Patent US3978028A successfully refreshed from Google Patents.
US3978028A
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Process for preparing s-triazine prepolymers by condensation of an aromatic polyhydroxy compound with cyanuric chloride and thereafter reacting the condensation product with cyanogen halide in the presence of base
Assignee: Bayer AG
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Filing: 1974-12-04
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Granted: 1976-08-31
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Expires: 1994-12-04
Abstract
Abstract S-Triazine prepolymers, useful in the preparation of polytriazines, are prepared by condensing an aromatic dihydroxy or polyhydroxy compound with less than one-third mol of cyanuric chloride per hydroxy group. Thereafter the free hydroxy groups in the condensation product are reacted with a cyanogen halide in the presence of a base. The condensation is preferably carried out in a melt at temperatures of from 100°-240°C.
Inventors
- 👤 Rudolf Sundermann
- 👤 Rolf Putter
- 👤 Ernst Grigat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:15
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/0622; C08G73/0638; C08G73/065
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
48 words
Process for preparing s-triazine prepolymers which comprises contacting under condensation conditions an aromatic dihydroxy or polyhydroxy compound with less than 1/3 mol of cyanuric chloride per hydroxy group, thereafter reacting the free hydroxy groups in the condensation product with a cyanogen halide in the presence of a base.
Claim 2
Dependent Claim
48 words
Process for preparing s-triazine prepolymers which comprises contacting under condensation conditions an aromatic dihydroxy or polyhydroxy compound with less than 1/3 mol of cyanuric chloride per hydroxy group, thereafter reacting the free hydroxy groups in the condensation product with a cyanogen halide in the presence of a base.
Claim 3
Dependent Claim
21 words
Process of claim 1 wherein the condensation is carried out in the melt at a temperature of from 100° to 250°C.
Claim 4
Dependent Claim
12 words
Process of claim 2 wherein the temperature is from 150° to 200°C.
Claim 5
Dependent Claim
42 words
Process of claim 1 wherein the condensation is carried out in solution and/or suspension in the presence of substantially 1 mol of base per mol of hydrogen chloride to be eliminated at a temperature in the range of from 0° to 150°C.
Claim 6
Dependent Claim
12 words
Process of claim 4 wherein the temperature is from 0° to 100°C.
Claim 7
Dependent Claim
35 words
Process of claim 1 wherein the reaction of the condensation product with the cyanogen halide is carried out in the presence of a base at a temperature in the range of from -40° to +65°.
Claim 8
Dependent Claim
12 words
Process of claim 6 wherein the temperature is from 0° to 30°C.
Claim 9
Dependent Claim
64 words
Process of claim 1 wherein the aromatic dihydroxy or polyhydroxy compound has the formula ##SPC6## wherein R which may be the same or different is hydrogen, halogen, alkyl or phenyl; or two R's may substitute adjacent carbon atoms and form with those carbon atoms a carbocyclic or heterocyclic 5-membered or 6-membered ring; a is 1, 2 or 3; and b is 5 minus a.
Claim 10
Dependent Claim
110 words
Process of claim 1 wherein the aromatic dihydroxy or polyhydroxy compound has the formula ##SPC7## wherein A is oxygen; a sulpho group (SO 2 ); a carbonyl group (CO); a CH 2 -chain with up to 6 carbon atoms optionally substituted by at least one lower alkyl radical or phenyl; a divalent cycloaliphatic or aromatic 5-membered or 6-membered ring; or a single bond; R 1 is the same as R in claim 8 or is the group ##SPC8## wherein A and R are as defined previously; e is 1, 2 or 3; and f is 5 minus e; c is 5 minus d; and d is 1, 2 or 3.
Claim 11
Dependent Claim
17 words
Process of claim 9 wherein A is a CH 2 -chain with up to 3 carbon atoms.
Claim 12
Dependent Claim
11 words
Process of claim 9 wherein the lower alkyl radical is methyl.
References Cited (Backward Citations)
US3297639A
Cited
GB1305762A
Cited
US3729471A
Cited
US3775411A
Cited
US3738962A
Cited
US3784504A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-31 | 1980-03-01 | 1980-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-31 | 1984-03-01 | 1984-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-31 | 1988-03-01 | 1988-08-31 | $7700.00 | Window Closed / Lapsed |