US4430469A
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US
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Process for preparing highly concentrated aqueous solutions of low viscosity of melamine/aldehyde resins
Assignee: Sika Schweiz AG
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Filing: 1982-02-24
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Granted: 1984-02-07
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Expires: 2002-02-24
Abstract
Abstract Highly concentrated aqueous solutions of low viscosity of melamine/aldehyde resins are obtained by reacting to a precondensate in a first step melamine and an aldehyde in an alkaline medium and in the presence of water together with at least one compound (I), selected from the group, consisting of an alkali sulfite, an alkaline earth sulfite, an amino sulfonic acid, an amino carboxylic acid, a hydroxycarboxylic acid, a hydroxycarboxylic acid lactone, and a polyhydroxy carboxylic acid lactone, reacting then the thus obtained mixture in a second step with at least one compound (II), selected from the group, consisting of an amino carboxylic acid, a carboxylic acid, a hydroxy carboxylic acid, a hydroxy carboxylic acid lactone, a sulfamic acid, an amino sulfonic acid, a polyhydroxy carboxylic acid and a polyhydroxy carboxylic acid lactone, and then making alkaline the obtained resin solution by adding at least one basic compound (III). The resin solutions prepared according to this invention may be used as added substances for improving the quality of building materials containing inorganic binders.
Inventors
- 👤 Theodor A. Burge
- 👤 Jurg Widmer
- 👤 Theodor Meyer
- 👤 Ulrich Sulser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:37
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/16; C04B24/20; C04B24/22; C04B24/24; C04B24/28; C04B24/30; C04B24/305; C08; C08G; C08G12/00; C08G12/02; C08G12/26; C08G12/30; C08G12/32; C08G12/34; C08G12/40; C08L; C08L61/00; C08L61/20; C08L61/26; C08L61/28
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
150 words
A process for preparing highly concentrated aqueous solutions of low viscosity of melamine/aldehyde resins, characterized by reacting to a precondensate in a first step melamine and an aldehyde in an alkaline medium and in the presence of water together with at least one compound (I), selected from the group, consisting of an alkali sulfite, an alkaline earth sulfite, an amino sulfonic acid, an amino carboxylic acid, a hydroxycarboxylic acid, a hydroxycarboxylic acid lactone, and a polyhydroxy carboxylic acid lactone reacting then the thus obtained mixture in a second step with at least one compound (II), selected from the group, consisting of an amino carboxylic acid, a carboxylic acid, a hydroxy carboxylic acid, a hydroxy carboxylic acid lactone, including sulfamic acid, an amino sulfonic acid, a polyhydroxy carboxylic acid and a polyhydroxy carboxylic acid lactone, and then making alkaline the obtained resin solution by adding at least one basic compound (III).
Claim 2
Dependent Claim
150 words
A process for preparing highly concentrated aqueous solutions of low viscosity of melamine/aldehyde resins, characterized by reacting to a precondensate in a first step melamine and an aldehyde in an alkaline medium and in the presence of water together with at least one compound (I), selected from the group, consisting of an alkali sulfite, an alkaline earth sulfite, an amino sulfonic acid, an amino carboxylic acid, a hydroxycarboxylic acid, a hydroxycarboxylic acid lactone, and a polyhydroxy carboxylic acid lactone reacting then the thus obtained mixture in a second step with at least one compound (II), selected from the group, consisting of an amino carboxylic acid, a carboxylic acid, a hydroxy carboxylic acid, a hydroxy carboxylic acid lactone, including sulfamic acid, an amino sulfonic acid, a polyhydroxy carboxylic acid and a polyhydroxy carboxylic acid lactone, and then making alkaline the obtained resin solution by adding at least one basic compound (III).
Claim 3
Dependent Claim
33 words
The process according to claim 1, characterized in that the melamine, the aldehyde and the compound (I) are used in the first step in a molar ratio from 1:3.5 to 6:0.5 to 1.
Claim 4
Dependent Claim
27 words
The process according to any one of claims 1 or 2, characterized in that the first step is realized at a pH value from 9.0 to 13.0.
Claim 5
Dependent Claim
23 words
The process according to claim 3, characterized in that the first step is realized at a temperature from 75° C. to 100° C.
Claim 6
Dependent Claim
42 words
The process according to claim 4, characterized in that in the second step the precondensate from the first step and the compound (II) are used in a molar ratio from 1:0.1 to 3, relative to the melamine used in the first step.
Claim 7
Dependent Claim
22 words
The process according to claim 5, characterized in that the second step is realized at a pH value from 5.5 to 7.0.
Claim 8
Dependent Claim
23 words
The process according to claim 6, characterized in that the second step is realized at a temperature from 75° C. to 100° C.
Claim 9
Dependent Claim
54 words
The process according to claim 7, characterized in that a compound as basic compound (III) is used, selected from the group, consisting of an alkali hydroxide, an alkaline earth oxide, an alkaline earth hydroxide, ammonium hydroxide, a monoamine, a polyamine, monoethanol amine, diethanol amine, triethanol amine and a basic compound of a transition metal.
Claim 10
Dependent Claim
20 words
The process according to claim 8, characterized in that a basic alumina- or zinc-compound is used as basic compound (III).
Claim 11
Dependent Claim
32 words
The process according to claim 9, characterized in that aqueous resin solutions are prepared having a solids content from 30 to 50% by weight and a viscosity from 5 to 250 centipoise.
Claim 12
Dependent Claim
13 words
The process according to claim 10, characterized in that the aldehyde is formaldehyde.
Claim 13
Dependent Claim
23 words
The process according to claim 1, characterized in that the first step is realized at a temperature from 75° C. to 100° C.
Claim 14
Dependent Claim
42 words
The process according to claim 1, characterized in that in the second step the precondensate from the first step and the compound (II) are used in a molar ratio from 1:0.1 to 3, relative to the melamine used in the first step.
Claim 15
Dependent Claim
22 words
The process according to claim 1, characterized in that the second step is realized at a pH value from 5.5 to 7.0.
Claim 16
Dependent Claim
23 words
The process according to claim 1, characterized in that the second step is realized at a temperature from 75° C. to 100° C.
Claim 17
Dependent Claim
54 words
The process according to claim 1, characterized in that a compound as basic compound (III) is used, selected from the group, consisting of an alkali hydroxide, an alkaline earth oxide, an alkaline earth hydroxide, ammonium hydroxide, a monoamine, a polyamine, monoethanol amine, diethanol amine, triethanol amine and a basic compound of a transition metal.
Claim 18
Dependent Claim
20 words
The process according to claim 1, characterized in that a basic alumina- or zinc-compound is used as basic compound (III).
Claim 19
Dependent Claim
32 words
The process according to claim 1, characterized in that aqueous resin solutions are prepared having a solids content from 30 to 50% by weight and a viscosity from 5 to 250 centipoise.
Claim 20
Dependent Claim
13 words
The process according to claim 1, characterized in that the aldehyde is formaldehyde.
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) | 1987-02-06 | 1987-08-08 | 1988-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-06 | 1991-08-08 | 1992-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-06 | 1995-08-08 | 1996-02-07 | $7700.00 | Window Closed / Lapsed |