US4363906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Condensation product prepared from N,N'-ethylene-urea and formaldehyde
Assignee: Montedison SpA
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Filing: 1981-04-02
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Granted: 1982-12-14
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Expires: 2001-04-02
Abstract
Abstract There is disclosed a solid and water-insoluble condensation product of N,N'-ethyleneurea with formaldehyde, having the structure <IMAGE> wherein n is an integer from 20 to 60 with a mean value of 41, and having an average number molecular weight Mn ranging from 2000 to 6000. Said product, when added to a polymer in combination with an ammonium phosphate, results in the production of articles which are resistant to heat and to thermo-oxidation.
Inventors
- 👤 Osvaldo Cicchetti
- 👤 Spartaco Fontani
- 👤 Gianluigi Landoni
- 👤 Renato Locatelli
- 👤 Guido Bertelli
- 👤 Pierpaolo Roma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:49
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3442; C08K5/3445; C08G; C08G12/00; C08G12/02; C08G12/26; C08K3/00; C08K3/32; C08L; C08L23/00; C08L23/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
44 words
A solid and water-insoluble condensation product of N,N'-ethyleneurea and formaldehyde, characterized by the structure ##STR3## wherein n is an integer from 20 to 60 having a mean value of 41, and by an average number molecular weight M n ranging from 2,000 to 6,000.
Claim 2
Dependent Claim
44 words
A solid and water-insoluble condensation product of N,N'-ethyleneurea and formaldehyde, characterized by the structure ##STR3## wherein n is an integer from 20 to 60 having a mean value of 41, and by an average number molecular weight M n ranging from 2,000 to 6,000.
Claim 3
Dependent Claim
21 words
The product according to claim 1, characterized in that it exhibits, under X-ray analysis, the spectrum of a prevailingly amorphous substance.
Claim 4
Dependent Claim
53 words
The process for producing the condensation product of claim 1, which comprises reacting in an aqueous medium, equimolecular amounts of N,N'-ethyleneurea and formaldehyde, at a pH of about 2 and at a temperature of from 0° C. to 40° C., the formaldehyde being added at any time provided the temperature is maintained constant.
Claim 5
Dependent Claim
18 words
The process of claim 3, in which the reaction is carried out at 25° C. to 30° C.
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) | 1985-12-13 | 1986-06-14 | 1986-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-13 | 1990-06-14 | 1990-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-13 | 1994-06-14 | 1994-12-14 | $7700.00 | Window Closed / Lapsed |