US5041483A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prevention of odor generation during gamma-irradiation of polypropylene fibers
Assignee: FiberVisions Inc
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Filing: 1988-04-04
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Granted: 1991-08-20
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Expires: 2008-04-04
Abstract
Abstract Rosin esters are used to reduce the tendency of shaped articles made from polypropylene, especially fibers, to form malodorous decomposition products upon sterilization by gamma-irradiation. Other stabilizers normally used to prevent discoloration and degradation of polyolefins may also be present. Stabilized fibers are used for the manufacture of disposable medical products.
Inventors
- 👤 George N. B. Burch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:55
CPC Classifications
D; D01; D01F; D01F1/00; D01F1/02; D01F1/10; A; A61; A61L; A61L2/00; A61L2/02; A61L2/08; A61L9/00; C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; D01F6/00; D01F6/02; D01F6/04; D01F6/06; C08L2203/00; C08L2203/12; C08L93/00; C08L93/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
46 words
A method for reducing the tendency of a polypropylene shaped article toward odor generation upon sterilization of the article by gamma-irradiation, comprising incorporating into an article-forming composition from about 0.095 to about 1.0% by weight of a rosin ester as a stabilizer before forming the article.
Claim 2
Independent Claim
46 words
A method for reducing the tendency of a polypropylene shaped article toward odor generation upon sterilization of the article by gamma-irradiation, comprising incorporating into an article-forming composition from about 0.095 to about 1.0% by weight of a rosin ester as a stabilizer before forming the article.
Claim 3
Independent Claim
63 words
A method for reducing the tendency of articles containing polypropylene to generate malodofous decomposition products upon undergoing radiation sterilization, comprising incorporating into a corresponding article-forming composition about 0.095% to about 0.50% by weight of an ester of a monohydric lower alkyl alcohol and a rosin acid, said ester having a Gardner-Holdt viscosity at 25° C. of Y-Z3 and an acid number of 6.
Claim 4
Independent Claim
63 words
A method for reducing the tendency of articles containing polypropylene to generate malodofous decomposition products upon undergoing radiation sterilization, comprising incorporating into a corresponding article-forming composition about 0.095% to about 0.50% by weight of an ester of a monohydric lower alkyl alcohol and a rosin acid, said ester having a Gardner-Holdt viscosity at 25° C. of Y-Z3 and an acid number of 6.
Claim 5
Independent Claim
63 words
A method for reducing the tendency of articles containing polypropylene to generate malodorous decomposition products upon undergoing radiation sterilization, comprising incorporating into a corresponding article-forming composition about 0.095% to about 0.50% by weight of an ester of a monohydric lower alkyl alcohol and a rosin acid, said ester having a Gardner-Holdt viscosity at 25° C. of Z-Z4 and an acid number of 7.
Claim 6
Independent Claim
63 words
A method for reducing the tendency of articles containing polypropylene to generate malodorous decomposition products upon undergoing radiation sterilization, comprising incorporating into a corresponding article-forming composition about 0.095% to about 0.50% by weight of an ester of a monohydric lower alkyl alcohol and a rosin acid, said ester having a Gardner-Holdt viscosity at 25° C. of Z-Z4 and an acid number of 7.
Claim 7
Dependent Claim
18 words
A method according to claim 3 wherein said ester is a methyl ester of a monocarboxy rosin acid.
Claim 8
Dependent Claim
18 words
A method according to claim 2 wherein said ester is a methyl ester of a monocarboxy rosin acid.
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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) | 1994-08-19 | 1995-02-18 | 1995-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-19 | 1999-02-18 | 1999-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-19 | 2003-02-18 | 2003-08-20 | $7700.00 | Window Closed / Lapsed |