USRE28495E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Poly(hexasubstituted melamines)
Assignee: —
•
Filing: 1974-06-06
•
Granted: 1975-07-29
•
Expires: 1994-06-06
Abstract
Abstract Poly(hexasubstituted melamines) prepared by the Lewis acid catalyzed polymerization of alkylene bis-(N-substituted cyanamides) of the formula wherein R1 and R2 are broadly alkyl or aryl and R3 is alkylene, such polymers being curable to a storable B-stage as well as fully cured condition, having excellent high temperature stability and being useful as structural adhesives or binders.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:55
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/0622; C08G73/0638; C08G73/0644
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
8 words
POLY(HEXASUBSTITUTED MELAMINES) CONSISTING OF SEGMENTS HAVING THE FORMULA
Claim 2
Dependent Claim
8 words
POLY(HEXASUBSTITUTED MELAMINES) CONSISTING OF SEGMENTS HAVING THE FORMULA
Claim 3
Dependent Claim
10 words
Polymer according to claim 1 in thermoset, insoluble, cured form.
Claim 4
Dependent Claim
23 words
''''B''''-stage polymer according to claim 1, in thermoplastic, chlorinated hydrocarbon-soluble form, being capable of further curing to thermoset condition upon further heating thereof.
Claim 5
Dependent Claim
12 words
Polymer according to claim 4, wherein R3 is hexamethylene, tetramethylene or trimethylene.
Claim 6
Dependent Claim
11 words
Polymer according to claim 4, wherein R2 is methyl or ethyl.
Claim 7
Dependent Claim
27 words
Polymer according to claim 1, wherein R1, R2 and R3, taken with the two nitrogen atoms to which they are attached, form a divalent 1,3-bis-(4-(1-piperidyl)) trimethylene radical.
Claim 8
Dependent Claim
20 words
''''B''''-stage polymer according to claim 3, in which R2 is methyl or ethyl and R3 is hexamethylene, tetramethylene or trimethylene.
Claim 9
Dependent Claim
13 words
Polymer according to claim 1, consisting essentially of repeating units having the formula
Claim 10
Dependent Claim
9 words
Polymer according to claim 8, wherein n is 3.
Claim 11
Dependent Claim
9 words
Polymer according to claim 8, wherein n is 6.
Claim 12
Dependent Claim
13 words
Polymer according to claim 1, consisting essentially of repeating units having the formula
Claim 13
Dependent Claim
24 words
Process for making polymers according to claim 1, which comprises heating, in the presence of a Lewis acid catalyst, a compound of the formula
Claim 14
Dependent Claim
11 words
A poly(hexasubstituted melamine) consisting essentially of repeating units having the formula:
Claim 15
Dependent Claim
11 words
A poly(hexasubstituted melamine) consisting essentially of repeating units having the formula:
References Cited (Backward Citations)
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Cited
US3155628A
Cited
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Cited
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Cited
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Cited
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Cited
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Cited
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Cited
US3775380A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |