US4645825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fibres and filaments of polyarylene sulphides
Assignee: Bayer AG
•
Filing: 1985-08-01
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Granted: 1987-02-24
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Expires: 2005-08-01
Abstract
Abstract The invention relates to fibres and filaments of special new polyarylene sulphides.
Inventors
- 👤 Karsten Idel
- 👤 Bernd Willenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:25
CPC Classifications
C; C08; C08L; C08L81/00; C08L81/02; C08G; C08G75/00; C08G75/02; C08G75/0204; C08G75/0231; C08G75/025; C08G75/0254
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
48 words
A fibre or filament of a polyarylene sulphide, characterised in that the polyarylene sulphide has a melt viscosity, η m , of 20 to 500,000 Pa.s and a weight average of the relative molecular weight M w (rel) of 25,000 to 500,000 wherein: lg η.sub.m =3.48×lg M.sub.w (rel)-14.25±0.1.
Claim 2
Dependent Claim
48 words
A fibre or filament of a polyarylene sulphide, characterised in that the polyarylene sulphide has a melt viscosity, η m , of 20 to 500,000 Pa.s and a weight average of the relative molecular weight M w (rel) of 25,000 to 500,000 wherein: lg η.sub.m =3.48×lg M.sub.w (rel)-14.25±0.1.
Claim 3
Dependent Claim
14 words
A fibre or filament according to claim 1, wherein: lg η.sub.m =3.48×lg M.sub.w (rel)-14.25±0.05.
Claim 4
Dependent Claim
20 words
A fibre or filament according to claim 1, characterised in that the polyarylene sulphide is produced in an N-alkyl lactam.
Claim 5
Dependent Claim
18 words
A fibre or filament according to claim 1, characterised in that the polyarylene sulphide is produced in N-methylcaprolactam.
Claim 6
Dependent Claim
23 words
A fibre or filament according to claim 1, characterised in that p-dichlorobenzene, p-dibromobenzene or 4,4'-dichlorodiphenylsulphone is used for production of the polyarylene sulphide.
Claim 7
Dependent Claim
31 words
A fibre or filament according to claim 1, characterised in that water is completely removed from reactants used to prepare the fibres or filaments or in that the reactants are anhydrous.
Claim 8
Dependent Claim
26 words
A fibre or filament according to claim 1, characterised in that production is controlled by metered introduction of reactants used to produce the fibres or filaments.
Claim 9
Dependent Claim
27 words
A fibre or filament according to claim 1, characterised in that the fibres or filaments are first drawn and then are subjected to a heat setting process.
Claim 10
Dependent Claim
38 words
A fibre or filament according to claim 1, characterised in that the total fibre or filament elongation under a creep test under a load of 0.1 cN/dtex at 240° C. is not more than 2% after 1 h.
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) | 1990-02-23 | 1990-08-25 | 1991-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-23 | 1994-08-25 | 1995-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-23 | 1998-08-25 | 1999-02-24 | $7700.00 | Window Closed / Lapsed |