Patent US2331587A successfully refreshed from Google Patents.
Patent US4284756A successfully refreshed from Google Patents.
US4284756A
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Polyester compositions, shaped articles obtained from them and processes for preparing them
Assignee: Imperial Chemical Industries Ltd
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Filing: 1979-05-29
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Granted: 1981-08-18
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Expires: 1999-05-29
Abstract
Abstract UV stable linear polyesters, e.g. PET, contain in their chain copolymerized bis(hydroxyalkoxy)xanth-9-ones, preferably 3,6-bis-(2-hydroxyethoxy)xanth -9-ones. The polymers are obtained by polymerization in the presence of a tetrahydroxy benzophenone, preferably the 2,2',4,4'- isomer. The method of polymerizing in the presence of dihydric phenols to obtain ethoxyaryloxy polyesters is also described.
Inventors
- 👤 Patrick J. Horner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:40
CPC Classifications
C; C07; C07D; C07D311/00; C07D311/02; C07D311/78; C07D311/80; C07D311/82; C07D311/84; C07D311/86; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/66
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
29 words
A linear polyester which contains polymerized in its molecule polymerized units of bis(hydroxyalkoxy)xanth-9-ones, the amount of said bis(hydroxyalkoxy)xanth-9-ones being 0.05 to 10% by weight based on the total polymer.
Claim 2
Dependent Claim
29 words
A linear polyester which contains polymerized in its molecule polymerized units of bis(hydroxyalkoxy)xanth-9-ones, the amount of said bis(hydroxyalkoxy)xanth-9-ones being 0.05 to 10% by weight based on the total polymer.
Claim 3
Dependent Claim
49 words
A linear polyester according to claim 1, which contains the polymerized units internally in the polymer chain and in which the polyester also contains in its molecule polymerized units of 2,4-dihydroxybenzoic acid, the amount of said polymerized units being 0.05 to 10% by weight based on the total polymer.
Claim 4
Dependent Claim
80 words
A linear polyester which has an IV above 0.50 and which contains in its molecule polymerized units of: (A) Dicarboxylic acids selected from (i) terephthalic acid, (ii) isothphthalic acid, (ii) naphthalene-2,6-dicarboxylic acid, and (iv) bis(carboxyphenoxy)ethane, (B) Glycols with 2 to 10 carbon atoms in the molecule, (C) Bis(hydroxyalkoxy)xanth-9-ones, (D) 2,4-dihydroxybenzoic acid, the amount of (C) being 0.05 to 10% and the amount of (D) being 0 to 10%, both percentages being by weight and based on the amount of (A)+(B)+(C)+(D).
Claim 5
Dependent Claim
80 words
A linear polyester which has an IV above 0.50 and which contains in its molecule polymerized units of: (A) Dicarboxylic acids selected from (i) terephthalic acid, (ii) isothphthalic acid, (ii) naphthalene-2,6-dicarboxylic acid, and (iv) bis(carboxyphenoxy)ethane, (B) Glycols with 2 to 10 carbon atoms in the molecule, (C) Bis(hydroxyalkoxy)xanth-9-ones, (D) 2,4-dihydroxybenzoic acid, the amount of (C) being 0.05 to 10% and the amount of (D) being 0 to 10%, both percentages being by weight and based on the amount of (A)+(B)+(C)+(D).
Claim 6
Dependent Claim
18 words
A linear polyester according to claim 3, in which the mole ratio of (C):(D) is 1:1 to 1:07.
Claim 7
Dependent Claim
50 words
A linear polyester which has as repeating units: --OYO--CO--X--CO-- wherein at least 80 mole % of the X-groups represent p-phenylene and the remainder represent m-phenylene at least 90% of the Y groups represent C 2 H 4 and at least 0.1% of the Y groups represent polymerized units of 3,6-bis(hydroxyethoxy)xanth-9-one.
Claim 8
Dependent Claim
50 words
A linear polyester which has as repeating units: --OYO--CO--X--CO-- wherein at least 80 mole % of the X-groups represent p-phenylene and the remainder represent m-phenylene at least 90% of the Y groups represent C 2 H 4 and at least 0.1% of the Y groups represent polymerized units of 3,6-bis(hydroxyethoxy)xanth-9-one.
Claim 9
Dependent Claim
22 words
A linear polyester according to claim 1 comprising repeating units of the formula: ##STR1## wherein n'=1 to 10 and n"=1 to 10.
Claim 10
Dependent Claim
16 words
A linear polyester according to claim 6 wherein n' and n" are both equal to 2.
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) | 1984-08-17 | 1985-02-16 | 1985-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-17 | 1989-02-16 | 1989-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-17 | 1993-02-16 | 1993-08-18 | $7700.00 | Window Closed / Lapsed |