US4575454A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal ion control agents based on dicyclopentadiene derivatives
Assignee: Dow Chemical Co
•
Filing: 1984-05-21
•
Granted: 1986-03-11
•
Expires: 2004-05-21
Abstract
Abstract New compounds have been prepared from dicyclopentadiene bis(methylamine) which have the following formula ##STR1## wherein substituents A, B, X and Y each are independently selected from radicals including hydrogen, hydroxyalkyl (wherein the alkyl group contains 2-6 carbon atoms) phosphonic, sulfonic, hydroxyethyl- and hydroxypropylsulfonic, methylenephosphonic methylene-, ethylene- and propylenesulfonic, alkylcarboxylic acid radicals (having 2-4 carbon atoms) and the alkali or alkaline earth metal, ammonia and amine salts of any of the phosphonic, sulfonic or carboxylic acid derivatives. At least one of the substituents must be other than a hydrogen. These compounds are useful chelating agents and those containing the methylenephosphonic substituents are good threshold agents.
Inventors
- 👤 David A. Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:32
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/3804; C07F9/3808; C07F9/3817; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/12; C02F5/14; Y; Y10; Y10S; Y10S423/00; Y10S423/09; Y10S423/14
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
108 words
A process for inhibiting the precipitation of alkaline earth metal ions from their aqueous solutions which comprises adding to said solutions in less than stoichiometric amounts, based on the metal ions present, a compound of the formula ##STR10## wherein substituents A, B, X and Y are each independently selected from radicals including hydrogen, hydroxyalkyl (wherein the alkyl group contains 2-6 carbon atoms) phosphonic, sulfonic, hydroxyethyl- and hydroxypropylsulfonic methylenephosphonic, methylene-, ethylene- and propylenesulfonic, alkylcarboxylic acid radicals (having 2-4 carbon atoms) and the alkali or alkaline earth metal, ammonia and amine salts thereof and wherein at least one of said substituents is a methylenephosphonic acid radical or a salt thereof.
Claim 2
Dependent Claim
108 words
A process for inhibiting the precipitation of alkaline earth metal ions from their aqueous solutions which comprises adding to said solutions in less than stoichiometric amounts, based on the metal ions present, a compound of the formula ##STR10## wherein substituents A, B, X and Y are each independently selected from radicals including hydrogen, hydroxyalkyl (wherein the alkyl group contains 2-6 carbon atoms) phosphonic, sulfonic, hydroxyethyl- and hydroxypropylsulfonic methylenephosphonic, methylene-, ethylene- and propylenesulfonic, alkylcarboxylic acid radicals (having 2-4 carbon atoms) and the alkali or alkaline earth metal, ammonia and amine salts thereof and wherein at least one of said substituents is a methylenephosphonic acid radical or a salt thereof.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein the substituent salt of the methylenephosphonic acid radical is an alkali metal salt.
Claim 4
Dependent Claim
17 words
The process of claim 1 wherein the substituent salt of the methylenephosphonic acid is an amine salt.
Claim 5
Dependent Claim
19 words
The process of claim 1 wherein the substituent salt of the methylenephosphonic acid is an alkaline earth metal salt.
Claim 6
Dependent Claim
15 words
The process of claim 4 wherein the alkaline earth metal is magnesium, calcium or barium.
Claim 7
Dependent Claim
17 words
The process of claim 1 wherein the substituent salt of the methylenephosphonic acid is an ammonium salt.
Claim 8
Dependent Claim
101 words
A process for chelating metal ions in an aqueous solution thereof which comprises adding thereto at least a stoichiometric amount based on the metal ions present, of a compound, having the following formula ##STR11## wherein substituents A, B, X and Y each are independently selected from radicals including hydrogen, hydroxyalkyl (wherein the alkyl group contains 2-6 carbon atoms) phosphonic, sulfonic, hydroxyethyl- and hydroxypropylsulfonic, methylenephosphonic, methylene-, ethylene- and propylenesulfonic, alkylcarboxylic acid radicals (having 2-4 carbon atoms) and the alkali or alkaline earth metal, ammonia and amine salts thereof and wherein at least one A, B, X and Y is other than hydrogen.
Claim 9
Dependent Claim
101 words
A process for chelating metal ions in an aqueous solution thereof which comprises adding thereto at least a stoichiometric amount based on the metal ions present, of a compound, having the following formula ##STR11## wherein substituents A, B, X and Y each are independently selected from radicals including hydrogen, hydroxyalkyl (wherein the alkyl group contains 2-6 carbon atoms) phosphonic, sulfonic, hydroxyethyl- and hydroxypropylsulfonic, methylenephosphonic, methylene-, ethylene- and propylenesulfonic, alkylcarboxylic acid radicals (having 2-4 carbon atoms) and the alkali or alkaline earth metal, ammonia and amine salts thereof and wherein at least one A, B, X and Y is other than hydrogen.
Claim 10
Dependent Claim
16 words
The process of claim 7 wherein A, B, X and Y are each methylenephosphonic acid radicals.
Claim 11
Dependent Claim
14 words
The process of claim 8 wherein the acid radicals are in a salt form.
References Cited (Backward Citations)
US2609390A
Cited
US2599807A
Cited
US3288846A
Cited
US3336721A
Cited
US3331773A
Cited
US3434969A
Cited
US3674804A
Cited
US3720498A
Cited
US3859211A
Cited
US3954761A
Cited
US4051110A
Cited
US3743603A
Cited
US4307038A
Cited
US4323461A
Cited
US4229294A
Cited
US4330487A
Cited
US4416785A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-10 | 1989-09-09 | 1990-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-10 | 1993-09-09 | 1994-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-10 | 1997-09-09 | 1998-03-11 | $7700.00 | Window Closed / Lapsed |