing an intermediate polymer of claim 3, 4 or 9 which comprises: refluxing for about 2 to about 18 hours, a solution of from about 50 to 100 mole percent monoalkyl fumarate or about 50 to 85 mole percent dialkyl fumarate, 0 to about 50 mole percent of at least one hydrophilic monomer selected from maleic anhydride, acrylic acid, methacrylic acid, methacrylamide or acrylamide, 0 to about 15 mole percent of at least one ethylenically unsaturated, hydrophobic monomer, a poor radical chain transfer solvent and about 5 to about 15 mole percent of a free radical initiator or a solution of a mixture of monoalkyl and dialkyl fumarate, a poor radical chain transfer solvent and about 5 to about 15 mole percent of a free radical initiator.
Claim 18
Dependent Claim
94 words
A process for preparing a polymer of fumaric acid with from 0 to about 50 mole percent of at least one hydrophilic monomer selected from acrylamide, methacrylamide, acrylic acid, methacrylic acid or maleic anhydride and from 0 to about 15 mole percent of at least one ethylenically unsaturated, hydrophobic monomer, the average molecular weight of the polymer being from about 300 to about 10,000, which comprises: hydrolyzing the intermediate polymer of claim 13 with strong, aqueous mineral acid or base at a temperature of at least 60° for at least 8 to 16 hours.
Claim 19
Dependent Claim
11 words
A process of claim 14 wherein alkali metal hydroxide is used.
Claim 20
Dependent Claim
67 words
A copolymer of about 50 to about 85 mole percent fumaric acid with from 15 to about 50 mole percent of at least one hydrophilic monomer selected from acrylamide, methacrylamide, acrylic acid, methacrylic acid or maleic anhydride and from 0 to about 15 mole percent of at least one ethylenically unsaturated, hydrophobic monomer, the average molecular weight of the copolymer being from about 300 to about 10,000.
Claim 21
Dependent Claim
67 words
A copolymer of about 50 to about 85 mole percent fumaric acid with from 15 to about 50 mole percent of at least one hydrophilic monomer selected from acrylamide, methacrylamide, acrylic acid, methacrylic acid or maleic anhydride and from 0 to about 15 mole percent of at least one ethylenically unsaturated, hydrophobic monomer, the average molecular weight of the copolymer being from about 300 to about 10,000.
Claim 22
Dependent Claim
49 words
A copolymer of claim 16 wherein the hydrophobic monomer is styrene, alpha methyl styrene, monoalkyl fumarate having from 1 to 8 carbons in the alkyl group, dialkyl fumarate having 1 to 4 carbons in each of the alkyl groups or 1-alkene of from 4 to 10 carbons in length.
Claim 23
Dependent Claim
16 words
The alkali metal, organic amine or ammonium salt of a copolymer of claim 16 or 17.
References Cited (Backward Citations)
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