Patent US3665035A successfully refreshed from Google Patents.
US3665035A
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Acrylic composition for water treatment and process for making same
Assignee: Milchem Inc
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Filing: 1969-08-18
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Granted: 1972-05-23
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Expires: 1989-08-18
Abstract
Abstract This invention relates to an acrylic composition; a process for obtaining the acrylic composition; to the use of such composition to remove and/or inhibit scale formation in water treatment apparatuses, oil and gas wells, producing formations, and other scale containing or attracting surfaces. Said novel composition is formed from about 80 to 90 parts by weight acrylic acid, about 7 to 15 parts by weight thioglycolic acid, and about 1.5 to 5 parts by weight ammonium persulfate.
Inventors
- 👤 Herbert L Rice
- 👤 Arthur Cizek
- 👤 Marvin O Thaemar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:59
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C08; C08F; C08F220/00; C08F220/02; C08F220/04; C08F220/06; Y; Y10; Y10S; Y10S507/00; Y10S507/927
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
33 words
The composition of claim 1 in which said reaction is conducted at 24* to 50* C in the presence of a catalytic ion selected from the class consisting of ferric, ferrous, and cupric.
Claim 2
Dependent Claim
26 words
The composition of claim 1 in which said reaction is conducted in a solvent selected from the class consisting of water, dimethyl formamide, and ethylene glycol.
Claim 3
Dependent Claim
11 words
The composition of claim 3 in which said solvent is water.
Claim 4
Dependent Claim
101 words
The composition of claim 3 in which at least 280 parts solvent is used; said acrylic acid, thioglycolic acid, and ammonium persulfate are each divided into substantially equal aliquot portions; the said reaction being conducted by successive incremental additions to the solvent, each such addition consisting of one of said aliquot portions of acrylic acid followed by one of said aliquot portions of thioglycolic acid and finally by one of said aliquot portions of ammonium persulfate; and each said successive incremental additiOn of reactants after the initial addition is made after the reaction has been completed for the preceding incremental addition.
Claim 5
Dependent Claim
73 words
An acrylic composition formed by reacting at a temperature of from about 24* to about 80* C in an aqueous solution (1) acrylic acid of between 5 percent and 30 percent by weight of the total aqueous solution with (2) thioglycolic acid of between 10 percent and 15 percent by weight of the acrylic acid utilized and with (3) ammonium persulfate of between 3 percent and 5 percent of the acrylic acid used.
Claim 6
Dependent Claim
45 words
The composition of claim 6 in which said reaction is conducted at a temperature between 24* C and 50* C and 5 to 30 ppm of a catalytic ion selected from the class consisting of ferric, ferrous, and cupric is added to the aqueous solution.
Claim 7
Dependent Claim
93 words
The composition of claim 6 in which the acrylic acid, thioglycolic acid and ammonium persulfate are divided into substantially equal aliquot portions; the reaction is conducted by successive incremental additions to the aqueous solution, each such successive addition consisting of (a) one of said aliquot portions of acrylic acid followed by (b) one of said aliquot portions of thioglycolic acid and finally by (c) one of said aliquot portions of ammonium persulfate; and each incremental addition after the initial addition is made after the reaction is substantially completed for the preceding incremental addition.
Claim 8
Dependent Claim
20 words
Composition of claim 6 in which 12 percent thioglycolic acid and 4 percent ammonium persulfate react with said acrylic acid.
Claim 9
Dependent Claim
95 words
A composition consisting essentially of the product formed by (1) the reaction at a temperature of from about 24* to about 80* C in an inert solvent of 80 to 90 parts by weight acrylic acid, 7 to 15 parts by weight thioglycolic acid, and 1.5 to 5 parts by weight ammonium persulfate and (2) neutralization of the product obtained in (1) to a pH of about 5 to 8 with an alkaline material selected from the class consisting of (a) sodium, potassium, and ammonium hydroxides, (b) alkyl amines and (c) mono-, di-, and trialkanolamines.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |