US4346208A
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US
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Anisotropic melts which can be shaped, based on aromatic polyesters, and articles formed from these melts
Assignee: Rhone Poulenc Industries SA
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Filing: 1980-09-11
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Granted: 1982-08-24
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Expires: 2000-09-11
Abstract
Abstract Anisotropic melts are disclosed which can be shaped, based on aromatic polyesters containing linkages of the arylaliphatic ether type. These melts consist of homopolyesters having units of the formulae: ##STR1## in which n equals 4 or 6 and X=H, Cl or CH 3 , with the proviso that when n equals 4, X only represents Cl or CH 3 , the flow points of these polymers being between 200° and 340° C. These anisotropic melts make it possible to obtain filaments, films and molded articles possessing good mechanical properties.
Inventors
- 👤 Bernard Fayolle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:29
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/682; C08G63/6824; C08G63/6826; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/19; C08G63/66; C08G63/668; C08G63/672
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
74 words
Anisotropic melts which can be shaped, based on aromatic polyesters, characterised in that they are prepared by fusion of a homopolyester possessing the following characteristics: they consist essentially of repeat units of the formulae: ##STR7## in which: n=4 and X represents a methyl group or a chlorine atom, or n=6 and X represents a hydrogen atom, a methyl group or a chlorine atom; and they have flow points between 200° C. and 340° C.
Claim 2
Dependent Claim
74 words
Anisotropic melts which can be shaped, based on aromatic polyesters, characterised in that they are prepared by fusion of a homopolyester possessing the following characteristics: they consist essentially of repeat units of the formulae: ##STR7## in which: n=4 and X represents a methyl group or a chlorine atom, or n=6 and X represents a hydrogen atom, a methyl group or a chlorine atom; and they have flow points between 200° C. and 340° C.
Claim 3
Dependent Claim
18 words
Melts according to claim 1, characterised in that the homopolyesters have flow points between 250° and 300° C.
Claim 4
Dependent Claim
25 words
A process for the production of shaped articles, such as filaments, films and molded articles, by shaping anisotropic melts according to claim 1 or 2.
Claim 5
Dependent Claim
30 words
A process for the production of shaped articles according to claim 3, characterised in that the anisotropic melts possess ranges of conversion temperatures spread over at least 30 centigrade degrees.
Claim 6
Dependent Claim
21 words
Shaped articles, such as filaments, films and molded articles, when produced from the anisotropic melts according to claim 3 or 4.
Claim 7
Dependent Claim
34 words
Molded articles according to claim 5, characterised in that they possess a flexural modulus of more than 200 daN/mm 2 and a torsional modulus at 140° C. of at least 20 daN/mm 2 .
Claim 8
Dependent Claim
22 words
Filaments according to claim 5, characterised in that they possess a modulus of elasticity of more than 500 cN/tex immediately after extrusion.
Claim 9
Dependent Claim
112 words
A process for the preparation of anisotropic molten masses according to claim 1 or 2, characterised in that homopolyesters are melted which have flow temperatures between 200° and 340° C., and which are obtained by reacting in substantially stoichiometric proportions: (A)--a diester derived from (a) an alkanoic acid having from 2 to 6 carbon atoms and (b) a diphenol of the formula: ##STR8## in which X represents an atom of hydrogen, a methyl group, or an atom of chlorine, with (B)--a dicarboxylic acid of formula: ##STR9## in which n equals 4 or 6 with the proviso that when n equals 4, X represents only a methyl group or an atom of chlorine.
Claim 10
Dependent Claim
99 words
A process for the preparation of anisotropic molten masses according to claim 1 or 2, characterised in that homopolyesters are melted which have flow temperatures between 200° and 340° C., and which are obtained by reacting, in substantially stoichiometric proportions: a diphenol of formula ##STR10## in which X represents a atom of hydrogen, a methyl group or an atom of chlorine with a diaryl dihalide or diester derived from an acid of formula: ##STR11## in which n equals 4 or 6 with the proviso that when n equals 4, X represents only a methyl group or a chlorine atom.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-23 | 1986-02-22 | 1986-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-23 | 1990-02-22 | 1990-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-23 | 1994-02-22 | 1994-08-24 | $7700.00 | Window Closed / Lapsed |