US4347350A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester compositions containing residues of dihydroxyalkoxy coumarins
Assignee: Imperial Chemical Industries Ltd
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Filing: 1980-11-28
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Granted: 1982-08-31
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Expires: 2000-11-28
Abstract
Abstract UV stable linear polyesters, e.g. polyethylene terephthalate, contain in their chain copolymerized esterification residues of di(hydroxyalkoxy)coumarins. The polyesters are useful for making biaxially oriented films. The polyesters can be made by polycondensation in the presence of 4-methyl-6,7-dihydroxy-coumarin.
Inventors
- 👤 Patrick J. Horner
- 👤 Robert B. Rashbrook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:12
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/66; C08G63/668; C08G63/672
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
41 words
A linear polyester which contains in its molecule esterification residues of di(hydroxyalkoxy)coumarins selected from the group consisting of 6,7-di(hydroxyalkoxy)-coumarin, 7,8-di-(hydroxyalkoxy)-coumarin, 5,7-di(hydroxyalkoxy)-coumarin, 4-methyl-6,7-di(hydroxyalkoxy)-coumarin, 4-methyl-7,8-di(hydroxyalkoxy)-coumarin and 4-methyl-5,7-di(hydroxyalkoxy)-coumarin, the amount of said residues being 0.05 to 10% by weight based on the total polymer.
Claim 2
Dependent Claim
41 words
A linear polyester which contains in its molecule esterification residues of di(hydroxyalkoxy)coumarins selected from the group consisting of 6,7-di(hydroxyalkoxy)-coumarin, 7,8-di-(hydroxyalkoxy)-coumarin, 5,7-di(hydroxyalkoxy)-coumarin, 4-methyl-6,7-di(hydroxyalkoxy)-coumarin, 4-methyl-7,8-di(hydroxyalkoxy)-coumarin and 4-methyl-5,7-di(hydroxyalkoxy)-coumarin, the amount of said residues being 0.05 to 10% by weight based on the total polymer.
Claim 3
Dependent Claim
26 words
A polyester according to claim 1, in which the amount of the said esterification residues is 0.05 to 5% by weight based on the total polymer.
Claim 4
Dependent Claim
76 words
A linear polyester which has as its repeating unit: --OYO--CO--X--CO-- wherein at least 80 mole % of the X groups represent p-phenylene and the remainder represent m-phenylene and at least 90% of the Y groups represent --C n H 2n -- where n is an integer from 2 to 10 and at least 0.1% of the Y groups represent esterification residues of di(hydroxyalkoxy)-coumarins selected from the group consisting of 6,7-di(hydroxyalkoxy)-coumarin, 7,8-di-(hydroxyalkoxy)-coumarin, 5,7-di(hydroxyalkoxy)-coumarin, 4-methyl-6,7-di(hydroxyalkoxy)-coumarin, 4-methyl-7,8-di(hydroxyalkoxy)-coumarin and 4-methyl-5,7-di(hydroxyalkoxy)-coumarin.
Claim 5
Dependent Claim
76 words
A linear polyester which has as its repeating unit: --OYO--CO--X--CO-- wherein at least 80 mole % of the X groups represent p-phenylene and the remainder represent m-phenylene and at least 90% of the Y groups represent --C n H 2n -- where n is an integer from 2 to 10 and at least 0.1% of the Y groups represent esterification residues of di(hydroxyalkoxy)-coumarins selected from the group consisting of 6,7-di(hydroxyalkoxy)-coumarin, 7,8-di-(hydroxyalkoxy)-coumarin, 5,7-di(hydroxyalkoxy)-coumarin, 4-methyl-6,7-di(hydroxyalkoxy)-coumarin, 4-methyl-7,8-di(hydroxyalkoxy)-coumarin and 4-methyl-5,7-di(hydroxyalkoxy)-coumarin.
Claim 6
Dependent Claim
28 words
A polyester according to claim 3, in which the residues are residues of 4-methyl-di(hydroxyalkoxy)-coumarins having formula 1 ##STR1## where n' and n" are integers from 1 to 10.
Claim 7
Dependent Claim
10 words
A linear polyester according to claim 4 in which n'=n"=2.
Claim 8
Dependent Claim
30 words
A method of making a polyester according to claim 5, which comprises polycondensing a glycol terephthalate precursor, characterised in that the polycondensation is carried out in the presence of 4-methyl-6,7-dihydroxy-coumarin.
Claim 9
Dependent Claim
10 words
Shaped articles obtained from a polyester according to claim 1.
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) | 1985-08-30 | 1986-03-01 | 1986-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-30 | 1990-03-01 | 1990-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-30 | 1994-03-01 | 1994-08-31 | $7700.00 | Window Closed / Lapsed |