Patent US3909489A successfully refreshed from Google Patents.
US3909489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyesters and copolyesters having improved flame retardancy
Assignee: Shell USA Inc
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Filing: 1973-11-07
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Granted: 1975-09-30
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Expires: 1993-11-07
Abstract
Abstract Polyesters and copolyesters, derived from the reaction of a dicarboxylic acid or lower alkyl ester thereof with a glycol, which possess improved flame retardant properties as a result of the addition to said polyesters and copolyesters of a synergistic mixture consisting of (1) from 1 to 10 percent by weight of a polyhalogenated aromatic compound selected from the group consisting of halogenated benzene, biphenyl and naphthalene compounds and (2) from 0.1 to 3.0 percent by weight of at least one alkali metal tetrafluoroborate.
Inventors
- 👤 Douglas D Callander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:20
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/38; C08K5/00; C08K5/02; C08K5/03; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921; Y10T; Y10T428/00; Y10T428/23907; Y10T428/23993
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
116 words
In the preparation of flame retardant high molecular weight linear polyester and copolyester resins prepared by the reaction of at least one dicarboxylic acid selected from the group consisting of aliphatic and aromatic dicarboxylic acids or the lower alkyl esters thereof with at least one glycol of the formula HO(CH2)nOH where n is an integer ranging from 2 to 10 the improvement which comprises adding to said polyester and copolyester a flame retardant synergistic mixture consisting of (1) from 1 to 10 percent by weight, based on the weight of the polyester or copolyester, of halogen atom as at least one polyhalogenated aromatic compound selected from the group consisting of; halogenated benzene compounds of the formula
Claim 2
Dependent Claim
116 words
In the preparation of flame retardant high molecular weight linear polyester and copolyester resins prepared by the reaction of at least one dicarboxylic acid selected from the group consisting of aliphatic and aromatic dicarboxylic acids or the lower alkyl esters thereof with at least one glycol of the formula HO(CH2)nOH where n is an integer ranging from 2 to 10 the improvement which comprises adding to said polyester and copolyester a flame retardant synergistic mixture consisting of (1) from 1 to 10 percent by weight, based on the weight of the polyester or copolyester, of halogen atom as at least one polyhalogenated aromatic compound selected from the group consisting of; halogenated benzene compounds of the formula
Claim 3
Dependent Claim
60 words
The improvement of claim 1 wherein the synergistic mixture consists of (1) from 3 to 6 percent by weight, based on the weight of the polyester or copolyester, of halogen atom as at least one polyhalogenated aromatic compound and (2) from 0.25 to 2.0 percent by weight, based on the polyester or copolyester, of at least one alkali metal tetrafluoroborate.
Claim 4
Dependent Claim
12 words
The improvement of claim 1 wherein the halogen atom is bromine atom.
Claim 5
Dependent Claim
31 words
The improvement of claim 1 wherein the halogen atom is bromine atom as octabromobiphenyl and the alkali metal tetrafluoroborate is selected from the group consisting of sodium tetrafluoroborate and potassium tetrafluoroborate.
Claim 6
Dependent Claim
86 words
A FLAME RETARDANT, HIGH MOLECULAR WEIGHT LINEAR POLYESTER OR COPOLYESTER COMPOSITION CONSISTING OF (A) A POLYESTER OR COPOLYSTER HAVING AN INTRINSIC VISCOSITY OF AT LEAST 0.4 AS MEASURED ON A 0.1 GRAM SAMPLE AT 30*C. IN A 60/40 PHENOL/STETRACHLOROTHANE SOLVENT AND (B) A SYNERGISTIC MIXTURE CONSISTING OF (1) FROM 1 TO 10 PERCENT BY WEIGHT, BASED ON THE WEIGHT OF THE POLYESTER OR COPOLYESTER, OF HALOGEN ATOM AS AT LEAST ONE POLYHALOGENATED AROMATIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF HALOGENATED BENZENE COMPOUNDS OF THE FORMULA
Claim 7
Dependent Claim
86 words
A FLAME RETARDANT, HIGH MOLECULAR WEIGHT LINEAR POLYESTER OR COPOLYESTER COMPOSITION CONSISTING OF (A) A POLYESTER OR COPOLYSTER HAVING AN INTRINSIC VISCOSITY OF AT LEAST 0.4 AS MEASURED ON A 0.1 GRAM SAMPLE AT 30*C. IN A 60/40 PHENOL/STETRACHLOROTHANE SOLVENT AND (B) A SYNERGISTIC MIXTURE CONSISTING OF (1) FROM 1 TO 10 PERCENT BY WEIGHT, BASED ON THE WEIGHT OF THE POLYESTER OR COPOLYESTER, OF HALOGEN ATOM AS AT LEAST ONE POLYHALOGENATED AROMATIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF HALOGENATED BENZENE COMPOUNDS OF THE FORMULA
Claim 8
Dependent Claim
61 words
The composition of claim 5 wherein the polyester is polyethylene terephthalate and the synergistic mixture consists of from 1 to 10 percent by weight of bromine atom as octabromobiphenyl and from 0.1 to 3.0 percent by weight of an alkali metal tetrafluoroborate selected from the group consisting of sodium tetrafluoroborate and potassium tetrafluoroborate, all based on the weight of the polyester.
Claim 9
Dependent Claim
11 words
The composition of claim 5 in the form of a filament.
Claim 10
Dependent Claim
11 words
The composition of claim 5 in the form of a fiber.
Claim 11
Dependent Claim
11 words
The composition of claim 5 in the form of a film.
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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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |