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US4710524A
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High energy radiation stabilization of semi-crystalline polymers
Assignee: Becton Dickinson and Co
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Filing: 1985-08-05
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Granted: 1987-12-01
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Expires: 2005-08-05
Abstract
Abstract A radiation stabilized and sterilized, flexible article is comprised of a semi-crystalline polymer having a crystalline content of from twenty percent to ninety percent. This polymer has been irradiated with a sterilizing amount of high energy radiation while having incorporated therein radiation stabilizing amounts of a hindered piperidine compound a benzophenone precursor sufficient to render the article substantially resistant to radiolysis while retaining its flexibility. A method for sterilizing and radiation stabilizing a semi-crystalline polymer is also part of the present invention.
Inventors
- 👤 John Donohue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:15
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/13; C08K5/132; A; A61; A61L; A61L2/00; A61L2/02; A61L2/08; C08K5/16; C08K5/34; C08K5/3412; C08K5/3432; C08K5/3435
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
67 words
A radiation stabilized and sterilized, flexible article comprising: a polyolefin having a crystalline content of from twenty percent to ninety percent; 0.01 percent to 5.0 percent by weight of a hindered piperidine stabilizer; and 0.01 percent to 5.0 percent by weight of resorcinol monobenzoate, said article having been irradiated with a sterilizing amount of high energy radiation and being substantially resistant to radiolysis while retaining its flexibility.
Claim 2
Dependent Claim
67 words
A radiation stabilized and sterilized, flexible article comprising: a polyolefin having a crystalline content of from twenty percent to ninety percent; 0.01 percent to 5.0 percent by weight of a hindered piperidine stabilizer; and 0.01 percent to 5.0 percent by weight of resorcinol monobenzoate, said article having been irradiated with a sterilizing amount of high energy radiation and being substantially resistant to radiolysis while retaining its flexibility.
Claim 3
Dependent Claim
16 words
The article of claim 1 wherein said stabilizer is a hindered bis(4-piperidinyl)diester of a dicarboxylic acid.
Claim 4
Dependent Claim
10 words
The article of claim 2 wherein said stabilizer is bis(2,2,6,6-tetramethyl-4-piperidinyl)sebacate.
Claim 5
Dependent Claim
11 words
The article of claim 2 wherein said stabilizer is bis(1,2,2,6,6-pentamethyl-4-piperidinyl) 2-n-butyl-2-(3,5-di-tert-butyl-4-hydroxybenzyl)malonate.
Claim 6
Dependent Claim
10 words
The article of claim 2 wherein said stabilizer is bis(1,2,2,6,6-pentamethyl-4-piperidinyl)sebacate.
Claim 7
Dependent Claim
11 words
The article of claim 1 which further includes an internal lubricant.
Claim 8
Dependent Claim
12 words
The article of claim 6 wherein said lubricant is a metal stearate.
Claim 9
Dependent Claim
11 words
The article of claim 1 in the form of a syringe.
Claim 10
Dependent Claim
12 words
The article of claim 1 in the form of a package film.
Claim 11
Dependent Claim
58 words
A radiation stabilized and sterilized article comprising: a semi-crystalline polymer having a crystalline content of from twenty percent to ninety percent, said polymer having been irradiated with a sterilizing amount of high energy radiation while having incorporated therein radiation stabilizing amounts of a hindered piperidine compound and resorcinol monobenzoate sufficient to render said article substantially resistant to radiolysis.
Claim 12
Dependent Claim
58 words
A radiation stabilized and sterilized article comprising: a semi-crystalline polymer having a crystalline content of from twenty percent to ninety percent, said polymer having been irradiated with a sterilizing amount of high energy radiation while having incorporated therein radiation stabilizing amounts of a hindered piperidine compound and resorcinol monobenzoate sufficient to render said article substantially resistant to radiolysis.
Claim 13
Dependent Claim
70 words
A radiation stabilized and sterilized, flexible article comprising: a polyolefin having a crystalline content of from twenty percent to ninety percent; 0.01 percent to 5.0 percent by weight of a hindered bis(4-piperidinyl)diester of a dicarboxylic acid; and 0.01 percent to 5.0 percent by weight of resorcinol monobenzoate, said article having been irradiated with a sterilizing amount of high energy radiation and being substantially resistant to radiolysis while retaining its flexibility.
Claim 14
Dependent Claim
70 words
A radiation stabilized and sterilized, flexible article comprising: a polyolefin having a crystalline content of from twenty percent to ninety percent; 0.01 percent to 5.0 percent by weight of a hindered bis(4-piperidinyl)diester of a dicarboxylic acid; and 0.01 percent to 5.0 percent by weight of resorcinol monobenzoate, said article having been irradiated with a sterilizing amount of high energy radiation and being substantially resistant to radiolysis while retaining its flexibility.
Claim 15
Independent Claim
76 words
A method for sterilizing and radiation stabilizing a polyolefin comprising: subjecting a polyolefin to a sterilizing amount of high energy radiation, said polyolefin having a crystalline content of from twenty percent to ninety percent and having incorporated therein 0.01 percent to 5.0 percent by weight of a hindered piperidine stabilizer and 0.01 percent to 5.0 percent by weight of resorcinol monobenzoate to thereby produce a polyolefin which is substantially resistant to radiolysis while retaining its flexibility.
Claim 16
Independent Claim
76 words
A method for sterilizing and radiation stabilizing a polyolefin comprising: subjecting a polyolefin to a sterilizing amount of high energy radiation, said polyolefin having a crystalline content of from twenty percent to ninety percent and having incorporated therein 0.01 percent to 5.0 percent by weight of a hindered piperidine stabilizer and 0.01 percent to 5.0 percent by weight of resorcinol monobenzoate to thereby produce a polyolefin which is substantially resistant to radiolysis while retaining its flexibility.
Claim 17
Dependent Claim
18 words
The method in accordance with claim 12 wherein said stabilizer is a hindered bis(4-piperidinyl)diester of a dicarboxylic acid.
Claim 18
Dependent Claim
15 words
The method of claim 12 wherein said polyolefin is in the form of an article.
Claim 19
Dependent Claim
20 words
The method of claim 12 wherein said polyolefin is subjected to high energy radiation ranging between 0.5 and 6 megarads.
Claim 20
Dependent Claim
11 words
The method of claim 13 wherein said stabilizer is bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate.
Claim 21
Dependent Claim
10 words
The method of claim 13 wherein the stabilizer is bis(1,2,2,6,6-pentamethyl-4-piperidinyl)-2-n-butyl-2-(3,5-di-tert-butyl-4-hydroxybenzyl)malonate.
Claim 22
Dependent Claim
10 words
The method of claim 13 wherein the stabilizer is bis(1,2,2,6,6-pentamethyl-4-piperidinyl)sebacate.
Claim 23
Dependent Claim
14 words
The method of claim 12 which further includes the addition of an internal lubricant.
Claim 24
Independent Claim
60 words
A method for rendering semi-crystalline polymers radiation sterilizable comprising: subjecting to a sterilizing amount of high energy radiation a semi-crystalline polymer having a crystalline content of from twenty percent to ninety percent and having incorporated therein radiation stabilizing amounts of a hindered piperidine compound and resorcinol monobenzoate sufficient to render said polymer substantially resistant to radiolysis and post-irradiative oxidative degradation.
Claim 25
Independent Claim
60 words
A method for rendering semi-crystalline polymers radiation sterilizable comprising: subjecting to a sterilizing amount of high energy radiation a semi-crystalline polymer having a crystalline content of from twenty percent to ninety percent and having incorporated therein radiation stabilizing amounts of a hindered piperidine compound and resorcinol monobenzoate sufficient to render said polymer substantially resistant to radiolysis and post-irradiative oxidative degradation.
Claim 26
Independent Claim
78 words
A method for sterilizing and radiation stabilizing a polyolefin comprising: subjecting a polyolefin to a sterilizing amount of high energy radiation, said polyolefin having a crystalline content of from twenty percent to ninety percent and having incorporated therein 0.01 percent to 5.0 percent by weight of a hindered bis(4-piperidinyl)diester of dicarboxylic acid and 0.01 percent to 5.0 percent by weight of resorcinol monobenzoate to thereby produce a polyolefin which is substantially resistant to radiolysis while retaining its flexibility.
Claim 27
Independent Claim
78 words
A method for sterilizing and radiation stabilizing a polyolefin comprising: subjecting a polyolefin to a sterilizing amount of high energy radiation, said polyolefin having a crystalline content of from twenty percent to ninety percent and having incorporated therein 0.01 percent to 5.0 percent by weight of a hindered bis(4-piperidinyl)diester of dicarboxylic acid and 0.01 percent to 5.0 percent by weight of resorcinol monobenzoate to thereby produce a polyolefin which is substantially resistant to radiolysis while retaining its flexibility.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1990-11-30 | 1991-06-01 | 1991-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-30 | 1995-06-01 | 1995-12-01 | $3760.00 | Window Closed / Lapsed |
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