Patent US947709A successfully refreshed from Google Patents.
US4334053A
Expired / Lapsed
US
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Process for the preparation of aromatic polyesters and the use thereof for the production of injection molded articles, films and coatings
Assignee: Bayer AG
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Filing: 1980-09-29
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Granted: 1982-06-08
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Expires: 2000-09-29
Abstract
Abstract Aromatic polyesters based on diphenols, terephthalic and isophthalic acid and particular chain terminators exhibit an improved color number, an improved flowability and increased dimensional heat stability with otherwise comparable mechanical characteristics.
Inventors
- 👤 Dieter Freitag
- 👤 Klaus Reinking
- 👤 Karsten Idel
- 👤 Harald Medem
- 👤 Ludwig Bottenbruch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:22
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
96 words
Thermoplastic aromatic polyesters based on diphenols, terephthalic and isophthalic acid (acid ratio of from 7:3 to 3:7), chain terminators and optionally branching agents, characterised in that the chain terminators are compounds of the formula (I) ##STR6## wherein X represents OH, OCOCl or COCl and R represents a branched chain alkyl radical having 8 or 9 carbon atoms, provided that in the alkyl radical R 47 to 89% of the hydrogen atoms are part of methyl groups, that R is in the o- and/or p-position and the upper limit of the amount of the o-isomer is 20%.
Claim 2
Dependent Claim
96 words
Thermoplastic aromatic polyesters based on diphenols, terephthalic and isophthalic acid (acid ratio of from 7:3 to 3:7), chain terminators and optionally branching agents, characterised in that the chain terminators are compounds of the formula (I) ##STR6## wherein X represents OH, OCOCl or COCl and R represents a branched chain alkyl radical having 8 or 9 carbon atoms, provided that in the alkyl radical R 47 to 89% of the hydrogen atoms are part of methyl groups, that R is in the o- and/or p-position and the upper limit of the amount of the o-isomer is 20%.
Claim 3
Dependent Claim
19 words
Polyesters according to claim 1, characterised in that they have a relative solution viscosity of from 1.18 to 2.0.
Claim 4
Dependent Claim
21 words
Polyesters according to claim 1 or 2, characterised in that they have a relative solution viscosity of from 1.2 to 1.5.
Claim 5
Dependent Claim
21 words
Polyesters according to any of claims 1 to 3, characterised in that the chain terminators are compounds of the formulae: ##STR7##
Claim 6
Dependent Claim
65 words
A process for the preparation of the polyesters according to claims 1 to 4, according to the two-phase boundary surface process, characterised in that the compounds (I), optionally in a solvent, are introduced simultaneously with the terephthalic and isophthalic acid dichlorides or the solutions thereof into a stirred two phase mixture of an alkaline aqueous diphenolate solution, catalysts, and a solvent for the aromatic polyester.
Claim 7
Dependent Claim
23 words
A process according to claim 5, characterised in that the compounds (I) are used in quantities of from 0.1 to 10 mol %.
Claim 8
Dependent Claim
23 words
A process according to claim 6, characterised in that the compounds (I) are used in quantities of from 0.3 to 7 mol %.
Claim 9
Dependent Claim
26 words
A process according to claims 5 to 7, characterised in that the reaction is carried out at a temperature of from 0° C. to 40° C.
Claim 10
Dependent Claim
21 words
The use of the polyesters according to claims 1 to 4 for the production of injection moulded articles, films and coatings.
References Cited (Backward Citations)
US3160602A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-06-07 | 1985-12-07 | 1986-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-07 | 1989-12-07 | 1990-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-07 | 1993-12-07 | 1994-06-08 | $7700.00 | Window Closed / Lapsed |