US4959402A
Expired / Lapsed
US
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High clarity radiation stable polymeric compostion and articles therefrom
Assignee: Becton Dickinson and Co
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Filing: 1989-06-08
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Granted: 1990-09-25
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Expires: 2009-06-08
Abstract
Abstract A high clarity polymeric composition which is stable toward sterilizing radiation includes a semicrystalline polyolefin of narrow molecular weight distribution having incorporated therein a liquid mobilizing additive, a radiation stabilizing amount of a hindered amine and a clarifying agent. The invention includes a sterilized article fabricated from the composition and a method to radiation sterilize the article.
Inventors
- 👤 Joel L. Williams
- 👤 George R. Titus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:31
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/15; C08K5/156; C08K5/1575; C08L; C08L23/00; C08L23/02; C08L23/10; A; A61; A61L; A61L2/00; A61L2/02; A61L2/08; A61L29/00; A61L29/04; A61L29/041; A61L29/14; C08K5/16; C08K5/34; C08K5/3412; C08K5/3432; C08K5/3435; C08L23/12; C08L91/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
82 words
A composition comprising a polyolefin having a crystalline content of about 20 to 90 percent and a weight distribution wherein the ratio of the weight average molecular weight to the number average molecular weight is no greater than 6, a mobilizing amount of a liquid mobilizer compatible with said polyolefin having a density of about 0.6 to 1.9 grams per cubic centimeter, a radiation stabilizing amount of a hindered piperidine stabilizer and a clarifying amount of a dibenzylidene sorbitol alkyl thioether clarifier.
Claim 2
Dependent Claim
82 words
A composition comprising a polyolefin having a crystalline content of about 20 to 90 percent and a weight distribution wherein the ratio of the weight average molecular weight to the number average molecular weight is no greater than 6, a mobilizing amount of a liquid mobilizer compatible with said polyolefin having a density of about 0.6 to 1.9 grams per cubic centimeter, a radiation stabilizing amount of a hindered piperidine stabilizer and a clarifying amount of a dibenzylidene sorbitol alkyl thioether clarifier.
Claim 3
Dependent Claim
15 words
The composition of claim 1 further comprising about 0.1 to 10% of an additional polymer.
Claim 4
Dependent Claim
22 words
The composition of claim 1 wherein said polyolefin is selected from the group consisting of polyethylene, polypropylene, polymethylpentene, polytetrafluoroethylene and copolymers thereof.
Claim 5
Dependent Claim
28 words
The composition of claim 1 wherein said mobilizing additive is selected from the group consisting of a hydrocarbon oil phthalic ester, polymer grease, vegetable oil and silicone oil.
Claim 6
Dependent Claim
16 words
The composition of claim 1 wherein said stabilizer is a bis(4-piperidinyl) diester of a dicarboxylic acid.
Claim 7
Dependent Claim
71 words
A composition comprising a semicrystalline polyolefin having a weight distribution wherein the ratio of the weight average molecular weight to the number average molecular weight is no greater than 9.0, a mobilizing amount of a noncrystalline mobilizing additive which is compatible with said polyolefin, and which increases the free voluem of said polyolefin, a radiation stabilizing amount of a hindered amine stabilizer and a clarifying amount of thioether dibenzylidene sorbitol clarifer.
Claim 8
Dependent Claim
71 words
A composition comprising a semicrystalline polyolefin having a weight distribution wherein the ratio of the weight average molecular weight to the number average molecular weight is no greater than 9.0, a mobilizing amount of a noncrystalline mobilizing additive which is compatible with said polyolefin, and which increases the free voluem of said polyolefin, a radiation stabilizing amount of a hindered amine stabilizer and a clarifying amount of thioether dibenzylidene sorbitol clarifer.
Claim 9
Dependent Claim
81 words
A composition comprising polypropylene having a crystalline content of 30 to 70 percent and a weight distribution wherein the ratio of the weight average molecular weight to the number average molecular weight is about 2 to 4, a mobilizing amount of a substantially nonviscous liquid mobilizer selected from the group consisting of a hydrocarbon oil and a phthalic ester oil, a radiation stabilizing amount of a hindered bis(4-piperidinyl) diester of a dicarboxylic acid stabilizer, and a clarifying amount of 4,4'-bis(methylthio)dibenzylidene sorbitol.
Claim 10
Dependent Claim
81 words
A composition comprising polypropylene having a crystalline content of 30 to 70 percent and a weight distribution wherein the ratio of the weight average molecular weight to the number average molecular weight is about 2 to 4, a mobilizing amount of a substantially nonviscous liquid mobilizer selected from the group consisting of a hydrocarbon oil and a phthalic ester oil, a radiation stabilizing amount of a hindered bis(4-piperidinyl) diester of a dicarboxylic acid stabilizer, and a clarifying amount of 4,4'-bis(methylthio)dibenzylidene sorbitol.
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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) | 1993-09-24 | 1994-03-26 | 1994-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-24 | 1998-03-26 | 1998-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-24 | 2002-03-26 | 2002-09-25 | $7700.00 | Window Closed / Lapsed |