US4443358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noncrystallizing aqueous solutions of metal salts of naphthalene sulfonic acid-formaldehyde condensation products
Assignee: Zeneca Inc
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Filing: 1982-11-15
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Granted: 1984-04-17
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Expires: 2002-11-15
Abstract
Abstract Aqueous solutions of naphthalene sulfonic acid/formaldehyde salts of at least two alkali metal ions remain substantially free of precipitate at temperatures of 0°-5° C.
Inventors
- 👤 Robert M. Fry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:30
CPC Classifications
C; C07; C07C; C07C309/00; C04; C04B; C04B24/00; C04B24/16; C04B24/20; C04B24/22; C04B24/226; C09; C09K; C09K23/00; C09K23/12
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
130 words
An aqueous solution of a dispersing composition substantially free of precipitate at temperatures of 0°-5° C. which comprises 30-60% of a mixed salt blend of a high molecular weight condensation product of naphthalene sulfonic acid and formaldehyde having a general formula selected from at least two of the following: M SO.sub.3 --(NAPHTH)--[CH.sub.2 (NAPHTH)--SO.sub.3 M].sub.n --H I X SO.sub.3 --(NAPHTH)--[CH.sub.2 --(NAPHTH)--SO.sub.3 S].sub.n --H II M SO.sub.3 --(NAPHTH)--[CH.sub.2 --(NAPHTH)--SO.sub.3 X].sub.n --H III wherein M and X are different and interchangeably selected from at least two ions selected from the group consisting of Na, Li, K and NH 4 ; (NAPHTH) is a naphthalene radical; and n has a value of 5-20, and a minor amount of sulfate salts of said ions wherein the mol ratio of M/X ranges from 1/3 to 3/1.
Claim 2
Dependent Claim
130 words
An aqueous solution of a dispersing composition substantially free of precipitate at temperatures of 0°-5° C. which comprises 30-60% of a mixed salt blend of a high molecular weight condensation product of naphthalene sulfonic acid and formaldehyde having a general formula selected from at least two of the following: M SO.sub.3 --(NAPHTH)--[CH.sub.2 (NAPHTH)--SO.sub.3 M].sub.n --H I X SO.sub.3 --(NAPHTH)--[CH.sub.2 --(NAPHTH)--SO.sub.3 S].sub.n --H II M SO.sub.3 --(NAPHTH)--[CH.sub.2 --(NAPHTH)--SO.sub.3 X].sub.n --H III wherein M and X are different and interchangeably selected from at least two ions selected from the group consisting of Na, Li, K and NH 4 ; (NAPHTH) is a naphthalene radical; and n has a value of 5-20, and a minor amount of sulfate salts of said ions wherein the mol ratio of M/X ranges from 1/3 to 3/1.
Claim 3
Dependent Claim
59 words
A composition of claim 1 when made by reacting an aqueous solution of naphthalene sulfonic acid/formaldehyde condensation product having the general formula HSO.sub.3 (NAPHTH)--[CH.sub.2 (NAPHTH)SO.sub.3 H].sub.n --H wherein n is 5-20 and (NAPHTH) is a naphthalene radical, containing unreacted sulfuric acid, with at least two hydroxides or carbonates selected from the group consisting of sodium, potassium, lithium and ammonium.
Claim 4
Dependent Claim
14 words
A composition of claim 2 when said hydroxides or carbonates are reacted in sequence.
Claim 5
Dependent Claim
13 words
A composition of claim 2 when said hydroxides or carbonate are reacted simultaneously.
Claim 6
Dependent Claim
126 words
An aqueous solution of a dispersing composition substantially free of precipitate at temperatures of 0°-5° C. which compises 30-60% of a mixed salt blend of a high molecular weight condensation product of naphthalene sulfonic acid and formaldehyde having a general formula selected from at least two of the following: MSO.sub.3 --(NAPHTH)--[CH.sub.2 --(NAPHTH)--SO.sub.3 M].sub.n --H I XSO.sub.3 --(NAPHTH)--[CH.sub.2 --(NAPHTH)--SO.sub.3 X].sub.n --H II MSO.sub.3 --(NAPHTH)--[CH.sub.2 --(NAPHTH)--SO.sub.3 X].sub.n --H III wherein M and X are different and interchangeably selected from at least two ions selected from the group consisting of Na, K and NH 4 ; (NAPHTH) is a naphthalene radical; and n has a value of 5-20, and a minor amount of sulfate salts of said ions wherein the mol ratio of M/X ranges from 1/3 to 3/1.
Claim 7
Dependent Claim
126 words
An aqueous solution of a dispersing composition substantially free of precipitate at temperatures of 0°-5° C. which compises 30-60% of a mixed salt blend of a high molecular weight condensation product of naphthalene sulfonic acid and formaldehyde having a general formula selected from at least two of the following: MSO.sub.3 --(NAPHTH)--[CH.sub.2 --(NAPHTH)--SO.sub.3 M].sub.n --H I XSO.sub.3 --(NAPHTH)--[CH.sub.2 --(NAPHTH)--SO.sub.3 X].sub.n --H II MSO.sub.3 --(NAPHTH)--[CH.sub.2 --(NAPHTH)--SO.sub.3 X].sub.n --H III wherein M and X are different and interchangeably selected from at least two ions selected from the group consisting of Na, K and NH 4 ; (NAPHTH) is a naphthalene radical; and n has a value of 5-20, and a minor amount of sulfate salts of said ions wherein the mol ratio of M/X ranges from 1/3 to 3/1.
Claim 8
Dependent Claim
18 words
A composition of claim 5 wherein M and X are the group consisting of Na+ and K+ ions.
Claim 9
Dependent Claim
33 words
A composition of claim 5 containing 38-42% of said salt blend, wherein M and X are the group consisting of Na and K and said ratio of M to X is about 1/1.
Claim 10
Dependent Claim
19 words
A composition of claim 5 wherein M and X are the group consisting of K and NH 4 ions.
Claim 11
Dependent Claim
19 words
A composition of claim 5 wherein M and X are the group consisting of Na and NH 4 ions.
Claim 12
Dependent Claim
20 words
A composition of claim 5 wherein M and X are the group consisting of Na, K and NH 4 .
Claim 13
Dependent Claim
30 words
A composition of claim 5 when made by blending a composition of general formula (I) with a composition of general formula (II) wherein M is Na and X is K.
Claim 14
Dependent Claim
27 words
A composition of claim 5 when prepared by mixing a composition of claim 10 with a composition of general formula (I) wherein M is NH 4 .
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-04-17 | 1987-10-17 | 1988-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-17 | 1991-10-17 | 1992-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-17 | 1995-10-17 | 1996-04-17 | $7700.00 | Window Closed / Lapsed |