US4043981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolyesters derived from ethoxylated 3,5-dibromo-4-hydroxybenzoic acid
Assignee: Henkel Corp
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Filing: 1976-02-06
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Granted: 1977-08-23
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Expires: 1996-02-06
Abstract
Abstract Flame retardant high molecular weight linear copolyesters capable of being formed into fibers and filaments and which exhibit a high degree of thermal and ultraviolet stability are obtained using ethoxylated 3,5-dibromo-4-hydroxybenzoic acid.
Inventors
- 👤 William L. O'Brien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:52
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/682; C08G63/6822
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
84 words
A flame retardant copolyester having improved thermal and ultraviolet stability comprising the condensation product of a. an aliphatic or alicyclic diol having from 2 to 10 carbon atoms, b. an aliphatic, alicyclic or aromatic dicarboxylic acid having from 4 to 12 carbon atoms or lower allkyl esters thereof, and c. ethoxylated brominated hydroxybenzoic acid of the formula ##STR5## where n amd m are integers from 1 to 3, said ethoxylated brominated hydroxybenzoic acid comprising about 1 to 30% by weight of the copolyester composition.
Claim 2
Dependent Claim
84 words
A flame retardant copolyester having improved thermal and ultraviolet stability comprising the condensation product of a. an aliphatic or alicyclic diol having from 2 to 10 carbon atoms, b. an aliphatic, alicyclic or aromatic dicarboxylic acid having from 4 to 12 carbon atoms or lower allkyl esters thereof, and c. ethoxylated brominated hydroxybenzoic acid of the formula ##STR5## where n amd m are integers from 1 to 3, said ethoxylated brominated hydroxybenzoic acid comprising about 1 to 30% by weight of the copolyester composition.
Claim 3
Dependent Claim
22 words
The copolyester of claim 1 further characterized as a high molecular weight crystalline linear polymer having an inherent viscosity greater than 0.4.
Claim 4
Dependent Claim
18 words
The copolyester of claim 1 wherein (c) is diethoxylated 3,5-dibromo- 4-hydroxybenzoic acid having n = m = 1.
Claim 5
Dependent Claim
24 words
The copolyester of claim 3 wherein (b) is terephthalic acid or dimethylterephthalate and (c) constitutes 10 to 25% by weight of the copolyester composition.
Claim 6
Dependent Claim
10 words
The copolyester of claim 4 wherein (a) is ethylene glycol.
Claim 7
Dependent Claim
9 words
The copolyester of claim 4 wherein (a) is 1,4-butanediol.
Claim 8
Dependent Claim
9 words
The copolyester of claim 4 wherein (a) is 1,4-cyclohexanedimethanol.
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) | 1980-08-22 | 1981-02-21 | 1981-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-22 | 1985-02-21 | 1985-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-22 | 1989-02-21 | 1989-08-23 | $7700.00 | Window Closed / Lapsed |