US4163835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of electrolyte-free aminoplast resins
Assignee: Sanofi Aventis Deutschland GmbH
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Filing: 1977-01-19
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Granted: 1979-08-07
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Expires: 1997-01-19
Abstract
Abstract Electrolyte-free etherified methylolaminotriazines are directly prepared by reacting together in the absence of electrolyte, the aminotriazine, formaldehyde and certain ether-alcohols. When the formaldehyde to aminotriazine mol ratio is sufficiently high and the etherification sufficiently extensive, the resulting products are particularly desirable in that they are quite stable and thermoset to exceptionally elastic, cured products having high electrical, moisture, and temperature resistance.
Inventors
- 👤 Steffen Piesch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:11
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/40; C08G12/42; C07; C07D; C07D251/00; C07D251/02; C07D251/12; C07D251/26; C07D251/40; C07D251/54; C07D251/64; C08L; C08L61/00; C08L61/20; C08L61/32
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
119 words
A process for the manufacture of an electrolyte-free etherified methylolaminotriazine, wherein in the absence of electrolyte the aminotriazine is condensed with from about 1.3 mols to 2 n mols of formaldehyde per mol of aminotriazine where n is the number of amino groups in the aminotriazine, in an excess of etherifiying alcohol having the formula R--(OCH.sub.2 CH.sub.2).sub.m OH r denoting an alkyl group with 1 to 4 C atoms and m representing an integer from 1 to 4, by heating such a condensation mixture having a water content of not over about 10% by weight to from about 50° to about 180° C. until the condensation has taken place and the degree of etherification is at least about 33%.
Claim 2
Dependent Claim
119 words
A process for the manufacture of an electrolyte-free etherified methylolaminotriazine, wherein in the absence of electrolyte the aminotriazine is condensed with from about 1.3 mols to 2 n mols of formaldehyde per mol of aminotriazine where n is the number of amino groups in the aminotriazine, in an excess of etherifiying alcohol having the formula R--(OCH.sub.2 CH.sub.2).sub.m OH r denoting an alkyl group with 1 to 4 C atoms and m representing an integer from 1 to 4, by heating such a condensation mixture having a water content of not over about 10% by weight to from about 50° to about 180° C. until the condensation has taken place and the degree of etherification is at least about 33%.
Claim 3
Dependent Claim
23 words
The process of claim 1 in which the condensation mixture contains up to about 20 mols etherifying alcohol per mol of the aminotriazine.
Claim 4
Dependent Claim
20 words
The process of claim 2, wherein at least about 1.8 mols of formaldehyde are condensed per mol of the aminotriazine.
Claim 5
Dependent Claim
20 words
The process of claim 2, wherein the heating is continued until the degree of etherification is at least about 50%.
Claim 6
Dependent Claim
34 words
The process of claim 2, wherein the aminotriazine is a diaminotriazine or a triaminotriazine, and from about 1.8 mols to 1.2 n mols of formaldehyde are condensed per mol of the diaminotriazine or triaminotriazine.
Claim 7
Dependent Claim
9 words
The process of claim 1 wherein R is methyl.
Claim 8
Dependent Claim
11 words
The process of claim 1 wherein m is 1 or 2.
Claim 9
Dependent Claim
10 words
The process of claim 1 wherein the aminotraazine is melamine.
Claim 10
Dependent Claim
18 words
The process of claim 1 wherein the heating is effected at from about 80° to about 140° C.
Claim 11
Dependent Claim
30 words
The process of claim 1 in which the heating is followed by boiling off volatiles to leave a residue containing at least 25% by weight of the etherified condensation product.
Claim 12
Dependent Claim
24 words
The process of claim 1 in which the heating is conducted in a manner that causes water in the mixture to be boiled away.
Claim 13
Dependent Claim
35 words
The process of claim 11 in which the condensation mixture is anhydrous when the heating is started, and the quantity of water boiled away during the heating is measured to determine the degree of etherification.
References Cited (Backward Citations)
CA474160A
Cited
US3965058A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-08-06 | 1983-02-05 | 1983-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-06 | 1987-02-05 | 1987-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-06 | 1991-02-05 | 1991-08-07 | $7700.00 | Window Closed / Lapsed |