US4038255A
Expired / Lapsed
US
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Linear polyesters based on n,n-heterocyclic dicarboxylic acids
Assignee: Novartis Corp
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Filing: 1975-11-20
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Granted: 1977-07-26
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Expires: 1995-11-20
Abstract
Abstract New homopolyesters and copolyesters are obtained by polycondensing dicarboxylic acid derivatives which contain a N,N-heterocyclic radical and which are manufactured from cyclic ureides and 4-halogenomethylbenzoic acid derivatives, and, if appropriate terephthalic acid of isophthalic acid derivatives, with alkanediols and/or N,N-heterocyclic diols. The new polyesters, which are distinguished by valuable toughness and high Tg values, are particularly suitable for use as "engineering plastics" materials.
Inventors
- 👤 Jurgen Habermeier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:51
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/685; C08G63/6854; C08G63/6856
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
168 words
A linear, thermoplastic polyester having a relative viscosity of 1.2 to 3.0, measured at 30° C. on a 1% strength solution consisting of equal parts of phenol and tetrachloroethane, which is characterised by the structural elements of the general formula I ##STR21## wherein R denotes a N,N-heterocyclic radical of the formula ##STR22## wherein R 1 and R 2 independently of one another each denote hydrogen or an alkyl having 1 to 3 C atoms, R 3 denotes hydrogen or methyl, A denotes an aliphatic radical having 2 to 6 C atoms, a N,N'-heterocyclic-aliphatic radical of the formula ##STR23## or the formula ##STR24## wherein R 1 and R 2 have the same meaning as above and R' and R" represent H, chlorine or bromine atoms or R' represents a H atom and R" represents a chlorine or bromine atom, D denotes meta- or para-phenylene and x and y represent integers, and the mol fraction x/(x + y) derived from x and y can have values from 0.05 to 1.0.
Claim 2
Dependent Claim
168 words
A linear, thermoplastic polyester having a relative viscosity of 1.2 to 3.0, measured at 30° C. on a 1% strength solution consisting of equal parts of phenol and tetrachloroethane, which is characterised by the structural elements of the general formula I ##STR21## wherein R denotes a N,N-heterocyclic radical of the formula ##STR22## wherein R 1 and R 2 independently of one another each denote hydrogen or an alkyl having 1 to 3 C atoms, R 3 denotes hydrogen or methyl, A denotes an aliphatic radical having 2 to 6 C atoms, a N,N'-heterocyclic-aliphatic radical of the formula ##STR23## or the formula ##STR24## wherein R 1 and R 2 have the same meaning as above and R' and R" represent H, chlorine or bromine atoms or R' represents a H atom and R" represents a chlorine or bromine atom, D denotes meta- or para-phenylene and x and y represent integers, and the mol fraction x/(x + y) derived from x and y can have values from 0.05 to 1.0.
Claim 3
Dependent Claim
48 words
A polyester according to claim 1 wherein, in the formula I, R denotes a N,N-heterocyclic radical of the formula ##STR25## or the formula ##STR26## and A denotes an aliphatic radical having 2 to 6 C atoms or a N,N'-heterocyclic-aliphatic radical of the formula ##STR27## or the formula ##STR28##
Claim 4
Dependent Claim
109 words
A polyester according to claim 1 having a relative viscosity of 1.3 to 2.5, characterised in that, in the formula I, R denotes a N,N-heterocyclic radical of the formula ##STR29## or the formula ##STR30## A denotes an aliphatic radical having 2 to 4 C atoms, or a N,N'-heterocyclic-aliphatic radical of the formula ##STR31## or the formula ##STR32## wherein R' and R" represent H, chlorine or bromine atoms or R' represents a H atom and R" represents a chlorine or bromine atom, D denotes para-phenylene and x and y represent integers, and the mol fraction x/(x + y) derived from x and y can have values from 0.1 to 0.95.
Claim 5
Dependent Claim
17 words
A homopolyester according to claim 1 and characterised by the recurring structural element of the formula ##STR33##
Claim 6
Dependent Claim
17 words
A homopolyester according to claim 1 and characterised by the recurring structural element of the formula ##STR34##
Claim 7
Dependent Claim
17 words
A homopolyester according to claim 1 and characterised by the recurring structural element of the formula ##STR35##
Claim 8
Dependent Claim
16 words
A copolyester according to claim 1 and consisting of the structural elements of the formulae ##STR36##
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 |