US5039748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-strength polypropylene fiber
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1990-05-17
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Granted: 1991-08-13
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Expires: 2010-05-17
Abstract
Abstract High-Strength polypropylene fiber is obtained from polypropylene having incorporated therein from 0.05 to 10,000 ppm by weight of a vinylcycloalkane polymer. The disclosed fiber polypropylene has an intrinsic viscosity of from 0.5 to 2.5 dl/g as measured in a tetralin solution at 135° C. and a ratio of weight average molecular weight to number average molecular weight of not more than 3.5/1.
Inventors
- 👤 Kizuku Wakatsuki
- 👤 Noboru Yamaguchi
- 👤 Kazuki Wakamatsu
- 👤 Masahiro Kakugo
- 👤 Tadayuki Ohmae
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:58
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12; D; D01; D01F; D01F6/00; D01F6/02; D01F6/04; D01F6/06; C08L2203/00; C08L2203/12; C08L23/18; C08L23/20; C08L2314/00; C08L2314/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
59 words
High-strength polypropylene fiber obtained from polypropylene having incorporated therein from 0.05 to 10,000 ppm by weight of a vinylcycloalkane polymer, said polypropylene having an intrinsic viscosity of from 0.5 to 2.5 dl/g as measured in a tetralin solution at 135° C. and a ratio of weight average molecular weight to number average molecular weight of not more than 3.5/1.
Claim 2
Dependent Claim
59 words
High-strength polypropylene fiber obtained from polypropylene having incorporated therein from 0.05 to 10,000 ppm by weight of a vinylcycloalkane polymer, said polypropylene having an intrinsic viscosity of from 0.5 to 2.5 dl/g as measured in a tetralin solution at 135° C. and a ratio of weight average molecular weight to number average molecular weight of not more than 3.5/1.
Claim 3
Dependent Claim
72 words
High-strength polypropylene fiber as claimed in claim 1, wherein said polypropylene is polypropylene prepared by degrading a propylene homopolymer or a copolymer comprising propylene and up to 5 mol % of other α-olefins, each having an intrinsitc viscosity of from 1.1 to 3.5 dl/g as measured in a tetralin solution at 135° C., with an organic peroxide or by heating so as to have its intrinsic viscosity reduced to 1/5 to 7/10.
Claim 4
Dependent Claim
29 words
High-strength polypropylene fiber as claimed in claim 1, wherein said polypropylene is a propylene homopolymer or a copolymer comprising propylene and up to 5 mol % of other α-olefins.
Claim 5
Dependent Claim
40 words
High-strength polypropylene fiber as claimed in claim 1, wherein said vinylcycloalkane polymer is a vinylcycloalkane homopolymer, a copolymer comprising different kinds of vinylcycloalkanes, or a copolymer comprising a vinylkcycloalkane and up to 20 mol % of α-olefin or styrene monomers.
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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) | 1994-08-12 | 1995-02-11 | 1995-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-12 | 1999-02-11 | 1999-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-12 | 2003-02-11 | 2003-08-13 | $7700.00 | Window Closed / Lapsed |