US4728713A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wholly aromatic mesomorphic polyester imides and the preparation thereof
Assignee: BASF SE
•
Filing: 1986-12-04
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Granted: 1988-03-01
•
Expires: 2006-12-04
Abstract
Abstract Wholly aromatic mesomorphic polyester imides which form a liquid-crystalline fiber-forming melt below 320° C. and are composed of (a) from 5 to 35 mole % of repeat units of the formulae I and/or II ##STR1## where the Xs and n's can be identical or different, each X being --O--, --S--, --SO 2 --, --CO--, --CH 2 -- or ═C(CH 3 ) 2 and n being 0 or 1, (b) from 0 to 30 mole % of repeat units of the formulae III and/or IV ##STR2## (c) a molar amount corresponding to the total amount of components a and b of one or more of the repeat units of the formulae V, VI, VII or VIII ##STR3## (d) not less than 10 mole % of repeat units of the formula IX ##STR4## (e) if desired from 5 to 25 mole % of repeat units of the formula X ##STR5## the molar proportions of components a, b, c, d, and e adding up to 100 mole % in each case, and the preparation thereof.
Inventors
- 👤 Bernd Hisgen
- 👤 Michael Portugall
- 👤 Udo Reiter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:12
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/16
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
169 words
A wholly aromatic mesomorphic polyester imide which forms a liquid-crystalline fiber-forming melt below 320° C. and is composed of (a) from 5 to 35 mole % of repeat units of the formulae I and/or II ##STR22## where the Xs and N's can be identical or different, each X being --O--, --S--, --SO 2 --, --CO--, --CH 2 -- or ═C(CH 3 ) 2 and n being 0 or 1, (b) from 0 to 30 mole % of repeat units of the formulae III and/or IV ##STR23## (c) a molar amount corresponding to the total amount of components a and b of one or more of the repeat units of the formula V, VI, VII or VIII ##STR24## (d) not less than 10 mole % of repeat units of the formula IX ##STR25## (e) if desired from 5 to 25 mole % of repeat units of the formula X ##STR26## the molar proportions of components a, b, c, d, and e adding up to 100 mole % in each case.
Claim 2
Dependent Claim
169 words
A wholly aromatic mesomorphic polyester imide which forms a liquid-crystalline fiber-forming melt below 320° C. and is composed of (a) from 5 to 35 mole % of repeat units of the formulae I and/or II ##STR22## where the Xs and N's can be identical or different, each X being --O--, --S--, --SO 2 --, --CO--, --CH 2 -- or ═C(CH 3 ) 2 and n being 0 or 1, (b) from 0 to 30 mole % of repeat units of the formulae III and/or IV ##STR23## (c) a molar amount corresponding to the total amount of components a and b of one or more of the repeat units of the formula V, VI, VII or VIII ##STR24## (d) not less than 10 mole % of repeat units of the formula IX ##STR25## (e) if desired from 5 to 25 mole % of repeat units of the formula X ##STR26## the molar proportions of components a, b, c, d, and e adding up to 100 mole % in each case.
Claim 3
Dependent Claim
103 words
A wholly aromatic mesomorphic polyester imide as claimed in claim 1, composed of (a) from 7 to 31 mol % of repeat units of the formulae I and/or II (b) from 0 to 20 mol % of repeat units of the formulae III and/or IV (c) a molar amount corresponding to the total amount of components a and b of one or more of the repeat units of the formula V, VI, VII or VIII (d) not less than 20 mol % of repeat units of the formula IX (e) from 10 to 20 mol % of repeat units of the formula X.
Claim 4
Dependent Claim
46 words
A wholly aromatic mesomorphic polyester imide as claimed in claim 1, which contains as component c from 10 to 31 mol % of repeat units of the formula V and/or from 5 to 25 mol % of repeat units of the formulae VI, VII and/or VIII.
Claim 5
Dependent Claim
28 words
A wholly aromatic mesomorphic polyester imide as claimed in claim 1, which contains as component c repeat units of the formulae V, VI and/or VII or mixtures thereof.
Claim 6
Dependent Claim
19 words
A wholly aromatic mesomorphic polyester imide as claimed in claim 1, which has a glass transition temperature Tg=140° C.
Claim 7
Dependent Claim
63 words
A process for preparing a wholly aromatic mesomorphic polyester imide as claimed in claim 1 by reacting the starting materials in the form of the underivatized hydroxy and carboxy compounds in a single-stage process in the molar ratios described in the presence of excess fatty acid anhydride at elevated temperature and distilling fatty acid anhydride and fatty acid out of the reaction mixture.
Claim 8
Dependent Claim
28 words
A process as claimed in claim 6, wherein the wholly aromatic polyester imide, after the condensation in the melt, is postcondensed in the solid phase at 150°-250° C.
Claim 9
Dependent Claim
11 words
A fiber from a polyester imide as claimed in claim 1.
Claim 10
Dependent Claim
11 words
A film from a polyester imide as claimed in claim 1.
Claim 11
Dependent Claim
11 words
A molding from a polyester imide as claimed in claim 1.
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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) | 1991-03-01 | 1991-08-31 | 1992-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-01 | 1995-08-31 | 1996-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-01 | 1999-08-31 | 2000-03-01 | $7700.00 | Window Closed / Lapsed |