Patent US4038229A successfully refreshed from Google Patents.
US4038229A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of impregnating melamine resins
Assignee: BASF SE
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Filing: 1975-06-12
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Granted: 1977-07-26
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Expires: 1995-06-12
Abstract
Abstract Aqueous impregnating resins based on a condensate of melamine and formaldehyde containing a lower fatty acid dialkyl amide such as dimethyl acetamide either in solution or as part of the condensate, and a process for the manufacture thereof.
Inventors
- 👤 Wolfgang Eisele
- 👤 Ludwig Lelgemann
- 👤 Bernhard Magerkurth
- 👤 Harro Petersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:36
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/26; C08G12/34; C08G12/30; C08G12/32; C08K; C08K5/00; C08K5/16; C08K5/20; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31942; Y10T428/31949; Y10T428/31957; Y10T428/31964
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
115 words
In a process for the manufacture of impregnating resins based on precondensates of melamine and formaldehyde, wherein melamine and formaldehyde are condensed at a molar ratio of melamine to formaldehyde of from 1:1.6 to 1:6 in aqueous solution, the improvement comprising the addition of a fatty acid dialkyl amide which is soluble in the aqueous impregnating resin solution and has the formula ##STR2## where R 1 is hydrogen or lower alkyl and R 2 and R 3 are alkyl of from 1 to 4 carbon atoms, to the aqueous solution before, during or after condensation in an amount of from 1 to 20% by weight, based on the melamine/formaldehyde precondensate content of the aqueous solution.
Claim 2
Dependent Claim
115 words
In a process for the manufacture of impregnating resins based on precondensates of melamine and formaldehyde, wherein melamine and formaldehyde are condensed at a molar ratio of melamine to formaldehyde of from 1:1.6 to 1:6 in aqueous solution, the improvement comprising the addition of a fatty acid dialkyl amide which is soluble in the aqueous impregnating resin solution and has the formula ##STR2## where R 1 is hydrogen or lower alkyl and R 2 and R 3 are alkyl of from 1 to 4 carbon atoms, to the aqueous solution before, during or after condensation in an amount of from 1 to 20% by weight, based on the melamine/formaldehyde precondensate content of the aqueous solution.
Claim 3
Dependent Claim
33 words
A process as claimed in claim 1, wherein an amide of the general formula stated in claim 1 in which R 1 is alkyl of from 1 to 4 carbon atoms is used.
Claim 4
Dependent Claim
93 words
An aqueous impregnating resin solution which comprises: a precondensate of melamine and formaldehyde at a molar ratio of from 1:1.6 to 1:6; and a soluble fatty acid dialkyl amide of the formula ##STR3## where R 1 is hydrogen or lower alkyl and R 2 and R 3 are alkyl of from 1 to 4 carbon atoms, the amount of said amide being from 1 to 20% by weight based on the melamine/formaldehyde precondensate content of the aqueous solution, the solids content of said aqueous solution being from about 30 to 70% by weight.
Claim 5
Dependent Claim
93 words
An aqueous impregnating resin solution which comprises: a precondensate of melamine and formaldehyde at a molar ratio of from 1:1.6 to 1:6; and a soluble fatty acid dialkyl amide of the formula ##STR3## where R 1 is hydrogen or lower alkyl and R 2 and R 3 are alkyl of from 1 to 4 carbon atoms, the amount of said amide being from 1 to 20% by weight based on the melamine/formaldehyde precondensate content of the aqueous solution, the solids content of said aqueous solution being from about 30 to 70% by weight.
Claim 6
Dependent Claim
32 words
A resin solution as set forth in claim 3 wherein the amount of said amide is from 3 to 10% by weight based on the melamine/formaldehyde precondensate content of the aqueous solution.
Claim 7
Dependent Claim
23 words
A resin solution as set forth in claim 3 wherein the solids content of said solution is from 50 to 60% by weight.
Claim 8
Dependent Claim
19 words
A resin solution as set forth in claim 3 wherein the molar ratio of melamine/formaldehyde is 1:6 to 1:3.
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) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |