US4523008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized unsaturated polyesters
Assignee: National Aeronautics and Space Administration
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Filing: 1984-06-06
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Granted: 1985-06-11
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Expires: 2004-06-06
Abstract
Abstract An unsaturated polyester, such as propylene glycol-maleic acid-phthalic acid prepolymer dissolved in styrene is interpolymerized with an ultraviolet absorber of the formula: <IMAGE> (I) and/or an antioxidant of the formula <IMAGE> (II) where R and R2 are selected from H or lower alkyl such as methyl and R1 is tertiary alkyl such as tertiary butyl to form a polymer stable to exposure to the outdoors without degradation by ultraviolet radiation, thermal and/or photooxidation.
Inventors
- 👤 Otto Vogl
- 👤 Eberhard Borsig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:42
CPC Classifications
C; C08; C08F; C08F299/00; C08F299/02; C08F299/04; C08F299/0478
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
53 words
An unsaturated polyester polymer comprising an unsaturated polyester prepolymer interpolymerized with at least one stabilizer selected from the group consisting of: ##STR6## where R and R 2 are selected from H or alkyl of 1 to 6 carbon atoms and R 1 is a tertiary alkyl group containing 3 to 12 carbon atoms.
Claim 2
Dependent Claim
53 words
An unsaturated polyester polymer comprising an unsaturated polyester prepolymer interpolymerized with at least one stabilizer selected from the group consisting of: ##STR6## where R and R 2 are selected from H or alkyl of 1 to 6 carbon atoms and R 1 is a tertiary alkyl group containing 3 to 12 carbon atoms.
Claim 3
Dependent Claim
25 words
A polyester according to claim 1 in which the unsaturated polyester prepolymer is a copolymer of a diol and an unsaturated dibasic acid or anhydride.
Claim 4
Dependent Claim
18 words
A polyester according to claim 2 in which the prepolymer further contains a saturated or aromatic dibasic acid.
Claim 5
Dependent Claim
21 words
A polyester according to claim 3 in which the polyester is copolymerized with a vinyl monomer in which it is soluble.
Claim 6
Dependent Claim
12 words
A polyester according to claim 4 in which the monomer is styrene.
Claim 7
Dependent Claim
52 words
A polyester according to claim 5 in which the diol is selected from the group consisting of ethylene glycol, propylene glycol, butylene glycol or neopentyl glycol, the unsaturated dibasic acid is selected from the group consisting of maleic or fumaric and the saturated acid is selected from phthalic acid or adipic acid.
Claim 8
Dependent Claim
26 words
A polyester according to claim 6 in which the diol is propylene glycol, the unsaturated acid is maleic acid and the saturated acid is phthalic acid.
Claim 9
Dependent Claim
39 words
A polyester according to claim 1 in which the stabilizer (I) is present in an amount from 0.1 to 10 percent by weight and the stabilizer (II) is present in an amount from 0.05 to 5 percent by weight.
Claim 10
Dependent Claim
25 words
A polyester according to claim 4 in which R and R 2 are selected from H or CH 3 and R 1 is tertiary butyl.
Claim 11
Dependent Claim
13 words
A polyester according to claim 9 containing both stabilizer (I) and stabilizer (II).
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) | 1988-06-10 | 1988-12-10 | 1989-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-10 | 1992-12-10 | 1993-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-10 | 1996-12-10 | 1997-06-11 | $7700.00 | Window Closed / Lapsed |