US4643946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filler-containing acrylic and modacrylic fibres and a process for the production thereof
Assignee: BAER AKTIENGESELLSCHAFT A CORP OF GERMANY
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Filing: 1985-11-12
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Granted: 1987-02-17
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Expires: 2005-11-12
Abstract
Abstract Silica-containing acrylic and modacrylic fibres are obtained without spinning defects in that an aqueous silica sol is reacted with a silane and with a polar organic solvent, the sequence in which the two agents are added being optional, the water is distilled off in a vacuum at a temperature of at most 60° C., the thread-forming polymer is then added in a quantity which is sufficient to form a spinnable solution and the solution is spun.
Inventors
- 👤 Wolfgang Brauer
- 👤 Bernd Willenberg
- 👤 Siegfried Korte
- 👤 Carlhans Suling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:22
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/44; D01F6/54; D01F1/00; D01F1/02; D01F1/07; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2904; Y10T428/2913; Y10T428/2927; Y10T428/2933; Y10T428/2962; Y10T428/2964; Y10T428/2967; Y10T428/2973; Y10T428/2978; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
64 words
Acrylic and modacrylic fibers containing from 5 to 50% by weight, based on total solids of silica, wherein said silica is the reaction product of a silica sol and from 0.1 to 10% by weight, based on pure silica, of an organosilane, the silica being an amorphous silica which does not tend to aggregate and has a particle diameter distribution of from 10-50 nm.
Claim 2
Dependent Claim
64 words
Acrylic and modacrylic fibers containing from 5 to 50% by weight, based on total solids of silica, wherein said silica is the reaction product of a silica sol and from 0.1 to 10% by weight, based on pure silica, of an organosilane, the silica being an amorphous silica which does not tend to aggregate and has a particle diameter distribution of from 10-50 nm.
Claim 3
Dependent Claim
59 words
Acrylic and modacrylic fibres according to claim 1, wherein the organosilane corresponds to one of the formulae ##STR2## wherein R 1 represents hydrogen or methyl R 2 represents straight chained or branched C 1 -C 4 -alkyl or phenyl R 3 represents OR 2 or R 2 and A represents straight chained or branched C 1 -C 6 alkylene.
Claim 4
Dependent Claim
27 words
Acrylic and modacrylic fibres according to claim 1, wherein the silica particles additionally contain from 0.1 to 10% by weight based on pure silica, of surface-fixed polymer.
Claim 5
Dependent Claim
19 words
Acrylic fibres according to claim 1 wherein the acrylonitrile polymer is an acrylonitrile homopolymer having a K-value above 70.
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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) | 1990-02-16 | 1990-08-18 | 1991-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-16 | 1994-08-18 | 1995-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-16 | 1998-08-18 | 1999-02-17 | $7700.00 | Window Closed / Lapsed |