US3839140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame retardant yarns
Assignee: Imperial Chemical Industries Ltd
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Filing: 1972-02-02
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Granted: 1974-10-01
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Expires: 1992-02-02
Abstract
Abstract Flame-retardant filaments are obtained using additives which normally give rise to discolouration or problems during melt spinning by encapsulating the additive in the form of a core in a sheath/core filament, the sheath of which may be a polyamide or polyester. The additive is preferably dispersed or combined with a matrix comprising polyamide or polyester and is preferably a bromine containing compound such as deca bromodiphenyl or polyhexamethylene 2,5, dibromo terephthalate. The efficiency of the flame-retardancy may be improved by the addition of up to 5 percent by weight of a metal oxide such as antimony trioxide, the weight percentage being based on the metal content of the oxide.
Inventors
- 👤 G Tyler
- 👤 A Mohajer
- 👤 F Bell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:41
CPC Classifications
D; D02; D02G; D02G3/00; D02G3/44; D02G3/443; C; C08; C08K; C08K5/00; C08K5/02; C08K5/03; C08L; C08L67/00; C08L67/02; D01; D01F; D01F1/00; D01F1/02; D01F1/07; D01F8/00; D01F8/04; D01F8/12; D01F8/14; Y; Y10; Y10S; Y10S260/00; Y10S260/24; Y10S428/00; Y10S428/92; Y10S428/921; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2929
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
51 words
A FLAME-RETARDANT CONJUGATE FILAMENT CONSISTING OF AT LEAST TWO COMPONENTS IN A SHEATH/CORE RELATIONSHIP, THE SHEATH COMPONENT COMPRISING A MELT EXTRUDABLE FIBER-FORMING POLYMER AND THE CORE COMPONENT COMPRISING A MELT EXTRUDABLE FIBER-FORMING POLYMER CONTAINING A REACTIVE FLAME-RETARDANT ADJUVANT SELECTED FROM THE GROUP CONSISTING OF: 3,6-DIBROMODURENE BIS(P-BROMOPHENYL) ETHER 4-BROMODIPHENYL 2,7-DIBROMO-9,9-BIS(BETA-CARBOXYETHYL) FLUORENE 2,4,6,2'',4'',6''-HEXABROMODIPHENYL.
Claim 2
Dependent Claim
51 words
A FLAME-RETARDANT CONJUGATE FILAMENT CONSISTING OF AT LEAST TWO COMPONENTS IN A SHEATH/CORE RELATIONSHIP, THE SHEATH COMPONENT COMPRISING A MELT EXTRUDABLE FIBER-FORMING POLYMER AND THE CORE COMPONENT COMPRISING A MELT EXTRUDABLE FIBER-FORMING POLYMER CONTAINING A REACTIVE FLAME-RETARDANT ADJUVANT SELECTED FROM THE GROUP CONSISTING OF: 3,6-DIBROMODURENE BIS(P-BROMOPHENYL) ETHER 4-BROMODIPHENYL 2,7-DIBROMO-9,9-BIS(BETA-CARBOXYETHYL) FLUORENE 2,4,6,2'',4'',6''-HEXABROMODIPHENYL.
Claim 3
Dependent Claim
49 words
A filament according to claim 1, wherein the sheath component is formed from a condensation polymer selected from the group consisting of polyesters and polyamides and the core component formed from a fibre-forming condensation polymer selected from the group consisting of polyamides and polyesters containing a flame-retardant reactive adjuvant.
Claim 4
Dependent Claim
16 words
A filament according to claim 1, wherein at least one of the components contains antimony trioxide.
Claim 5
Dependent Claim
16 words
A filament according to claim 1, wherein at least one of the components contains titanium dioxide.
Claim 6
Dependent Claim
30 words
A filament according to claim 3, wherein the percentage by weight of the metal oxide contained in the filament is in the range 0.5 to 5.0 percent expressed as metal.
Claim 7
Dependent Claim
21 words
A filament accordiNg to claim 1 wherein the core component contains up to 20 percent by weight of the reactive adjuvant.
Claim 8
Dependent Claim
24 words
A filament according to claim 6 wherein the cross-sectional area of the filament occupied by the core component ranges from 5 to 10 percent.
Claim 9
Dependent Claim
64 words
A flame retardant conjugate filament consisting of at least two components in a sheath/core relationship, the sheath component comprising a melt extrudable fiber-forming polymer and the core component comprising a melt extrudable fiber-forming polyester containing a flame-retardant reactive adjuvant which is a polyester derived from a dicarboxylic acid and a glycol, said reactive adjuvant polyester selected from the group consisting of poly(ethylene-2,7-dibromofluorene-9,9-dipropionate) and poly(hexamethylene-2,5-dibromo-terephthalate).
Claim 10
Dependent Claim
64 words
A flame retardant conjugate filament consisting of at least two components in a sheath/core relationship, the sheath component comprising a melt extrudable fiber-forming polymer and the core component comprising a melt extrudable fiber-forming polyester containing a flame-retardant reactive adjuvant which is a polyester derived from a dicarboxylic acid and a glycol, said reactive adjuvant polyester selected from the group consisting of poly(ethylene-2,7-dibromofluorene-9,9-dipropionate) and poly(hexamethylene-2,5-dibromo-terephthalate).
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) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |