US3870671A
Expired / Lapsed
US
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Method for dispersing
Assignee: Evonik Operations GmbH
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Filing: 1973-04-04
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Granted: 1975-03-11
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Expires: 1993-04-04
Abstract
Abstract A process for dispersing finely divided solids by melamineformaldehyde resins which are modified with sulfite, amidosulfonic or sulfonic acid groups and treated to enhance their dispersion action.
Inventors
- 👤 Alois Aignesberger
- 👤 Ulrich Kriele
- 👤 Horst Michaud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:15
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0071; C09B67/0084; C09B67/0085; C09B67/0086; C09D; C09D17/00; C09D17/004; C09K; C09K23/00; C09K23/017; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/03; Y10S516/05
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
90 words
A METHOD FOR DISPERSING FINELY DIVIDED, WATER-INSOLUBLE SOLIDS, COMPRISING DIALYZING A SULFITE, AMIDOSULFONIC ACID OR SULFONIC ACID MODIFIED MELAMINE-FORMALDEHYDE RESIN, THE SULFITE OR SULFONIC ACID GROUP OF WHICH IS IN THE FORM OF A SODIUM SALT, SAID RESIN BEING OF A MOLECULAR WEIGHT BETWEEN 5,000 AND 50,000, ADMIXING SAID RESIN IN AN AMOUNT FROM 1 TO 10 PERCENT BY WEIGHT WITH SAID FINELY DIVIDED WATER-INSOLUBLE SOLID, IN AN AQUEOUS MEDIUM HAVING A PH RANGE ABOVE 6.5 AND DISPERSING SAID SOLID IN SAID AQUEOUS MEDIUM IN THE PRESENCE OF SAID RESIN.
Claim 2
Independent Claim
90 words
A METHOD FOR DISPERSING FINELY DIVIDED, WATER-INSOLUBLE SOLIDS, COMPRISING DIALYZING A SULFITE, AMIDOSULFONIC ACID OR SULFONIC ACID MODIFIED MELAMINE-FORMALDEHYDE RESIN, THE SULFITE OR SULFONIC ACID GROUP OF WHICH IS IN THE FORM OF A SODIUM SALT, SAID RESIN BEING OF A MOLECULAR WEIGHT BETWEEN 5,000 AND 50,000, ADMIXING SAID RESIN IN AN AMOUNT FROM 1 TO 10 PERCENT BY WEIGHT WITH SAID FINELY DIVIDED WATER-INSOLUBLE SOLID, IN AN AQUEOUS MEDIUM HAVING A PH RANGE ABOVE 6.5 AND DISPERSING SAID SOLID IN SAID AQUEOUS MEDIUM IN THE PRESENCE OF SAID RESIN.
Claim 3
Independent Claim
90 words
A method for dispersing finely divided, water-insoluble solids, comprising dialyzing a sulfite, amidosulfonic acid or sulfonic acid modified melamine-formaldehyde resin, the sulfite or sulfonic acid group of which is in the form of a sodium salt, said resin being of a molecular weight between 5,000 and 50,000, admixing said resin in an amount from 1 to 10 percent by weight with said finely divided water-insoluble solid, in an aqueous medium having a pH range above 6.5 and dispersing said solid in said aqueous medium in the presence of said resin.
Claim 4
Independent Claim
90 words
A method for dispersing finely divided, water-insoluble solids, comprising dialyzing a sulfite, amidosulfonic acid or sulfonic acid modified melamine-formaldehyde resin, the sulfite or sulfonic acid group of which is in the form of a sodium salt, said resin being of a molecular weight between 5,000 and 50,000, admixing said resin in an amount from 1 to 10 percent by weight with said finely divided water-insoluble solid, in an aqueous medium having a pH range above 6.5 and dispersing said solid in said aqueous medium in the presence of said resin.
Claim 5
Dependent Claim
21 words
The method as defined in claim 1 and wherein the aqueous medium has a hardness between 0* and 40* German hardness.
Claim 6
Dependent Claim
57 words
The method as defined in claim 1 wherein said sodium sulfonate or sodium sulfite groups are converted to free acid groups by ion exchange which are further converted to the salts of potassium, ammonium, magnesium, calcium, barium, pyridine, morpholine, or triethanolamine and said resin is then admixed with said finely divided, water-insoluble solid, sought to be dispersed.
Claim 7
Dependent Claim
20 words
The method as defined in claim 1 and wherein said resin is used in combination with a non-ionic wetting agent.
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) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |