EP0087294A1
Expired / Lapsed
EP
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Radiation stabilization of polymeric material
Assignee: Becton Dickinson and Co
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Filing: 1983-02-18
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Granted: —
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Expires: 2003-02-18
Abstract
Abstract An irradiation sterilizable composition comprises a semi-crystalline polymer having incorporated therein a mobilizing amount of a non-crystalline liquid mobilizing additive which increases the free volume of the polymer and also having incorporated therein a sterically hindered amine or its N-oxide, N-hydroxide or N-nitroxide salt, with the amine nitrogen being contained in a carbon-nitrogen-carbon chain which forms part of a non-aromatic heterocyclic ring and wherein each of the two carbon atoms of the said chain is bonded either to two alkyl groups which are the same or different and each have 1 to 12 carbon atoms or to an alicyclic group containing 4 to 9 carbon atoms.
Inventors
- 👤 Joel L. Williams
- 👤 Terry S. Dunn
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 22:27
CPC Classifications
A; A61; A61L; A61L2/00; A61L2/02; A61L2/08; C; C08; C08K; C08K5/00; C08K5/0008; C08K5/0016; C08K5/16; C08K5/34; C08K5/3412; C08K5/3432; C08K5/3435
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
107 words
An irradiation sterilizable composition comprising a semi-crystalline polymer having incorporated therein a . mobilizing amount of a non-crystalline liquid mobilizing additive which increases the free volume of the polymer and also having incorporated therein a sterically hindered amine or its N-oxide, N-hydroxide or N-nitroxide salt, with the amine nitrogen being contained in a carbon-nitrogen-carbon chain which forms part of a non-aromatic heterocyclic ring and wherein each of the two carbon atoms of the said chain is bonded either to two alkyl groups which are the same or different and each have 1 to 12 carbon atoms or to an alicyclic group containing 4 to 9 carbon atoms.
Claim 2
Dependent Claim
107 words
An irradiation sterilizable composition comprising a semi-crystalline polymer having incorporated therein a . mobilizing amount of a non-crystalline liquid mobilizing additive which increases the free volume of the polymer and also having incorporated therein a sterically hindered amine or its N-oxide, N-hydroxide or N-nitroxide salt, with the amine nitrogen being contained in a carbon-nitrogen-carbon chain which forms part of a non-aromatic heterocyclic ring and wherein each of the two carbon atoms of the said chain is bonded either to two alkyl groups which are the same or different and each have 1 to 12 carbon atoms or to an alicyclic group containing 4 to 9 carbon atoms.
Claim 3
Dependent Claim
16 words
A composition in accordance with claim 1 wherein the hindered amine includes a 6-membered heterocylic ring.
Claim 4
Dependent Claim
17 words
A composition in accordance with claim 1 wherein the alkyl groups contain 1 to 4 carbon atoms.
Claim 5
Dependent Claim
14 words
A composition in accordance with claim 3 wherein the alkyl groups are all methyl.
Claim 6
Dependent Claim
40 words
A composition in accordance with claim 1 wherein the hindered amine is part of a larger molecule and is bonded to a carrier moiety preferably comprising a dicarboxylate carrier, a carrier which includes a triazine ring, or a diketone carrier.
Claim 7
Dependent Claim
31 words
A composition in accordance with any preceding claim wherein the semi-crystalline polymer is a homopolymer of ethylene, propylene, butene-1, or 4-methylpentene-7, or a copolymer of two or more of these monomers.
Claim 8
Dependent Claim
31 words
A composition in accordance with any preceding claim wherein the mobilizing additive has a density of from 0.6 to 1.9 g/cm 3 and a molecular weight of from 100 to 10,000.
Claim 9
Dependent Claim
40 words
A composition in accordance with any preceding claim wherein the mobilizing additive is selected from hydrocarbon oils, vegetable oils, silicon oils, low molecular weight non-crystalline polymer greases, such, as hydrocarbon polymer greases, low molecular weight polyester greases and polyarylether greases.
Claim 10
Dependent Claim
15 words
A composition in accordance with claim 8 wherein the mobilizing additive is a hydrocarbon oil.
Claim 11
Dependent Claim
26 words
A composition in accordance with any preceding claim wherein the mobilizing additive is present in an amount from 0.01% to 50% by weight of the composition.
Claim 12
Dependent Claim
27 words
A composition in accordance with any preceding claim wherein the hindered amine is present at a level of from 0.005 to 0.5% by weight of the composition.
Claim 13
Dependent Claim
25 words
A composition in accordance with any preceding claim wherein the weight ratio of the mobilizing additive to the heterocyclic amine is from 0.5:1 to 20:1.
Claim 14
Dependent Claim
20 words
An aritcle prepared from a composition according to any preceding claim, after the article has been subjected to irradiation sterilization.
References Cited (Backward Citations)
EP0007736A1
Cited
US4274932A
Cited
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