US4473677A
Expired / Lapsed
US
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Polyolefinic fibers having improved thermal bonding properties and process for obtaining same
Assignee: Merak SpA
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Filing: 1983-08-08
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Granted: 1984-09-25
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Expires: 2003-08-08
Abstract
Abstract Polyolefinic fibers having improved thermal bonding properties, containing from 0.01 to 5% by weight of dianhydride of the 3, 3', 4, 4' benzophenone tetracarboxylic acid or of an alkyl derivative thereof.
Inventors
- 👤 Antonio Pellegrini
- 👤 Benito Beghelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:16
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/54; D04H1/542; D04H1/544; C; C08; C08K; C08K5/00; C08K5/04; C08K5/09; C08K5/092; D01; D01F; D01F6/00; D01F6/02; D01F6/04; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2927; Y10T442/00; Y10T442/60; Y10T442/681
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
76 words
Polyolefinic fibers with improved thermal bonding properties containing from 0.01 to 5% by weight of dianhydride of the 3, 3', 4, 4' benzophenone tetracarboxylic acid or of an alkyl derivative thereof having general formula: ##STR2## wherein each of R 1 , R 2 , R 3 , R 4 , R 5 and R 6 , which may be the same or different, is hydrogen or an alkyl radical containing from 1 to 3 carbon atoms.
Claim 2
Dependent Claim
76 words
Polyolefinic fibers with improved thermal bonding properties containing from 0.01 to 5% by weight of dianhydride of the 3, 3', 4, 4' benzophenone tetracarboxylic acid or of an alkyl derivative thereof having general formula: ##STR2## wherein each of R 1 , R 2 , R 3 , R 4 , R 5 and R 6 , which may be the same or different, is hydrogen or an alkyl radical containing from 1 to 3 carbon atoms.
Claim 3
Dependent Claim
27 words
Polyolefinic fibers, according to claim 1, wherein the amount of the dianhydride or its alkyl derivative having general formula (1) ranges between 0.05 and 0.5% by weight.
Claim 4
Dependent Claim
27 words
Polyolefinic fibers according to claim 2, wherein the amount of the dianhydride or its alkyl derivative having general formula (1) ranges between 0.05 and 0.2% by weight.
Claim 5
Dependent Claim
24 words
Polyolefinic fibers according to claim 1, wherein the polyolefin is polypropylene, consisting essentially of isotactic macromolecules and obtained by stereospecific polymerization of the propylene.
Claim 6
Dependent Claim
23 words
Polyolefinic fibers, according to claim 1, wherein the polyolefin is an ethylene-propylene copolymer having a content of ethylene not exceeding 10% by weight.
Claim 7
Dependent Claim
52 words
A process for producing the polyolefinic fibers of claim 1, characterized in that it consists in incorporating the dianhydride or an alkyl derivative thereof, having the above reported general formula (1) into the polyolefin, before the extrusion in a mixer, in the spinning extruder or at the end of the olefin polymerization.
References Cited (Backward Citations)
US3201363A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-25 | 1988-03-26 | 1988-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-25 | 1992-03-26 | 1992-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-25 | 1996-03-26 | 1996-09-25 | $7700.00 | Window Closed / Lapsed |