Patent US4066577A successfully refreshed from Google Patents.
US4066577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High molecular weight polytriazines of soluble polymeric n-cyano-isourea ethers
Assignee: Bayer AG
•
Filing: 1976-07-22
•
Granted: 1978-01-03
•
Expires: 1996-07-22
Abstract
Abstract High molecular weight temperature-resistant polymers of polytriazine structure obtained by heating cyanamides of the formula I r -- (nh-cn).sub.n in which R represents an aliphatic, cycloaliphatic, heterocyclic or aromatic radical, optionally interrupted by oxygen and n is a number from 2 to 5, with polyfunctional, aromatic cyanic acid esters into a fusible or in organic solvents soluble polymeric N-cyano-isourea ether and completing the reaction at elevated temperatures and optionally in the presence of a catalyst to form said polymer of polytriazine structure.
Inventors
- 👤 Rudolf Sundermann
- 👤 Gunther Rottloff
- 👤 Ernst Grigat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:32
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/0622; C08G73/0638; C08G73/065; C08G73/0655
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
65 words
A mixture which can be converted into a high molecular weight polymer of polytriazine structure which is substantially insoluble in solvents, the mixture comprising: A. a cyanamide corresponding to the general formula (I): r (nh-cn).sub.n (I) in which R represents an aliphatic, cycloaliphatic, heterocyclic or aromatic radical optionally interrupted by at least one oxygen atom, and n is a number from 2 to 5, and
Claim 2
Dependent Claim
65 words
A mixture which can be converted into a high molecular weight polymer of polytriazine structure which is substantially insoluble in solvents, the mixture comprising: A. a cyanamide corresponding to the general formula (I): r (nh-cn).sub.n (I) in which R represents an aliphatic, cycloaliphatic, heterocyclic or aromatic radical optionally interrupted by at least one oxygen atom, and n is a number from 2 to 5, and
Claim 3
Dependent Claim
40 words
B. an aromatic cyanic acid ester corresponding to the general formula (II): ar (OCN).sub.p (II) in which Ar represents an aromatic radical or an aromatic radical interrupted by a bridge member and p is a number from 2 to 5.
Claim 4
Dependent Claim
40 words
B. an aromatic cyanic acid ester corresponding to the general formula (II): ar (OCN).sub.p (II) in which Ar represents an aromatic radical or an aromatic radical interrupted by a bridge member and p is a number from 2 to 5.
Claim 5
Dependent Claim
28 words
A mixture as claimed in claim 1, which comprises from 30 to 70 mol % of component A and from 70 to 30 mol % of component B.
Claim 6
Dependent Claim
87 words
A process for the production of a high molecular weight polymer of polytriazine structure, which comprises reacting a mixture as claimed in claim 1, at an elevated temperature, optionally in the presence of a catalyst to form a prepolymer soluble in organic solvents or a fusible prepolymer (polymeric N-cyano-isourea ether), and allowing the prepolymer to react to completion at an elevated temperature and optionally in the presence of a catalyst to form the desired high molecular weight polymer of polytriazine structure which is substantially insoluble in solvents.
Claim 7
Dependent Claim
26 words
A process as claimed in claim 3, wherein the reaction to form the prepolymer is carried out at a temperature of from 30° tp 150° C.
Claim 8
Dependent Claim
19 words
A process as claimed in claim 3, wherein the prepolymer at a temperature of from 150° to 350° 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) | 1981-01-02 | 1981-07-04 | 1982-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-02 | 1985-07-04 | 1986-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-02 | 1989-07-04 | 1990-01-03 | $7700.00 | Window Closed / Lapsed |